Sometimes, for certain projects, it is necessary to combine different metal materials in the same component. The use of different materials can, of course, lead to corrosion of one of these.
Galvanic corrosion: a few examples.
One of the possible phenomena is galvanic corrosion. This is the accelerated metal corrosion (the less noble of the two) caused by a corrosive element. Contact between two metals with a different potential is therefore never recommended. In some cases, corrosion can occur in materials that would otherwise resist in the same environment. Aluminium is an example, a passive material which (in certain environments) can undergo localised corrosion (e.g. by pitting or crevice corrosion).
Components: damage and risk factors.
What can be the damage to components?
- Deterioration of the surface qualities.
- Reduction in service life (leading to replacement).
And what are the risk factors causing galvanic corrosion?
- Type of material used
Galvanic corrosion: when can it not occur?
Let’s see together when galvanic corrosion cannot occur. Here are the different cases:
- Without electrically conductive junctions
- Between metals without a potential difference
- Without the conduction of an electrolyte.
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