28CrMo钢Ni-P非晶态合金镀层在模拟气田水溶液中的耐蚀性能  

Corrosion Resistance of Electrodeposited Amorphous Nickel Phosphorous Alloy Coating on Drill Pipe Chromium-Molybdenum Alloy Steel in Simulated Gas-Field Water Solution

作　　者：陈孝文[1] 朱毅科 李森林[1] 邵登全 石霜霜[1] 吴俊杰 

机构地区：[1]西南石油大学材料科学与工程学院,四川成都610500 [2]四川华工石油钢管有限责任公司,四川成都610500

出　　处：《材料保护》2013年第9期4-6,16,共4页Materials Protection

基　　金：四川省高等学校油气田材料重点实验室资助项目(12YQT028)

摘　　要：Ni-P非晶态镀层性能优异,而在钻杆用钢表面电沉积了Ni-P非晶态镀层的报道较少。在钻杆用28CrMo钢表面电沉积了4种Ni-P非晶态合金镀层,采用极化曲线、阻抗谱及腐蚀速率测试等方法研究了4种镀层在模拟气田水溶液中的耐蚀性能,并与基材的耐蚀性进行了对比。结果表明:Ni-P非晶态合金镀层在模拟气田水溶液中的耐腐蚀性能随镀液中Ni含量增加及P含量减少而增强;适量稀土镧能提高Ni-P非晶态合金镀层的耐蚀性能;Ni-P非晶态合金镀层在模拟气田水溶液中的腐蚀方式为点腐蚀,随着腐蚀时间的增加,耐蚀性先增大后减小;Ni-P非晶态合金镀层具有优异的耐蚀性能,在模拟气田水溶液中的腐蚀机理为胞状颗粒间的针孔状腐蚀。Four kinds of amorphous Ni-P alloy coating with different P content were electrodeposited on the surface of 28CrMo steel( a drill pipe steel). The polarization curves,electrochemical impedance spectra,and corrosion rate of as-plated Ni-P alloy coatings in simulated gas-field water solution were measured,and their corrosion resistance was evaluated. Results indicated that the corrosion resistance of amorphous Ni-P alloy coatings in the simulated gas-field water solution tended to increase with declining P content,while the introduction of a proper amount of rare earth element La helped to improve the corrosion resistance of Ni-P alloy coating. In the simulated gas-field water solution,as-plated Ni-P alloy coating was dominated by pitting, i. e.,pinhole-like corrosion among cellular grains in terms of the corrosion mechanism. In one word,as-plated amorphous Ni-P alloy coating had good corrosion resistance in simulated gas-field water solution.

关 键 词：电沉积 Ni—P非晶态合金镀层 28CrMo钢 模拟气田水溶液 稀土镧 耐蚀性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]