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分别采用热浸法和固渗法在工业纯铁上制备了铝的扩散涂层;工业纯铁上铬的扩散涂层是用固渗法获得的。对渗铝和渗铬的工业纯铁在有 K_2SO_4-Na_2SO_4 盐膜存在时的低温热腐蚀行为进行了研究。结果表明,渗铝的工业纯铁仍遭受低温热腐蚀,这一热腐蚀的发生归因于 K-Na-Al-Fe 四元低熔点复合硫酸盐的形成。而渗铬的工业纯铁表现出优异的耐蚀性能,这归因于涂层表面完整的富 Cr_2O_3 氧化膜的快速形成。据此有理由认为,渗铬是铁基合金低温热腐蚀防护的一个有效途径。
Diffusion coating of aluminum was prepared on industrial pure iron by hot-dipping method and solid-permeation method respectively. The diffusion coating of chromium on industrial pure iron was obtained by solid-infiltration method. The low temperature hot corrosion behavior of industrial pure iron with aluminized and chromized steel in presence of K_2SO_4-Na_2SO_4 salt film was studied. The results show that aluminized industrial pure iron is still subject to low temperature hot corrosion, the occurrence of this hot corrosion attributed to the formation of K-Na-Al-Fe quaternary low melting point composite sulfate. In contrast, chromized industrial pure iron showed excellent corrosion resistance due to the rapid formation of a Cr? O? -rich oxide film on the surface of the coating. Based on this, it is reasonable to assume that chromizing is an effective way to prevent low-temperature hot corrosion of iron-based alloys.