Copolymers composed of the acrylic acid (AA) and acrylamide (AAm) derivatives were synthesized and these inhibition effects on corrosion of steels were investigated in cooling water systems. In particular, the relationship between the component and composition, and the inhibition ability of the copolymers was discussed. In a high concentrated solution, the copolymers at AA/AAm molar ratio of 5/1 showed the most effective as inhibitors. In the substituent effect of amido group (-CONR
2), the inhibition ability of the copolymer increased in the order of (R=)H (acrylamide: AAm)<CH
3 (dimethyl acrylamide: DMAAm)<C
2H
5 (diethylacrylamide: DEAAm). In low and high concentrated solutions, the copolymer at number average molecular weight of ca. 10
4 depressed strongly the corrosion of steel.
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