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利用钨酸钠通过电沉积在S135高强度钻杆用钢表面制备了Fe–Ni–W合金镀层。采用极化曲线测量以及结合力、显微硬度、厚度等测试研究了Fe–Ni–W合金镀层的耐蚀性和机械性能,并利用X射线衍射分析了其结构。结果表明,在其他条件相同(即Fe SO4·7H2O 30 g/L,Ni SO4·6H2O 40 g/L,C6H8O7·H2O适量,添加剂YC-2 1~5 g/L,pH 6.5,温度70°C,电流密度4 A/dm2,时间1 h)的情况下,改变钨酸钠的质量浓度(20~60 g/L),所得镀层的性能也不相同。当钨酸钠质量浓度为50 g/L时,镀层各种性能指标均达到最佳,镀层中主要含有Ni17W3和Fe Ni3等物相。
Fe-Ni-W alloy coating was prepared on the surface of S135 high strength drill pipe steel by electrodeposition using sodium tungstate. The corrosion resistance and mechanical properties of Fe-Ni-W alloy coating were investigated by polarization curve measurement, bonding strength, microhardness and thickness. The structure of Fe-Ni-W alloy coating was analyzed by X-ray diffraction. The results showed that under the same conditions (Fe SO4 · 7H2O 30 g / L, NiSO4 · 6H2O 40 g / L, C6H8O7 · H2O, YC-2 1-5 g / L, pH 6.5, temperature 70 ° C , The current density of 4 A / dm2, time 1 h), changing the mass concentration of sodium tungstate (20 ~ 60 g / L), the performance of the resulting coating is not the same. When the mass concentration of sodium tungstate is 50 g / L, the various performance indexes of the coating reach the best, and the coating mainly contains phases such as Ni17W3 and FeNi3.