The Development of Corrosion Inhibitor for Stainless Steel in the High Temperature Concentrated Aqueous Solution of Lithium Bromide
Norio UEDONO, Hidemasa NONAKA and Yoshimi SAKAGUCHI
Abstract:The new inhibitor for stainless steels (mainly high purity ferritic stainless steels) in the high temperature concentrated aqueous solution of lithium bromide was investigated. According to the results of the electrochemical measurements, and the immersion tests using autoclaves, the mixture of three chemicals, LiOH+Na2SO3+SbCl3, is effective as an inhibitor for stainless steels to prevent hydrogen generation, pitting corrosion and macro-cell corrosion with copper. The reasons of this result are assumed that the sodium sulfite in this inhibitor remains the free-corrosion potential of stainless steels lower, and antimony in this inhibitor prevents hydrogen generation. This inhibitor also prevents stress corrosion cracking of austenitic stainless steels in the high temperature concentrated aqueous solution of lithium bromide. Key Words:corrosion inhibitor, stainless steel, lithium bromide, absorption cycle