CORROSION INHIBITION OF CARBON STEEL BY MOLYBDATE-BENZOTRIAZOLE MIXED INHIBITOR IN CONCENTRATED LITHIUM BROMIDE SOLUTION AT ELEVATED TEMPERATURE.

Sodium molybdate gives excellent corrosion inhibition for carbon steel in the presence of lithium hydroxide in a solution of 12. 45 mol/l lithium bromide at 160 degree C which is the operating condition of a two stage absorption refrigerator. However, in a low concentration, 0. 001 mol/l, of sodium molybdate the effect decreases. In the presence of 0. 15 mol/l lithium hydroxide, the most effective solution is the 0. 001 mol/l sodium molybdate with added 0. 0015 to 0. 0075 mol/l benzotriazole. In addition, this mixed inhibitor is also effective for galvanic and crevice corrosion inhibition.