稀土铈对化学镀Ni-P-PTFE复合镀层防垢性能的影响

Effect of cerium concentration on the antifouling of electroless Ni-P-PTFE composite coatings

采用化学镀的方法在45号碳钢试样表面制备了稀土铈促进共沉积的Ni-P-PTFE复合镀层,利用扫描电子显微镜观察和分析了镀层的表面形貌,研究了稀土铈浓度对复合镀层的表面形貌、镀层的沉积速率、镀层中PTFE含量以及镀层防垢性能的影响。结果表明,适量稀土铈的加入使得镀层表面黑色粒子更加密集,即PTFE在镀层中的含量增加,在铈浓度为0.04g/L时达到最大;镀层的沉积速率与镀层中PTFE含量均随铈浓度的增加而呈现先升后降的趋势,在铈浓度为0.04g/L时分别达到最大值28.25μm/h和40.43%,而镀层中PTFE含量也随着沉积速率的增加而升高;铈的加入提高了镀层的防垢性能,镀层的结垢率随着铈对镀层中PTFE含量的影响而发生变化,当铈浓度为0.04g/L时,结垢率最低,仅为9.026g/m2,防垢效果最佳。

Rare earth cerium （Ce） promoting Ni-P-PTFE composite coatings were prepared on 45% carbon steels specimens by Electroless deposition. The surface morphology of the coatings was analyzed by scanning electron microscope （SEM）, effect of Ce concentration in the plating bath on deposition rates, PTFE content and fouling rates of the composite coatings were also investigated. The results indicate that addition of Ce into the bath significantly increases the black particles in the SEM pictures which indicates that the PTFE content of the coatings increases. As increase of Ce concentration in the plating bath, the deposition rates and the PTFE content of the coatings increases firstly, and reaches the maximums of 28.25μm/h and 40.43% in the Ce con centration of 0.04g/L, respectively, then gradually decreases. And PTFE content of the coatings increases with the increase Of the deposition rates. In addition, addition of Ce in the plating bath improves the antifouling property of the coatings, and the fouling rates relate to the PTFE content of the coating which changes with the Ce concentration and decreases to 9. 026g/m2 in the Ce concentration of 0.04g/L.