In-situ study on hydrogen permeation inhibition by corrosion inhibitors during localized corrosion via permeating hydrogen signal

TiO2 nanoparticles as corrosion inhibitors on carbon steel

Harnessing the biomimetic superhydrophobic shell matrix onto Mg alloy: One-step electrodeposition preparation and corrosion inhibition

Dual-functional binary inhibitor of DDBAC and DMOAP for 7050 aluminum alloy in microbial media: Synergistic Antibacterial and corrosion inhibition

Inhibition of SRB-induced corrosion of X65 steel by Bacillus sp.: Microbial competition and biomineralized film formation

A novel eco-friendly and bifunctional ionic liquid with superior corrosion and microbial inhibition for L245 steel in CO₂-saturated oilfield environment

The development of sustainable corrosion mitigation strategies is essential for protecting metallic materials in aggressive environments. In this study, Desmodium adscendens (Sw.) DC. extract (DAPE) was investigated as a bio-based corrosion inhibitor for carbon steel in hydrochloric acid. A central composite design integrated with response surface methodology (CCD–RSM) was employed to quantify and optimize the combined effects of acid concentration, temperature, inhibitor concentration, and immersion time on weight loss (WL), corrosion rate (CR), and inhibition efficiency (IE). The resulting quadratic models exhibited high statistical reliability and predictive accuracy (R² = 0.9881 for WL, 0.9743 for CR, and 0.9685 for IE). Analysis of variance identified acid concentration and temperature as the dominant factors accelerating corrosion, whereas increasing DAPE concentration significantly reduced WL and CR while enhancing IE. Optimal inhibition performance was achieved at 0.80 g/L DAPE in 2 M HCl at 323 K, yielding WL = 0.027 g, CR = 0.0011 g·cm⁻²·h⁻¹ , and IE = 85.02 %. Numerical optimization predicted comparable values (WL = 0.027 g; CR = 0.0010 g·cm⁻²·h⁻¹; IE = 85.32 %), which were experimentally validated within a 95 % confidence interval. Electrochemical impedance spectroscopy and potentiodynamic polarization analyses confirmed that corrosion inhibition occurs through adsorption of DAPE phytochemicals, forming a compact, adherent, and electrically resistive interfacial film that suppresses both anodic dissolution and cathodic hydrogen evolution. The inhibitor exhibited mixed-type behavior without altering the intrinsic corrosion mechanism. Surface morphology analysis further corroborated the formation of a smooth and protective layer on the steel surface. These findings demonstrate the potential of DAPE extract as an effective, sustainable, and environmentally benign corrosion inhibitor for carbon steel in acidic media.

Soybean-residue carbon carbon quantum dots as corrosion inhibitor for copper‑nickel alloy in H2SO4 medium

Mikania micrantha-derived carbon dots as an efficient corrosion inhibitor for steel in HCl media

Dual-functional corrosion inhibitors from biomass-derived N, Br-carbon dots via adsorption film protection and fluorescence response

Structural elucidation of a novel dual-substituted thiosemicarbazone scaffold as an efficient copper corrosion inhibitor: Insights from RSM, XPS, and DFT–Fukui analyses

Fructus broussonetiae extract as a biodegradable plant-based corrosion inhibitor for Q420 steel in acidic media: MD/DFT simulations and experimental verification

Surface science perspectives on eco-friendly corrosion inhibitors

Design and synthesis of new sustainable corrosion inhibitors inspired by houttuynin with high inhibition efficacies at a low concentration

Comparative corrosion inhibition of expired favipiravir and hydroxychloroquine sulfate: An In Silico and In Vitro study

In a recent study (Kokalj, 2026), a model was developed to map multilayer surface coverage to inhibition efficiency ( η ). In that model, the corrosion protectiveness of adsorbed molecular layers beyond the first was postulated to follow a Langmuir-like dependence on the number of layers. In the present work, this model is generalized by leveraging an experimental observation that the polarization resistance of Langmuir–Blodgett monolayers increases linearly with the number of deposited monolayers beyond the first. It is shown that the previously developed model is a special case of the more general formulation presented here. Both models predict a characteristic hallmark shape in the c / η versus c plot—where c is the inhibitor concentration—featuring a bent, arching profile above the c / η = c line at low concentrations, followed by a linear regime at higher concentrations. The generalized model, however, provides further insight, indicating that the extent of this curvature increases when the contribution of the subsequent layers to inhibition efficiency is strong, or when the first adsorbed layer contributes weakly, a behavior that is consistently reproduced when the model is applied to experimental inhibition efficiency data from the literature. Yet under many conditions, the curvature remains too subtle to allow unambiguous identification of multilayer adsorption based on c / η versus c plots alone. • A generalized multilayer inhibition-efficiency model based on corrosion resistance is developed. • The previously postulated model is shown to be a special case of the new formulation. • Multilayer effects produce arching c / η vs. c curve below condensation concentration. • Multilayer effects are stronger when the first-adsorbed layer contributes less to inhibition. • A typically weak c / η vs. c curvature helps explain why multilayer effects are often missed.

Mechanistic insights into the eco-friendly corrosion inhibition of carbon steel in 1 M HCl by Origanum majorana extract: Electrochemical and theoretical study

Ultraviolet catalysis assisted chemical mechanical polishing of cobalt: Mechanism of corrosion inhibition and atomic-level planarization

Integrating corrosion inhibition studies with heavy metal ion detection using cholesteryl hemisuccinate

Enhanced corrosion inhibition of a novel bis-Schiff base rust preventive oil for transformer-associated copper and 10# steel in salt spray environment