表面活性剂FC4添加量对Ni-P-PTFE复合镀层表面形貌及耐蚀性能的影响

Effects of Concentration of Surfactant FC4 on Surface Morphology and Corrosion Resistance of Ni-P-PTFE Composite Coatings

在Ni-P-PTFE复合镀液中加入0.12~0.24g·L^(-1)的表面活性剂FC4,采用化学复合镀工艺在30CrMnSi合金钢表面沉积了Ni-P-PTFE复合镀层,研究了FC4添加量对复合镀层的表面形貌及耐蚀性能的影响。结果表明:随着FC4添加量增加,镀层的表面形貌变差,镀速降低,镀层的孔隙率增大,耐蚀性能下降;这主要是因为过量的FC4会强烈吸附在基体表面,占据化学镀的活性中心,从而对施镀过程产生阻碍作用;当FC4添加量为0.12g·L^(-1)时,镀层的耐蚀性能最佳。

Ni-P-PTFE composite coatings were prepared by electroless composite plating on the surface of 30CrMnSi alloy steel in the plating solution with 0. 12 - 0.24 g·L^-1 surfactant FC4. Effects of concentration of surfactant FCA on surface appearance and corrosion resistance of the coatings were studied. The results show that, with the increase of concentration of FC4, the surface appearance of the coatings became worse, deposition rate decreased, porosity increased and corrosion resistance decreased. The main reason was that excessive FC4 would be absorbed strongly on the surface of substrate, occupied the active centers, and then hindered the deposition process. The coating owned the best corrosion resistance when the concentration of FC4 was 0.12g·L^-1.