How does galvanic corrosion primarily affect steel bridge components?

Angel Patricio Garcia

“Galvanic corrosion primarily affects steel bridge components through an electrochemical process that occurs when two dissimiliar metals are electrically connected in the presence of an electrolyte, such as water containing salts. in steel bridges, this typically happens when steel contacts another metal like aluminum or copper, especially in areas exposed to moisture and de-icing salts, with the steel acting as the more active anode that corrodes preferentially while the other metal corrodes more slowly or not at all. This accelerated corrosion leads to material loss and reduced structural capacity in the affected component, and because its often concentrated near the connection point between the two metals, it can significantly more aggressive and damaging than uniform corrosion spread across a surface.”

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Kareem Hesham Mahmoud Awad

“Galvanic corrosion primarily affects steel bridge components through an electrochemical process that occurs when two dissimilar metals are electrically connected in the presence of an electrolyte, such as water containing salts. The more active metal (the anode) corrodes at an accelerated rate, while the less active metal (the cathode) corrodes at a slower rate or not at all. In steel bridges, galvanic corrosion can occur when steel is in contact with another metal, like aluminum or copper, particularly in areas exposed to moisture and de-icing salts. The steel acts as the anode and corrodes preferentially, leading to a loss of material and a reduction in the structural capacity of the affected component. This type of corrosion is often localized near the connection point between the two metals and can be significantly more aggressive than uniform corrosion.”

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