| Title: | Flower-like stearic acid/rosehip oil self-assembled layers for copper corrosion protection : t |
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| Authors: | ID Fuchs-Godec, Regina (Author) |
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| Files: |  ChemEngineering-10-00053-v2.pdf (6,87 MB)
MD5: 2B22FF20193465B5FFF585433013716C
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| Language: | English |
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| Work type: | Article |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FKKT - Faculty of Chemistry and Chemical Engineering
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| Abstract: | The corrosion protection of copper in acidic urban rain environments was studied using self-assembled hydrophobic layers (SAHLs) based on stearic acid (SA), with and without rosehip seed oil (RH). The limited durability of fatty acid-based self-assembled layers under acidic conditions was addressed by correlating surface wettability, morphology, and electrochemical behaviour. Contact angle and SEM analyses showed that SA alone forms a moderately hydrophobic but structurally irregular layer, whereas the addition of 2.0 wt.% RH produces a hierarchical micro/nanostructure with near-superhydrophobic characteristics (CA ≈ 149°). Electrochemical measurements in simulated acid rain solutions (pH 5, 3, and 1) revealed a strong pH dependence of protective performance. While SA-derived layers provided effective protection at pH 5, they deteriorated at lower pH due to protonation of carboxylate anchoring groups and electrolyte ingress. In contrast, SAHLs containing 2.0 wt.% RH maintained polarisation resistance in the MΩ cm2 range and inhibition efficiencies above 99% at pH 3, and remained effective even at pH 1. Long-term EIS results indicate a predominantly diffusion-controlled, barrier-type inhibition mechanism associated with defects sealing and interfacial reorganisation. Notably, the rosehip seed oil used is a commercially available, bio-based material with expired shelf life, highlighting the potential of waste-derived resources for sustainable corrosion protection. |
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| Keywords: | copper, rosehip seed oil, green inhibitors, self-assembled hydrophobic layers, long-term experiment |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 09.02.2026 |
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| Article acceptance date: | 24.03.2026 |
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| Publication date: | 21.04.2026 |
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| Publisher: | MDPI |
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| Year of publishing: | 2026 |
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| Number of pages: | 27 str. |
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| Numbering: | Vol. 10, no. 4, [article no.] 53 |
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| PID: | 20.500.12556/DKUM-97914  |
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| UDC: | 620.1/.2 |
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| ISSN on article: | 2305-7084 |
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| COBISS.SI-ID: | 276309763 |
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| DOI: | 10.3390/chemengineering10040053 |
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| Copyright: | © 2026 by the author
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| Publication date in DKUM: | 24.04.2026 |
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| Views: | 406 |
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| Downloads: | 13 |
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| Metadata: |    |
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| Categories: | Misc.
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