Electrochemical Processes at Metallic Electrodes—Corrosion and Protection

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Corrosion and Protection".

Deadline for manuscript submissions: closed (31 March 2022) | Viewed by 3619

Special Issue Editor


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Guest Editor
Department of Materials Science, Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Żwirki i Wigury 4, 35-036 Rzeszów, Poland
Interests: corrosion of aluminium alloys; anodising and plasma electrolytic oxidation of light metals; recycling of noble metals

Special Issue Information

Dear Colleagues,

Industrial and post-industrial societies are based on metals. Those that are most commonly applied react with the environment to a greater or lesser extent. Thus, corrosion is an important problem affecting human safety, the environment, and the economy. The most spectacular examples include the collapse of buildings and bridges, accidents in chemical plants and nuclear power plants, oil leaks from pipelines, and pollution of drinking water. The global cost of corrosion was estimated by the National Association of Corrosion Engineers (NACE) as 3.4% of the global gross domestic product. Corrosion affects the global demand for metal, decreasing their reserves and increasing the environmental pollution caused by mining and metallurgy. Thus, efficient corrosion protection strategies are necessary, which are based on scientific corrosion studies.

This Special Issue will present research articles describing the mechanisms for electrochemical corrosion of metals as well as means of corrosion protection. Nowadays, especially interesting issues related to these are, e.g., the replacement of toxic elements used in corrosion protection such as Cr(VI), development of self-healing anticorrosion coatings, a better understanding of passivity and the mechanisms of breakdown of the passive layer, in addition to green corrosion inhibitors.

Dr. Przemysław Kwolek
Guest Editor

Manuscript Submission Information

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Keywords

  • metals and alloys
  • corrosion
  • corrosion inhibitors
  • electroplating
  • passivity
  • protective coatings
  • conversion coatings

Published Papers (1 paper)

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Research

17 pages, 3815 KiB  
Article
Gallic Acid as a Potential Green Corrosion Inhibitor for Aluminum in Acidic Solution
by Przemysław Kwolek, Kamil Dychtoń, Barbara Kościelniak, Andrzej Obłój, Agnieszka Podborska and Marek Wojnicki
Metals 2022, 12(2), 250; https://doi.org/10.3390/met12020250 - 28 Jan 2022
Cited by 12 | Viewed by 3134
Abstract
Plant extracts are intensively studied as green corrosion inhibitors of aluminum. Because these extracts are complex systems, the influence of their individual constituents on the corrosion of aluminum should be determined. In this work, gallic acid was tested for the first time as [...] Read more.
Plant extracts are intensively studied as green corrosion inhibitors of aluminum. Because these extracts are complex systems, the influence of their individual constituents on the corrosion of aluminum should be determined. In this work, gallic acid was tested for the first time as a corrosion inhibitor of aluminum in orthophosphoric acid aqueous solution. So far, its potential inhibiting properties in acidic solutions were only suggested based on promising results obtained for various plant extracts. Evaluation of the potential inhibiting properties of gallic acid was performed using electrochemical methods. The corrosion potential, polarization curves, and impedance spectra of aluminum in 0.5 M orthophosphoric acid, at T = 303 K, were determined. The corrosion potential, corrosion current density, and corrosion rate of aluminum in orthophosphoric acid were equal to −1.151 V vs. Ag|AgCl (3M KCl) reference electrode, 36 μA∙cm−2 and 0.39 mm∙year−1, respectively. These values did not change with the addition of gallic acid. The results obtained show that gallic acid does not inhibit aluminum corrosion. UV-Vis absorption spectra of gallic acid solutions and quantum mechanical calculations show that this organic compound did not adsorb onto the aluminum surface under the studied conditions. Full article
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