铁-球墨系金属抗铝热熔损性能及腐蚀机理研究

Research on the Aluminum Thermal Melting Resistance&Corrosion Mechanism of Iron-Ductile Metal

以经孕育/球化处理、石墨球密度数可调的铁-球墨系金属为研究对象,借助扫描电子显微镜、超声热熔损失重等分析手段,系统研究了不同球墨密度对铁-球墨系金属热熔损性能的影响规律。结果表明,随着球墨密度的增大,铁-球墨系金属热熔损失质量逐渐下降,铁-球墨系金属的抗铝液腐蚀性能与H13钢相比有明显的提升。铁-球墨系金属浸铝热熔损试验后,Fe-Al反应生成物层的厚度与球墨密度成反比,间距小、大比表面积的石墨球阻碍铝液与基体接触和铝液的扩散,从而抑制熔融铝液对基体的腐蚀。铁-球墨系金属表现出更优异的抗铝熔体腐蚀性能。

This paper studied iron-ductile metals with incubation/spheroidization treatment and adjustable graphite ball density.Using analytical methods like Scanning Electron Microscopy(SEM),ultrasonic thermal melt loss weight,the paper systematically studied the effects of different nodular graphite densities on the hot melt loss properties of iron-ductile metals.The results show that with the increase of ductile density,the weight of hot melt loss of iron-ductile metal gradually decreases,the molten aluminum corrosion resistance of iron-ductile metal is significantly improved compared with that of H13 steel.After the iron-ductile metal immersion thermal melting experiment,the thickness of the Fe-Al reaction product layer is inversely proportional to the ductile density,the graphite spheres with small spacing and large specific surface area hinder the contact between the molten aluminum and the matrix,diffusion of molten aluminum,thereby inhibiting the corrosion of the matrix by molten aluminum.Ironductile metals exhibit better resistance to aluminum melt corrosion.