Abstract
By using acrylic acid copolymer, sodium citrate, hydrolyzed polymaleic anhydride (HPMA), corrosion inhibitor D and Zn2+ synergist as raw materials, a multi-component phosphate-free corrosion and scale inhibitor was developed. The performance of the composite phosphate-free corrosion and scale inhibitor was evaluated using the rotary hanging sheet corrosion test, the static scale inhibition test and the corrosion electrochemical test. And the surface morphology of the carbon steel was observed by scanning electronic microscope (SEM). Orthogonal experiment results indicated that the optimal mass ratios of amino acid: Zn2+ synergist: HPMA: corrosion inhibitor D: acrylic acid copolymer was 0.5:10:12:1:8. It was also observed that phosphate-free corrosion and scale inhibitor based on an anodic reaction through the electrochemical corrosion experiment, its annual corrosion rate and scale inhibition rate reached 0.0176 mm·a–1 and 98.3%, respectively, showing excellent corrosion and scale inhibition performance.
Highlights
Industrial recirculating cooling water accounts for 60% 70% in the industrial water, it will result in corrosion, scaling and microbial slime of the equipment and the pipeline as well as reduce their service life without treating
Rotating Hang-Parcel Weight-Loss Experimental Performance Analysis. The inhibitor in this experiment composed of A, B (Zn2+ synergist), C (HPMA), corrosion inhibitor D and E
1) A phosphate-free corrosion and scale inhibitor composed of A, B (Zn2+ synergist), C (HPMA), corrosion inhibitor D and E
Summary
Industrial recirculating cooling water accounts for 60% 70% in the industrial water, it will result in corrosion, scaling and microbial slime of the equipment and the pipeline as well as reduce their service life without treating. Low phosphorus corrosion and scale inhibitor is developing rapidly, such as 2-phosphono-1,2,4-tricarboxylic acid butane (PBTCA) and hydrolyzed polymaleic anhydride (HPMA) [2]. The non-phosphorus corrosion and scale inhibitor has obtained new achievements. A multi-component phosphate-free corrosion and scale inhibitor blend composed of acrylic acid copolymer, sodium citrate, hydrolyzed polymaleic anhydride (HPMA), corrosion inhibitor D and Zn2+ synergist was prepared [3,4,5,6,7]. The mechanism of corrosion and scale inhibition was preliminarily investigated by corrosion electrochemistry test and scanning electron microscope (SEM) techniques [8,9,10,11]
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