Title: CORROSION BEHAVIOR OF NT80SS STEEL IN ENVIRONMENT OF HIGH CONTENTS OF H2S AND CO2
Abstract: Corrosion behavior and corrosion influencing factors(total pressure,temperature,corrosion time, Cl~-,velocity of flow)of NT80SS casing steels were studied in simulating corrosion environment with high contents of H_2S and CO_2 in Luojiazhai Gas Field by loss weight corrosion,and corrosion scale was analyzed by potentiodynamically scan,electrochemical impedance spectroscope(EIS)and scanning electron microscope(SEM). The results show that 60℃was the temperature at which corrosion rate of NT80SS steel was the lowest among temperatures tested in this paper.When the total pressure was 9 MPa or above it,corrosion rate at 120℃)was lower than that at 90℃.However,the total pressure was less than 9 MPa,the result is contrary.Corrosion rate was decreasing with time prolonging;Cl~- promoted corrosion of steel.Corrosion rate increased with accelerated velocity of flow.The electrochemical experiments show that:in the range of 30℃-120℃,Resistance performance and compact character of the corrosion scale formed at 60℃was the most outstanding among those formed at others temperature,and the anodic polarization rate is high,so corrosion rate of the steel at 60℃is the lowest.
Publication Year: 2009
Publication Date: 2009-10-10
Language: en
Type: article
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Cited By Count: 1
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