Active corrosion protection of super-hydrophobic corrosion inhibitor intercalated Mg-Al layered double hydroxide coating on AZ31 magnesium alloy  

作　　者：Xin Wang Chuan Jing Yuxiang Chen Xiushuang Wang Gang Zhao Xing Zhang Liang Wu Xiaoying Liu Biqin Dong Yuxin Zhang 

机构地区：[1]State Key Laboratory of Mechanical Transmissions,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,P.R.China [2]Academy of Dazu Rock Carvings,Chongqing 402360,P.R China [3]Research Institute of Petroleum Engineering Technology,Shengli Oilfield Company,Sinopec,Dongying 257000,P.R.China [4]Engineering Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education,Chongqing Key Laboratory of Catalysis and New Environmental Materials,College of Environment and Resources,Chongqing Technology and Business University,Chongqing 400067,P.R.China [5]Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,Shenzhen University,Shenzhen 518060,P.R.China

出　　处：《Journal of Magnesium and Alloys》2020年第1期291-300,共10页镁合金学报（英文）

基　　金：This work is financially supported by the Graduate Research and Innovation of Chongqing,China(Grant No.CYB18002);the National Natural Science Foundation of China(Grant No.21576034);the State Education Ministry and Fundamental Research Funds for the Central Universities(2019CDQYCL042,106112017CDJXSYY0001,2018CDYJSY0055,106112017CDJQJ138802,106112017CDJSK04XK11,2018CDQYCL0027);the Joint Funds of the National Natural Science Foundation of China-Guangdong(Grant No.U1801254);Fundamental Re-search Funds for the Central Universities(NO.2018CDJDCD0001).

摘　　要：Magnesium alloys,the advanced lightweight structural materials,have been successfully applied in the manufacturing field.Unfortunately,their poor corrosion resistance restrains the potential wide applications.In this work,anti-corrosion coatings were fabricated via the insitu growth of the corrosion inhibitors intercalated magnesium-aluminum layered double hydroxide(Mg-Al LDH)on AZ31 magnesium alloy and then post-sealing it by a super-hydrophobic coating.SEM,XRD,EDS,FTIR,XPS and contact angle test were conducted to analyze physical/chemical features of these coatings.Potentiodynamic polarization curves and electrochemical impedance spectroscopy were recorded to assess the anti-corrosion performance of prepared coatings.Surprisingly,Mg-Al LDH with molybdate intercalation and lauric acid modification achieves the excellent corrosion inhibition performance(99.99%)due to the multicomponent synergistic effect such as the physical protection of Mg-Al LDH,the corrosion inhibition of molybdate and super-hydrophobic properties of lauric acid.This work presents a scientific perspective and novel design philosophy to fabricate the efficient anti-corrosion coating to protect magnesium alloys and then expand their potential applications in other field.

关 键 词：Magnesium alloy SUPERHYDROPHOBICITY LDH films Corrosion inhibitor Corrosion resistance 

分 类 号：TG174.4[金属学及工艺—金属表面处理]