The corrosion inhibition performance of air nanobubbles (A‐NBs) is expected to address the environmental problems arising from chemical corrosion. In order to regulate the corrosion inhibition performance of A‐NBs, the particle characteristics of A‐NBs in flowing composite salt solutions are investigated, and the corrosion inhibition effect of A‐NBs under different concentration ratios and rotational speed of simulated circulating cooling water is studied. High salt concentrations significantly reduced the particle size, concentration, and zeta‐potential value of A‐NBs, thus reducing the stability of A‐NBs. The flow velocity has a slight effect on A‐NBs. The results of the weight loss and electrochemical method showed that A‐NBs achieved the highest corrosion inhibition rate of 55% under a concentration ratio of 1.5 and a rotational speed of 100 r min−1. The surface characterization of brass specimens revealed that A‐NBs facilitated the formation of Cu2(OH)2CO3 passivation film, calcium carbonate scale film, and a layer of bubbles on the surface of brass, which subsequently mitigated the erosive impact of the fluid. A‐NBs can adsorb cations and thus reduce the concentration of corrosive ions. However, the increase in concentration ratio and rotational speed impeded the formation of the bubble layer and passivation film.

中文翻译：

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空气纳米气泡的颗粒性质及其对循环冷却水中黄铜腐蚀的抑制机制：浓度比和流速的影响

空气纳米气泡（A-NB）的缓蚀性能有望解决化学腐蚀引起的环境问题。为了调控A-NBs的缓蚀性能，研究了A-NBs在流动复合盐溶液中的颗粒特性，并研究了A-NBs在不同浓度配比和模拟循环冷却水转速下的缓蚀效果。研究过。高盐浓度显着降低了 A-NB 的粒径、浓度和 zeta 电位值，从而降低了 A-NB 的稳定性。流速对 A-NBs 有轻微影响。失重和电化学方法的结果表明，A-NBs在浓度比1.5、转速100 r·min的条件下取得了最高的缓蚀率，达到55%。−1。黄铜样品的表面表征表明，A-NBs 促进了 Cu 的形成2（哦）2一氧化碳3黄铜表面形成钝化膜、碳酸钙垢膜和一层气泡，从而减轻了流体的侵蚀影响。 A-NBs可以吸附阳离子，从而降低腐蚀性离子的浓度。然而，浓度比和转速的增加阻碍了气泡层和钝化膜的形成。