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<p>Investigating the corrosion inhibition of air nanobubbles on stainless steel in circulating cooling water systems represents an important step toward green air nanobubbles scale &amp; corrosion inhibition technology. In this paper, the corrosion inhibition effect and influencing mechanisms of air nanobubbles on stainless steel under different cycles of concentration and flow rates were explored. Results from weight loss and electrochemical methods showed that at a cycle of concentration of 2 and a flow rate of 0.2&#xa0;m/s, the corrosion inhibition efficiency of air nanobubbles on stainless steel could reach 53.3%. Electrochemical impedance spectroscopy measurements and surface characterization of corroded coupons revealed several inhibition mechanisms: air nanobubbles reduced the concentration of corrosive ions through adsorption, enhanced the passive film quality, and formed calcium carbonate scale film and bubble layer. Before air nanobubbles adsorption saturation, increasing the cycle of concentration was conducive to the adsorption of corrosive ions and the formation of calcium carbonate scale film. After saturation, a higher cycle of concentration was unfavorable for improving the passive film quality and bubble layer formation. In addition to being beneficial for the adsorption of corrosive ions, an increased flow rate was unfavorable for passive film formation, calcium carbonate scale film formation, and bubble layer formation. Low cycles of concentration and flow rates were essential for the full exertion of air nanobubbles corrosion inhibition effects.</p>

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Inhibition Mechanism of Air Nanobubbles on Stainless Steel Corrosion in Circulating Cooling Water Systems —Effect of Cycle of Concentration and Flow Rate

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Yuling Zhang,
  • Hesheng Zhang,
  • Songtao Liu,
  • Ziyao Xing,
  • Menghao Li,
  • Jinghong Zhang,
  • Shaolei Lu

摘要

Investigating the corrosion inhibition of air nanobubbles on stainless steel in circulating cooling water systems represents an important step toward green air nanobubbles scale & corrosion inhibition technology. In this paper, the corrosion inhibition effect and influencing mechanisms of air nanobubbles on stainless steel under different cycles of concentration and flow rates were explored. Results from weight loss and electrochemical methods showed that at a cycle of concentration of 2 and a flow rate of 0.2 m/s, the corrosion inhibition efficiency of air nanobubbles on stainless steel could reach 53.3%. Electrochemical impedance spectroscopy measurements and surface characterization of corroded coupons revealed several inhibition mechanisms: air nanobubbles reduced the concentration of corrosive ions through adsorption, enhanced the passive film quality, and formed calcium carbonate scale film and bubble layer. Before air nanobubbles adsorption saturation, increasing the cycle of concentration was conducive to the adsorption of corrosive ions and the formation of calcium carbonate scale film. After saturation, a higher cycle of concentration was unfavorable for improving the passive film quality and bubble layer formation. In addition to being beneficial for the adsorption of corrosive ions, an increased flow rate was unfavorable for passive film formation, calcium carbonate scale film formation, and bubble layer formation. Low cycles of concentration and flow rates were essential for the full exertion of air nanobubbles corrosion inhibition effects.