Enhancing corrosion resistance of plasma electrolytic oxidation coatings on AM50 Mg alloy by inhibitor containing Ba(NO_(3))_(2) solutions  

作　　者：Jirui Ma Xiaopeng Lu Santosh Prasad Sah Qianqian Chen You Zhang Fuhui Wang 

机构地区：[1]Corrosion and Protection Center,Northeastern University,Shenyang,110819,China [2]Faculty of Engineering,Hokkaido University,Hokkaido 060-8628,Japan [3]College of New Materials and Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第9期2048-2061,共14页矿物冶金与材料学报（英文版）

基　　金：financial support by the National Natural Science Foundation of China(No.52071067);Shenyang Young and Middle-aged Science and Technology Innovation Talent Support Program,China(No.RC231178);Natural Science Foundation of Liaoning Province,China(No.2022-YGJC-16);the Fundamental Research Funds for the Central Universities,China(No.N2302019).

摘　　要：To enhance the long-term corrosion resistance of the plasma electrolytic oxidation(PEO)coating on the magnesium(Mg)alloy,an inorganic salt combined with corrosion inhibitors was used for posttreatment of the coating.In this study,the corrosion performance of PEO-coated AM50 Mg was significantly improved by loading sodium lauryl sulfonate(SDS)and sodium dodecyl benzene sulf-onate into Ba(NO_(3))_(2) post-sealing solutions.Scanning electron microscopy,X-ray photoelectron spectroscopy,X-ray diffraction,Fourier transform infrared spectrometer,and ultraviolet-visible analyses showed that the inhibitors enhanced the incorporation of BaO_(2) into PEO coatings.Electrochemical impedance showed that post-sealing in Ba(NO_(3))_(2)/SDS treatment enhanced corrosion resistance by three orders of magnitude.The total impedance value remained at 926Ω·cm^(2)after immersing in a 0.5wt%NaCl solution for 768 h.A salt spray test for 40 days did not show any obvious region of corrosion,proving excellent post-sealing by Ba(NO_(3))_(2)/SDS treatment.The corrosion resistance of the coating was enhanced through the synergistic effect of BaO2 pore sealing and SDS adsorption.

关 键 词：Mg plasma electrolytic oxidation posttreatment corrosion resistance 

分 类 号：TG174.4[金属学及工艺—金属表面处理]