20.500.12556/DKUM-97914 Flower-like stearic acid/rosehip oil self-assembled layers for copper corrosion protection t 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. copper rosehip seed oil green inhibitors self-assembled hydrophobic layers long-term experiment baker zeleni inhibitorji true false true MDPI Angleški jezik Slovenski jezik https://www.mdpi.com/journal/ChemEngineering © 2026 by the author Članek v reviji 2026-04-24 13:32:20 2026-04-24 13:32:20 2026-04-25 03:09:23 0000-00-00 00:00:00 2026 0 0 27 str. no. 4, [article no.] 53 Vol. 10 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2026-02-09 2026-03-24 2026-04-21 620.1/.2 276309763 10.3390/chemengineering10040053 2305-7084 ChemEngineering-10-00053-v2.pdf ChemEngineering-10-00053-v2.pdf 1 2B22FF20193465B5FFF585433013716C 75b67b9ddb53e8ed11ede678ba6fbc06f954bc7752e942680b74fbb81e629096 ca6938ab-3fd1-11f1-903d-00155d0001a1 https://dk.um.si/Dokument.php?lang=slv&id=205618 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0