化学镀Ni-W-Fe-P合金镀层耐蚀性的研究
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摘要
向Ni-P化学镀液中添加适量的钨酸钠和硫酸亚铁,在20#钢基体上制备了化学镀Ni-W-P合金镀层及化学镀Ni-W-Fe-P合金镀层。采用扫描电子显微镜观察了镀层的表面形貌,采用能谱仪测试了镀层的成分,采用X射线衍射仪分析了镀层的结构,并利用电化学工作站测试了镀层在3.5%的NaCl溶液中的耐蚀性。结果表明:化学镀Ni-W-Fe-P合金镀层均匀致密,为高磷非晶态镀层,镀层中W、Fe和P的质量分数分别为2.39%、1.54%和8.63%。与化学镀Ni-P合金镀层相比,化学镀Ni-W-Fe-P合金镀层在3.5%的NaCl溶液中表现出更低的致钝电流密度、维钝电流密度和自腐蚀电流密度,说明化学镀Ni-W-Fe-P合金镀层具有更好的耐蚀性。
Ni-W-P alloy coating and Ni-W-Fe-P alloy coating were prepared on 20#steel substrate by electroless deposition with appropriate amount of sodium tungstate and ferrous sulfate added to Ni-P bath.The surface morphology of coatings were observed by scanning electron microscopy,the composition was tested by energy dispersive spectrometer,the structure was analyzed by X-ray diffraction,and the corrosion resistance in 3.5% NaCl solution was tested by electrochemical workstation.Results showed that the amorphous and high-P Ni-W-Fe-P alloy coating was uniform and dense,the mass fraction of element W,Fe and P in the coating was2.39%,1.54% and 8.63%,respectively.Compared with Ni-P alloy coating,Ni-W-Fe-P alloy coating showed lower critical passive current density,dimensional passive current density and self-corrosion current density in 3.5% NaCl solution,indicating that Ni-W-Fe-P alloy coating has better corrosion resistance.
Ni-W-P alloy coating and Ni-W-Fe-P alloy coating were prepared on 20#steel substrate by electroless deposition with appropriate amount of sodium tungstate and ferrous sulfate added to Ni-P bath.The surface morphology of coatings were observed by scanning electron microscopy,the composition was tested by energy dispersive spectrometer,the structure was analyzed by X-ray diffraction,and the corrosion resistance in 3.5% NaCl solution was tested by electrochemical workstation.Results showed that the amorphous and high-P Ni-W-Fe-P alloy coating was uniform and dense,the mass fraction of element W,Fe and P in the coating was2.39%,1.54% and 8.63%,respectively.Compared with Ni-P alloy coating,Ni-W-Fe-P alloy coating showed lower critical passive current density,dimensional passive current density and self-corrosion current density in 3.5% NaCl solution,indicating that Ni-W-Fe-P alloy coating has better corrosion resistance.
引文
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