Corrosion resistance and superhydrophobicity of one-step polypropylene coating on anodized AZ31 Mg alloy  

作　　者：Zhao-Qi Zhang Li Wang Mei-Qi Zeng Rong-Chang Zeng Cun-Guo Lin Zhen-Lin Wang Dong-Chu Chen Qiang Zhang 

机构地区：[1]Corrosion Laboratory for Light Metals,College of Material Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China [2]State Key Laboratory for Marine Corrosion and Protection,Luoyang Ship Material Research Institute,Qingdao 266101,China [3]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450002,China [4]College of Materials Science and Engineering,Chongqing University of Technology,Chongqing 400065,China [5]School of Materials Science and Energy Engineering,Foshan University,Foshan 528000,China

出　　处：《Journal of Magnesium and Alloys》2021年第4期1452-1466,共15页镁合金学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(51571134);the SDUST Research Fund(2014TDJH104).

摘　　要：Superhydrophobic coatings have been considerably used in corrosion and its protection of metallic Mg.And the comprehensive performance(hydrophobicity,bonding strength,and corrosion resistance,etc.)of the top coating may be highly dependent on the physical and chemical properties of the primer or under coat.Herein,an integrated superhydrophobic polypropylene(PP)coating was fabricated on the micro-arc oxidized Mg substrate via one-step dipping.Surface morphologies and chemical compositions of the composite coating were examined through Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD),and field-emission scanning electron microscopy(FESEM)together with X-ray photoelectron spectroscopy(XPS).The surface wettability of the coating was determined by contact angle and sliding angle.The corrosion-resistant performance was evaluated via electrochemical and immersion measurements.The results showed that the hybrid coating possessed micron-scaled granular structure on the surface with a high water contact angle of 167.2±0.8°and a low water sliding angle of 2.7±0.5°.The corrosion resistance of superhydrophobic coating was obviously enhanced with a low corrosion current density of 8.76×10^(−9)A/cm^(2),and the coating still maintained integrity after 248 h of immersion in 3.5wt%NaCl aqueous solution.The MAO coating provides better adhesion of PP to the surface.Hence,the superhydrophobic coating exhibited superior bonding strength,corrosion resistance and durability.

关 键 词：Magnesium alloy Corrosion resistance SUPERHYDROPHOBICITY Bonding strength Polymer coating 

分 类 号：TG174.4[金属学及工艺—金属表面处理]