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Abstract
The aim of the present work is to design different environmentally friendly polymers used as scale and corrosion inhibitors in cooling water systems in industry to solve the problem occurring in this field. Twenty one copolymers were prepared as well as commercial one, were evaluated by different laboratory studies.
The results show that eleven copolymers have the best and most effective inhibition efficiency. Using very small doses 1,3,5 and 10 ppm are enough to give high efficiency. These polymers are : Acrylic Acid – Acrylamide copolymer ( AA - AAm ) with ( 1 : 1 ) molar ratio, low and medium molecular weight, Acrylic Acid – 2-Acrylamido 2- Methyl 1- Propane Sulphonic Acid copolymers ( AA – APSA ) with (1 : 1 ) and ( 3 : 7 ) molar ratio, ( AA – AAm ) with (1 : 9) and (2 : 8) molar ratio, Vinyl Sulphonic acid – Acrylamide copolymer (VSA – AAm) with (1: 1) molar ratio and three types of Styrene Sulphonic Acid Sodium salt – Acrylic acid copolymers( AA – SSANa ) ( 1 : 1 ) molar ratio with different additives. These polyelectrolytes are evaluated as scale and corrosion inhibitors with different studies such as : calcium phosphate and calcium carbonate inhibition, zinc stabilization ,kaolin and iron oxide disperancy. Also the effect of pH value on the efficiency was studied. Small doses of polymers give moderately accepted efficiency in industry ( more than 80 %) especially with ( AA- SSANa ) copolymers . The effect of molar ratio and the type of monomers used in the synthesis of these copolymers were studied.
Corrosion rate measurement of the most effective prepared copolymers indicated that these polyelectrolyes decrease the corrosion rate by different values , this is due to its chemical structures and the presence of mercaptant and the amino group present in ( DMF ) and of acrylamide, also the sulphonic group.