表面技术2024，Vol.53Issue(2)：110-119,10.DOI:10.16490/j.cnki.issn.1001-3660.2024.02.010
热浸镀Zn-Al-Mg镀层在模拟湿热海洋大气环境中的腐蚀行为研究
Corrosion Behavior of Hot-dip Zn-Al-Mg Coating Exposed to a Simulated Hot and Humid Marine Atmosphere
摘要
Abstract
The work aims to explore the corrosion behavior and mechanism of hot-dip Zn-Al-Mg coatings in a hot and humid marine atmosphere and provide data references for hot-dip Zn-Al-Mg coatings serving in the hot and humid marine atmosphere.The corrosion behavior of the hot-dip Zn-Al-Mg coating in a simulated hot and humid marine atmosphere was analyzed by corrosion weight loss,X-ray diffraction(XRD),scanning electron microscopy(SEM),electrochemical impedance spectroscopy(EIS)and other test methods.The results showed that the corrosion product was mainly composed of Zn5(OH)8Cl2·H2O.After a period of corrosion,a small amount of ZnO and Zn5(OH)6CO3 were found.The corrosion product evolution was related to the participation of Mg in the corrosion process.The corrosion product had a lamellar structure,which was like a"sandwich"at 1 848 h.Compared with the upper and lower layers of dark substances,the bright-colored corrosion product in the middle layer had more Cl elements concentration.The corrosion rate of the hot-dip Zn-Al-Mg coating generally increased with time,and only dropped sharply in the stage of 672-840 h.Comparison of galvanized coatings corrosion in a simulated hot and humid marine environment and zinc corrosion in a hot and humid outdoor marine atmospheric environment showed that the hot-dip Zn-Al-Mg coating had high corrosion resistance in the simulated hot and humid marine atmosphere environment.The evolution of corrosion products of the hot dip Zn-Al-Mg coating in a simulated hot and humid Marine atmosphere is related to Mg in the corrosion process.The reason for the decrease of corrosion rate at 672-840 h is related to the decrease of ZnO and the increase of Zn5(OH)8Cl2·H2O in corrosion products.It is predicted that the hot-dip Zn-Al-Mg coating still has high corrosion resistance in the hot and humid harsh marine atmosphere,and it can be given priority as a construction material for hot and humid marine atmosphere environment.关键词
热浸镀Zn-Al-Mg镀层/湿热海洋大气/大气腐蚀/质量损失/腐蚀产物结构Key words
hot-dip Zn-Al-Mg coating/hot and humid marine atmosphere/atmospheric corrosion/mass loss/corrosion products structure分类
矿业与冶金引用本文复制引用
顾天真,刘雨薇,彭灿,张鹏,王振尧,汪川,孙力..热浸镀Zn-Al-Mg镀层在模拟湿热海洋大气环境中的腐蚀行为研究[J].表面技术,2024,53(2):110-119,10.基金项目
河北省自然科学基金资助项目(E2021318006) Natural Science Foundation of Hebei Province(E2021318006) （E2021318006）
