Surface evolution and corrosion behaviour of Cu-doped carbide-reinforced martensitic steels in a sulfuric acid solution
Surface evolution and corrosion behaviour of Cu-doped carbide-reinforced martensitic steels in a sulfuric acid solution
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DOI：
10.1038/s41529-021-00187-0
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发表时间：
2021-08
影响因子：
5.1
通讯作者：
K. Yamanaka;M. Mori;Kazuo Yoshida;Y. Onuki;S. Sato;A. Chiba
中科院分区：
文献类型：
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作者：
K. Yamanaka;M. Mori;Kazuo Yoshida;Y. Onuki;S. Sato;A. Chiba
在不同的淬火温度下制备了具有多种碳化物析出物的掺铜马氏体钢（Fe–（13, 16）Cr–3W–2Cu–1C）（质量％），并通过测量在0.5M H2SO4溶液中浸泡期间的失重来检查其腐蚀行为。在较高淬火温度下制备的合金样品获得较低的重量损失和腐蚀速率。所有含有大量溶解铬物质的样品均观察到表面铜富集。此外，较高温度淬火不仅减少了M23C6碳化物的含量，而且通过增强表面Cu积累，降低了碳化物相与马氏体基体之间的局部电化学电位差，从而通过抑制组成相之间的微电偶腐蚀来提高耐腐蚀性。研究的钢的腐蚀行为与具有钝态氧化物表面膜的掺铜不锈钢和低合金钢的腐蚀行为显着不同，表明多种碳化物沉淀对其腐蚀行为有强烈影响。
Cu-doped martensitic steels (Fe–(13, 16)Cr–3W–2Cu–1C) (mass%) with multiple carbide precipitates were prepared at different quenching temperatures, and their corrosion behaviours were examined by measuring the weight loss during immersion in a 0.5 M H2SO4solution. Lower weight losses and corrosion rates were obtained for the alloy samples prepared at higher quenching temperatures. Surface Cu enrichment was observed for all specimens with a large fraction of dissolved Cr species. Moreover, quenching from higher temperatures not only reduced the amount of M23C6carbide but also decreased the local electrochemical potential difference between the carbide phase and the martensitic matrix via enhanced surface Cu accumulation, thus increasing corrosion resistance by suppressing microgalvanic corrosion between the constituent phases. The corrosion behaviour of the studied steels was remarkably different from those of the Cu-doped stainless and low-alloy steels with passive oxide surface films, suggesting the strong effect of multiple carbide precipitates on their corrosion behaviour.