Journal
ELECTROCHIMICA ACTA
Volume 397, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.139225
Keywords
Zinc; Humic acid; Corrosion inhibitor; Electrochemical impedance spectroscopy; FTIR-ATR
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Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Instituto Federal de Educacao Ciencia e Tecnologia do Rio Grande do Sul (IFRS), (Farroupilha, Brazil)
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The corrosion of Zn-coated steels in NaCl solution containing humic acid was studied, showing that humic acid initially slightly promoted corrosion but eventually acted as an inhibitor with an efficiency of around 90%. The formation of a secondary passive layer containing Zn humate was found to block the lateral growth of pits caused by corrosion.
Aiming to simulate the corrosion of Zn-coated steels in soils containing high quantities of organic matter, we studied the corrosion of Zn in 0.1 M NaCl containing 2 g.L-1 humic acid (HA). Up to around 4 h exposure, HA slightly promotes corrosion, while after 20 h, it acts as an inhibitor reaching efficiencies around 90%, as inferred from EIS and mass loss data. Voltammetry and EIS evidenced the slow formation of a secondary passive layer that explains the HA inhibition. FTIR and XPS spectroscopy showed that the additional layer contains Zn humate, which blocks the lateral growth of pits, as observed by SVET (scanning vibrating electrode technique). (C) 2021 Elsevier Ltd. All rights reserved.
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