采用热浸镀及热扩散工艺在中国低活化马氏体钢(CLAM)表面制备出一层FeAl合金层,通过氧化处理成功地在CLAM表面制备出一层致密的氧化涂层。利用高分辨透射电镜分析了表面生长的氧化层为单一的氧化铝涂层。利用场发射扫描电镜(FESEM)及能量散射谱仪(EDS)分析了不同氧化工艺对于涂层结构及组成的影响。通过电化学阻抗谱测试分析不同氧化条件下制备的样品的耐腐蚀性能。结果表明,750℃下氧化4 h制备的涂层耐腐蚀性能最佳,其极化电阻值为8 059.54 Ω·cm²,有效孔隙率为0.142 87。

A Fe-Al alloy topcoat is prepared on the surface of China Low Activation Martensitic (CLAM) steel through a hot-dipping aluminizing method and a thermal diffusion process.Subsequently,a dense oxide coating is successfully formed on the surface of CALM by oxidation treatment.It is indicated through high resolution transmission electron microscopy (HRTEM) that the oxide layer grown on the surface of CALM is pure Al₂O₃.The effects of different oxidation processes on the structure and composition of the coating are characterized by means of field emission scanning electron microscopy (FESEM) and energy dispersive X-ray spectroscopy (EDS).The corrosion resistance of the samples prepared under different oxidation conditions is analyzed by means of electrochemical impedance spectroscopy test.Results show that the coating prepared by oxidation at 750℃ for 4 h has the best corrosion resistance,with a highest polarization resistance of 8 059.54 Ω·cm² and a lower effective porosity of 0.142 87.

邵宗明(1994-),男,博士研究生,研究方向为阻氚涂层,szmoak@sina.cn。