Abstract
The mixture consisted of benzotriazole (BTA), chitosan (CTS), polyacrylic acid and zinc salt has been investigated as a corrosion and scale inhibitor of A3 carbon steel in cooling water. The scale and corrosion inhibition efficiency was evaluated by static anti-scaling teat together with rotary coupon test. Compared with the phosphorus corrosion and scale inhibitor, the corrosion inhibition rate and scale inhibition rate of it increased respectively by 2.51% and 1.16%. As the corrosion and scale inhibitor is phosphate-free, it won’t cause eutrophication, considering the product performance and environmental influence, the phosphate-free corrosion and scale inhibitor is superior to the traditional one.
Highlights
With the development of economy, the consumption of industrial cooling water is increasing rapidly
The mixture consisted of benzotriazole (BTA), chitosan (CTS), polyacrylic acid and zinc salt has been investigated as a corrosion and scale inhibitor of A3 carbon steel in cooling water
Compared with the phosphorus corrosion and scale inhibitor, the corrosion inhibition rate and scale inhibition rate of it increased respectively by 2.51% and 1.16%
Summary
With the development of economy, the consumption of industrial cooling water is increasing rapidly. People have to pay more attention to the treatment of the circulating cooling water [1,2]. Dosing reagents into circulating cooling water is the most common method, and through the role of the pharmacy, the corrosion and scaling problem in the pipes will be solved effectively [3,4,5,6]. Phosphorus products are widely used in cooling water system. Because they can cause environmental pollution, an intense research effort is being undertaken to look for the replacement of phosphorus products by more environmentally friendly products [7,8,9,10,11,12]. The previous work has shown that Chitosan is a natural polymer material which has good resistance scale effect; benzotriazole and zinc salts both have corrosion inhibition effect
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