Corrosion mechanism of Zn-Al-Mg-coated steel in simulated polluted marine atmosphere

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外文摘要：The corrosion behaviour of zinc-aluminium-magnesium-coated steel in a simulated polluted marine atmospheric envi-ronment was investigated.Therefore,an indoor ageing acceleration test was carefully designed by simulating a polluted marine environment.The objective was to in-depth investigate the corrosion mechanism of Zn-Al-Mg-coated steel exposed to a simulated polluted marine environment.The experiments were carried out by scanning electron microscopy for micro-morphological characterization,X-ray diffraction,electrochemical impedance spectroscopy and electrodynamic polarization curves for the aged samples.The analysis of the results obtained after an indoor accelerated ageing test shows that Zn-Al-Mg coatings generate insoluble Zn5Cl2(OH)8·H2O and Zn4SO4(OH)6 during the corrosion process,which hinders the diffusion of corrosive substances into the substrate,and the insoluble substances are structurally dense and thus inhibit further corrosion.Therefore,this effectively inhibits the occurrence of further corrosion,and thus,Zn-Al-Mg coating can significantly extend the service life of Zn-Al-Mg-coated steel.

外文关键词：

Zn-Al-Mg-coated steelElectrochemical impedance spectroscopyPolarization curveAtmospheric corrosionMarine atmosphere

作者：

Pei-dong Ning、Li-yuan Xiao、Jin Wang、Qian-qian Liu、Kui Xiao

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作者单位：

Research Institute,JISCO Hongxing Iron and Steel Co.,Ltd.,Jiayuguan 735100,Gansu,China

Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China

基金：

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Environmental Corrosion PlatformNational Environmental Corrosion Platform

项目编号：

2017YFB030460251771029NECP2005DKA10400

出版年：

2024

DOI：

10.1007/s42243-024-01210-9

钢铁研究学报(英文版)

钢铁研究总院

钢铁研究学报(英文版)

CSTPCD

影响因子：0.584

ISSN：1006-706X

年,卷(期)：2024.31(9)