Title: Effect of Temperature on H_2S/CO_2 Corrosion Behavior of Pipeline Steel
Abstract: Flowing solution environments containing H2S/CO2 were simulated in a high temperature and high pressure autoclave.Corrosion behavior of API-X60 pipeline steels was investigated with scanning electron microscopy(SEM) and X-ray diffraction methodology(XRD).Effects of temperature on corrosion rate and products were discussed.The results show that corrosion rate of X60 steel increases at the beginning and then decreases with temperature increasing,and localized corrosion turns into general corrosion obviously,but pitting is observed at high temperature.Mackinawite(FeS1-X) and FeS composite form as corrosion product in low-temperature condition,with temperature increasing the corrosion products were dominated by lamellar-type Mackinawite crystal and associated with a small amount of Pyrrhotite(Fe1-XS) crystal.However,Pyrrhotite crystal becomes more dominated at higher temperature region.Poor adhesion of corrosion scale leads to a lower covering rate at low temperature.Cathodic effects of scale promote the localized corrosion and a faster anode reaction rate and rapid development of pitting will be achieved without blocked effect.
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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