Inhibitory Performance of Spinach Extract on the Corrosion of Q235 Steel in a Citric Acid System
Received date: 2023-06-26
Revised date: 2023-07-16
Accepted date: 2023-08-20
Online published: 2024-01-08
were studied by calculation. Results showed that chlorophyll was the main component of SPE, which exhibited good stability in a 0.5 mol/L CA solution. Furthermore, SPE significantly reduced the corrosion rate of Q235 steel in the 0.5 mol/L CA medium, acting as a mixed corrosion inhibitor for both cathodic and anodic reactions. With the increase of SPE concentration, both cathodic and anodic currents were reduced, active corrosion sites were blocked, the corrosion rate was decreased, and the corrosion inhibition efficiency was enhanced. The corrosion inhibition efficiency of Q235 steel obtained by weight loss method, PDP, LPR and EIS was more than 80% with 2.134 g/L of SPE concentration at 303 K. With the increase of system temperature, the corrosion inhibition efficiency of SPE on Q235 steel decreased, but the change was smaller. Compared to the blank system, the activation energy (Ea) of the system significantly increased after the addition of SPE. The effective components of SPE adsorped to the surface of Q235 steel in accordance with the Langmuir isotherm, predominantly through physical adsorption, and were characterized as monolayer adsorption. SPE exhibited good corrosion inhibition performance for Q235 steel in a 0.5 mol/L CA solution system, which was a green corrosion inhibitor with good application prospects in the pickling field. It could provide certain guidance for the development of plant extract-based corrosion inhibitors.
LIU Xinhua, WANG Ying, LUO Baojing, ZHANG Yuan, LI Fanlin, LIU Huiyuan, HU Haifeng, SHU Shili, ZHANG Qing, WANG Lei, LIU Siyu, GU Linyan, ZHANG Guowei . Inhibitory Performance of Spinach Extract on the Corrosion of Q235 Steel in a Citric Acid System[J]. Materials Protection, 2023 , 56(12) : 65 -78 . DOI: 10.16577/j.issn.1001-1560.2023.0290
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