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Researchers at the Indian Institute of Technology (IIT) Guwahati have developed a corrosion-resistant epoxy coating designed to protect steel structures exposed to seawater and high-salinity environments.
Corrosion in marine conditions severely weakens steel used in offshore platforms, coastal bridges, port infrastructure and pipelines, shortening service life and creating safety and environmental risks. Conventional barrier coatings often develop microscopic defects over time, allowing moisture and salts to penetrate and attack the underlying metal.
To address this, the IIT Guwahati team created a nanocomposite by combining reduced graphene oxide (RGO), zinc oxide (ZnO) nanorods and the conducting polymer polyaniline (PANI), and dispersing this composite in an epoxy matrix. Laboratory tests show that the new coating forms a denser, more uniform barrier than standard epoxy, adheres more strongly to steel surfaces and slows the ingress of corrosive elements more effectively.
According to the researchers, these properties make the coating promising for marine infrastructure, offshore and shipbuilding applications, as well as coastal pipelines and other steel assets exposed to saltwater. The work, published in the journal Advanced Engineering Materials, is currently at the laboratory stage. The team plans further studies on long-term durability, real-world performance and life-cycle impacts before the technology can move toward commercial deployment.
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