Robert Sottor, Ricarda Gruen, Kerstin Kremmer, S. Lederer, M. Schneider, Wolfram Fuerbeth
{"title":"Plasma Electrolytic Oxidation on Magnesium AZ31 with Sepiolite as Inhibitor Carrier for Improved Corrosion Protection","authors":"Robert Sottor, Ricarda Gruen, Kerstin Kremmer, S. Lederer, M. Schneider, Wolfram Fuerbeth","doi":"10.3390/cmd4030025","DOIUrl":null,"url":null,"abstract":"Plasma electrolytic oxidation (PEO) in an alkaline silicate electrolyte containing nanosized sepiolite fibers was carried out on magnesium alloy AZ31. The mineral fibers were loaded with different corrosion inhibitors and incorporated in situ during the PEO treatment. The composition and microstructure of the PEO coatings were investigated by SEM. It was shown that the fibers are located on the surface as well as inside the “weak spots” of the coating, i.e., pores and discharge channels. The fixation of the particles is caused by sintering due to the heat developed during the PEO treatment. Investigations using electrochemical impedance spectroscopy and linear sweep voltammetry in 0.01 M NaCl solution confirmed an improvement of the corrosion protection. The use of the inhibitors shifts the critical pitting potential in the anodic direction. Regarding efficiency, cerium-loaded sepiolite showed the best behavior by shifting the pitting potential by +0.9 V.","PeriodicalId":10693,"journal":{"name":"Corrosion and Materials Degradation","volume":"47 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Corrosion and Materials Degradation","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3390/cmd4030025","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Plasma electrolytic oxidation (PEO) in an alkaline silicate electrolyte containing nanosized sepiolite fibers was carried out on magnesium alloy AZ31. The mineral fibers were loaded with different corrosion inhibitors and incorporated in situ during the PEO treatment. The composition and microstructure of the PEO coatings were investigated by SEM. It was shown that the fibers are located on the surface as well as inside the “weak spots” of the coating, i.e., pores and discharge channels. The fixation of the particles is caused by sintering due to the heat developed during the PEO treatment. Investigations using electrochemical impedance spectroscopy and linear sweep voltammetry in 0.01 M NaCl solution confirmed an improvement of the corrosion protection. The use of the inhibitors shifts the critical pitting potential in the anodic direction. Regarding efficiency, cerium-loaded sepiolite showed the best behavior by shifting the pitting potential by +0.9 V.
在含纳米海泡石纤维的碱性硅酸盐电解质中对镁合金AZ31进行了等离子体电解氧化(PEO)。在PEO处理过程中，矿物纤维被装载了不同的缓蚀剂，并在原位掺入。用扫描电镜研究了PEO涂层的组成和微观结构。结果表明，纤维既位于涂层的表面，也位于涂层的“薄弱点”，即孔隙和放电通道内。由于PEO处理过程中产生的热量，颗粒的固定是由烧结引起的。通过电化学阻抗谱和线性扫描伏安法在0.01 M NaCl溶液中的研究，证实了该材料的防腐性能有所提高。抑制剂的使用使临界点蚀电位向阳极方向移动。在效率方面，载铈海泡石表现出最好的行为，将点蚀电位移动了+0.9 V。
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