二次正交旋转组合法优化Ni-W-P脉冲电沉积工艺

Optimization of Ni-W-P Pulse Electrodepositinn Process by Quadratic Orthogonal Rotational Regression Design

为解决油田设备中油管与油杆的磨损与腐蚀问题,通过脉冲电沉积方法在抽油杆常用钢材30Cr Mo基体上制备了Ni-W-P三元合金镀层,采用5因素5水平的二次正交旋转回归组合试验,对温度、pH值、占空比、电流密度、频率等工艺参数进行了优选。采用显微硬度计对36组镀层进行显微硬度测试,利用DPS软件分析获得5因素与镀层硬度之间的数学模型,并研究了各参数的影响规律,获得了电沉积工艺参数最优组合。结果表明:pH值对镀层硬度影响效果最显著,温度、占空比和平均电流密度对镀层硬度的影响规律与pH值相似,均随变量的增大呈先增后减的趋势;在温度为60℃、pH值为8、占空比为0.8、平均电流密度为6 A/dm2、频率为80 Hz的优化工艺下获得的镀层硬度为812.4 HV2 N,自腐蚀电流密度为2.576μA/cm2,且镀层为非晶镀层,具有优良的耐磨、耐蚀性。

Ni-W-P tertiary alloy was prepared on the surface of 30 CrMo substrate by pulse clectrodeposition.Technique parameters such as temperature,pH value,frequency,duty cycle and current density were optimized through quadratic orthogonal rotational regression design with 5levels and 5 factors.The micro-hardness of 36 coatings was measured by micro-hardness tester.The mathematical model between the 5 factors and the coating hardness was established by DPS software,and the influence of each parameter on the quality of coating was studied as well.Eventually,the optimized process parameters of pulse electrodeposition of Ni-W-P ternary alloy were obtained.Results showed that pH value had the most significant effect on coating hardness,and the influence of temperature,duty cycle and average current density on the coaling hardness was similar to that of pH value,which was first increased and then decreased with the increase of each parameter value.When the conditions were designed as follows:temperature of 60 ℃,pH value of 8,duty cycle of 0.8,current density of 6 A/dm^2 and frequency of 80 Hz,the coalings had excellent abrasion resistance and corrosion resistance.The hardness of the optimized coating was 812.4 HV_(2N) and the corrosion current density of the coating was 2.576 μA/cm^2.Besides,the coating was amorphous.