Corrosion and Volta potential evolution of high purity Mg treated in chloride solutions of bi-valent Cu, Mn, Ni, and Zn cations

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-09-26 DOI:10.1016/j.corsci.2025.113360

K.A. Yasakau , B. Vaghefinazari , N. Scharnagl , S. Lamaka , M.L. Zheludkevich

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引用次数: 0

Abstract

The corrosion resistance of magnesium-based materials is known to be highly sensitive to even trace amounts of noble impurities. In this study, the surface and electrochemical properties of high-purity magnesium (51 ppm Fe) (HPMg) treated in 1 mM chloride solutions of bivalent Cu, Mn, Ni, or Zn cations were investigated by AFM/SKPFM, H₂ evolution measurements, DC-polarization, SEM, and XPS. The goal was to understand the potential effects of galvanic replacement induced by the respective cations. The cathodic kinetics drastically increased on HPMg samples treated in Cu solutions. Additionally, the Volta potential difference (VPD) of HPMg increased following treatment in Cu and Zn solutions. Furthermore, the VPD dropped after subsequent exposure to NaCl, which was attributed to the loss of galvanic coupling between magneisum and the noble deposits formed in a galvanic replacement reaction. In contrast, no significant VPD changes were observed on HPMg surface for Mn and Ni treatments. XPS analysis confirmed that Cu and Zn metals/oxides and Mn and Ni hydroxides were displaced by the corrosion film formed on the HPMg after exposure to NaCl. The observed changes in surface properties and corrosion kinetics of HPMg were rationalized.

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高纯Mg在双价Cu， Mn， Ni和Zn阳离子氯化物溶液中的腐蚀和伏特电位演变

众所周知，镁基材料的耐腐蚀性对微量的贵金属杂质也非常敏感。在本研究中，采用AFM/SKPFM、析氢测量、直流极化、SEM和XPS研究了高纯度镁（51 ppm Fe）（HPMg）在1 mM二价Cu、Mn、Ni或Zn阳离子氯化物溶液中处理后的表面和电化学性能。目的是了解由各自阳离子诱导的电替代的潜在影响。在Cu溶液中处理的HPMg样品的阴极动力学显著提高。此外，在Cu和Zn溶液中处理后，HPMg的伏特电位差（VPD）增加。此外，在NaCl处理后，VPD下降，这是由于镁与在电替换反应中形成的贵金属沉积物之间失去了电偶联。相比之下，Mn和Ni处理后HPMg表面VPD没有明显变化。XPS分析证实，Cu、Zn金属氧化物和Mn、Ni氢氧化物被NaCl作用后HPMg表面形成的腐蚀膜置换。对观察到的表面性能和腐蚀动力学的变化进行了合理化。

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

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.