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<p>Polyepoxy succinic acid (PESA) is thoroughly characterized as an effective green inhibitor to prevent scale formation and corrosion in simulated circulating cooling water (SCCW) of synchronous condensers at a high temperature of 60&#xa0;°C. Static scale inhibition tests, weight loss measurements, electrochemical measurements, and surface analysis techniques were conducted to investigate its performance and mechanism. The results indicate that PESA exhibits excellent CaCO<sub>3</sub> scale inhibition, achieving an efficiency of 98.26% at 25&#xa0;mg/L. This is because PESA forms complex species with Ca<sup>2+</sup> ions, thereby converting all calcite aragonite into vaterite. Weight loss data show that the corrosion rate of stainless steel in the simulated solution without PESA gradually increases with the soaking time, while the corrosion rate of 304 stainless steel (304 SS) decreases significantly after the PESA is added. Electrochemical impedance data show that the addition of PESA significantly inhibits the corrosion of 304 SS in SCCW solution. Polarization data display that PESA inhibits both the anodic and cathodic reactions of 304 SS, acting as a mixed-type corrosion inhibitor. The corrosion inhibition efficiency of PESA reaches 99.15% at 15&#xa0;mg/L and 60&#xa0;°C. SEM and XRD scans reveal an efficient coverage of an adsorbed layer on 304 SS surface. It is found that the adsorption of PESA on stainless steel surface obeys the Langmuir adsorption isotherm with chemical adsorption mechanism.</p>

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Study on the Scale and Corrosion Inhibition of Polyepoxy Succinic Acid in Simulated Circulating Cooling Water of Synchronous Condenser

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Yangqian Ye,
  • Xiaochun Chen,
  • Zhonkang Zhou,
  • Xiantao Gu,
  • Qiaozhen Ji,
  • Yuxiang Gao,
  • Jin Zhao,
  • Qiangqiang Liao

摘要

Polyepoxy succinic acid (PESA) is thoroughly characterized as an effective green inhibitor to prevent scale formation and corrosion in simulated circulating cooling water (SCCW) of synchronous condensers at a high temperature of 60 °C. Static scale inhibition tests, weight loss measurements, electrochemical measurements, and surface analysis techniques were conducted to investigate its performance and mechanism. The results indicate that PESA exhibits excellent CaCO3 scale inhibition, achieving an efficiency of 98.26% at 25 mg/L. This is because PESA forms complex species with Ca2+ ions, thereby converting all calcite aragonite into vaterite. Weight loss data show that the corrosion rate of stainless steel in the simulated solution without PESA gradually increases with the soaking time, while the corrosion rate of 304 stainless steel (304 SS) decreases significantly after the PESA is added. Electrochemical impedance data show that the addition of PESA significantly inhibits the corrosion of 304 SS in SCCW solution. Polarization data display that PESA inhibits both the anodic and cathodic reactions of 304 SS, acting as a mixed-type corrosion inhibitor. The corrosion inhibition efficiency of PESA reaches 99.15% at 15 mg/L and 60 °C. SEM and XRD scans reveal an efficient coverage of an adsorbed layer on 304 SS surface. It is found that the adsorption of PESA on stainless steel surface obeys the Langmuir adsorption isotherm with chemical adsorption mechanism.