摘要
研究了激光搭接熔覆Ni+Cr2 O3复合涂层在 0 .5mol/LH2 SO4 +0 .5mol/LNaCl水溶液中的电化学行为 .试验表明Cr2 O3粒子在激光熔池中发生了完全溶解 ,涂层具有胞状枝晶组织特征 .激光熔覆Ni+Cr2 O3复合涂层比单一熔覆Ni合金涂层和 2Cr13马氏体不锈钢基材具有更低的维钝电流密度和更宽的钝化区范围 ,明显改善了在该腐蚀介质中的抗点蚀能力 .
The electrochemical behavior of laser\|clad Ni+Cr 2O 3 composite coating with overlapping tracks under 0.5 mol/L H2SO4 + 0.5 mol/L NaCl solution have been studied. Test results show that Cr 2O 3 particles have a complete dissolution in laser melt pools, which provides its coating with a feature of cellular dendritic structure. A lower passivate current density and a wider passivation region were formed in laser-clad Ni+Cr 2O 3 composite coating compared with those of single cladded Ni alloy and 2Cr13 substrate, resulting in an obvious improvement on pit corrosion resistance in the corrosive medium.
出处
《大庆石油学院学报》
CAS
北大核心
2000年第3期63-66,共4页
Journal of Daqing Petroleum Institute
基金
中国石油天然气集团公司创新基金!项目 ( 95- 12 5)
关键词
激光熔覆
Ni+Cr2O3复合涂层
耐蚀性
油田
防腐
laser cladding
Ni+Cr 2O 3 composite coating
electrochemical characteristic
corrosion resistance
