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首页> 外文期刊>Corrosion science >Corrosion product analysis on crevice corroded Alloy-22 specimens
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Corrosion product analysis on crevice corroded Alloy-22 specimens

机译:缝隙腐蚀的Alloy-22试样的腐蚀产物分析

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摘要

Surface analytical techniques were applied to characterize corrosion products formed during the crevice corrosion of the Ni-Cr-Mo(W) Alloy-22 in 5 mol/L NaCl at 120 °C. Micro-Raman spectroscopy demonstrated the formation of polymeric molybdates within the crevice corroded region where intergranular corrosion dominated. The location and chemical speciation of the Mo and W species formed was investigated by Raman mapping. Crevice corrosion was found to propagate preferentially across the alloy surface rather than to penetrate deeply at localized sites, a feature which appears to be linked to the formation and build-up of polymeric molybdates.
机译:应用表面分析技术来表征在120℃下5 mol / L NaCl中Ni-Cr-Mo(W)合金22的缝隙腐蚀过程中形成的腐蚀产物。显微拉曼光谱表明,在晶间腐蚀占主导的缝隙腐蚀区域内形成了聚合钼酸盐。通过拉曼作图研究了形成的Mo和W物种的位置和化学形态。发现缝隙腐蚀优先在整个合金表面上传播,而不是在局部位置深处渗透,这一特征似乎与聚合钼酸盐的形成和积累有关。

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