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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Nitrogen and Sensitization on the Microstructure and Pitting Corrosion Behavior of AISI Type 316LN Stainless Steels
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Effect of Nitrogen and Sensitization on the Microstructure and Pitting Corrosion Behavior of AISI Type 316LN Stainless Steels

机译：氮和敏化作用对AISI 316LN不锈钢的组织和点蚀行为的影响

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摘要

High-nitrogen stainless steels (SS) are receiving increased attention because of the advantages of their strength over the SS with nominal composition. However, they are susceptible to dichromium nitride (Cr_2N) precipitation during thermal exposure between 873 and 1323 K resulting in sensitization and subsequent intergranular corrosion. Round tensile specimens of AISI type 316LN SS, with three different nitrogen content 0.07, 0.14, and 0.22 wt.% in mill-annealed and sensitized (973 K for 24 h) condition were studied for their pitting corrosion behavior. The results of the potentiodynamic anodic polarization studies were correlated with the results obtained using electrochemical impedance spectroscopy (EIS) technique. Critical pitting potential (E_(pp)) increased with increasing nitrogen content but the same was found to decrease on aging. The parameters indicating passive film stability measured by EIS revealed faster passive film dissolution as indicated by low polarization resistance, in sensitized condition and vice-versa in mill-annealed condition. The EIS results correlated well with the variation in the respective E_(pp) obtained from the potentiodynamic polarization diagrams.
机译：高强度不锈钢（SS）的强度优于标称成分的SS，因此受到越来越多的关注。但是，它们在873和1323 K之间的热暴露期间易受氮化铬（Cr_2N）沉淀的影响，从而导致敏化和随后的晶间腐蚀。研究了AISI 316LN SS型圆形拉伸试样，在轧制退火和敏化（973 K，24小时）条件下具有三种不同的氮含量分别为0.07、0.14和0.22 wt。％的点腐蚀行为。电位动力学阳极极化研究的结果与使用电化学阻抗谱（EIS）技术获得的结果相关。临界点蚀电位（E_（pp））随着氮含量的增加而增加，但随着老化而降低。通过EIS测量表明钝化膜稳定性的参数表明，在敏化条件下，低极化电阻表明钝化膜溶解更快，而在轧制退火条件下，则反之亦然。 EIS结果与从电位动力学极化图获得的各个E_（pp）的变化密切相关。

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