To develop “environment-friendly” inhibitors for the metals used in the absorption refrigeration 1 system, inhibition efficiencies of six different combinations of inhibitors were evaluated in 64wt.%LiBr solution at 160°C. Double and triple combinations of inhibitors, such as lithium molydate (Li2MoO4, inorganic), “thium hydroxide (LiOH, inorganic), and benzotriazole (BTA, organic) were evaluated for their efficiencies in
corrosion inhibition of copper and mild steel. Results from weight-loss tests showed that the double inhibitor combinations were less effective for topper than for mild steel, whereas the triple inhibitor combination of 0.2wt.%LiOH + 0.02wt.%Li2MoO4 + 0.05wt.%BTA was most effective and it showed much better performance than any other double inhibitor
combinations including the commercial products. This formula, of which inhibition efficiency was predicted to be about 83% for copper and 96% for mild steel, can replace the commercial grade inhibitors containing
Lithium Chromate (Li2CrO4). Keywords: Corrosion inhibitor, LiBr solution, Lithium Hydroxide(LiOH), Lithium Molydate(Li,MoO4), Lithium Chromate(Li2CrO4), BTA, Copper, Mild Steel