论文部分内容阅读
采用等离子体基低能氮离子注入技术,在450℃,4 h改性处理核电站泵阀零部件用2Cr13马氏体不锈钢,获得了深度为10—12μm的改性层,超高氮过饱和浓度为35%—40%(原子分数),由hcp结构的ε-Fe_(2-3)N相组成.改性层的硬度最大值为15.7 GPa,球-盘式摩擦学实验测定的改性层摩擦系数由原始不锈钢的1.0减至0.85,耐磨性显著提高.在3.5%NaCl溶液中,改性层的阳极极化曲线由原始不锈钢的活化溶解转化为自钝化-孔蚀击穿特征,自腐蚀电位增加至-185 mV(us SCE),维钝电流密度为10~(-1)μA/cm~2,孔蚀击穿电位为-134 mV(vs SCE),抗孔蚀性能明显改善,表面改性2Cr13马氏体不锈钢满足泵阀零部件耐磨损抗腐蚀的需求.
Using plasma-based low-energy nitrogen ion implantation technology, 2Cr13 martensitic stainless steel was modified at 450 ℃ for 4 h to obtain the modified layer with depth of 10-12μm. The super-high nitrogen supersaturated concentration was 35% -40% (atomic fraction), which is composed of the hcp structure of ε-Fe_ (2-3) N phase.The hardness of the modified layer is 15.7 GPa, the friction of the modified layer determined by the ball-disc tribological experiment Coefficient decreased from 1.0 to 0.85 in the original stainless steel, the wear resistance increased significantly.In the 3.5% NaCl solution, the anodic polarization curve of the modified layer was changed from the activation dissolution of the original stainless steel to the self-passivation-pitting erosion characteristic, since The corrosion potential increases to -185 mV (us SCE), the steady-state current density is 10-1 μA / cm 2, and the pitting breakdown potential is -134 mV (vs SCE) Surface modification 2Cr13 martensitic stainless steel valve components to meet the needs of wear-resistant anti-corrosion.