Experimental study on corrosion resistance of Zn-Al-Mg alloy coating of high-strength steel wires for bridge cables

被引：5
|
作者：
Hu, Donghui [1 ,2 ]
Song, Shenyou [3 ]
Zhang, Zongxing [4 ]
Wang, Linfeng [2 ]
机构：
[1] Univ Sci & Technol Beijing, Inst Engn Technol, Beijing, Peoples R China
[2] Baosteel Grp Nantong Wire Prod Co Ltd, Nantong, Peoples R China
[3] Management Ctr Shenzhen Zhongshan Bridge, Zhongshan, Peoples R China
[4] China Univ Min & Technol, Jiangsu Key Lab Environm Impact & Struct Safety En, Xuzhou, Peoples R China
来源：
ANTI-CORROSION METHODS AND MATERIALS | 2023年 / 70卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Steel wire; Zn-Al-Mg alloy coating; Two-step" hot-dip coating; Corrosion resistance; Self-repairing; SODIUM-CHLORIDE; Q235B STEEL; EVOLUTION; BEHAVIOR; MICROSTRUCTURE; MECHANISMS; MAGNESIUM; PRODUCTS;
D O I：
10.1108/ACMM-07-2023-2858
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Purpose This paper aims to figure out the conundrum that the corrosion resistance longevity of steel wires for bridge cables was arduous to meet the requirements.Design/methodology/approach The "two-step" hot-dip coating process for cable steel wires was developed, which involved first hot-dip galvanizing and then hot-dip galvanizing of aluminum magnesium alloy. The corrosion rate, polarization curve and impedance of Zn-6Al-1Mg and Zn-10Al-3Mg alloy-coated steel wires were compared through acetate spray test and electrochemical test, and the corrosion mechanism of Zn-Al-Mg alloy-coated steel wires was revealed.Findings The corrosion resistance of Zn-10Al-3Mg alloy-coated steel wires had the best corrosion resistance, which was more than seven times that of pure zinc-coated steel wires. The corrosion current of Zn-10Al-3Mg alloy-coated steel wires was lower than that of Zn-6Al-1Mg alloy-coated steel wires, whereas the capacitive arc and impedance value of the former were higher than that of the latter, making it clear that the corrosion resistance of Zn-10Al-3Mg was better than that of Zn-6Al-1Mg alloy coating. Moreover, the Zn-Al-Mg alloy-coated steel wires for bridge cables had the function of coating "self-repairing."Originality/value Controlling the temperature and time of the hot dip galvanizing stage can reduce the thickness of transition layer and solve the problem of easy cracking of the transition layer in the Zn-Al-Mg alloy coating due to the Sandelin effect.
引用
收藏
页码：459 / 468
页数：10
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