激光熔覆Ni+Cr_2O_3复合涂层的耐蚀性  

Corrosion resistance of laser cladding Ni+Cr_2O_3 composite coating

作　　者：张大伟[1] 雷廷权[2] 王辉东[3] 白波[3] 

机构地区：[1]大庆石油学院石油机械系,黑龙江安达151400 [2]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001 [3]大庆油田有限责任公司第六采油厂,黑龙江大庆163114

出　　处：《大庆石油学院学报》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)

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.

关 键 词：激光熔覆 Ni+Cr2O3复合涂层 耐蚀性 油田 防腐 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TE980.5[金属学及工艺—金属学]