在由CrCl3·6H2O 150 g/L、FeSO4·7H2O 5 g/L、NiSO4·6H2O 20 g/L、NaBr 10 g/L、NH4Cl 50 g/L、H3BO330 g/L、HCOOH 35 g/L、DMF 30 mL/L、C6H5Na3O780 g/L、NaH2PO2·H2O 10 g/L、C7H5O3NS 0.5 g/L 和 CH3(CH2)10CH2OSO3Na 0.06 g/L 组成的Ni-Fe-Cr-P合金基础电镀液的基础上，采用扫描电镜、能谱和X射线衍射研究了镀液中CrCl3质量浓度对镀层表面微观形貌、成分和结构的影响，采用贴滤纸法、电化学极化和电化学阻抗谱研究了不同CrCl3质量浓度时所得镀层的耐蚀性。结果表明，镀液中CrCl3浓度过高或过低都会导致合金镀层中Cr含量的降低，而随着镀层中Cr含量降低，镀层中球状颗粒变粗，致密度下降并出现微裂纹。当镀液中CrCl3质量浓度为150 g/L时，获得的镀层光滑致密，为非晶态结构，其孔隙率最小，电化学阻抗和极化电阻最大，腐蚀电流密度最小，耐蚀性能最好。
The effect of mass concentration of CrCl3 on the surface morphology, chemical composition, and micro-structure of Ni-Fe-Cr-P alloy coating electroplated from a bath containing CrCl3·6H2O 150 g/L, FeSO4·7H2O 5 g/L, NiSO4·6H2O 20 g/L, NaBr 10 g/L, NH4Cl 50 g/L, H3BO3 30 g/L, HCOOH 35 g/L, DMF 30 mL/L, C6H5Na3O7 80 g/L, NaH2PO2·H2O 10 g/L, CH3(CH2)10CH2OSO3Na 0.06 g/L, and C7H5O3NS 0.5 g/L was studied by scanning electron microscopy, energy-dispersive spectroscopy, and X-ray diffraction. The corrosion resistance of the alloy coatings obtained with different CrCl3 concentrations was studied by porosity test with ferroxyl indicator, electrochemical polarization measurement, and electrochemical impedance spectroscopy. The results showed that the content of Cr in the alloy coating are decreased if the concentration of CrCl3 in the bath is too high or too low. The spherical particles of coating become bigger, the compactness falls off, and micro-cracks appear as the content of Cr in the coating is reduced. The Ni-Fe-Cr-P alloy coating obtained at CrCl3 150 g/L features amorphous structure, smooth and compact surface, lowest porosity, biggest electrochemical impedance and polarization resistance, and smallest corrosion current density, showing best corrosion resistance.
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