Corrosion Inhibition Strategies for Metal Protection

Metal corrosion poses pervasive challenges across infrastructure, energy and transportation sectors, driving intensive research into methods that can impede or halt metal degradation. Corrosion inhibitors—organic or inorganic compounds added in small concentrations—function by adsorbing onto metal surfaces, forming protective films that block aggressive species such as chloride or sulphate ions. Contemporary approaches extend beyond traditional inhibitors to encompass synergistic combinations, environmentally benign “green” substances and coatings that incorporate self-healing functionalities. Advances in surface analytics, including atomic force microscopy and X-ray photoelectron spectroscopy, have elucidated adsorption mechanisms at the molecular level. Meanwhile, electrochemical techniques such as impedance spectroscopy and potentiodynamic polarisation provide quantitative measures of inhibitor performance. Computational tools, from density functional theory to machine-learning models, now guide the rational design of novel inhibitors by predicting adsorption energies, identifying active functional groups and accelerating discovery through high-throughput virtual screening. Together, these developments are forging robust, cost-effective protection strategies for steels, alloys and other technologically critical metals in diverse environments.

Research from Nature Portfolio

Recent studies have demonstrated that combining small organic molecules can produce synergistic corrosion inhibition effects on mild steel in acidic environments. Surface analyses by scanning electron microscopy and electrochemical impedance spectroscopy reveal that co-adsorbed mixtures form denser, more uniform barrier films than single compounds, while quantum chemical calculations clarify the key orbital interactions responsible for enhanced adsorption. Another body of work has explored D-glucose-derived polycyclic tetraones as mixed-type inhibitors for steel in hydrochloric acid. Substituent effects on electronic distribution were correlated with inhibition efficiency, and Monte Carlo simulations mapped the preferred adsorption configurations on Fe surfaces. In addition, investigations into azelaic acid dihydrazide have identified it as an eco-friendly, mixed-type inhibitor achieving over 90% protection at optimal concentrations. Langmuir adsorption behaviour and temperature dependencies were characterised experimentally, and surface imaging confirmed formation of stable inhibitor films that resist acid attack.

Corrosion Inhibition Strategies for Metal Protection publication trend

The graph below shows the total number of articles in corrosion inhibition strategies for metal protection across all publications each year (not limited to Nature Index journals).

Technical terms

Corrosion inhibitor: A substance that slows down or prevents the chemical or electrochemical degradation of a metal by forming a protective layer on its surface.

Physisorption: A reversible adsorption process involving weak van der Waals forces between inhibitor molecules and the metal surface.

Chemisorption: An adsorption mechanism characterised by the formation of chemical bonds between inhibitor molecules and metal atoms, yielding stronger, more specific surface attachment.

Langmuir adsorption isotherm: A model describing adsorption on a uniform surface with a finite number of equivalent sites, assuming no interaction between adsorbed species.

Mixed-type inhibitor: An inhibitor that concurrently suppresses both anodic metal dissolution and cathodic reduction reactions in a corrosion cell.

Electrochemical impedance spectroscopy (EIS): A technique measuring the impedance of a metal–electrolyte interface over a range of frequencies to assess film integrity and inhibition kinetics.

References

1. Impact of inhibition mechanisms, automation, and computational models on the discovery of organic corrosion inhibitors. Progress in Materials Science (2025).
2. Synergistic effect of tartaric acid with 2,6-diaminopyridine on the corrosion inhibition of mild steel in 0.5 M HCl. Scientific Reports (2016).
3. Plant Extracts as Green Corrosion Inhibitors for Different Metal Surfaces and Corrosive Media: A Review. Processes (2020).
4. Green Corrosion Inhibitors from Natural Sources and Biomass Wastes. Molecules (2018).
5. Corrosion inhibitors: physisorbed or chemisorbed?. Corrosion Science (2022).
6. Corrosion inhibition of mild steel in 1M HCl by D-glucose derivatives of dihydropyrido [2,3-d:6,5-d′] dipyrimidine-2, 4, 6, 8(1H,3H, 5H,7H)-tetraone. Scientific Reports (2017).