【摘要】 目的研究以三乙醇胺作为络合剂对化学镀Ni-W-P合金镀层的组织结构和腐蚀性能的影响。方法以化学镀的方法在40Cr基体上制备Ni-W-P合金镀层,研究了三乙醇胺对Ni-W-P合金镀层的成分结构、沉积速率、耐蚀性和孔隙率的影响。结果三乙醇胺用量为8 m L/L时镀层W、P质量分数达到峰值,分别为3.63%、9.34%。三乙醇胺用量较低时,镀层具有非晶态结构;三乙醇胺用量达到12 m L/L时镀层开始出现晶态峰,具有混晶态结构。三乙醇胺浓度对镀层的沉积速率和孔隙率具有很大影响,三乙醇胺用量为10 m L/L时,镀速达到最大值14.1μm/h,用量为8 m L/L时,镀层的孔隙率最低,为0.07%。化学镀Ni-W-P合金镀层的耐蚀性随着三乙醇胺浓度的增加,具有先增加后降低的趋势,用量为8 m L/L时,镀层的腐蚀速率最低,为5.6μm/a,耐蚀性最好。结论以三乙醇胺作为络合剂能够得到胞状颗粒且颗粒均匀细小的Ni-W-P合金镀层,对镀层的结构具有一定的影响,可以提高Ni-W-P合金镀层的沉积速率。Ni-W-P合金镀层具有很好的耐蚀性,腐蚀速率最低为5.6μm/a。更多还原

【Abstract】 Objective To research the effect of trolamine complexing agent on structure and properties of electroless Ni-W-P alloy coating. Methods Ni-W-P alloy coating was prepared on 40 Cr substrate by chemical plating. The effect of trolamine on structural components, deposition rates, corrosion resistance and porosity of Ni-W-P alloy coating was investigated. Results When concentration of trolamine was 8 m L/L, the mass fraction of coating W and P reached at the peak 3.63% and 9.34% respectively. The coating was amorphous structure when concentration of trolamine concentration was low while it began to take on cystalline state peak and have mixed cystalline when the concentration reached 12 m L/L. Trolamine concentration had great influence on the deposition rate and porosity of the coating. The deposition rate reached maximum 14.1 μm/h as the trolamine concentration increased, and the coating porosity reached minimum 0.07% when the trolamine concentration decreased to 8 m L/L. The corrosion resistance of the Ni-W-P alloy coating tended to firstly increase and then fall down with the increasing trolamine concentration in plating bath. The Ni-W-P alloy coating had the best corrosion resistance at corrosion rate of 5.6 μm/a and concentration of 8 m L/L. Conclusion The use of trolamine as complexing agent can produce Ni-W-P alloy with uniform and fine cellular particles and has a certain influence on the structure of the coating. It can improve the deposition rate of the Ni-W-P alloy coating. The Ni-W-P alloy coating has good corrosion resistance with the minimum corrosion rate at 5.6 μm/a.更多还原