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合氟铁矿在高炉中冶炼时,炉顶煤气中含有微量的氟化氢(6—14 p.p.m.);本研究观察了含氟模拟煤气对三号结构钢的腐蚀情况。所用合成煤气的成分为:0.05—5%HF,1.5—2.5%H_2,0—1%H_2O,6—8%CO_2,19—23%CO,余为N_2;实验的温度范围为250—530℃。在～390℃以下,腐蚀产物为FeF_2,有保护作用。煤气中氢的存在,能阻止FeF_2的生成。在～390℃以上,所生成的FeF_2即被水蒸气转化为Fe_3O_4;即使在原先干燥的合成煤气中,组份中的CO_2和H_2作用所生成的水蒸气,已足够推动此转化反应到完毕。所以在～390℃以上,腐蚀产物都为Fe_3O_4。以上所得的各实验结果,都与热力学计算的结果相符。将氟化氢浓度自0.05%提高到5%,在390℃以下,腐蚀作用并不显著地增加。
When the ferroferrite is smelted in a blast furnace, the top gas contains a trace amount of hydrogen fluoride (6-14 p.p.m.). The present study investigated the corrosion of the third structure steel with a fluorine-containing simulated gas. The composition of the synthetic gas used is: 0.05-5% HF, 1.5-2.5% H 2, 0-1% H 2 O, 6-8% CO 2, 19-23% CO, the balance being N 2; the experimental temperature range is 250-530 ° C. . Below ~ 390 ℃, the corrosion product is FeF_2, which has protective effect. The presence of hydrogen in gas can prevent the formation of FeF_2. Above ~ 390 ℃, the generated FeF_2 is transformed into Fe_3O_4 by steam. Even in the original dry synthesis gas, the water vapor generated by the action of CO_2 and H_2 in the component is enough to push the conversion reaction to completion. So above ~ 390 ℃, the corrosion products are all Fe_3O_4. The experimental results obtained above, are consistent with the results of thermodynamic calculations. Increasing the hydrogen fluoride concentration from 0.05% to 5% does not significantly increase the corrosion below 390 ° C.