| 引用本文: | 潘东，党理，杨屹，王均.低温氮化对1Cr11不锈钢耐双相流冲刷腐蚀性能的影响[J].中国表面工程,2015,28(5):37~43 |
| PAN Dong, DANG Li, YANG Yi, WANG Jun.Effects of Low Temperature Nitriding Process on Errosion-Corrosion Resistance of 1Cr11 Stainless Steel[J].China Surface Engineering,2015,28(5):37~43 |
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| 摘要: |
| 为研究低温盐浴氮化提升马氏体钢耐冲刷腐蚀的机理，在410、430和450 ℃不同温度下对1Cr11不锈钢盐浴氮化8 h。通过光学显微镜，X射线衍射分析仪(XRD)，显微硬度仪对渗氮层的渗氮层厚度、显微组织及显微硬度进行研究，通过电化学工作站循环伏安法和双相流冲刷腐蚀模拟试验研究不锈钢耐蚀性。结果表明，渗氮层包括化合物层和扩散层，化合物层主要由N的过饱和固溶体αN和含氮化合物εFe23N组成。渗氮层显微硬度约为基体硬度3倍；循环伏安法表明渗氮层和基体在NaCl溶液中均发生钝化，但渗氮层表面钝化膜在溶解后具有自我修复能力，抗点蚀能力好。经过120 h的冲刷腐蚀模拟试验，氮化样品质量损失速率远低于未处理试样的质量损失速率，氮化可以有效提升试样的耐冲蚀性能。 |
| 关键词: 不锈钢 盐浴氮化 冲刷腐蚀 循环伏安法 |
| DOI：10.11933/j.issn.1007-9289.2015.05.006 |
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| Effects of Low Temperature Nitriding Process on Errosion-Corrosion Resistance of 1Cr11 Stainless Steel |
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PAN Dong, DANG Li, YANG Yi, WANG Jun
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School of Manufacturing Science and Engineering, Sichuan University
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| Abstract: |
| To study the mechanism of erosion corrosion resistance of martensitic stainless steel by low temperature bath nitriding. 1Cr11 stainless steel was nitrided in salt bath at 410, 430 and 450℃ for 8 h. The thickness, microstructure and microhardness of the nitrided case were detected through the optical microscope, XRD instrument and a microhardness tester. The corrosion resistance of stainless steel was tested through electrochemical workstation cyclic voltammetry (CV) and multiphase flow erosion corrosion simulation test. The results show that the nitrided case consists of a compound layer and a diffusion layer. The compound layer consists mainly of the solid solution of nitrogen (αN) and nitrogen compound (εFe23N). The microhardness of the nitrided case is about 3 times harder than that of the substrate. CV shows that the nitrided case and the substrate passivate in NaCl solution, however after dissolution, selfrepairing ability and stronger pitting resistance are found in the passive film transformed from nitrided case. After erosion corrosion simulation test for 120 h, the nitrided sample mass loss rate is far slow than that of the untreated one, showing that the erosion corrosion resistance of 1Cr11 can be significantly improved by low temperature bath nitriding. |
| Key words: stainless steel salt bath nitriding errosioncorrosion cyclic voltammetry |
