WC含量对定向结构Ni60涂层耐蚀性能的影响

Effect of WC Content on Corrosion Resistance of Directional Structure Ni60 Coating

为了研究WC含量对Ni60合金涂层耐腐蚀性能的影响规律及相关机制,向Ni60合金粉体中添加不同质量分数的WC,通过高频感应重熔和强制冷却技术,在45#钢表面制备WC添加的Ni60/WC复合定向结构涂层。采用SEM、EDS、XRD、电化学性能测试和浸泡实验等检测手段分析研究了WC颗粒增强Ni60合金的定向结构复合涂层的耐腐蚀性能及其机制。结果表明:随着WC添加量的增加,极化电阻先增大后减小,WC添加量为10%时达到最大值9710.8Ω;腐蚀电流密度先减小后增大,WC添加量为10%时最小,为1.34×10^-6 A/cm^2。WC添加量对涂层显微形貌、元素分布、物相均有影响,进而影响涂层耐蚀性能。

In order to study the influence of WC content on the corrosion resistance of Ni60 alloy coating and the related mechanism,WC of different contents was added to Ni60 self-fused alloy powder,and Ni60/WC directional structure composite coatings were prepared on 45#steel by induction remelting and forced cooling technology.The corrosion resistance and mechanism of WC particles reinforced Ni60 alloy directional structure composite coatings were investigated by SEM,EDS,XRD,electrochemical test and immersion corrosion.Results show that the polarization resistance of the composite coatings increases first and then decreases with the increase of WC,and the maximum polarization resistance reaches 9710.8Ωwhen the WC addition amount is 10%.The corrosion current density of the composite coatings decreases first and then increases,and the minimum current density reaches 1.34×10^-6 A/cm^2 with 10%WC content.The WC content has an important effect on microstructures,element distribution,phases of composite coatings,and further affects the corrosion resistance.