Fu Xiuqing, Ma Wenke, Duan Shuanglu, Wang Qingqing, Lin Jinran
College of Engineering, Nanjing Agricultural University, Nanjing 210095, China.
Key laboratory of Intelligence Agricultural Equipment of Jiangsu Province, Nanjing 210031, China.
Materials (Basel). 2019 Aug 16;12(16):2614. doi: 10.3390/ma12162614.
In order to study the effect of nano-CeO particles doping on the electrochemical corrosion behavior of pure Ni-Fe-Co-P alloy coating, Ni-Fe-Co-P-CeO composite coating is prepared on the surface of 45 steel by scanning electrodeposition. The morphology, composition, and phase structure of the composite coating are analyzed by means of scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The corrosion behavior of the coatings with different concentrations of nano-CeO particles in 50 g/L NaCl solution is studied by Tafel polarization curve and electrochemical impedance spectroscopy. The corrosion mechanism is discussed. The experimental results show that the obtained Ni-Fe-Co-P-CeO composite coating is amorphous, and the addition of nano-CeO particles increases the mass fraction of P. With the increase of the concentration of nano-CeO particles in the plating solution, the surface flatness of the coating increases. The surface of Ni-Fe-Co-P-1 g/L CeO composite coating is uniform and dense, and its self-corrosion potential is the most positive; the corrosion current and corrosion rate are the smallest, and the charge transfer resistance is the largest, showing the best corrosion resistance.
为了研究纳米CeO颗粒掺杂对纯Ni-Fe-Co-P合金涂层电化学腐蚀行为的影响，采用扫描电沉积法在45钢表面制备了Ni-Fe-Co-P-CeO复合涂层。通过扫描电子显微镜（SEM）、能谱仪（EDS）和X射线衍射仪（XRD）对复合涂层的形貌、成分和相结构进行了分析。采用塔菲尔极化曲线和电化学阻抗谱研究了不同浓度纳米CeO颗粒的涂层在50 g/L NaCl溶液中的腐蚀行为，并探讨了腐蚀机理。实验结果表明，所制备的Ni-Fe-Co-P-CeO复合涂层为非晶态，纳米CeO颗粒的加入提高了P的质量分数。随着镀液中纳米CeO颗粒浓度的增加，涂层表面平整度提高。Ni-Fe-Co-P-1 g/L CeO复合涂层表面均匀致密，自腐蚀电位最正，腐蚀电流和腐蚀速率最小，电荷转移电阻最大，具有最佳的耐蚀性。
