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利用正交试验,选择温度、主盐浓度等4个因素,通过极差分析,确定了S135钻杆钢电沉积Fe-Ni-W合金镀层的最佳制备工艺,研究了镀液p H值、电流密度以及柠檬酸钠对镀层的组分、显微硬度和沉积速率的影响。结果表明,在本试验条件下,获得的合金镀层结构为非晶态;随着镀液PH升高,镀层显微硬度先增大后减小,沉积速率总体呈下降趋势;镀层沉积速率随电流密度增加也逐渐增大,当电流密度从6 A/dm~2提高到15 A/dm~2时,合金硬度从320 HV增加到540 HV;提高镀液中的柠檬酸钠含量时,铁和钨均呈现增加趋势,而镍却出现下降趋势,同时,镀层硬度先增大后减小,沉积速率逐渐减小。
The optimal preparation technology of electrodeposited Fe-Ni-W alloy coating for S135 drill pipe steel was determined by using range analysis, orthogonal test, selection temperature and main salt concentration. The effects of p H value, Current density and the effect of sodium citrate on the composition, microhardness and deposition rate of the coating. The results show that under the experimental conditions, the structure of the obtained alloy coating is amorphous. With the increase of the bath pH, the microhardness of the coating first increases and then decreases, and the deposition rate decreases. The deposition rate of the coating decreases with the increase of the current When the current density increased from 6 A / dm ~ 2 to 15 A / dm ~ 2, the hardness of the alloy increased from 320 HV to 540 HV. When the content of sodium citrate in the bath was increased, Tungsten showed an increasing trend, while nickel showed a downward trend, at the same time, the coating hardness first increased and then decreased, the deposition rate decreased.