Applications and Mechanism of Nanotechnology in Metal for Corrosion Protection

Abstract

Utilizing the unique properties of nano-scale materials, nanotechnology has emerged as an innovative approach for combating metal corrosion. Based on a meta-analysis of current literature, this article reviews the developmental trajectory of nanotechnology in this field and categorizes its anti-corrosion mechanisms into three primary types: barrier enhancement, active inhibition, and destruction of occurrence conditions. Among these, barrier enhancement relies on physical mechanisms such as the tortuous path effect and pore blocking to passively impede the penetration of corrosive agents and reduce their diffusion rates. In contrast, active inhibition employs chemical strategies, often through stimuli-responsive nanocontainers that release corrosion inhibitors upon damage—enabling self-healing functionality either autonomously or through external control. The most proactive mechanism aims to eliminate the fundamental conditions required for corrosion, with representative examples including superhydrophobic surfaces that repel electrolytes and surface modifications that enhance chemical inertness. Each strategy is evaluated in terms of performance, durability, and practicality, while future prospects highlight the need for multi-functional integrated systems, smarter responsive coatings, improved economic viability, and environmentally sustainable designs.