采用热重分析法和物理测试技术研究了铁铬合金子700～800℃空气中有Na_2SO_4-MgSO_4-CaSO_4三元熔融硫酸盐膜存在时的腐蚀行为,发现三元硫酸盐能加速铁铬合金的氧化。根据实验结果可以认为,这一加速腐蚀是由于硫化引起的贫铬及硫化物加速传质所致。
The corrosion behaviour of Fe~-Cr alloys in the presence of a thin layer of Na_2SO_4-MgSO_4-CaSO_4 was studied in air in the temperature range of 700～800℃ by means of thermogravimetry and some physical analysis techniques such as X-ray diffraction, SEM, EMP, etc. It was found that the molten ternary sulfates accelerated the oxidation of the alloys. The experimental results lead to a proposition that the accelerated oxidation is related to the chromium depletion resulting from sulfidation and easier diffusion of metal ions through the sulfides formed.
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