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应用电化学技术及物相分析技术研究FeAl系金属间化合物在熔融NaCl-(Na,K)_2SO_4体系中的热腐蚀行为。结果表明,FeAl合金耐蚀性能较差。合金表面没有形成完整的保护性Al_2O_3氧化膜,而是遭受了严重的内氧化、硫化,且内氧化、硫化主要沿晶界发生。在局部内氧化、硫化严重区域,材料明显变脆,Zr的添加虽可改善FeAl合金的耐蚀性能,但其作用尚不足以抑制合金内硫化、内氧化的发生。而B的微量添加效果十分明显,合金表面发展出较完整的富Al_2O_3氧化层,合金不再遭受内硫化、内氧化。
Electrochemical techniques and phase analysis techniques were used to study the hot corrosion behavior of FeAl intermetallic compounds in molten NaCl- (Na, K) _2SO_4 system. The results show that the corrosion resistance of FeAl alloy is poor. Instead of forming a complete protective Al 2 O 3 oxide film on the surface of the alloy, it undergoes severe internal oxidation, sulfidation and internal oxidation, and sulfidation mainly occurs along the grain boundary. In the local internal oxidation and severe vulcanization, the material becomes obviously brittle. The addition of Zr can improve the corrosion resistance of the FeAl alloy, but its effect is not enough to inhibit the occurrence of internal oxidation and internal oxidation of the alloy. However, the trace addition effect of B is very obvious. A more complete Al 2 O 3 oxide layer is developed on the surface of the alloy, and the alloy is no longer subjected to internal vulcanization and internal oxidation.