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针对油田抽油泵泵筒内表面强化问题，对合金共沉积进行了试验研究，分析了合金共沉积的条件，形成合金时的电位及其共沉积金属的极化电位，共沉积金属的平衡电位。要实现金属离子共沉积，则它们的标准电位须相同或相差不大，而改变离子活度可使平衡电位接近。采用混合络合镀液，使电极电位改变，从而实现共沉积。合金元素的析出电位取决于平衡电位、合金自由能引起的电位差和极化引起的过电位之和。研制了Ｃｏ－Ｗ合金元素镀液。主盐采用ＣｏＳＯ＿４和Ｎａ＿２ＷＯ＿４，在定性分析的基础上，定量地计算出主盐、络合剂等的用量，进行了配方，并用该配方电沉积试件，经检测，试件镀层硬度、耐磨住、金相组织等项指标达到设计要求。
Aiming at the problem of strengthening the inner surface of oil pump pump barrel in oil field, the co-deposition of alloy was studied. The conditions of co-deposition of alloy, the potential of alloy and the polarization potential of co-deposited metal and the equilibrium potential of co-deposited metal were analyzed. To achieve co-deposition of metal ions, their standard potential must be the same or little difference, and change the ion activity can make the equilibrium potential close. Mixed mixed bath, the electrode potential change, in order to achieve co-deposition. The precipitation potential of alloying elements depends on the equilibrium potential, the potential difference caused by the free energy of the alloy, and the overpotential due to polarization. Developed Co-W alloy plating solution. Based on the qualitative analysis, CoSO_4 and Na_2WO_4 were used as the main salt, the dosage of the main salt, complexing agent and so on were calculated quantitatively. The formulations were prepared and the samples were electrodeposited with this formulation. After testing, the coating hardness and wear resistance Live, metallurgical organizations and other indicators to meet the design requirements.