- Title
- Corrosion at the Steel–Medium Interface
- Creator
- Melchers, Robert E.
- Relation
- ARC.DP0771695 http://purl.org/au-research/grants/arc/DP0771695 & DP1093787 http://purl.org/au-research/grants/arc/DP1093787 & DP170103737 http://purl.org/au-research/grants/arc/DP170103737
- Relation
- Corrosion and Materials Degradation Vol. 5, Issue 1, p. 52-72
- Publisher Link
- http://dx.doi.org/10.3390/cmd5010003
- Publisher
- MDPI AG
- Resource Type
- journal article
- Date
- 2024
- Description
- Corrosion on the interface between a metal alloy, such as steel, and a wet, permeable non-metallic medium is of considerable practical interest. Examples include the interface between steel and water, the atmosphere or concrete, as for steel reinforcement bars; between metal and soil, as for buried cast iron or steel pipes; deposits of some type, as in under-deposit corrosion; and the interface with insulation, protective coatings, or macro- or micro-biological agents. In all cases, corrosion initiation depends on the characteristics of the interfacial zone, both of the metal and the medium, and the spatial variability. For (near-)homogeneous semi-infinite media with good interfacial contact, the pitting, crevices and general corrosion of the metal will be largely controlled by the metal (micro-)characteristics, including its inclusions, imperfections and surface roughness. In other cases, these may be overshadowed by the macro-characteristics of the medium and the degree of interfacial contact, possibly with severe resulting corrosion. Where the build-up of corrosion products can occur at the interface, they will dominate longer-term corrosion and govern the long-term corrosion rate. For media of finite thickness, diffusion issues and material deterioration may also be involved. The practical implications are outlined. It is argued that with the presence of a suitable medium, it is possible to achieve negligible long-term corrosion but only if certain practical actions are taken.
- Subject
- steel; soil; concrete; deposits; homogeneity; long-term
- Identifier
- http://hdl.handle.net/1959.13/1500488
- Identifier
- uon:54929
- Identifier
- ISSN:2624-5558
- Language
- eng
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