Study on Scale and Corrosion Inhibition Performance of Phosphorus-Free Copolymer Hydroxyethyl Methacrylate-Acrylic Acid-Sodium Allyl Sulfonate

Abstract

A free radical polymerization method was used to synthesize the phosphorus-free copolymer hydroxyethyl methacrylate-acrylic acid-sodium allyl sulfonate (HEMA-AA-SAS). The structure of HEMA-AA-SAS was characterized, and the scale inhibition performance of the copolymer was determined. Near 100% of scale inhibition was achieved when the copolymer concentration was 6 mg/L, suggesting that HEMA-AA-SAS had a significant effect on the inhibition efficiency. The corrosion inhibition performance of the copolymer and the effects under different water quality conditions were determined using a rotating sample method. When the copolymer with 7.5 mg/L was implemented, the corrosion inhibition effect on the carbon steel hanging sheet reached 88.12%. The effects of copolymers on calcium carbonate crystals were analyzed using scanning electron microscopy (SEM) and X-ray powder diffraction (XRD), which showed that the copolymers could destroy crystal morphology effectively. Through the calculation of the corrosion activation energy, the results show that the corrosion activation energy increases and the corrosion reaction rate decreases after the copolymer has been added. The copolymer HEMA-AA-SAS has excellent scale and corrosion inhibition performance.