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Effect of extremely high CO2 pressure on the formation of the corrosion film on 13Cr stainless steel

机译：极高的CO2压力对13CR不锈钢腐蚀膜形成的影响

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The corrosion behaviors of 13Cr martensitic steel under different CO _(2) partial pressures (4–28 MPa) were investigated by weight loss tests and surface characterizations. The results show that the corrosion rate of 13Cr steel shows a sharp increase under higher CO _(2) pressure (28 MPa), which reached approximately 20–180 times as large as those under lower CO _(2) pressures (4–12 MPa). Under the lower CO _(2) pressures, a single-layered Cr(OH) _(3) passive film forms and completely covers the steel surface. However, when the CO _(2) pressure reaches 28 MPa, a very different corrosion film which contains an inner Cr(OH) _(3) passive layer and an outer FeCO _(3) layer forms, and the inner passive layer shows local damage. This phenomenon can be explained by the lower pH (～2.75) and the higher H _(2) CO _(3) concentration in the solution under the higher CO _(2) pressure.
机译：通过减肥试验和表面表征研究了不同CO _（2）分压（4-28MPa）下的13Cr马氏体钢的腐蚀行为。结果表明，13Cr钢的腐蚀速率显示在较高CO _（2）压（28MPa）下急剧增加，该压力达到约20-180倍，如下部CO _（2）压力下的大约20-180倍（4-12 MPA）。在较低的CO _（2）压下下，单层Cr（OH）_（3）无源膜形成并完全覆盖钢表面。然而，当CO _（2）压力达到28MPa时，含有内部Cr（OH）_（3）无源层和外部FECO _（3）层形式的非常不同的腐蚀膜，并且内部被动层显示局部伤害。该现象可以通过较高CO _（2）压力下的溶液中的较低pH（〜2.75）和较高的H =（2）CO _（3）浓度来解释。

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