电沉积Ni-W-Re_xO_y复合镀层组织性能研究

Research on microstructures and properties of Ni-W-Re_xO_y composites coatings prepared by electrodeposition

通过采用直流电沉积技术在45#钢基体表面制备了Ni-W-CeO_2(Dy_2O_3)复合镀层,利用SEM、EDS等表征手段分析了复合镀层的组织结构和表面形貌,并对其厚度、W含量、显微硬度以及耐蚀性能进行了测定。结果表明,稀土氧化物的加入有利于提高镀液的阴极极化作用,使镀层晶粒组织细化,并且随着添加量的增加,镀层组织由晶态向非晶态发生转变,复合镀层的W含量、显微硬度值、耐腐蚀性能逐渐提高。当其添加量为16g/L时,复合镀层综合性能最优。

The Ni-W-CeO2(Dy2O3)composite coating on 45#steel substrate was prepared by direct current electrodeposition process.The microstructure and morphology of the composite coatings were analyzed by SEM and EDS.At the same time,the thickness,tungsten content,microhardness and corrosion resistance of the coatings were measured.Results show that the addition of rare earth oxide particles can significantly improve the cathode polarization effect and refine the grain structure.Furthermore,with the increasing of the addition amount of the rare earth oxide,the microstructure of the coating is changed from crystalline to amorphous structure,and the tungsten content,microhardness,corrosion resistance of the Ni-W-CeO2(Dy2O3)composite coating increased gradually.When the addition amount is 16g/L,the comprehensive performance of the composite coating is best.