Did you know that placing two different metals in contact with each other can result in corrosion — even without exposing them to road salt? For example, it can occur when aluminum brackets are mounted on steel-frame rails or when galvanized-steel piping is attached to stainless-steel pumps.

The cause is a reaction called galvanic corrosion, which transfers electrons between the two metals. Over time, this flow of electrons shows up as pitting and corrosion on one of the metals, which can weaken its structure.

The best way to avoid galvanic corrosion is to put the same metals in contact with each other — steel brackets on steel-frame rails, and stainless-steel piping on stainless-steel pumps, for example. For pump systems, the next best way is to install replaceable metal anodes that get attacked by the corrosion instead of the metal components themselves. See your apparatus or pump dealer for specific advice on dealing with galvanic corrosion.

About this feature
This new feature will offer a variety of short tips and facts about apparatus maintenance and testing. Look for it every month. Submissions of 150 words or less are welcome, subject to editing. Send them to Senior Editor Chris Cavette.