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参照国际海事组织(IMO)所规定的模拟货油舱上甲板(COT)试验条件,利用专门建立的模拟上甲板环境腐蚀试验装置,研究了货油舱上甲板环境中,不同气体成分对低合金钢的腐蚀行为的影响。观察了低合金钢在不同成分的气体中基体和腐蚀产物的宏观和微观形貌,测定了锈层的物相组成。研究结果显示,在干湿交替环境下,低合金钢在SO2+CO2+O2+N2气体中的腐蚀速率是H2S+N2气体中的5.7倍;H2S+N2环境下腐蚀产物为FeS,SO2+CO2+O2+N2环境下腐蚀产物为α-FeOOH、Fe2O3、FeSO4,且基体表面存在沿晶界发生的沟渠状和酸性液滴造成的斑状腐蚀形貌。
According to the test conditions of the upper deck (COT) simulated by the International Maritime Organization (IMO) and using the specially designed simulated upper deck environmental corrosion test device, the effects of different gas compositions on the low alloy Effect of steel corrosion behavior. The macroscopic and microscopic morphology of matrix and corrosion products of low alloyed steel in different compositions were observed. The phase composition of the rust layer was measured. The results show that the corrosion rate of low-alloy steels in SO2 + CO2 + O2 + N2 gas is 5.7 times higher than that in H2S + N2 gas under the alternate wetting and drying conditions. The corrosion products of H2S + N2 are FeS, SO2 + CO2 The corrosion products in the + O2 + N2 environment are α-FeOOH, Fe2O3 and FeSO4, and the surface of the substrate has the speckled corrosion morphology caused by the ditch-shaped and acidic droplets along the grain boundary.