Heat exchangers are usually steel and often coated to reduce corrosion; what coating is commonly used?

Heat exchangers are usually steel and often coated to reduce corrosion; what coating is commonly used?

• A. Paint
• B. A protective coating such as epoxy or similar
• C. Stainless steel
• D. Tin.

Answer: (B)

Heat exchangers need a protective barrier to stop steel from corroding in the fluids and cleaning chemicals they encounter. The most common coating is an epoxy or similar protective polymer. Epoxy coatings adhere strongly to steel, form a dense, impermeable film, and resist many chemicals and cleaning agents, which makes them durable through thermal cycling and service conditions. This combination of strong adhesion, chemical resistance, and practicality for shop or field application is why epoxy-type coatings are preferred over simple paints, which can chip or wear more easily; switching to stainless steel would avoid corrosion but at higher material cost and fabrication changes; tin plating offers some protection but typically doesn’t hold up as well under the demanding, high-temperature, and aggressive service found in many heat exchangers.

Heat exchangers need a protective barrier to stop steel from corroding in the fluids and cleaning chemicals they encounter. The most common coating is an epoxy or similar protective polymer. Epoxy coatings adhere strongly to steel, form a dense, impermeable film, and resist many chemicals and cleaning agents, which makes them durable through thermal cycling and service conditions. This combination of strong adhesion, chemical resistance, and practicality for shop or field application is why epoxy-type coatings are preferred over simple paints, which can chip or wear more easily; switching to stainless steel would avoid corrosion but at higher material cost and fabrication changes; tin plating offers some protection but typically doesn’t hold up as well under the demanding, high-temperature, and aggressive service found in many heat exchangers.