Corrosion behavior of 316 stainless steel inwet CO2 environment
To solve the problem that carbon steel is prone to corrosion during CO2 pipeline transportation,the corrosion behavior of 316 stainless steel was studied.The effects of water content,CO2 partial pressure and Cl concentration on the corrosion behavior of 316 stainless steel were studied by weight loss method,and the corrosion characteristic map was drawn.The low-light morphology of corrosion products was analyzed by scanning electron microscope,and the components of corrosion products were analyzed by X-ray diffractometer.The results show that 316 stainless steel shows good corrosion resistance under the condition of CO2 pipeline transportation,and it is in a mild corrosion state with extremely low corrosion rate.The corrosion rate of 316 stainless steel increases with the increase of water content,decreases with the increase of CO2 pressure,and increases with the increase of Cl-concentration.Cr is the most effective element to prevent corrosion in 316 stainless steel,which can form a dense and extremely thin passivation film on the metal surface.Because the corrosion rate of 316 stainless steel is much lower than that of carbon steel,it can be considered to replace the gathering pipeline with 316 stainless steel in the"hardest hit area"of corrosion.The research provides an important theoretical basis for the selection of CO2 pipeline steel in CCUS.
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