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不锈钢表面电镀Pd-Ni膜层在强腐蚀性溶液中对基体能起到良好保护作用,但膜层服役性能及寿命还需进一步提高。本文作者研究电流密度对316L不锈钢表面电沉积Pd-Ni膜层成分、组织和性能影响。在单一镀槽中通过控制电流密度在316L不锈钢基体上制备多种多层Pd-Ni膜层。采用扫描电子显微镜、失重实验、结合力、孔隙率和电化学方法研究不同制备工艺镀膜在强腐蚀溶液中的耐蚀性能。结果表明:相比单层膜层,多层膜层在保持较高显微硬度的同时,内应力明显减小,孔隙率显著降低,与基体的结合力提高;在含Cl~-的高温硫酸环境中多层Pd-Ni膜层显示出更优异的耐蚀性能。
The Pd-Ni coating on the surface of stainless steel can protect the substrate in strong corrosive solution, but the service life and service life of the coating need to be further improved. The authors studied the effect of current density on the composition, microstructure and properties of Pd-Ni films deposited on 316L stainless steel. A variety of multilayer Pd-Ni films were prepared on a 316L stainless steel substrate by controlling the current density in a single plating bath. The corrosion resistance of different preparation technology coating in strong corrosion solution was studied by scanning electron microscope, weight loss test, bonding force, porosity and electrochemical method. The results show that compared with the single layer, the multi-layer film maintains a relatively high microhardness while the internal stress decreases obviously, the porosity decreases significantly and the bonding strength with the substrate increases. In the high temperature sulfuric acid environment with Cl ~ - Multi-layer Pd-Ni film shows more excellent corrosion resistance.