University of Queensland researchers have developed a self-repairing coating that restricts annual corrosion to just 37 nanometers. Announced by the University of Queensland on September 17, the powder-like nano-container technology turns standard water-based paint into an active corrosion shield designed for bridges, infrastructure, and vehicles.
According to calculations by the Australasian Corrosion Association, corrosion carries an annual economic toll of roughly $90 billion across Australia across the defense, water and wastewater, infrastructure, and oil and gas sectors. Traditional anti-corrosion barriers inevitably degrade under environmental stress, requiring expensive and frequent reapplication.
University of Queensland Researchers Engineer Smart Powder Particles
A research team led by Dr Asep Nugraha at the University of Queensland has engineered a powder additive that mixes directly into water-based paint. Instead of serving as a static barrier, the composite material actively monitors its environment for microscopic failures.
“What we have created is a barrier that is constantly sensing if something is wrong so it can patch any scrapes and cracks itself, greatly extending the duration of protection.”
Dr Asep Nugraha, Researcher at the University of Queensland
The core innovation relies on microscopic nanocontainers. Each tiny particle is basically a nanocontainer that releases repair molecules only when the conditions demand it,
Dr Nugraha explained.
Electrochemical Testing Reveals Dramatic Corrosion Resistance
Published in the journal Small Science, electrochemical testing demonstrates that the self-healing polyurethane composite can restrict corrosion to just 37 nanometers per year. Existing high-performance protection products typically limit annual corrosion to about 0.025 millimeters.
The technology does not render structures immune to wear indefinitely. It is not a coating that will last forever, but coatings that contain our technology will have a greatly expanded lifetime, meaning far less maintenance and a much longer time between applications,
Dr Nugraha noted.
Potential Infrastructure Applications and Commercialization Timeline
Public assets such as bridges demand immense public expenditure for ongoing maintenance and repainting. Researchers point to landmark structures like Brisbane’s Story Bridge to illustrate the potential impact of long-duration protection.
“For structures like bridges, applying a rust-proof coating comes at a great effort and cost, often to the public. But imagine, for example, if you only had to put a single coat of paint on the Story Bridge that protected it for more than 100 years.”
Dr Asep Nugraha, Researcher at the University of Queensland
With laboratory testing complete, the research team is preparing for pilot-scale trials.
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