Application of Plasma Electrolytic Oxidation to the Novel Aircraft Aluminum Alloy for Enhancing Corrosion Resistance
Plasma electrolytic oxidation (PEO) has been considered as a novel technique to form ceramic coatings on aluminum alloys for corrosion protection.The effect of PEO on the intergranular corrosion (IGC) behavior of the novel highstrength aluminum alloy 7A85 was investigated.Electrochemical polarization technology was used to study the influence of PEO on the electrochemical corrosion behavior of AA 7A85.The IGC mechanisms of PEO and PEO combined with sealing-treated AA 7A85 were studied by metallographic analysis,XRD analysis,and scanning electron microscopy.The results show that AA 7A85- T7452 is very sensitive to IGC.PEO would reduce the largest corrosion depth by 41.6 %.PEO without sealing did not eliminate the IGC for the micropores and microcracks in the oxide coating.However,PEO combined the SiO2 sol gel sealing treatment could effectively protect the AA 7A85-T7452 from IGC for the good corrosion resistance and barrier function of the sealed coating.
7A85 aluminum alloy Plasma electrolytic oxidation Intergranular corrosion
Zuoyan Ye Daoxin Liu Chongyang Li Xiaoming Zhang Zhi Yang Mingxia Lei
Corrosion and Protection Research Laboratory, Northwestern Polytechnical University, Xi’an 710072, C AVIC the First Aircraft Institute, Xi’an 710089, China
国际会议
西安
英文
265-274
2013-11-25（万方平台首次上网日期，不代表论文的发表时间）