Preparation of Environmentally Friendly Non-phosphorus Corrosion and Scale Inhibitor

Based on the low molecular weight sodium polyacrylate (PAAS), the corrosion and scale inhibitor with non-phosphorus formula was prepareded by PAAS, sodium molybdate, D-glucose acid sodium, 1, 2, 3-benzotriazole and hexamethylenetetramine in definite proportion. Its anti-scaling performance was evaluated by calcium carbonate deposition method, its corrosion inhibition was evaluated by rotation specimen method and electro chemical method. The best formula is sodium polyacrylate 15 mg/L, D-glucose acid sodium 14 mg/L, 1, 2, 3-benzotriazole 13 mg/L, sodium molybdate 18 mg/L, hexamethylenetetramine 14 mg/L. The scale inhibition efficiency and corrosion inhibition efficiency of the inhibitor were 92.63% and 92.78% respectively. This formula ethibits the characteristics of no phosphorus, non-toxicity, high efficiency and being environmental friendly. There are important economic and use values.