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《Ordnance Material Science and Engineering》 2018-06
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Microstructure and corrosion behavior of pure Ni powder coating on stainless steel surface by laser cladding

YANG Jian;XIE Yanxiang;Yulin Engineering Technology Research Center for Frontier Materials,College of Energy Engineering,Yulin University;Shaanxi Key Laboratory of Surface Engineering and Remanufacturing,Xi′an University of Arts and Science;  
The pure Ni powder was deposited on the surface of 316L stainless steel with fiber laser.The microstructure and phase composition of the coating were analyzed by SEM,EDS and XRD.The corrosion behavior of coating and substrate in 3.5%NaCl solution was investigated by using electrochemical method.The results show that the surface of the coating is very smooth and the coating has a dense structure bonded well with the substrate.The coating consists ofγ(Ni,Fe)solid solution andFrom the top to bottom,the morphology of microstructure is equiaxed crystal,columnar crystal and cellular crystal in turn.The interface zone is planar crystal,the self-corrosion potential of coating is-0.13 V and corrosion current density is 5.012×10-7A/cm2.Compared with the substrate,the self-corrosion potential shifts positively by 0.16 V and the corrosion density of coating decreases by 55.33%.The corrosion impedance modulus of coating is also significantly higher than that of substrate.The passivation film on the surface of coating has higher integrity without inclusion defects,which makes the initiation of pitting become more difficult and can reduce the rate of pitting,and Ni coating acts to protect the stainless steel substrate.
【Fund】: 国家自然科学基金(51601167;51861034);; 陕西省科技统筹重大项目(2016KTZDGY04-03;2018GY-129);; 陕西省教育厅专项科研计划项目(18JK0907)
【CateGory Index】: TG174.4
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