Betel Nut Shell Water Extract as a Green Corrosion Inhibitor for Q235 Steel in 1 M HCl
Zhao Zipeng, Yongbo Yan, Zhengyuan Gao
Abstract
In this work, we prepare the Betel nut shell extract (BNE) as an eco-friendly candidate to replace toxic and difficult to synthesize corrosion inhibitors. Combined with electrochemical tests, gravimetric measurements, morphology observations, adsorption curve, and theoretical calculations, the anti-corrosion ability and absorption mechanism of BNE on Q235 steel in 1 M HCl is explored. As shown in electrochemical results, BNE can reduce steel cathodic and anodic dissolution rates, and the highest η value is 93.1%. The high-efficiency inhibition ability corresponds to a stable and dense BNE film assembled between the HCl/steel substrate interface. Theoretical calculations further reveal the possibility of BNE molecules' parallel adsorption on the steel surface from the molecular level. Ultimately, this work can accumulate experience for the industrial application of plant extractant corrosion inhibitors.