摘要
研究了经高速火焰喷涂(HVOF)的316不锈钢WC-Co涂层在锌液中的腐蚀行为,包括腐蚀速度、界面组织形貌和成分的变化。结果表明,WC-Co涂层在锌液中的腐蚀表现为沿裂纹的腐蚀。涂层中的缺陷造成裂纹源,在锌液和热喷涂过程留下的残余热应力的作用下,发生裂纹扩展,形成沿裂纹的腐蚀。铬和铝的扩散能力都比锌强,在产生裂纹的初期,铬和铝将优先锌扩散到裂纹中。如果适当改善喷涂工艺,增加涂层的致密度,可以延长涂层的使用寿命。
The microstructure and corrosion behaviours of 316 stainless steel/ WC-Co coating by high velocity oxy-fuel(HVOF) in liquid zinc which contained small amount of aluminium(less than 0.2 wt%)were studied.Experiment results showed that cracks appeared in coating because that residual stress built up during thermal spraying caused by improper spraying conditions and liquid zinc acted on the defects in coating.We observed that not only zinc but also chromium and aluminium diffusion into the WC-Co coating along t...
出处
《航空材料学报》
EI
CAS
CSCD
2006年第4期56-60,共5页
Journal of Aeronautical Materials
基金
国家自然科学基金资助项目(50274005)
