Galvanic corrosion is most likely to occur at the interface of a steel fastener and an aluminum alloy inspection plate in the presence of an electrolyte.

Galvanic corrosion is most likely to occur at the interface of a steel fastener and an aluminum alloy inspection plate in the presence of an electrolyte.

• A. True
• B. False
• C. Only at high temperature
• D. Only with copper

Answer: (A)

Galvanic corrosion happens when two dissimilar metals touch in a conductive electrolyte. The more active metal becomes the anode and corrodes, while the more noble metal acts as the cathode. A steel fastener in contact with an aluminum alloy plate forms that galvanic pair, and the presence of an electrolyte completes the circuit so current can flow and metal at the anodic surface dissolves. In this pair, aluminum is typically the anodic metal, so corrosion tends to occur at the interface where they meet. This can happen even at normal temperatures and is not limited to copper-containing situations, making the statement true.

Galvanic corrosion happens when two dissimilar metals touch in a conductive electrolyte. The more active metal becomes the anode and corrodes, while the more noble metal acts as the cathode. A steel fastener in contact with an aluminum alloy plate forms that galvanic pair, and the presence of an electrolyte completes the circuit so current can flow and metal at the anodic surface dissolves. In this pair, aluminum is typically the anodic metal, so corrosion tends to occur at the interface where they meet. This can happen even at normal temperatures and is not limited to copper-containing situations, making the statement true.