论文部分内容阅读
为提高液压立柱材料表面硬度和耐蚀性,延长立柱使用寿命,在27SiMn钢表面制备Ni-Ce-P化学镀镀层。通过正交试验,以单位时间镀层的厚度为评定指标,获得最佳工艺配方,并利用光学显微镜、X射线衍射仪和电化学工作站,对最优化Ni-Ce-P镀层与Ni-P镀层进行形貌、物相和腐蚀性能分析。结果表明:主盐硫酸镍对镀速的影响最大,Ni-Ce-P镀层最佳工艺为硫酸镍31 g/L、次亚磷酸钠25 g/L、柠檬酸钠20 g/L、丁二酸6 g/L、碘酸钾40 mg/L、醋酸钠14 g/L、硫酸铈40 mg/L、pH=5.5,当施镀温度(85±2)℃时,制得的镀层厚度为21.045μm。该Ni-Ce-P镀层表面平整致密,胞状结构微小,镀层物相结构以非晶为主,稀土Ce促进镀层的非晶态趋势;Ni-Ce-P镀层与Ni-P镀层相比,耐腐蚀性能得到了很大的改善。
In order to improve the surface hardness and corrosion resistance of hydraulic column material and extend the service life of the column, Ni-Ce-P electroless plating was prepared on the surface of 27SiMn steel. Through orthogonal test, the thickness of coating per unit time was taken as the evaluation index, the best process recipe was obtained, and the optimized Ni-Ce-P and Ni-P coatings were obtained by using optical microscope, X-ray diffraction and electrochemical workstation Morphology, phase and corrosion analysis. The results show that the main salt of nickel sulfate has the greatest influence on the plating rate. The optimum process of Ni-Ce-P coating is 31 g / L nickel sulfate, 25 g / L sodium hypophosphite, 20 g / L sodium citrate, Acid, 6 g / L of acid, 40 mg / L of potassium iodate, 14 g / L of sodium acetate, 40 mg / L of cerium sulfate and pH = 5.5. When the plating temperature was (85 ± 2) 21.045 μm. The surface of the Ni-Ce-P coating is smooth and dense, the cell structure is small, the phase structure of the coating is amorphous, and the rare earth Ce promotes the amorphous tendency of the coating. Compared with the Ni-P coating, the Ni-Ce- Corrosion performance has been greatly improved.