The Role of Washers in Preventing Corrosion and Galvanic Attack

Keywords: Washers, Fasteners, Galvanized ScrewsA washer’s job isn’t just mechanical. When connecting dissimilar metals (e.g., a carbon steel bolt to an aluminum frame), galvanic corrosion can occur. Insulating washers made of nylon or plastic break the electrical path, preventing this destructive reaction. Similarly, using a washer under the head of a galvanized screw on a softer material can prevent the zinc coating from being scraped off during tightening, preserving its corrosion protection. This piece explores the often-overlooked electrochemical role of washers.