Corrosion activity of carbon steel b450c and low chromium ferritic stainless steel 430 in cement extract solution
This study compares corrosion activities of carbon steel B450C and SS 430 (Mn in low content) exposed for 30 days in cement extract solution. Iron oxide and hydroxide were formed as corrosion products, in addition to CaCO, in the presence of CrO on SS 430. Because of the decrease in pH, B450C lost t...
| Authors: | , , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2021 |
| Country: | España |
| Institution: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repository: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/258057 |
| Online Access: | http://hdl.handle.net/10261/258057 |
| Access Level: | Open access |
| Keyword: | Carbon steel Stainless steel Concrete pore Cement extract Corrosion tests XPS |
| Summary: | This study compares corrosion activities of carbon steel B450C and SS 430 (Mn in low content) exposed for 30 days in cement extract solution. Iron oxide and hydroxide were formed as corrosion products, in addition to CaCO, in the presence of CrO on SS 430. Because of the decrease in pH, B450C lost the passive state when OCP shifted to negative values, while SS 430 showed positive OCP values, maintaining its passive state. The SEM images confirmed that the corrosion attack on the surface was less aggressive for SS 430. The Nyquist plots of EIS initially showed capacitive behavior and later changed to semi-linear diffusion impedance, which SS 430 maintained firmly. The phase angle Bode diagrams confirmed these changes. Two equivalent circuits were applied. The calculated values of R for SS 430 increased over time (protective passive layer mainly of CrO oxide), while for carbon steel, R reached maximum value after 168 h and then decreased, maintaining minimum values approximately five orders lower than those of the stainless steel. |
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