This problem asks to suggest three methods other than cathodic protection for reducing corrosion of a steel heat exchanger containing brine solution as the cooling medium, which contains some dissolved oxygen.
This environment seems to be a corrosive one since it includes moisture, salts and heat. Thus, steel needs to be protected from these corrosive agents. The suggestions for protection are listed below.
1) Using inhibitors: This method may be the best and most economical way to protect steel in closed systems from corrosion. Inhibitors are substances that, when added in relatively low concentration to the environment, decrease its corrosiveness. They reduce corrosion by several mechanisms, such as eliminating chemically active species in the solution (dissolved oxygen) or inhibitor molecules attach themselves to the corroding surface or form a very thin protective coating.
2) Coating inside the steel surface (lining) with a film of metallic non-reactive coating: This can resist the corrosive environment. The coating will maintain a high degree of surface adhesion, which undoubtedly requires pre-application surface treatment.
3) Reduce or eliminate salts in the environment. This suggestion involves changing the cooling medium from brine solution to freshwater. This will reduce the metal corrosion because of the lower salt content in the environment.
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