通过SO2气体加速腐蚀实验,利用环境扫描电镜 (XL30-FEG-ESEM)、能谱分析 (EDAX) 和Fourier红外光谱 (FTIR) 等分析技术,研究了碳钢Q235在湿热SO2气氛中的腐蚀行为和锈巢形成机制.结果表明: Q235在不同浓度SO2中腐蚀速率的变化趋势是不同的.浓度较高时, 腐蚀速率随腐蚀时间延长而降低; 浓度较低时, 腐蚀速率随腐蚀时间延长缓慢增加.提高SO2浓度对锈层中含硫化合物的形成影响不大,但对锈层中氧化物或氢氧化物形成起到 促进作用.实验条件下的腐蚀产物均含有FeSO4×7H2O, Fe2(SO4)3}×9H2O,γ-FeOOH和无定形的δ-FeOOH, 当SO2体积分数大于0.5%时, 产物中还出现α-FeOOH. 在0.05%SO2气氛中, Q235表面形成锈巢, 锈巢内、外的各种元素含量差 异很大.
The influence of the different concentration of SO2 on the initial atmospheric corrosion of carbon steel Q235 was investigated.The corrosion kinetics of carbon steel Q235 in different condition was researched .The variation of thickness loss of Q235 in different concentration of SO2 made a great difference. Fourier transform infrared spectroscopy(FTIR) and electron dispersion X-ray analysis(SEM／EDAX)were used to characterize the corrosion products of Q235．The effect of S and O elements in the layer of rust are discussed the mechanism of rust nests is analysed. A probable mechanism is presented to explain the experimental results．
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