Corrosion resistance properties of colored zirconium conversion coating and powder coating on cold-rolled steel  

作　　者：Ai-Hua Wu Yao-Zu Wang Tong-Kuan Xu Zhi Li Sheng-Ji Luan Feng-Zuo Qu 

机构地区：[1]Shenzhen Key Laboratory of Environment Simulation and Pollution Control,PKU-HKUST Shenzhen-HongKong Institution,Shenzhen 518057,China [2]Faculty of Light Industry and Chemical Engineering,Dalian Polytechnic University,Dalian 116034,China

出　　处：《Rare Metals》2023年第3期1005-1010,共6页稀有金属（英文版）

基　　金：financially supported by Shenzhen Technology Development Project(No.CXZZ20140902141250786);Guangdong Science and Technology Project(No.2014A010105004)。

摘　　要：Jiuhe Corporation developed a new surface pretreatment for producing a phosphate-free and colored zirconium conversion coating on cold-rolled steel(CRS).Scanning electron microscopy(SEM)and energy-dispersive spectroscopy(EDS)were applied to study the surface morphology and elemental composition of the golden yellow-colored conversion coating.Elec trochemic al impedance spectroscopy(EIS)was used to investigate the electrochemical performance of the conversion coatings with different colors.The corrosion resistance properties of the powder coatings were characterized using the neutral salt spray test(NSS)and the tape adhesion test.The EIS and NSS results demonstrate that the colored zirconium conversion coatings exhibit excellent corrosion resistance properties compared with the bare CRS.The golden yellow-colored conversion coating has a maximum EIS value(748Ω·cm^(2))and achieves 0 mm degree of corrosion,as stipulated by EN ISO 4628-8.This paper proposes a hypothesis concerning the ZrO_(2)-(β-FeOOH)-polymer conversion reaction to explain the color changes.

关 键 词：Surface pretreatment Colored conversion coating Zirconium oxide Powder coating Corrosion protection 

分 类 号：TG174.4[金属学及工艺—金属表面处理]