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利用高速电弧喷涂快速冷却的技术优势,采用自动化高速电弧喷涂技术在45钢表面制备了AlNiFeSiB非晶纳米晶复合涂层。采用X射线衍射仪、扫描电镜、差示扫描量热仪分析了该涂层的组织与热物理性能;在3.5wt%NaCl溶液中检测了涂层的腐蚀性能。结果表明,AlNiFeSiB复合涂层具有非晶纳米晶复合结构,涂层非晶含量约为60%,孔隙率约为2.2%,涂层的玻璃转变温度(T_g)为409℃,开始晶化温度(T_x)为457℃;涂层的自腐蚀电位约为-553.7mV,腐蚀电流密度约为0.52μA/cm~2。
Utilizing the technical advantages of rapid cooling by high-speed arc spraying, AlNiFeSiB amorphous nanocrystalline composite coatings were prepared on 45 steel by automated high-speed arc spraying. The microstructure and thermophysical properties of the coating were analyzed by X-ray diffraction, scanning electron microscopy and differential scanning calorimetry. The corrosion resistance of the coating was tested in 3.5wt% NaCl solution. The results show that the AlNiFeSiB composite coating has an amorphous nanocrystalline composite structure with an amorphous content of about 60% and a porosity of about 2.2%. The coating has a glass transition temperature (T_g) of 409 ° C and a starting crystallization temperature of T_x) was 457 ℃. The corrosion potential of the coating was about -553.7mV and the corrosion current density was about 0.52μA / cm ~ 2.