摘要
采用超音速火焰喷涂技术在Q235结构钢基体上制备了Cr3C2-NiCr复合涂层和镍基合金涂层,借助扫描电镜分析了两种涂层的微观组织和形貌。采用电化学研究方法研究了两种涂层在质量分数为3.5%的氯化钠溶液中的腐蚀性能。结果表明:Cr3C2-NiCr涂层中碳化物分布均匀,层状结构明显,孔隙率为1.6%,镍基涂层中碳化物颗粒较小,也呈均匀分布,孔隙率为1.1%。电化学阻抗谱和极化曲线表明:Cr3C2-NiCr涂层和镍基涂层在3.5%NaCl溶液中的耐蚀性均较好,镍基涂层的抗腐蚀性能更优。
Cr3C2-NiCr coating and nickel-based coating were prepared on Q235 steel by high velocity oxy-fuel(HVOF)thermal spraying,the microstructures of coatings were analyzed by scanning election microscopy(SEM).The corrosion resistance of the two as-sprayed coatings in the solution of mass fraction of 3.5% NaCl was evaluated by the electrochemical method.The result showed that the Cr3C2-NiCr coating exhibited high consistency and a layered structure,the carbides evenly distributed among the matrix.The carbides in nickel-based coating had smaller particles size and they evenly distributed among the matrix too.The porosity of Cr3C2-NiCr coating and nickel-based coating was 1.6%,1.1% respectively.The electrochemical impedance spectroscopy(EIS)data and polarization curve indicated both of the two coatings had a quite good corrosion resistance in 3.5% NaCl solution.In comparison of Cr3C2-NiCr coating,nickel-based coating had a better corrosion resistance.
出处
《理化检验（物理分册）》
CAS
2014年第5期322-325,350,共5页
Physical Testing and Chemical Analysis(Part A:Physical Testing)
基金
国家自然科学基金资助项目(51301059)
