目的研究Ni-Fe-P化学镀层抗CO2腐蚀性机理。方法通过SEM,EDS,XRD以及EIS等技术对经化学镀Ni-Fe-P处理后的35CrMo钢表面进行表征,分析其抗CO2的腐蚀性能。结果处理后的35 CrMo钢表面为非晶态组织,硬度高达570.12 HV。Ni-Fe-P镀层钢腐蚀倾向减小,极化电阻增大,镀层对基体形成了较好保护。镀层的腐蚀过程受溶液双电层和钝化膜的影响。结论Ni-Fe-P镀层在CO2水溶液中具有极强的钝化倾向,可显著提高材料的抗CO2腐蚀性能。
ABSTRACT:Objective To investigate the mechanism of CO2 corrosion resistance of Ni-Fe-P coating. Methods By means of SEM,EDS,XRD and EIS, CO2 corrosion resistance behavior at the surface of 35CrMo with Ni-Fe-P coating was characterized and analyzed. Results The results showed that after Ni-Fe-P coating, the surface of 35CrMo was turned into amorphous microstructure and its hardness reached up to 570. 12HV. The polarization resistance increased and the corrosion tendency decreased, which pro-vided good protection for the matrix. During the corrosion process, the corrosion behavior of the coating was affected by electric double layer capacitance and passivated film. Conclusion The Ni-Fe-P coating could significantly improve the resistance to CO2 due to its great passivation tendency in CO2 solution.
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