The electrochemical behavior of low carbon steel in acidic simulation solutions containing different concentrations of H2S at 90℃was investigated by mass loss method,electrochemical measurements and observations of scanning electron microscope（SEM） and X-ray radiation diffaction（XRD）.The results showed that the cathodic depolarization was enhanced greatly and the corrosion rate of carbon steel increased remarkably with the increase of H2S concentration.The severe corrosion holes were observed on the carbon steel surface in the H2S-containing solutions.The corrosion products layer deposited on carbon steel were mainly composed of mackinawite,which became loose,easily cracked and sloughed off with increasing concentration of H2S.
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