激光熔敷镍基碳化钨的腐蚀磨损行为

Corrosive Wear Behaviors of Laser Cladding Layer of Ni-base WC Alloy

测定了Ni60＋20％WC合金激光熔敷层的腐蚀磨损性能，用扫描电镜研究了冲击速度和介质浓度对腐蚀磨损表面形貌的影响。结果表明，激光熔敷合金层的腐蚀磨损速率随冲击速度V和硫酸浓度C的提高而增大，符合W＝0．0287V2．087＋3．932V0．436C0．331V0．316的定量关系。其磨损机制为犁削磨损，腐蚀机制为均匀腐蚀和坑穴腐蚀，磨损对腐蚀有明显的激化作用。

The Corrosive wear properties of Ni60 +20%WC alloy coatings by laser cladded process have been measured and wear-corrosion surface morphologies in diffirent impact velocities and sulphuric-acid concentrations have been studied by SEM. The results show that the wear-corrosion rates of the coatings are increased with the increase of impact velocity or media concentration and the quantitative relation among wear-corrosion rateW,impact velocity V and media concentration C is W = 0. 0287V2.087 + 3. 932V0.436C0.331V0. 316. The wear mechanism of the coatings is the microploughing wear and the corrosion mechanisms are well-distributed corrosion and pitting corrosion.