Which of the following is NOT a method to control galvanic corrosion?

• A. Thermal Spraying
• B. Design
• C. Electrical Isolation
• D. Barrier Coatings

Answer: (A)

Galvanic corrosion happens when dissimilar metals are electrically connected in an electrolyte, so controlling it means stopping the electrochemical cell from forming or from carrying current. The direct ways to do this are to choose metals with small potential differences (design), to keep the metals electrically separate with non-conductive barriers (electrical isolation), and to apply barrier coatings that prevent electrolyte from reaching the metal surfaces. Thermal spraying is a coating process used for protection, but it isn’t a direct method for controlling galvanic corrosion. It doesn’t inherently break the electrical connection or guarantee that the electrolyte can’t reach the metals, unless used in a very specific, non-conductive barrier context—which isn’t its general purpose. So, it isn’t considered a standard galvanic corrosion control method.