几种常用管线钢在CO2及H2S/CO2环境中的腐蚀行为

对带状组织级别不同的管线钢在CO2及H2S/CO2饱和的NACE溶液中的腐蚀速率和腐蚀形貌进行了比较分析。结果表明,在CO2饱和的NACE溶液中,带状组织级别越低的材料,发生均匀腐蚀的特征越明显,通过生成保护性膜抵抗腐蚀的能力越强。而带状组织级别越高的材料,发生局部腐蚀,尤其是点蚀的特征越明显。在H2S/CO2饱和的NACE溶液中,带状组织级别越低的材料,越不易发生氢致开裂现象。为了提高管线钢抗CO2及H2S/CO2腐蚀的性能,应控制其带状组织。

Corrosion behavior of some commonly used pipeline steels in CO2 and H2S/CO2 environment

In CO2 and H2S/CO2 saturated NACE solution,the corrosion rate and corrosion forms of the pipeline steel with different level banded structure were analyzed.The results show that in the CO2 saturated NACE solution,the lower the level of banded structure of the material is,the more obvious characteristics of uniform corrosion,and the stronger ability to corrosion resistance by generating protection-film.And the higher the level of banded structure of the material is,the more obvious characteristics of the local corrosion,especially spot corrosion.In H2S/CO2 saturated NACE solution,the lower the level of the banded structure of the materials,the more difficult the occurrence of HIC.In order to improve the corrosion resistance of pipeline steel anti-CO2 and H2S/CO2,its banded structure should be controlled.