AI Article Synopsis
- - The corrosion of 13Cr martensitic steel increases significantly at higher CO partial pressures, specifically reaching up to 20-180 times the rate seen at lower pressures.
- - At lower CO pressures (4-12 MPa), a protective Cr(OH) passive film completely covers the steel, whereas at 28 MPa, the corrosion film is more complex, featuring both a damaged inner Cr(OH) layer and an outer FeCO layer.
- - The observed corrosion behavior correlates with the acidic conditions (lower pH of about 2.75) and increased HCO concentration in the environment at higher CO pressures.
Article Abstract
The corrosion behaviors of 13Cr martensitic steel under different CO 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 pressure (28 MPa), which reached approximately 20-180 times as large as those under lower CO pressures (4-12 MPa). Under the lower CO pressures, a single-layered Cr(OH) passive film forms and completely covers the steel surface. However, when the CO pressure reaches 28 MPa, a very different corrosion film which contains an inner Cr(OH) passive layer and an outer FeCO layer forms, and the inner passive layer shows local damage. This phenomenon can be explained by the lower pH (∼2.75) and the higher HCO concentration in the solution under the higher CO pressure.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9076110 | PMC |
| http://dx.doi.org/10.1039/c9ra08373a | DOI Listing |
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