PLASMA–BASED LOW–ENERGY NITROGEN ION IMPLANTATION OF 2Cr13 MARTENSITIC STAINLESS STEEL USED IN PUMPS AND VALVES

doi:10.3724/SP.J.1037.2011.00227

Acta Metall Sin

2011, Vol. 47

Issue (12): 1490-1494 DOI: 10.3724/SP.J.1037.2011.00227

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PLASMA–BASED LOW–ENERGY NITROGEN ION IMPLANTATION OF 2Cr13 MARTENSITIC STAINLESS STEEL USED IN PUMPS AND VALVES

LEI Mingkai, WANG Kesheng, OU Yi Xiang, ZHANG Lei

Surface Engineering Laboratory, School of Materials Science and Engineering, Dalian University of Technology,
Dalian 116024

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LEI Mingkai WANG Kesheng OU Yi Xiang ZHANG Lei. PLASMA–BASED LOW–ENERGY NITROGEN ION IMPLANTATION OF 2Cr13 MARTENSITIC STAINLESS STEEL USED IN PUMPS AND VALVES. Acta Metall Sin, 2011, 47(12): 1490-1494.

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Abstract The 2Cr13 martensitic stainless steel used in pumps and valves has been 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 2Cr13 stainless steel has a thickness range of 10—12 μm. The modified layer consists of monophase and has a high supersaturated nitrogen concentration up to 35%—40% (atomic fraction). The microhardness of the ε–Fe₂₋₃N phase layer was measured to be 15.7 GPa, and the increased wear resistance of the modified layer was obtained on a ball on disctribometer 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/cm², 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 2Cr13 martensitic stainless steel provided an opportunity of combined improvement in wear and corrosion resistance for use in pumps and valves.

Key words: plasma–based low–energy nitrogen ion implantation 2Cr13 martensitic stainless steel wear resistance corrosion resistance

Received: 11 April 2011

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Supported by National Natural Science Foundation of China (No.50725519)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00227 OR https://www.ams.org.cn/EN/Y2011/V47/I12/1490

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