Effects of environmental factors on corrosion behavior of aluminum,Materials and Corrosion

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Effects of environmental factors on corrosion behavior of aluminum
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-05-28 , DOI: 10.1002/maco.202011676
Jungin Jung ₁ , Sekwon Oh ₂ , Hyuksang Kwon ₁

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Aluminum, used as a material for heat exchangers in air conditioners, often has problems of leakage of refrigerant on the Al surface due to corrosion. The problems originate from pitting corrosion of the Al in an external environment. To understand corrosion problems, it is necessary to study the corrosion behavior of Al in various environments. In this study, the effects of environmental factors on the corrosion behavior of Al were studied by the surface analysis and electrochemical testing in 3.5 wt% NaCl solutions, with changes of dissolved oxygen, temperature, and concentration of Cl⁻ and S ions. Among the external environmental factors, the presence of oxygen and the increase of Cl⁻ ion concentration do not significantly affect the corrosion potential of Al, leading to an increase of only 1.1 and 6 times, respectively. There was a significant decrease in the corrosion resistance of Al, approximately 40 and 800 times, respectively, with the increase of concentration of S and temperature.

中文翻译：

环境因素对铝腐蚀行为的影响

铝用作空调中的热交换器的材料，由于腐蚀，经常会出现制冷剂在铝表面泄漏的问题。问题源于外部环境中的铝点蚀。为了理解腐蚀问题，有必要研究Al在各种环境下的腐蚀行为。在这项研究中，通过在表面分析和3.5重量％的NaCl溶液的电化学测试研究了对Al的腐蚀行为的环境因素的影响，溶解氧，温度，和Cl的浓度的变化^-离子和硫离子。间的外部环境因素，氧气的存在和Cl的增加^-离子浓度不会显着影响Al的腐蚀潜能，分别仅增加1.1倍和6倍。随着S浓度和温度的升高，Al的耐腐蚀性显着下降，分别降低了约40倍和800倍。

更新日期：2020-05-28

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