Contact corrosion in metal pairings

Not all metals are compatible. Touching metals with different intrinsic potential may cause contact corrosion under certain circumstances. So what you have to pay attention to and how to avoid contact corrosion, you can read here.

Origin of contact corrosion

Every metal has its own electrical potential due to its alloy and its chemical properties. If two different metals with different self-potential are present in the presence of an electrolytic conductor (for example water), a current flow occurs.

This randomly generated galvanic cell causes metal ions to dissolve, and one of the two metals can corrode - depending on the potential difference.

avoidance

  • Reduction or avoidance of the potential difference due to the material selection
  • Structural separation through an intermediate layer
  • Preventing contact with electrolytic conductors (which may be difficult, as some pairings may already be humid)

Tips & Tricks

Copper and iron should never be next to each other; stainless steel and non-ferrous ferrous metals should also be structurally separated to avoid contact corrosion.

Video Board: 8. Metals and Cheeses - Uncoventional Pairings