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The aim of research was to find additives with different capacities that can control the undesired corrosion and scale formation at the same time. Amino acids with different (carboxymethyl and/or phosphonomethyl) substituents were investigated to prove their multifunctional effectiveness. The most interesting parameters were the number of –COOH and –PO3H2 groups as well as the structure of the side chain in the amino acids. The experimental data proved that both the alkyl side chains (with or without additional carboxy and phosphonic groups) as well as the number of the ionizable substituents in the molecules influence the both efficacies.

N-Substituted amino acids as multifunctional additives used in cooling water. Part II: N-carboxymethyl and phosphonomethyl amino acids