| Title: | On the use of the Langmuir and other adsorption isotherms in corrosion inhibition |
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| Authors: | ID Kokalj, Anton, Institut "Jožef Stefan" (Author) |
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| Files: |  PDF - Presentation file, download (2,79 MB)
MD5: 4975A672112391283CB4AD0F3D6ECF30
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  IJS - Jožef Stefan Institute
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| Abstract: | In corrosion inhibition studies, the standard adsorption Gibbs energy is often estimated via the linear regression of the Langmuir isotherm in the �∕� = 1∕� + � form, where both the intercept and the slope are estimated, although the Langmuir isotherm requires the slope of 1. Hence, �∕� = 1∕� +�� is actually used, where � is the slope. Herein, a theoretical basis for this equation is established. It is demonstrated to be an effective equation that can decently describe various adsorption models and provide relatively accurate estimates of the standard adsorption Gibbs energy, provided surface coverages are reliably determined experimentally. However, any significant deviation from the slope of 1 signals non-Langmuir adsorption due to inter-adsorbate interactions, multi-site adsorption, or surface heterogeneity. Among these three causes, only attractive inter-adsorbate interactions lead to a slope of less than 1. |
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| Keywords: | Langmuir isotherm, Flory–Huggins isotherm, Temkin isotherm, corrosion inhibition, standard adsorption free energy |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 16.12.2022 |
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| Article acceptance date: | 14.03.2023 |
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| Publication date: | 20.03.2023 |
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| Publisher: | Elsevier |
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| Year of publishing: | 2023 |
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| Number of pages: | str. 1-15 |
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| Numbering: | Vol. 217, [article no.] 111112 |
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| Source: | Nizozemska |
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| PID: | 20.500.12556/DiRROS-22092  |
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| UDC: | 620.1/.2 |
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| ISSN on article: | 1879-0496 |
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| DOI: | 10.1016/j.corsci.2023.111112 |
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| COBISS.SI-ID: | 146303491 |
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| Copyright: | © 2023 The Author(s). |
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| Note: | Nasl. z nasl. zaslona;
Opis vira z dne 23. 3. 2023;
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| Publication date in DiRROS: | 23.04.2025 |
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| Views: | 710 |
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| Downloads: | 205 |
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| Metadata: |    |
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