在超声场中用脉冲电沉积法制备了Ni-CeO2纳米复合镀层, 考察了镀层中CeO2含量及表面形貌,研究了镀层在10wt%HCl溶液中的耐蚀性, 分析了超声作用下脉冲参数对镀层耐蚀性的影响. 结果表明：脉冲参数和超声波对镀层中CeO2含量和微观组织均有影响, 适宜的脉冲参数可以提高镀层中CeO2含量,细化镀层晶粒, 而超声波可促使镀层晶粒进一步细化; Ni-CeO2纳米复合镀层的耐蚀性与镀层中CeO2含量、镀层晶粒大小及组织致密程度有关; 在占空比0.2、脉冲频率1000Hz时超声作用下制备的镀层中CeO2含量较高, 镀层晶粒细小、组织致密, 腐蚀速率最低, 表现出优良的耐蚀性.
Ni-CeO2 nanocomposite coatings were prepared by pulse electrodeposition method in an ultrasonic field. The CeO2 content in the Ni-CeO2 nanocomposite coatings and surface morphology of the nanocomposite coatings were examined. The corrosion resistance of Ni-CeO2 nanocomposite coatings in 10% HCl solution was studied using static immersion method. Effects of the pulse parameters by electrodeposition with ultrasound on the corrosion resistance of Ni-CeO2 nanocomposite coatings were analyzed. The results show that the pulse parameters and ultrasound conditions obviously influence the CeO2 content in coatings and the microstructure of the nanocomposite coatings. Moderate pulse parameters can increase the CeO2 content in the coatings and refine grains, while ultrasound can make the grains finer. The corrosion resistance of the Ni-CeO2 nanocomposite coatings is related to the CeO2 content in coatings, grain size and compact microstructure of the coatings. The best corrosion resistance for the Ni-CeO2 nanocomposite coating is obtained under the condition of 0.2 duty cycle and 1000Hz pulse frequency in the presence of ultrasound, where Ni-CeO2 nanocomposite coating has higher CeO2 content, finer grains and more compact microstructure.
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