通过失重法、动电位极化扫描、交流阻抗测试等方法研究抗硫碳钢在 CO2/H2S共存的3%NaCl溶液中的腐蚀电化学行为。结果表明：在30℃时，溶液的pH值愈小，硫化膜在电极表面上的沉积量愈少，阴、阳极极化的程度越低；溶液的pH值降低，硫化膜由富S型转变为保护性较弱的富Fe型，且Cr（OH）3和Cr2O3 含量的降低，在一定程度上降低了硫化膜的保护作用。溶液的pH=4和 H2S浓度>100 mg/L时，H2S对抗硫碳钢的阳极过程无促进作用；溶液的pH=2时，随H2S浓度的增大，电极反应为 H+的自催化反应。
The corrosion electrochemical behavior of anti-sulfur carbon steel in 3% NaCl solution containing CO2/H2S was investigated by mass loss test, potentiodynamic polarization curves, electrochemical impedance spectrum. The results showed that more quickly sulfuration film dissolved, more less was there sediment on the exterior of electrode with pH reduction at 30℃. In addition, reduction of pH makes product film turn into rich--sulfur from rich-iron and contents of Cr(OH)3 and Cr2O3 reduce，all which weaken protection of product film and then corrosion rate at pH=2 was more rapid than that when at pH=4. H2S could not accelerate to anode process of anti--sulfur carbon steel when pH=4 and H2S concentration was bigger than 100 mg/L，moreover electrode reactions still were self--catalyzed reaction of acid with increase of concentration of H2S.
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