Non‐chromate conversion process for zinc coating with durable hydrophobicity and enhanced corrosion resistance  

作　　者：J.Y.Chen Z.Y.Hu Z.X.Li X.L.Wang C.D.Gu J.P.Tu 

机构地区：[1]School of Materials Science and Engineering,State Key Laboratory of Silicon Materials,Zhejiang University,Hangzhou,China [2]Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province,Hangzhou,China [3]Zhejiang Ecological and Environmental Monitoring Center,Hangzhou,China [4]Zhejiang Key Laboratory of Ecological and Environmental Monitoring,Forewarning and Quality Control,Hangzhou,China

出　　处：《Biosurface and Biotribology》2022年第3期266-277,共12页生物表面与生物摩擦学（英文）

基　　金：Zhejiang University K.P.Chao's High Technology Development Foundation。

摘　　要：A Zn‐based coating with durable hydrophobicity and good corrosion resistance was formed on a mild steel substrate,which involves electroplating Zn from a non‐aqueous electrolyte,followed by passivation in an oleic acid(OA)solution.The electrodeposited Zn coatings were porous,which facilitated the formation of a chemical conversion layer of Zn oleate(ZO)during OA passivation.The Zn coating after passivation had a twolayer structure,which included an outer layer of ZO with a thickness of~26μm and an inner layer of Zn with a thickness of~6μm.The outer layer ZO is a type of metal soap with a smooth surface and durable hydrophobicity,such that water droplets can easily slip off its surface.Corrosion testing and electrochemical measurements in 3.5 wt.%NaCl aqueous solution indicate that the Zn coating after OA passivation exhibits outstanding anti‐corrosion properties compared with those exhibited by pure Zn coating.The corrosion products and mechanism of the two‐layer coating were explored.This study shows that smooth metal oleate coatings can provide hydrophobicity and corrosion resistance simultaneously to mild steel substrates.

关 键 词：Anti‐corrosion ELECTRODEPOSITION Hydrophobic coating PASSIVATION Zn oleate 

分 类 号：TG174.4[金属学及工艺—金属表面处理]