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

IF 2.3 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Anti-corrosion Methods and Materials Pub Date : 2023-09-06 DOI:10.1108/acmm-07-2023-2858

Donghui Hu, Shenyou Song, Zongxing Zhang, Linfeng Wang

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Abstract

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.

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桥梁缆索用高强度钢丝Zn–Al–Mg合金涂层耐腐蚀性能的试验研究

目的解决桥梁缆索用钢丝的耐腐蚀寿命难以满足要求的难题。设计/方法/方法开发了电缆钢丝的“两步”热浸镀锌工艺，包括铝镁合金的热镀锌和热镀锌。通过醋酸盐喷涂试验和电化学试验，比较了Zn–6Al–1Mg和Zn–10Al–3Mg合金镀层钢丝的腐蚀速率、极化曲线和阻抗，揭示了Zn–Al–Mg合金镀层钢丝腐蚀机理。结果Zn–10Al–3Mg合金镀层钢丝的耐蚀性最好，是纯镀锌钢丝的7倍多。Zn–10Al–3Mg合金镀层的腐蚀电流低于Zn–6Al–1Mg合金镀层，而前者的电容电弧和阻抗值高于后者，表明Zn–10Al-3Mg合金涂层的耐腐蚀性优于Zn–6Al-1Mg合金涂层。此外，用于桥梁电缆的Zn–Al–Mg合金涂层钢丝具有涂层“自我修复”的功能。独创性/价值控制热浸镀锌阶段的温度和时间可以减少过渡层的厚度，并解决Zn–Al-Mg合金镀层中过渡层因桑德林效应而容易开裂的问题。

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来源期刊

Anti-corrosion Methods and Materials 工程技术-冶金工程

CiteScore

2.80

自引率

16.70%

发文量

审稿时长

13.5 months

期刊介绍： Anti-Corrosion Methods and Materials publishes a broad coverage of the materials and techniques employed in corrosion prevention. Coverage is essentially of a practical nature and designed to be of material benefit to those working in the field. Proven applications are covered together with company news and new product information. Anti-Corrosion Methods and Materials now also includes research articles that reflect the most interesting and strategically important research and development activities from around the world. Every year, industry pays a massive and rising cost for its corrosion problems. Research and development into new materials, processes and initiatives to combat this loss is increasing, and new findings are constantly coming to light which can help to beat corrosion problems throughout industry. This journal uniquely focuses on these exciting developments to make essential reading for anyone aiming to regain profits lost through corrosion difficulties. • New methods, materials and software • New developments in research and industry • Stainless steels • Protection of structural steelwork • Industry update, conference news, dates and events • Environmental issues • Health & safety, including EC regulations • Corrosion monitoring and plant health assessment • The latest equipment and processes • Corrosion cost and corrosion risk management.