超声场中脉冲电沉积Ni-CeO_2纳米复合镀层的耐蚀性

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.

Corrosion Resistance of Ni-CeO_2 Nanocomposite Coatings Prepared by Pulse Electrodeposition in an Ultrasonic Field

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.