Corrosion Behavior of Carbon Steel in Concentrated LiBr Solution up to 473 K

摘要

In view of the demand for higher operating temperatures in commercial absorption refrigerators, the corrosion behavior of carbon steel in concentrated LiBr solutions was investigated as a function of LiBr concentration and temperature up to 473 K. Carbon steel specimens were exposed in deaerated LiBr solutions for 200 h and the changes in weight were measured. The amount of corrosion increased with temperature when the concentration of LiBr was more than 17 mol kg~(-1), and decreased slightly with temperature in 10 mol kg~(-1) LiBr solution. Lithium hydroxide (0.1 mol kg~(-1)) markedly decreased the amount of corrosion when the LiBr concentration was less than 10 mol kg~(-1), but did not inhibit corrosion at concentrations above 17 mol kg~(-1). Of the several oxo-acid salts tested in this study, molybdate ion was the most effective inhibitor at 473 K as well as at lower temperatures. A specimen oxidized in air at 673 K almost sustained its passivity during exposure to 17 mol kg~(-1) LiBr +0.1mol kg~(-1) LiOH solution at 473 K.