Mitigation of copper corrosion in the presence of an organic oxyanion through microstructural optimization

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

Corrosion Science Pub Date : 2025-09-25 DOI:10.1016/j.corsci.2025.113358

Amit Acharjee , Giorgia Ghiara , Iwona B. Beech , Matthew W. Fields , Roberta Amendola

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Abstract

This investigation aimed to determine whether altering metal microstructure by introducing special grain boundaries through annealing could reduce the corrosion damage observed in the presence of pyruvate. Oxygen-free pure copper coupons were annealed at 325°C, 475°C and 950°C for varying durations to optimize the formation of ∑3 special boundaries. Samples annealed at 475°C for 30 min had the highest yield of such boundaries, thus, were selected for testing. Annealed and as-received, untreated, copper specimens were exposed under stagnant conditions to an aqueous oxic solution of sodium pyruvate for 30 days. Microscopy, spectroscopy, and electrochemical methods were employed to characterize the specimens prior to and following pyruvate exposure. Pyruvate caused localized corrosion of copper seen as micro pitting, irrespective of the specimen treatment. Reduced pitting severity and a decrease in the corrosion rate by 32 % were recorded for annealed coupons when compared to as-received ones. It is proposed that the difference in thickness and morphology of the oxide layer between annealed and as-received coupons, evidenced through electrochemical techniques, is the likely contributor to the improved corrosion resistance of annealed coupons.

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通过微观结构优化减少有机氧阴离子存在下铜的腐蚀

本研究旨在确定通过退火引入特殊晶界来改变金属微观结构是否可以减少在丙酮酸存在下观察到的腐蚀损伤。对无氧纯铜试样在325℃、475℃和950℃下进行不同时间的退火，优化∑3特殊边界的形成。在475°C下退火30 min的样品具有最高的边界产率，因此选择进行测试。经退火和接收后，未经处理的铜标本在停滞条件下暴露于丙酮酸钠的氧水溶液中30天。显微镜、光谱学和电化学方法被用来表征丙酮酸暴露前后的标本。丙酮酸对铜的局部腐蚀表现为微点蚀，与试样处理无关。与接收的试样相比，退火试样的点蚀严重程度降低，腐蚀速率降低了32% %。通过电化学技术证明，退火后和未退火时氧化层的厚度和形貌的差异可能是退火后合金耐腐蚀性提高的原因。

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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.