WC对316 L钢表面的镍基激光熔覆涂层的性能影响研究

Effect of WC on the properties of Ni-based laser cladding coating on 316 L substrate

为了提升316L不锈钢的耐腐蚀性能,延长其在海洋环境中的使用寿命,讨论了激光熔覆技术在316L基材表面熔覆了纯Ni60涂层和WC+Ni60复合涂层的方法和效果。WC+Ni60复合涂层结合了WC颗粒的硬度和Ni60基体的韧性,具有更优异的综合性能,适用于对基材表面进行更高强度的保护。分别利用硬度仪、X射线衍射仪和电化学工作站对涂层检索和测试。结果表明,WC+Ni60复合涂层的平均截面硬度为719 HV,但各区域波动较大,同时熔覆层表面相较纯Ni60涂层更耐腐蚀,自腐蚀电位提高了0.12 V,自腐蚀电流密度降低了2.49×10^(-6)A/cm^(2)。本研究为后期制备耐海水腐蚀复合涂层提供了参考。

In order to improve the corrosion resistance of 316L stainless steel and prolong its service life in the marine environment,this paper discusses the method and effect of laser cladding technology on the surface of 316L substrate by cladding pure Ni60 coating and WC+Ni60 composite coating.The WC+Ni60 composite coating combines the hardness of WC particles and the toughness of Ni60 matrix,which has better comprehensive performance and is suitable for higher strength protection of the substrate surface.The coatings were retrieved and tested by hardness tester,X-ray diffractometer and electrochemical workstation,respectively.The results show that the average cross-sectional hardness of the WC+Ni60 composite coating is 719 HV,but the fluctuation in each region is large.At the same time,the surface of the cladding layer is more resistant to corrosion than the pure Ni60 coating.The self-corrosion potential is increased by 0.12 V,and the self-corrosion current density is reduced by 2.49×10^(-6)A/cm^(2).This study provides a reference for the later preparation of seawater corrosion resistant composite coatings.