通过改变镀液中H3PO3的添加量(15～40 g/L)制备不同P含量的Fe-Co-Ni-P镀层,采用XRD衍射仪、交流阻抗谱和超声波气蚀试验,分别研究和分析了P含量对镀层的结构以及腐蚀、气蚀性能的影响.结果表明:该四元合金镀层基本都为非晶态.随着合金镀层中P含量增加,镀层表面的胞状组织越来越细密,其耐腐蚀性能逐渐增强.当镀液中H3PO3添加量为40 g/L时,镀层的耐腐蚀性能最好.当镀液中H3PO3为15 g/L时,交流阻抗谱表现出Warburg阻抗的特征,溶液状态由电荷迁移、扩散以及化学反应混合.当镀液中H3PO3为20～40 g/L时,镀层的交流阻抗谱都只有一个容抗弧,表现出一个时间常数特征,且电极过程存在扩散受阻的现象.当镀液中H3PO3为40 g/L时,拟合的等效电路中的镀层电荷转移电阻Rf达到最大值3 494 Ω·cm2.且当镀液中H3PO3的添加量为40 9/L时,其镀层抗气蚀性能也最好.
Fe-Co-Ni-P alloy coatings with different P content were prepared by adjusting the amount of H3PO3(15～40 g/L) in the bath.The influence of P content on the structure and properties of the electrodeposited Fe-Co-Ni-P alloy coating was analyzed by XRD,AC impedance spectra and ultrasonic cavitation test.The results show that these alloyed coatings are amorphous.Higher P content is benificial to refine the cellular structure of coatings,which helps to improve the corrosion resistance of the coating.When the H3PO3 content in the bath is to 40 g/L,the coating has the best corrosion resistance.When the H3PO3 content in the bath is to 15 g/L,the AC impedance spectra show the characteristic of Warburg impedance.However,when the H3PO3 content in the bath is 20-40 g/L,it only have a capacitive arc,which indicates ablocked diffusion in the electrode process.When the H3PO3 content in the bath is to 40 g/L,the charge transfer resistance Rf of the equivalent circuit coating reaches the maximum value 3 494 Ω·cm2 in all the coatings.Moreover,the coating fabricated from 40 g/L H3PO3 has the best cavitation resistance performance.
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