Preparation and antibacterial property of Cu containing functional gradient coating on stainless steel

doi:10.13251/j.issn.0254-6051.2023.02.041

Abstract

Abstract: In order to improve the wear resistance and antibacterial property of stainless steel, a functional gradient composite modified layer was prepared on AISI316 stainless steel by a modified active screen plasma nitriding (ASPN) technology that the pure copper punching plate was placed on the stainless steel punching plate as top cover of the active screen. The surface nitriding treatment of the AISI316 stainless steel was carried out at low temperature (430 ℃), and at the same time, a functional gradient composite modified coating consisting of Cu containing antibacterial deposition layer and S phase(supersaturated solid solution of nitrogen in austenite γ_N) hard support layer was formed on the surface. The microstructure, composition and phase structure of the composite modified coating were characterized by means of SEM, EDS, XRD. The microhardness and friction and wear properties of the substrate and composite modified layer were tested by microhardness tester and reciprocating friction and wear tester, and the antibacterial property was evacuated by antibacterial experiment in vitro using Staphylococcus aureus. The results show that when the bias voltage reaches 250 V, a composite modified coating composed of continuously distributed S phase diffusion layer and Cu containing deposition layer is formed. The maximum hardness of the modified coating reaches 928 HV0.05. When ground with Si₃N₄ small ball, the specific wear rate is about 57.76% lower than that of the substrate, which significantly improves the wear resistance of the stainless steel. The antibacterial test shows that the bactericidal rate of the composite modified coating reaches 98.5% after contacting with Staphylococcus aureus for 24 h. The functional gradient composite modified coating prepared by the improved active screen plasma nitriding technology can effectively improve the wear resistance and antibacterial property of the stainless steel.

Key words: stainless steel, active screen plasma nitriding, Cu containing functional gradient modified layer, wear resistance, antibacterial property

CLC Number:

Zheng Jiasheng, Huang Tianyang, Tian Linhai, Lin Naiming, Wang Zhenxia, Qin Lin. Preparation and antibacterial property of Cu containing functional gradient coating on stainless steel[J]. Heat Treatment of Metals, 2023, 48(2): 263-269.

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