Abstract
The 2Crl3 martensitic stainless steel used in pumps and valves was modified by plasma-based low-energy nitrogen ion implantation at a processing temperature of 450℃for a treatment time of 4 h.The modified layer on the 2Crl3 stainless steel had a thickness range of 10 12μm.The modified layer consisted of monophase and has a high supersaturated nitrogen concentration up to 35%—40%(atomic fraction).The microhardness of thee-Fe_(2-3)N phase layer was measured to be 15.7 GPa,and the increased wear resistance of the modified layer was obtained on a ball on disc tribometer with a decreased friction coefficient from 1.0 of the original stainless steel to 0.85.A typical course from self-passivation to pitting corrosion of the modified layer in 3.5%NaCl solution was observed with a corrosion potential of—185 mV(vs SCE),a passive current density of 10~(-1)μA/cm~2, and a pitting potential of—134 mV(vs SCE).The pitting corrosion resistance of the modified layer was improved in comparison with that of the original stainless steel with non anodic passivation.It was found that the plasma-based low-energy nitrogen ion implantation of 2Crl3 martensitic stainless steel could meet the wear and corrosion resistance requirement for use in pumps and valves.
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