Chemical Cleaning of Boilers

Abstract

Inhibited hydrochloric acid is generally used for removing rust from new boilers and insoluble deposit such as scale from old ones. Addition of reducing phosphoric acid or salt to this acid solution results in high solubility of metal oxides or salts and anticorrosive surface after cleaning, and can clean perfectly marine boilers economically even at room temperatures. Thiourea and its delivertives inhibits the corrosibility of this type of acid and addition of fulfurol or wetting agents lowers this rate of attack. Details of cleaning methods and results with inhibited reducing acid solution have been reported in this essay.