The development of corrosion inhibitor for stainless steel in the high temperature concentrated aqueous solution of lithium bromide

摘要

The new inhibitor for stainles steel (mainly high purity ferritic stainless steel) 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 + Na{sub}2SO{sub}3 + SbCl{sub}3, is effective as an inhibitor for stainles steel 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 steel lower, and antimony in this inhibitor prevents hydrogen generation. This inhibitor also prevents stress corrosion cracking of austenitic stainless steel in the high temperature concentrated aqueous solution of lithium bromide.