35CrMoA激光淬火/渗氮层耐蚀性研究
Study on Corrosion Resistance of 35CrMoA Steel in Laser Quenching / Nitrided Layer
程义远, 王 勇, 韩 彬, 李美艳
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作者单位：中国石油大学 (华东）机电工程学院, 山东 东营 257061
中文关键字：激光淬火； 渗氮； 显微组织； 耐蚀性
英文关键字：laser quenching; nitriding; microstructure; corrosion resistance
中文摘要：对35CrMoA钢进行激光淬火-渗氮复合处理，采用XRD、SEM、TEM及M352腐蚀系统研究了激光淬火/渗氮层的组织、相组成、耐蚀性能，并与气体渗氮层对比。结果表明，两种渗氮层均由ε相、γ′相及Cr2N相组成。激光淬火/渗氮白亮层中ε-Fe3N含量较高，而脆硬的ζ-Fe2N相及Fe2O3含量较低，白亮层厚度由气体渗氮层的25 μm降为激光淬火/渗氮的12 μm，其致密度增加；激光淬火/渗氮层中Ecorr值较气体渗氮的提高，自腐蚀电流由气体渗氮的57.68 μA/cm2减小到激光/渗氮的3.166 μA/cm2，其耐蚀性提高。
英文摘要：Through composite treatment of laser quenching and nitrided on 35CrMoA steel, the influence of laser surface pretreatment on microstructure, phase composition and corrosion resistance of the nitrided layer were studied by XRD, SEM, TEM and M352 electrochemistry corrosion system. The results show that the composite nitrided layer is composed of ε, γ' and Cr2N and so on. The content of ε-Fe3N is higher in the laser quenching/nitrided white layer, while the content of the brittle ζ-Fe2N and Fe2O3 is lower than that of the gas nitrided layer, the depth of white layer decreasing from 25 μm of gas nitrided layer to 12 μm of composite nitrided layer resulting in the increase of density. Ecorr of laser quenching/nitriding layer improves comparing with gas nitriding while Icorr decreases from 57.68 μA/cm2 of composite nitriding layer to 3.166 μA/cm2 of gas nitriding layer. As a result, its corrosion resistance improves significantly．