Effect of annealing treatment of hot-rolled AZ31 magnesium alloy on properties and stress corrosion resistance of MAO coatings

IF 2.3 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Anti-corrosion Methods and Materials Pub Date : 2024-05-13 DOI:10.1108/acmm-01-2024-2954
Feng Zhou, S. S. Lu, B. Jiang, R.G. Song
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Abstract

Purpose

This study aims to study the formation mechanism of micro-arc oxidation (MAO) coating on AZ31 magnesium alloy and how the annealing process affects its corrosion resistance.

Design/methodology/approach

This study involved immersion experiments, electrochemical experiments and slow strain rate tensile experiments, along with scanning electron microscopy, optical microscopy observation and X-ray diffraction analysis.

Findings

The findings suggest that annealing treatment can refine the grain size of AZ31 magnesium alloy to an average of 6.9 µm at 300°C. The change in grain size leads to a change in conductivity, which affects the performance of MAO coatings. The MAO coating obtained by annealing the substrate at 300°C has smaller pores and porosity, resulting in better adhesion and wear resistance.

Originality/value

The coating acts as a barrier to prevent corrosive substances from entering the substrate. However, the smaller pores and porosity reduce the channels for the corrosive solution to pass through the coating. When the coating cracks or falls off, the corrosive medium and substrate come into direct contact. Smaller and uniform grains have better corrosion resistance.

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热轧 AZ31 镁合金退火处理对 MAO 涂层性能和抗应力腐蚀性能的影响
本研究旨在研究 AZ31 镁合金微弧氧化(MAO)涂层的形成机理,以及退火处理如何影响其耐腐蚀性。本研究涉及浸泡实验、电化学实验和慢应变速率拉伸实验,以及扫描电子显微镜、光学显微镜观察和 X 射线衍射分析。研究结果研究结果表明,退火处理可使 AZ31 镁合金的晶粒尺寸在 300°C 时细化至平均 6.9 µm。晶粒尺寸的变化会导致电导率的变化,从而影响 MAO 涂层的性能。通过在 300°C 下对基材进行退火处理而获得的 MAO 涂层具有更小的孔隙和气孔率,因而具有更好的附着力和耐磨性。然而,较小的孔隙和多孔性减少了腐蚀性溶液通过涂层的通道。当涂层开裂或脱落时,腐蚀介质和基体就会直接接触。小而均匀的颗粒具有更好的耐腐蚀性。
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来源期刊
Anti-corrosion Methods and Materials
Anti-corrosion Methods and Materials 工程技术-冶金工程
CiteScore
2.80
自引率
16.70%
发文量
61
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.
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