采用自制装置研究了12CrMoV、20~#钢、热浸铝12CrMov和20~#钢在硫酸铁分解产生SO_3中的腐蚀行为。实验结果表明由于硫酸铁分解产生的SO_3引起了12CrMoV、20~#钢的加速腐蚀。在20~#钢、12CrMoV试样上的腐蚀产物主要是硫酸铁和硫酸亚铁,在其表面和内界面都没有看到金属的硫化物。 经热浸铝的12CrMoV、20~#钢的抗腐蚀性能比没有铝的好得多,热浸铝的12CrMov表面上的腐蚀产物是氧化铝和铝的硫化物,在涂层与基体交界处只有硫酸铝和硫酸铁。 根据实验结果,作者提出了可能的腐蚀机理。
The corrosion behavior of plain 12CrMoV, mild steel, hot-dip aluminized 12CrMoV and mild steel was studied in SO_3 from decomposition of ferric sulfate by using a specially designed apparatus. The experimental results indicated that accelerated corrosion of plain 12CrMoV and mild steel was caused by SO_3 from decomposition of ferric sulfate. Corrosion products on plain 12CrMoV and mild steel specimens were the same, mainly ferric sulfate and ferrous sulfate, with no sulfide of metals either on surface or at scale/substrate interrace. The corrosion resistance of hot-dip aluminized 12CrMoV and mild steel were better than that of either uncoated steel. The corrosion products on surface of hot-dip aluminized 12CrMoV specimen were alumina and aluminum sulfate only while aluminum sulfate and ferric sulfate were found at coating/substrate interface. From the experimental results, possible mechanism of corrosion was proposed.
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