19 research outputs found
ANALISIS BIAYA MUTU ALAS KAKI MODEL BS-12 DI CV.XYZ
No full textCV.XYZ is a company that produces footwear. From December 2022 – February 2023, the BS-12 footwear model experienced many product rejects. The high percentage of rejected products raises quality costs for rework activities. Identification of the type of rejection and the rework process is needed to determine the rework costs incurred by the company. Analysis of quality costs due to the rework process was carried out using the Process Costing method while identifying the factors causing the occurrence of rejected products using Why-why Analysis. The results of the analysis showed that there were 6 types of damage, namely straps (mouldy, abrasions, broken seams), insole (mouldy, abrasions, broken seams), excess glue, less sticky insole and outsole, loose straps & slippery sole. The quality costs incurred by the company during December 2022 – February 2023 amount to IDR 16,250,104. Products were rejected for multiple reasons, including inadequate facilities and equipment, operators working from home, and a staff shortage to meet production demands. Proposed improvements using 5W+1H included rearranging the production layout for strap storage, making SOP and WI for operators who work at home, buying press machines, and increasing the number of operators.CV.XYZ merupakan perusahaan yang memproduksi alas kaki. Selama bulan Desember 2022 – Februari 2023, alas kaki model BS-12 mengalami banyak produk reject. Tingginya persentase produk reject menimbulkan biaya mutu untuk kegiatan rework. Identifikasi jenis cacat dan proses rework diperlukan untuk mengetahui biaya rework yang dikeluarkan oleh perusahaan. Analisis biaya mutu akibat proses rework dilakukan dengan metode Process Costing sedangkan identifikasi faktor penyebab terjadinya produk reject dilakukan dengan Why-why Analysis. Hasil analisis menunjukan terdapat 6 jenis kerusakan yaitu strap (jamur, lecet, jahitan rusak), insole (jamur, lecet, jahitan rusak), kelebihan lem, insole dan outsole kurang menempel, strap longgar & sole licin. Biaya mutu yang dikeluarkan oleh perusahaan selama bulan Desember 2022 – Februari 2023 sebesar Rp 16.250.104. Faktor penyebab produk reject adalah tidak adanya fasilitas untuk menampung output produksi, operator melakukan proses insole di rumah, perusahaan tidak memiliki mesin press pada proses assembly insole dan outsole, dan jumlah operator tidak sesuai dengan jumlah produksi. Usulan perbaikan dengan menggunakan 5W+1H berupa menata ulang lantai produksi untuk penyimpanan strap, membuat SOP dan IK untuk operator yang bekerja di rumah, membeli mesin press, dan menambah jumlah operator
English: English
No full textSustainable waste management and environmentally friendly production systems have become central to modern supply chain practices. Refuse-derived fuel, an alternative fuel derived from solid waste, presents significant potential in supporting green supply chain management principles. However, its integration into the green supply chain management framework remains fragmented. This study aims to explore the integration of refuse-derived fuel into sustainable supply chain management using an integrative literature review method. Findings indicate that refuse-derived fuel contributes not only to reducing landfill volume and emissions but also enhances energy efficiency, particularly in the cement manufacturing industry. Key challenges include feedstock quality, technological complexity, and limited policy support. This study proposes a conceptual model positioning refuse-derived fuel as a strategic driver for green production. Through a multidisciplinary understanding of refuse-derived fuel, waste management, and supply chain innovation, refuse-derived fuel emerges as a promising component for systematic integration into sustainable production and circular economy strategies. Future research is recommended to validate this conceptual model empirically and to explore practical implementation pathways in various industrial sectors.Pengelolaan limbah yang berkelanjutan dan sistem produksi ramah lingkungan menjadi fokus utama dalampraktik rantai pasok modern. Refuse-Derived Fuel (RDF) sebagai bahan bakar alternatif yang berasal darilimbah padat menunjukkan potensi besar dalam mendukung prinsip Green Supply Chain Management(GSCM). Namun, integrasi RDF dalam kerangka GSCM masih belum banyak dibahas secara menyeluruh.Penelitian ini bertujuan untuk mengkaji integrasi RDF dalam Sustainable Supply Chain Management(GSCM) melalui metode tinjauan literatur integratif. Hasil kajian menunjukkan bahwa RDF tidak hanyaberkontribusi terhadap pengurangan volume limbah dan emisi, tetapi juga dapat meningkatkan efisiensienergi dalam industri, terutama sektor manufaktur semen. Tantangan utama mencakup kualitas bahan bakulimbah, kompleksitas teknologi, serta kebijakan pendukung yang masih terbatas. Studi ini menawarkanmodel konseptual yang memosisikan RDF sebagai penggerak strategis dalam produksi hijau. Denganpemahaman lintas bidang mengenai RDF, manajemen limbah, dan inovasi rantai pasok, RDF berpeluangbesar untuk diintegrasikan secara sistematis dalam strategi produksi berkelanjutan dan ekonomi sirkular
Promoting and protecting mental health of people living with adventitious blindness and low vision : a scoping review of protective and risk factors
No full textOchea Ikpa: Supported with proofreading drafts of the paper. Melanie Bickerton: Supported the team to develop and refine the search strategy. Dr Oghenebrume Wariri: Offered guidance to the corresponding author from the inception through to completion of this review. Clare Robertson: Reviewed the initial draft and offered expert advice and guidance for writing subsequent drafts. Professor Amudha Poobalan: Instrumental in developing and refining the search strategy. Project administration: ND; Supervision: LD, HMM, ZCS, BE; Methodology: ND, LD, HMM, ZCS, BE, MA; Data curation: ND, LD, HMM, ZCS MA; Formal analysis: ND; Resources: ND; Visualization: ND; Writingoriginal draft: ND; Writing– review & editing: ND, LD, HMM,ZCS,BE,MAPeer reviewe
Modern Arabic literary biography : a study of character portrayal in the works of Egyptian biographers of the first half of the twentieth century, with special reference to literary biography
No full textIn Chapter one, I presented a comparative definition of the meaning of Sirah (PI.Siyar), Tarjamah (Pl. Tarajim), Manaqib, Tabaqat and Maghazi as they were understood in antiquity. I also showed how the meaning of Sirah in modern times has only narrowly developed. Although the method of biographical writing continuously developed in Europe, it hardly progressed in Modem Arabic Literature. The only exception was seen in the writings by the pioneers of enlightenment in Egypt at the beginning of the twentieth century. This change of direction relied on borrowing European methodology in biographical writing.
In chapter two, I reviewed the early attempts at writing biographies in the nineteenth century by Abd al Rahman al- Jabarti and Ali Mubarak. Although both were the first
pioneers in this respect, yet they followed the footpath of classical approach above all that of al-Maqarizi from whom -Ali Mubarak derived inspiration in his book Al-Khitat al-Tawfiqiyyah.
In chapter three, I studied the twentieth century, starting with traditional biography writers who could not employ European methodologies and whose writings oscillated between biographical notes and biographical sketches; or whose texts were more of a literary study than a biography proper.
In chapters four to nine, I selected the most renowned, productive writers who best represented methodologies of biography writing. Perhaps certain writers have not
been mentioned in this period of study. This is not out of negligence but simply because their texts were totally out of reach, or their writings did not exhibit the
required literary criteria.
All methodologies representing the theory of biography writing in Egypt have been analysed in these chapters. All, in fact, form a digestion or assimilation of French,English and German schools. In Egypt, Taha Husayn is considered the chairman of the French school, al-Mazini and al-Aqqad of the English/German schools, al-Nuwaihi of the psychoanalytical/anatomical school and Sidqi who employed both. By contrast, al Iryan was the trailblazer of the distinguished biographical novel.
In these chapters, I tried to lay out the general outlines these writers have produced in the production of biographical texts, and how these attempts were a successful step on the road of presenting literary biographies characterized by high world standards.
Chapter ten may well seem traditional, but it is important to give a comparative outlook on the views of biography writers themselves when they study and analyse
the same character.
Among the characters studied ,I selected Bashsliar, Abu Nuwas, Ibn al-Run-i, al-Mutanabbi and al-Maarri. These are outstanding landmarks in the history of Arab verse and the subject of a multitude of studies as well. Modern biographers took these figures as a test field for the deployment and employment of biographical methodologies. I selected these examples to provide comparisons and explain how far these biographies were successful in producing a biography or a profile of those classical poets.
The conclusion and the bibliographical list arrived at the end of research.
I wish, however, to clarify one important point here. It seems that I could not fix the year 1950 as the temporal parameter of my research but took some textswhich were
published shortly beyond that point. The reason for this obvious extension was either to give additional useful details or simply because chapters of such texts had already
been published prior to that year and were known to the readership.
At times I would satisfy myself with analysing the part rather than the whole. This again was meant to eschew repetition or was due to the fact that the book in question
was not available
Genome-wide association study identifies various loci underlying agronomic and morphological traits in diversified potato panel
No full textPotato is one of the most important food crops all over the world. Breeding activities for this crop are mainly aimed to improve the quality and yield of tuber. However, genetic architecture of various traits contributing to the quality and yield of potato are not yet completely understood. Genome wide association studies provides a broader way to identify the genomic regions associated with various traits. Panels of 237 tetraploid potato genotypes from different countries were grown for two consecutive years 2016 and 2017 at experimental research area of Potato research center Nigde, Turkey. A genome wide association study using SolCAP 12K array was performed for various morpho-agronomic traits. Structure algorithm and neighborhood joining analysis clearly divided all genotypes into 4 clusters on the basis of their origin. For the marker trait association, Mixed Linear Model in TASSEL was performed and 36 genomic regions were found for the traits under study. The mean r(2) value was found to be 0.92 and mean significant LD was 47.5% in the populations. LD patterns reflected the breeding history of potato. The findings of present study provide a framework which could be useful for future potato breeding programs to enhance the production and to reduce the challenges in the coming years to feed world's population.Scientific and Technological Research Council of Turkey (TUBITAK) [115O406]This study was financially supported by The Scientific and Technological Research Council of Turkey (TUBITAK) under the Project #115O406. The paper is a part of Phd thesis of corresponding author. I would also like to thank Dr. Marion Roeder for providing me the opportunity to work under her supervision in Institute of Plant Genetics and Crop Plant Research (IPK). I would also like to thank Dr. Quddoos ul Haq Muqaddasi and Dr. Dalia Alomari for their support throughout my stay in GERMANY
SNP Markers Associated with Some Root, Stolon, and Tuber Traits in Tetraploid Potatoes (Solanum tuberosum L.) Grown Under Diverse Growing Systems
No full textNumerous loci, environmental factors, and their interactions have an impact on the phenotypic diversity of several significant traits in plants. One approach put forth in recent years for genetic research and finding quantitative trait loci (QTLs) responsible for the specific trait is association mapping. The purpose of the current study was to pinpoint the genetic underpins of significant underground traits in potato. A panel of 192 diverse tetraploid potato genotypes from different countries were grown under different growing conditions (i.e., aeroponics and pot) to study root, stolon and tuber traits. Significant differences (P <= 0.01) were found between the genotypes for all examined traits, and the heritability (H-2) of the traits ranged from 0.74 to 0.94. Genotyping was carried out using the SolCAP 25K array. 21,226 polymorphic SNPs were used for association mapping of underground traits. A GWASpoly R package was implemented for the marker-trait associations, and 78 genomic regions were found associated with the traits under investigation.. The history of potato breeding was reflected in LD patterns. The identified SNPs have their putative gene functions related to the root and stolon architecture and tuber growth (i.e., WRKY transcription factor, MAPK, the GTP cyclohydrolase 1 (i.e., GTPCHI), Glutathionyl-hydroquinone reductase, and pyrophosphate-fructose 6-phosphate 1-phosphotransferase subunit alpha (PFPase). The results of the present study provides a framework that could be helpful for future potato breeding programs to increase tuber production and reduce the challenges of feeding the world's population in the years to come.Nigde Omer Halisdemir University [115O949]; Scientific and Technological Research Council of Turkey (TUBITAK)The Scientific and Technological Research Council of Turkey (TUBITAK) financially supported this study through Project # 115O949. The current paper belongs to the Ph.D. thesis of the corresponding author. He would also like to thank my colleagues for helping in the acquisition of phenotyping data
Association mapping reveals novel genomic regions controlling some root and stolon traits in tetraploid potato (Solanum tuberosum L.)
No full textTuber crops have measurable biological variation in root and stolon phenotyping and thus may be utilized to identify genomic regions associated with these variations. This is the first comprehensive association mapping study related to potato root and stolon traits. A diverse panel of 192 tetraploid potato (Solanum tuberosum L.) genotypes were grown in aeroponics to reveal a biologically significant variation and detection of genomic regions associated with the root and stolon traits. Phenotyping of root traits was performed by image analysis software WinRHIZO (a root scanning method), and stolon traits was measured manually, while SolCAP 25K potato array was used for genotyping. Significant variation was observed between the potato genotypes for root and stolon traits along with high heritabilities (0.80 in TNS to 0.95 in SL). For marker-trait associations, Q + K linear mixed model was implemented and 50 novel genomic regions were detected. Significantly associated SNPs with stolon traits were located on chr 4, chr 6, chr 7, chr 9, chr 11 and chr 12, while those linked to root traits on chr 1, chr 2, chr 3, chr 9, chr 11, and chr 12. Structure and PCA analysis grouped genotypes into four sub-populations disclosing population genetic diversity. LD decay was observed at 2.316 Mbps (r(2) = 0.29) in the population. The identified SNPs were associated with genes performing vital functions such as root signaling and signal transduction in stress environments (GT-2 factors, protein kinases SAPK2-like and protein phosphatases StPP1), transcriptional and post-transcriptional gene regulation (RNA-binding proteins), sucrose synthesis and transporter families (UGPase, Sus3, SuSy, and StSUT1) and PVY resistance (Ry sto). The findings of our study can be employed in future breeding programs for improvement in potato production.Scientific and Technological Research Council of Turkey (TUBITAK) [115O949]The Scientific and Technological Research Council of Turkey (TUBITAK) was financially supported this study through Project # 115O949. The current paper belongs to the Ph.D. thesis of the corresponding author. I would also like to thank Eric Kuopuobe Naawe for helping in the maintenance of the aeroponic system during research work. Furthermore, an appreciation was acknowledged by all my colleagues during the phenotyping
Intra-thecal antibiotics for post-operative gram negative meningitis and ventriculitis.
No full textBACKGROUND: Postoperative meningitis is a growing cause of concern especially with the evolution of multidrug resistant organism. OBJECTIVES: The authors evaluate the use of intraventricular/intrathecal antibiotics for postoperative Gramnegative meningitis in patients whom intravenous antibiotics were ineffective METHODS: Adult consecutive patients with cerebrospinal fluid (CSF) culture proven Gram-negative postoperative meningitis/ventriculitis, in which intravenous antibiotics were ineffective were included from January 2008- December 2012. RESULTS: From January 2008 to December 2012 there were 94 reported cases of post-operative meningitis/ventriculitis at our institution. Of these, 63 were culture proven Gram positive and were treated accordingly. Thirty one patients either had isolated Gram negative meningitis/ventriculitis or mixed Gram positive/negative, infection, of which 21 patients required treatment with IVT/IT antibiotics. Of these 21 patients, 16 were male and 5 were female. Mean age was 41.7 + 11 years (range 26 to 58 years). All except one of these patients had cranial surgery. Of the 21 patients in our study, 8 were admitted with a GCS of \u3e12 while the remaining had a GCS \u3c 12. Acinetobacter was the most common organism isolated on CSF culture (n=14) followed by Klebsiella (n=3), Pseudomonas (n=1) and Enterobacter (n=1). 1 patient had polymicrobial growth. Three antibiotics were used in the IVT/IT treatment group; Amikacin, Polymixin B and Colistin. The indication was primarily based on the sensitivity of pathogenic organisms cultured on CSF of individual patients; table 2 shows the resistance pattern of the organism. Amikacin was used in 7 patients, Polymixin B in 9 patients and Colistin in 5 patients. A combination of 2 IVT/IT antibiotics, Polymixin B and Amikacin was used in 1 patient. An EVD was used as the route of administration in 13 cases (62%) while a lumbar drain was used in 8 (38%) patients. Median duration between starting of IT/IVT after being diagnosed with post neurosurgical meningitis/ventriculitis was 3 days (Range 0-7days). Median duration of IVT/IT therapy was 15 (9-25) days. CSF sterility was achieved in all of the patients with a median time to sterility being 7.1 + 3.8 (Range 2-16) days (EVD 7.08 + 3.37 days vs. LD 7.1 + 4.6 days, p-value 0.176). Only two patients achieved CSF sterility within 48 hours. RESULTS: Discharge GCS improved in 2 remained the same in 7 and deteriorated in 12 patients. Median hospital stay was 38 days (20-257days) with the EVD group [46 (29-72)] having a longer stay than LD group [32.5 (20-76) days) p-value 0.07. At 6 months follow up favorable outcomes were seen in 14 (66.7%) patients and 7 (33.3%) patients remained in an unfavorable state. One patient died during treatment and although the patient had Acinetobacter species infection, the cause of death was found to be a massive pulmonary embolus. No adverse effects attributable to IVT/IT therapy were noted in the study. CONCLUSION: The findings of this study suggest that IVT antibiotic therapy is a useful option especially in patients who are non-responsive to standard intravenous therapy with little or no side effects. [ABSTRACT FROM AUTHOR] Copyright of Journal of Pioneering Medical Sciences is the property of Journal of Pioneering Medical Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder\u27s express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.
Different sealing processes for a plasma electrolytic oxidation coating (PEO) on AA6082
No full textLAUREA MAGISTRALEDifferent Sealing Processes for a Plasma Electrolytic Oxidation (PEO) Coating on AA6082
TESI DI LAUREA MAGISTRALE IN
MATERIALS ENGINEERING AND NANOTECHNOLOGY
INGEGNERIA DEI MATERIALI E DELLE NANOTECNOLOGIE
Author: Muhammad Ibrahim Adam Ahmed
Student ID: 10817658
Advisor: Prof. Marco Ormellese
Co-advisor: Dr. Federica Ceriani
Academic Year: 2023-2024
Abstract
Aluminum alloys of the 6xxx family (Al-Mg-Si) are famous for their lightweight and other good properties such as mechanical, thermal, and electrical properties, as well as corrosion resistance. In almost all neutral environments, they spontaneously generate a passive, stable oxide film that protects the underlying metal from subsequent severe corrosion phenomena. However, this film is thin (a few nanometers thick) and insufficient to ensure passivity in the various fields of aluminum application, especially if the environment is alkaline, acidic, or containing aggressive species. Therefore, electrochemical treatments are carried out to create a thicker oxide layer, well adherent to the surface, capable of resisting attacks from aggressive species. Among these, there is Plasma Electrolytic Oxidation (PEO), an emerging plasma-based process that allows the creation of a thick oxide layer using high electric potentials and environmentally friendly alkaline electrolytes - free from harmful substances for humans and the environment. The structure of the oxide created through PEO is notably porous, due to the plasma discharges that occur during the process along with the liberation of gases. Therefore, it is necessary to seal those pores to hinder the passage of corrosive species. Some of the sealants could have two-fold effects, not only physically blocking the pores, but also providing inhibiting phenomenon for active corrosion protection. This work aims to fine-tune the electrical parameters for obtaining a thicker oxide layer and to compare some immersion sealing methods performed on AA6082 substrates treated with PEO. Mainly cerium nitrate and in-situ synthesis of LDH (Layered Double Hydroxide) structure sealings were performed. The analysis of each sample is based on characterization tests to study the morphology, composition, and elemental distribution of the oxide before and after sealing, through SEM, EDS, and XRD maps. Electrochemical tests are conducted to evaluate susceptibility to corrosion phenomena, stability, and integrity of the treated oxide in aggressive environments, through Electrochemical Impedance Spectroscopy (EIS), Linear Polarization Resistance (LPR), and Potentiodynamic polarization tests (PDP). Both sealing processes showed much greater corrosion protection than the bare PEO coating. Their protective behavior is similar since both LDH and cerium nitrate sealings exhibited polarization resistance (R_p) and corrosion current density (i_corr) in the same order of magnitude. Both R_p and i_corr are three orders of magnitude higher and lower respectively compared to the PEO base.
Keywords: aluminum alloy, PEO, corrosion resistance, cerium, LDH
Abstract in Italiano
Le leghe di alluminio della famiglia 6xxx (Al-Mg-Si) sono famose per la loro leggerezza e altre buone proprietà come proprietà meccaniche, termiche ed elettriche, nonché resistenza alla corrosione. In quasi tutti gli ambienti neutri, generano spontaneamente un film di ossido passivo e stabile che protegge il metallo sottostante da successivi gravi fenomeni di corrosione. Tuttavia, questo film è sottile (pochi nanometri di spessore) e insufficiente per garantire la passività nei vari campi di applicazione dell'alluminio, soprattutto se l'ambiente è alcalino, acido o contenente specie aggressive. Pertanto, vengono eseguiti trattamenti elettrochimici per creare uno strato di ossido più spesso, ben aderente alla superficie, in grado di resistere agli attacchi di specie aggressive. Tra questi, c'è l'ossidazione elettrolitica al plasma (PEO), un processo emergente basato sul plasma che consente la creazione di uno spesso strato di ossido utilizzando alti potenziali elettrici ed elettroliti alcalini ecologici, privi di sostanze nocive per l'uomo e l'ambiente. La struttura dell'ossido creato tramite PEO è notevolmente porosa, a causa delle scariche di plasma che si verificano durante il processo insieme alla liberazione di gas. Pertanto, è necessario sigillare quei pori per ostacolare il passaggio di specie corrosive. Alcuni dei sigillanti potrebbero avere effetti doppi, non solo bloccando fisicamente i pori, ma anche fornendo fenomeni inibitori per una protezione attiva dalla corrosione. Questo lavoro mira a mettere a punto i parametri elettrici per ottenere uno strato di ossido più spesso e a confrontare alcuni metodi di sigillatura a immersione eseguiti su substrati AA6082 trattati con PEO. Sono stati eseguiti principalmente nitrato di cerio e sintesi in situ di sigillature di strutture LDH (Layered Double Hydroxide). L'analisi di ciascun campione si basa su test di caratterizzazione per studiare la morfologia, la composizione e la distribuzione elementare dell'ossido prima e dopo la sigillatura, tramite mappe SEM, EDS e XRD. I test elettrochimici vengono condotti per valutare la suscettibilità ai fenomeni di corrosione, la stabilità e l'integrità dell'ossido trattato in ambienti aggressivi, tramite spettroscopia di impedenza elettrochimica (EIS), resistenza alla polarizzazione lineare (LPR) e test di polarizzazione potenziodinamica (PDP). Entrambi i processi di sigillatura hanno mostrato una protezione dalla corrosione molto maggiore rispetto al rivestimento PEO nudo. Il loro comportamento protettivo è simile poiché sia le sigillature LDH che quelle in nitrato di cerio hanno mostrato resistenza alla polarizzazione (R_p) e densità di corrente di corrosione (i_corr) nello stesso ordine di grandezza. Sia R_p che i_corr sono rispettivamente tre ordini di grandezza superiori e inferiori rispetto alla base PEO.
Parole chiave: lega di alluminio, PEO, resistenza alla corrosione, cerio, LDHAluminum alloys of the 6xxx family (Al-Mg-Si) are famous for their lightweight and other good properties such as mechanical, thermal, and electrical properties, as well as corrosion resistance. In almost all neutral environments, they spontaneously generate a passive, stable oxide film that protects the underlying metal from subsequent severe corrosion phenomena. However, this film is thin (a few nanometers thick) and insufficient to ensure passivity in the various fields of aluminum application, especially if the environment is alkaline, acidic, or containing aggressive species. Therefore, electrochemical treatments are carried out to create a thicker oxide layer, well adherent to the surface, capable of resisting attacks from aggressive species. Among these, there is Plasma Electrolytic Oxidation (PEO), an emerging plasma-based process that allows the creation of a thick oxide layer using high electric potentials and environmentally friendly alkaline electrolytes - free from harmful substances for humans and the environment. The structure of the oxide created through PEO is notably porous, due to the plasma discharges that occur during the process along with the liberation of gases. Therefore, it is necessary to seal those pores to hinder the passage of corrosive species. Some of the sealants could have two-fold effects, not only physically blocking the pores, but also providing inhibiting phenomenon for active corrosion protection. This work aims to fine-tune the electrical parameters for obtaining a thicker oxide layer and to compare some immersion sealing methods performed on AA6082 substrates treated with PEO. Mainly cerium nitrate and in-situ synthesis of LDH (Layered Double Hydroxide) structure sealings were performed. The analysis of each sample is based on characterization tests to study the morphology, composition, and elemental distribution of the oxide before and after sealing, through SEM, EDS, and XRD maps. Electrochemical tests are conducted to evaluate susceptibility to corrosion phenomena, stability, and integrity of the treated oxide in aggressive environments, through Electrochemical Impedance Spectroscopy (EIS), Linear Polarization Resistance (LPR), and Potentiodynamic polarization tests (PDP). Both sealing processes showed much greater corrosion protection than the bare PEO coating. Their protective behavior is similar since both LDH and cerium nitrate sealings exhibited polarization resistance (R_p) and corrosion current density (i_corr) in the same order of magnitude. Both R_p and i_corr are three orders of magnitude higher and lower respectively compared to the PEO base.
Keywords: aluminum alloy, PEO, corrosion resistance, cerium, LD
