Improved Corrosion Resistance of a Heat Exchanger Using a Copper Tube Coated with Tin

The outer face of copper tubes used in a heat exchanger were coated with tin. The tubes were brazed with various types of solder in order to evaluate their corrosion resistance in a H2S gas environment.Results indicated that a copper tube coated with tin and brased with Sn-Pb and Sn-Ag demonstrates better corrosion resistance than conventional tubes.