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Shida Li,Xueyu Zhang,Shaokui Zheng,Shoupeng Duan,Jun Cui,Hangyu Zhang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
This study systematically investigated the inhibition mechanism of NaHCO3 for mild steel corrosion in a0.02 M naturally aerated NaCl solution at 40 C (simulating cooling water) and the critical bicarbonate/chloride molar ratio (RC) using visual observations, potentiodynamic polarization curves, andelectrochemical impedance spectroscopy. The corrosion mechanism of an anodic passivefilm formedwith 0.20–0.40 M NaHCO3 (RC = 10) was controlled by a combination of passivation, diffusion, and chargetransfer processes. Electrochemical impedance spectroscopy results showed that, compared to 0.20–0.24 M NaHCO3, a higher NaHCO3 concentration may affect the stability of the passivefilm. A higherchloride concentration of 0.08 M achieved by a higher concentration cycle in the cooling water systemresulted in a lower RC value of 7.5 for NaHCO3. Both NaHCO3 and Na2CO3 showed an identical corrosionmechanism; moreover, the inhibitory effect of Na2CO3 was not dependent on its alkaline pH. Takentogether, thesefindings show the remarkable potential of NaHCO3/Na2CO3 as a commercially available,comparatively cheap, and environmentally acceptable (i.e., no organic pollution, toxicity, oreutrophication risks after discharge) corrosion inhibitor for mild steel in cooling water systems.