The effect of carbon within corrosion pits of iron in chloride solutions
Research output: Contribution to journal › Article › peer-review
Authors
Colleges, School and Institutes
External organisations
- Institute of Oceanology Chinese Academy of Sciences
- School of Metallurgy and Materials, University of Birmingham
- Diamond Light Source
Abstract
Iron artificial pits have been used in this work to investigate the effect of a carbon-based black layer that can form within a pit during iron dissolution in HCl solutions. Commercial purity iron (99.5%) and high purity iron (99.99+%) have been compared, and a black layer has been observed only in the 99.5% iron pit. It has been found that the formation of a black layer within an iron artificial pit is potential dependent: it can form at applied voltages below 0.2 V(SCE), but not at 0.6 V(SCE). The presence of a black layer can decrease the rate of mass transport inside a pit, which may help to maintain the aggressive acidic solution in an active pit. This effect has been characterised quantitatively via potentiostatic and potential step methods. In addition, the black layer has also been found to induce a small extra resistance in the solution.
Details
Original language | English |
---|---|
Pages (from-to) | 383-390 |
Number of pages | 8 |
Journal | Corrosion Engineering Science and Technology |
Volume | 52 |
Issue number | 5 |
Early online date | 23 Mar 2017 |
Publication status | Published - 4 Jul 2017 |
Keywords
- artificial pit, carbon, Iron, solid corrosion product