利用失重法和扫描电镜研究了CO2与嗜热SRB共存条件下X60钢在海底污泥和污水中的腐蚀行为.结果表明: CO2饱和条件下, 随着温度的升高,污泥和污水中腐蚀速率均增加,且含SRB的污泥和污水中X60钢的腐蚀速率均大于不含SRB的腐蚀速率,SEM观察表明, X60钢遭受的破坏以点蚀为主; 随着CO2分压的增大,X60钢的腐蚀速率增大, 且污泥中腐蚀速率大于污水中腐蚀速率.
Corrosion behavior of X60 steel in CO2 and thermophile sulfate-reducing bacteria (SRB) coexisted sludge and sewage, a submarine pipeline encountered environment, were studied by using weight-loss method and scanning electron microscopy (SEM). The results showed that with the increase of temperature, corrosion rate of X60 steel in sludge and sewage saturated with CO2 increased, and corrosion rate in CO2-saturated sludge and sewage with SRB was higher than that without SRB. The morphology of corroded coupon showed characteristics of pitting corrosion. The corrosion rate increased with the increasing CO2 partial pressure at static state, and the corrosion rate in sludge was always higher than that in sewage; moreover, the corrosion rate increased quickly with the rising CO2 partial pressure at dynamic state.
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