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本文用Mossbauer谱测定了钢材加热过程中所生成的氧化铁皮的组成,发现:(1)氧化铁皮的主要成分是FeO,其次是Fe_3O_4,还有少量的α-Fe_2O_3;(2)用乳化重油代替重油作为燃料加热钢材所生成的氧化铁皮成分中Fe_3O_4的比例显著增大,FeO的比例明显减小,α-Fe_2O_3的相对含量也有所降低。从化学反应平衡常数的计算得知;钢材加热过程中,随着气相组成中水和氢分压比的变化,氧化物中Fe_3O_4与FeO的比例会发生变化,这种变化趋势与Mossbauer谱的测定结果相一致.从而推断出燃用乳化重油改变氧化铁皮成分和降低氧化烧损的原因。
In this paper, the Mossbauer spectrum was used to determine the composition of the scale formed during the heating of steel. The results showed that: (1) the main components of the scale were FeO, followed by Fe 3 O 4 and a small amount of α-Fe 2 O 3; (2) The proportion of Fe 3 O 4 in the scale formed by heating heavy oil as fuel increased significantly, the proportion of FeO decreased obviously and the relative content of α-Fe 2 O 3 also decreased. From the calculation of the chemical equilibrium constant, the ratio of Fe 3 O 4 to FeO in the oxide changes with the change of the partial pressure of water and hydrogen in the gas phase during the heating of the steel. This trend is in agreement with the determination of the Mossbauer spectrum The result is consistent, and thus infer the use of emulsified heavy oil to change the composition of the oxide scale and reduce the oxidation of the burning causes.