What happens when dissimilar metals touch?

Galvanic corrosion is caused by self-induced current created by electrical potential of two dissimilar metals in contact with an electrolyte. It can occur when two dissimilar metals (such as copper tube and steel pipe) are connected in the presence of an electrolyte. Fresh potable water is a weak electrolyte.

Beside this, do dissimilar metals cause corrosion?

Painting the active metal (carbon steel or aluminium or zinc) can cause deep holes at coating defects. Galvanic corrosion can only occur if the dissimilar metals are in electrical contact. Therefore the chromium oxide film will not prevent galvanic corrosion.

How can you prevent galvanic corrosion?

Galvanic corrosion can be prevented through a number of methods:

  1. Select metals/alloys as close together as possible in the galvanic series.
  2. Avoid unfavorable area effect of a small anode and large cathode.
  3. Insulate dissimilar metals wherever practical.
  4. Apply coatings with caution.

Are aluminum and steel dissimilar metals?

“Note that aluminum is close in activity with steel. However, they are still dissimilar metals and are subject to considerable galvanic corrosion when in contact in a corrosive atmosphere. “Galvanic corrosion does not occur when dissimilar metals are completely dry,” he wrote.

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