Corrosion Behavior of Heat-Treated Fe-Based Shape Memory Alloys

IF 1.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials and Corrosion-werkstoffe Und Korrosion Pub Date : 2024-09-05 DOI:10.1002/maco.202414562

Pranav Vivek Kulkarni, Meet Jaydeepkumar Oza, Anna Igual-Munoz, Jean-Michel Sallese, Moslem Shahverdi, Christian Leinenbach, Stefano Mischler

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Abstract

The influence of various heat treatments on the corrosion behavior of a novel iron-based shape memory alloy (Fe-SMA), Fe-17Mn-6Si-10Cr-4Ni-1(V,C), used as prestressing elements in civil engineering was examined through electrochemical corrosion methods. SMAs were subjected to two different electrolytes: saturated Ca(OH)₂ solutions with and without chlorides to mimic the conditions in concrete. Two specific heat treatments were applied to the Fe-SMA, which resulted in a change in grain size and precipitation of secondary phases. Furthermore, conventional structural steel, B500B, was utilized as a reference material. The results reveal that the heat treatments did not significantly change the corrosion rates of these alloys in Ca(OH)₂ solution compared to B500B when chlorides were absent. However, the presence of chloride ions suppressed the passivity of B500B and promoted the localized corrosion (pitting and intergranular) of the Fe-SMAs, among which the solutionized alloy showed significantly higher resistance to the pitting. It was demonstrated that the heat treatments and, consequently, microstructural characteristics influence the pitting behavior of these alloys.

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热处理铁基形状记忆合金的腐蚀行为

通过电化学腐蚀方法研究了各种热处理对土木工程中用作预应力元件的新型铁基形状记忆合金（Fe-SMA）Fe-17Mn-6Si-10Cr-4Ni-1(V,C)腐蚀行为的影响。SMA 被置于两种不同的电解质中：含氯化物和不含氯化物的饱和 Ca(OH)2 溶液，以模拟混凝土中的条件。对铁-SMA 进行了两种特定的热处理，从而改变了晶粒大小并析出了次生相。此外，还使用了传统结构钢 B500B 作为参考材料。结果表明，与 B500B 相比，在 Ca(OH)2 溶液中没有氯离子时，热处理并没有显著改变这些合金的腐蚀速率。然而，氯离子的存在抑制了 B500B 的钝化，促进了铁-SMA 的局部腐蚀（点蚀和晶间腐蚀），其中固溶合金的抗点蚀能力明显更强。研究表明，热处理以及随之而来的微观结构特征会影响这些合金的点蚀行为。

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来源期刊

Materials and Corrosion-werkstoffe Und Korrosion 工程技术-材料科学：综合

CiteScore

3.70

自引率

11.10%

发文量

199

审稿时长

1.4 months

期刊介绍： Materials and Corrosion is the leading European journal in its field, providing rapid and comprehensive coverage of the subject and specifically highlighting the increasing importance of corrosion research and prevention. Several sections exclusive to Materials and Corrosion bring you closer to the current events in the field of corrosion research and add to the impact this journal can make on your work.