Ni-W-P镀层耐地下深层高盐卤水腐蚀性能

Corrosion Behavior of Electroless and Electroplated Ni-W-P Coatings in High Salty Brine of Deep Underground

为了探讨Ni-W-P合金镀层耐地下深层高盐卤水的腐蚀性能及机理,在N80钢表面分别化学镀和电沉积Ni-W-P合金层。采用动电位极化曲线和静态全浸腐蚀试验研究了2种镀层在地下深层高盐卤水中不同环境下的腐蚀行为;利用SEM和EDS分析了2种Ni-W-P镀层腐蚀前后的表面形貌和成分。结果表明:2种Ni-W-P镀层的腐蚀电位均比N80钢基体的高,对N80钢基体形成了阴极保护;2种Ni-W-P镀层的腐蚀都很慢,是一种性能优异的N80钢耐蚀保护镀层。

Electroless and electroplated Ni-W-P coatings were prepared on N80 steel substrate.The corrosion behavior of as- prepared Ni-W-P coatings in high salty brine of deep underground was evaluated by electrochemical potentiodynamic polarization curve testing and static immersion corrosion testing.The morphology and composition of the two kinds of Ni-W-P coatings before and after corrosion were analyzed by scanning electron microscopy and energy dispersive spectrometry.Furthermore,the anticorrosion mechanisms of the two kinds of Ni-W-P alloy coatings were discussed.Results indicated that the two kinds of Ni-W-P coatings exhibited higher corrosion potential than the N80 steel substrate,and they were capable of cathodic protection for the steel substrate.Besides,both electroless and electroplated Ni-W-P coatings had a very slow corrosion rate in high salty brine of deep underground,which meant that they could be promising protective coatings with excellent performance for the N80 steel.