在由硫酸镍31g/L、次磷酸钠22g/L、乙醇酸30g/L、乙酸钠13g/L、二甲胺0.8g/L、全氟乙基碘化铵0.1g/L及重晶石(即硫酸钡)0～25g/L组成的稳定镀液中,采用化学镀的方法在低碳钢上制备了Ni-P-BaSO4复合镀层.其表面形貌采用扫描电镜进行分析,耐蚀性以动电位极化及电化学阻抗谱测试.镍-磷合金基体中掺入硫酸钡,提高了化学镀层的显微硬度.相对于纯Ni-P 合金镀层,Ni-P-BaSO4复合镀层具有更小的磨损率.硫酸钡颗粒的存在使得复合镀层的耐蚀性明显降低.
Ni-P-BaSO4 composite coatings were prepared on mild steel by electroless plating from a stable bath containing nickel sulfate 31 g/L, sodium hypophosphite 22 g/L, glycolic acid 30 g/L,sodium acetate 13 g/L,dimethylamine 0.8 g/L,perfluoroethyl ammonium iodide 0.1 g/L, and barite (BaS0O4) particles 0-25 g/L. The surface morphology of the composite coatings was analyzed by SEM,and the corrosion resistance by potentiodynamic polarization and electrochemical impedance spectroscopy. The incorporation of BaSO4 into Ni-P alloy matrix increases the microhardness of the electroless coatings. Ni-P-BaSO4 composite coating exhibits a distinctly small wear rate as compared with pure Ni-P alloy coating. The presence of barite particles in the deposit significantly reduces the corrosion resistance of the composite coatings.
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