Investigating the role of Al2Ca particles in the corrosion behavior of AZX311 Mg alloy in chloride and sulfate electrolytes

IF 5.6 3区材料科学 Q1 ELECTROCHEMISTRY

Electrochimica Acta Pub Date : 2025-10-09 DOI:10.1016/j.electacta.2025.147546

Hafiz Muhammad Rehan Tariq , Umer Masood Chaudry , Zeeshan Asif , Saira Niaz , Ameeq Farooq , HongBiao Dong , Tea-Sung Jun

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Abstract

The corrosion behavior of hot-rolled AZX311 magnesium (Mg) alloy was studied in sodium chloride and sodium sulfate solutions (0.15 M and 0.25 M concentrations) at 30 °C and 50 °C. Microstructural analysis of the hot-rolled alloy revealed uniformly distributed Al₂Ca precipitates within the α-Mg matrix. Electrochemical tests revealed higher corrosion rates in sodium chloride, attributed to the chloride-induced breakdown of the protective magnesium hydroxide film. Corrosion accelerated with increasing temperature and concentration, with the highest rate (4.14 millimeters per year) observed in 0.25 M sodium chloride at 50 °C, accompanied by severe localized attack in hydrogen evolution analysis. Moreover, the presence of Al₂Ca precipitates contributed to the stabilization of the passive surface film in sulfate-containing solutions. In contrast, these precipitates acted as sites for galvanic coupling with the α-Mg matrix, thereby intensifying localized corrosion processes, particularly under elevated temperatures within chloride-containing environments.

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Al2Ca颗粒在AZX311镁合金在氯化物和硫酸盐电解质中腐蚀行为中的作用研究

研究了热轧AZX311镁合金在nacl溶液（0.15 M和0.25 M）和硫酸钠溶液（30℃和50℃）中的腐蚀行为。热轧合金的显微组织分析表明，α-Mg基体内均匀分布有Al2Ca析出物。电化学测试表明，氯化钠的腐蚀速率更高，这是由于氯化物引起的氢氧化镁保护膜的击穿。随着温度和浓度的升高，腐蚀加速，在50°C的0.25 M氯化钠中观察到最高的速率（每年4.14毫米），并伴有严重的局部腐蚀。此外，在含硫酸盐溶液中，Al2Ca沉淀的存在有助于钝化表面膜的稳定。相反，这些沉淀充当了与α-Mg基体电偶联的位置，从而加剧了局部腐蚀过程，特别是在含氯化物环境中的高温下。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.