Galvanic corrosion behavior of AZ91D alloy / 45 steel couple under magnetic field

IF 13.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Magnesium and Alloys Pub Date : 2024-09-01 DOI:10.1016/j.jma.2023.03.007

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Abstract

Galvanic corrosion behavior of AZ91D alloy / 45 steel couple in 3.5 wt.% NaCl solution under 0, 0.2 and 0.4 T magnetic field were studied by microstructure observation, immersion test and electrochemical measurement. The mixed potential theory was used to estimate the galvanic current density and the mixed potential of the galvanic corrosion between AZ91D alloy and 45 steel. The results indicated that magnetic field could accelerate the corrosion of AZ91D alloy, and impede the corrosion process of 45 steel. The effect of magnetic field on corrosion sensibility and corrosion rate of these two alloys increased as the intensity rising. The galvanic corrosion rate of the couple was accelerated by magnetic field. With the magnetic field intensity rising, the galvanic corrosion sensibility and corrosion rate of the couple increased. The effects of magnetic field on the galvanic corrosion performance of the couple and the corrosion behavior of AZ91D alloy and 45 steel were due to the appearance of field gradient force and magnetohydrodynamic (MHD) force. The mixed potential theory has a certain accuracy to estimate the E_couple and i_couple values in this work.

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磁场作用下AZ91D合金/45钢偶的电偶腐蚀行为

通过微观结构观察、浸泡试验和电化学测量，研究了 AZ91D 合金和 45 钢在 3.5 wt.% 的 NaCl 溶液中，在 0、0.2 和 0.4 T 磁场下的电化学腐蚀行为。利用混合电位理论估算了 AZ91D 合金和 45 钢之间的电化学腐蚀的电流密度和混合电位。结果表明，磁场能加速 AZ91D 合金的腐蚀，阻碍 45 钢的腐蚀过程。磁场对这两种合金的腐蚀敏感性和腐蚀速率的影响随着磁场强度的增加而增加。磁场加速了这两种合金的电化学腐蚀速率。随着磁场强度的增加，这对合金的电化学腐蚀敏感性和腐蚀速率也随之增加。磁场对耦合体电化学腐蚀性能以及 AZ91D 合金和 45 钢腐蚀行为的影响是由于磁场梯度力和磁流体动力学（MHD）力的出现。在这项工作中，混合电势理论对 Ecouple 和 icouple 值的估算具有一定的准确性。

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来源期刊

Journal of Magnesium and Alloys Engineering-Mechanics of Materials

CiteScore

20.20

自引率

14.80%

发文量

审稿时长

59 days

期刊介绍： The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.