Self-catalytic degradation of iron-bearing chemical conversion coating on magnesium alloys — Influence of Fe content
作者机构：Corrosion Laboratory for Light MetalsCollege of Materials Science and EngineeringShandong University of Science and TechnologyQingdao266590China School of Materials Science and EngineeringZhengzhou UniversityZhengzhou450002China
出 版 物：《Frontiers of Materials Science》 (材料学前沿（英文版）)
年 卷 期：2020年第14卷第3期
页 面：296-313页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学]
基 金：This work was supported by the National Natural Science Foundation of China(Grant No.51571134) the Scientific Research Foundation of Shandong University of Science and Technology Research Fund(2014TDJH104)
主 题：magnesium alloy iron-bearing chemical conversion coating self-catalytic degradation galvanic corrosion
摘 要：A number of industrial and biomedical fields,such as hydraulic fracturing balls for gas and petroleum exploitation and implant materials,require Mg alloys with rapid *** iron-bearing phosphate chemical conversion(PCC)coating with self-catalytic degradation function was fabricated on the Mg alloy *** morphologies,chemical compositions and degradation behaviors of the PCC coating were investigated through FE-SEM,XPS,XRD,FTIR,electrochemical and hydrogen evolution *** indicated that the PCC coating was characterized by iron,its phosphates and hydroxides,amorphous Mg(OH)2 and Mg3-n(HnPO4)*** self-catalytic degradation effects were predominately concerned with the Fe concentration,chemical composition and microstructure of the PCC coating,which were ascribed to the galvanic corrosion between Fe in the PCC coating and the Mg *** coating with higher Fe content and porous microstructure exhibited a higher degradation rate than that of the AZ31 substrate,while the coating with a trace of Fe and compact surface disclosed a slightly enhanced corrosion resistance for the AZ31 substrate.
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