Evaluation of self-healing properties of inhibitor loaded nanoclay-based anticorrosive coatings on magnesium alloy AZ91D  

作　　者：Swapnil H.Adsul K.R.C.Soma Raju B.V.Sarada Shirish H.Sonawane R.Subasri 

机构地区：[1]Centre for Sol-Gel Coatings,International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI),Balapur,Hyderabad 500005,Telangana,India [2]Centre for Solar Energy Materials,International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI),Balapur,Hyderabad 500005,Telangana,India [3]Department of Chemical Engineering,National Institute of Technology,Warangal 506004,Telangana,India

出　　处：《Journal of Magnesium and Alloys》2018年第3期299-308,共10页镁合金学报（英文）

基　　金：financial sup-port from SERB,DST for the funding provided through grant number SB/S3/ME/007/2014.

摘　　要：This study emphasizes on the evaluation and comparison of the anticorrosive properties of sol-gel coatings with and without inhibitor loaded nanocontainers.In this case,naturally available clay nanotubes(halloysite)were loaded with cationic corrosion inhibitors Ce 3+/Zr 4+.These nanocontainers were dispersed in hybrid organic-inorganic sol-gel matrix sol.Coating was applied on magnesium alloy AZ91D using the sols containing modified and unmodified nanocontainers employing the dip coating method and cured at 130℃for 1 h in air.Corrosion resistance of coated/uncoated substrates were analyzed using electrochemical impedance spectroscopy,potentiodynamic polarization and weight loss measurements after exposure to 3.5 wt%NaCl solution for varying time durations between 24 h to 120 h.Self-healing ability of coatings was evaluated by micro-Raman spectroscopy after 120 h exposure to 3.5 wt%NaCl solution.Coatings generated after dispersion of corrosion inhibitor loaded clay in hybrid sol-gel matrix have shown more promising corrosion resistance when compared to just the sol-gel matrix coatings,after prolonged exposure to corrosive environment.

关 键 词：Self-healing coating Halloysite nanoclay Cationic corrosion inhibitors Magnesium alloy AZ91D Micro-Raman spectroscopy Corrosion protection 

分 类 号：TG1[金属学及工艺—金属学]