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首页> 外文会议>Associazione Italiana Di Metallurgia;Dechema;Annual event of the European Federation of Corrosion on European Corrosion Congress;uropean Federation of Corrosion >Assessment of Localized Corrosion Resistance of 13Cr, 15Cr and 17Cr Stainless Steels in high chloride and CO_2 environments
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Assessment of Localized Corrosion Resistance of 13Cr, 15Cr and 17Cr Stainless Steels in high chloride and CO_2 environments

机译：在高氯化物和CO_2环境中13Cr，15Cr和17Cr不锈钢的局部耐蚀性评估

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The supermartensitic stainless steels are Fe-Cr-Ni-Mo alloys with low carbon content,rnbesides addition of Ni (4 to 6%) and Mo (to 2,5%), presenting better mechanicalrnproperties, corrosion resistance and weldability than the conventional martensitic stainlessrnsteels. Their main applications are in oil and gas industry as a practical and economicalrnalternative to be selected as structural materials. This study aims to make a comparativernanalysis of the behavior of supermartensitic stainless steels of different Cr contents, suchrnas 13Cr, 15Cr and 17Cr, in environments with high chloride (150000ppm) and CO_2, atrntemperatures of 25℃ and 85℃. Anodic polarization and electrochemical impedancernspectroscopy (EIS) were used. The results showed that, at 25℃, all the studied steelsrnpresented a stable passive range, characteristic of a stable and protective film formed onrnthe steel surface. The 17Cr steel presented the highest passivation range at 25℃. Withrnincreasing temperature, only the 17Cr steel presented a stable passivation range. Thern13Cr and 15Cr steels showed higher anodic currents at lower anodic potentials,rnsuggesting an active to passive transition, and higher current densities within their passivernrange when compared with the same values obtained with the 17Cr stainless steels. Thernresults of this study demonstrated that the 17Cr stainless steel presented a higherrnlocalized corrosion resistance in environments with high chloride and CO_2, at temperaturesrnwithin 25℃ and 85℃.
机译：超级马氏体不锈钢是碳含量低的Fe-Cr-Ni-Mo合金，除了添加Ni（4％至6％）和Mo（至2,5％）外，与常规马氏体相比，具有更好的机械性能，耐腐蚀性和可焊性。不锈钢。它们的主要应用是在石油和天然气工业中作为一种实用和经济的替代品，被选作结构材料。本研究旨在比较不同Cr含量的超马氏体不锈钢（如13Cr，15Cr和17Cr）在高氯化物（150000ppm）和CO_2的环境下，在25℃和85℃的温度下的行为。使用阳极极化和电化学阻抗谱（EIS）。结果表明，在25℃下，所有研究钢都表现出稳定的钝化范围，具有在钢表面形成稳定的保护膜的特性。 17Cr钢在25℃时具有最高的钝化范围。随着温度的升高，只有17Cr钢具有稳定的钝化范围。与17Cr不锈钢获得的相同值相比，rn13Cr和15Cr钢在较低的阳极电势下显示出较高的阳极电流，这表明从主动过渡到被动过渡，并且在其被动范围内具有更高的电流密度。这项研究的结果表明，在25℃和85℃的高氯化物和CO_2环境中，17Cr不锈钢具有更高的局部耐腐蚀性。

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