摘要
研究了2种超音速火焰喷涂Ni基涂层(Ni60JH与Delelo50)和2种钢(1Cr18Ni9Ti与20钢)在液固两相流中,冲刷腐蚀的交互作用及其电化学行为,并对其冲刷腐蚀机制进行了探索性分析.研究结果表明,Ni60JH和Delelo50涂层的腐蚀质量损失率分别为基体材料的1/30和1/16,Ni60JH涂层的耐冲刷腐蚀性能比基体高15倍多,并与1Cr18Ni9Ti不锈钢相当,且Delelo50涂层的耐冲刷腐蚀性能比基体高5倍多.Ni60JH涂层主要以切削、犁削冲蚀磨损机理为主,而Delelo50涂层和2种钢主要以犁削、塑性变形、翻边冲蚀磨损机理为主.2种涂层和不锈钢在纯腐蚀时均处于钝化状态,在冲刷腐蚀时均处于活化溶解状态.
Two types of Ni-based alloy coatings(Ni60JH and Delelo50)were deposited by high velocity oxy-fuel (HVOF) spraying processes. Further explorations of the erosion-corrosion interaction of the coatings in liquid-solid duel-phase fluid were carried out. It was found that the corrosion weight loss rate of Ni60JH and Delelo 50 coatings was 1/30 and 1/16 that of the substrate respectively. The erosion-corrosion resistance of Ni60JH coatings was 15 times higher than that of the substrate, and the same as 1Crl8Ni9Ti stainless steel. The erosion-corrosion resistance of Delelo50 coatings was 5 times higher than that of the substrate. The erosion-wear mechanism of Ni60JH coatings is mainly cutting and plowing; and that of Delelo50 coatings and two kinds of steel is mainly plowing and plastic distortion. Two types of Ni-based alloy coatings and 1Crl8Ni9Ti are always in passive state at pure corrosion and in active-dissolve state at erosion-corrosion.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2003年第11期1150-1153,1158,共5页
Journal of Xi'an Jiaotong University
基金
西安交通大学科学研究基金资助项目
关键词
超音速火焰喷涂
NI基合金涂层
冲刷腐蚀
电化学
Electrochemical corrosion
Erosion
Scanning electron microscopy
Sprayed coatings
Surface topography
