盐浴渗氮对C110钢耐冲刷腐蚀性能的影响  

Effect of salt bath nitriding process on erosion corrosion resistance of C110 steel

作　　者：潘东[1] 林元华[2] 罗德福[3] 曾德志[2] 黄润波[1] 王均[1] 

机构地区：[1]四川大学制造科学与工程学院,四川成都610065 [2]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [3]西华大学材料科学与工程学院,四川成都610039

出　　处：《材料热处理学报》2013年第S2期216-220,共5页Transactions of Materials and Heat Treatment

摘　　要：为了提高C110钢的耐腐蚀和耐冲刷性能,对C110钢在430～640℃下进行盐浴渗氮,并通过XRD、SEM、OM和显微硬度仪研究了C110钢渗氮层的显微组织及渗氮温度对耐冲蚀性能的影响。结果表明:C110钢的渗氮层厚度随渗氮温度的升高而增加。渗氮温度为430℃时,渗氮层为Fe3N相和少量Fe4N相,580℃渗氮时,渗层出现少量Fe3O4相的疏松层,640℃渗氮时渗层厚度进一步增厚并存在较厚的疏松层。盐浴渗氮后试样的表面显微硬度提高2～3倍,耐冲蚀性能得到很好的改善,在430℃渗氮4 h的样品耐冲刷腐蚀性最好,质量损失不足未渗氮样的十分之一,随着渗氮温度的上升,耐冲刷性能逐渐降低。The C110 steel was surface-modified by salt bath nitriding at 430-640 ℃ in order to improve the corrosion and wear resistance. The effect of microstructure and nitriding temperature on erosion corrosion resistance of the nitrided layer was investigated by optical microscopy(OM),X-ray diffraction(XRD),scanning electron microscopy(SEM),and micro-hardness tester. The results show that the thickness of the nitrided layer increased with increasing nitriding temperature. The nitrided layer is consist of Fe3N and little Fe4N phases after nitriding at 430 ℃,and a small amount of the loose layer(Fe3O4) occurred in the nitrided layer at 580 ℃ and the loose layer became thicker after nitriding at 640 ℃. The surface microhardness of the samples after salt bath nitriding increased by 2-3 times than that of untreated one,and the erosion-corrosion resistance is also improved. The samples nitrided at 430 ℃ have the high microhardness and good corrosion-corrosion resistance,and the loss of mass is less than one-tenth of the untreated one. The microhardness and erosion-corrosion resistance of C110 steel decrease gradually as the temperature of nitriding increasing.

关 键 词：C110钢 盐浴渗氮 温度 冲刷腐蚀性能 

分 类 号：TG156.82[金属学及工艺—热处理]