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Composite Material Protects Against Corrosion from Severe Weather, High Pressures
06/27/2014

Researchers at the Leibniz Institute for New Materials in Germany have developed a composite material for preventing metal corrosion from severe weather, aggressive gases, heavy wear or high pressures.

“This patented composite exhibits its action by spray application,” Carsten Becker-Willinger, head of the Nanomers Program Division at the INM, said. “The key is the structuring of this layer: the protective particles arrange themselves like roof tiles. As in a wall, several layers of particles are placed on top of each other in an offset arrangement; the result is a self-organized, highly structured barrier.”

Measuring only a few micometers thick, the protective layer protects against corrosion caused by aggressive aqueous solutions, including salt solutions such as salt spray on roads and seawater, and aqueous acids such as acid rain. The material also acts as an effective barrier against gases and electrolyes, even under extreme pressure.

According to the researchers, the composite passed the falling ball test with a steel hemispherical ball weighing 1.5 Kg from a height of one meter without chipping or breaking, instead exhibiting only slight deformation. It can be applied to steels, metal alloys and metals such as aluminum, magnesium and copper by spraying or other commonly used wet chemistry processes, and cures at 150-200 degrees Celsius.

The composite contains a solvent, a binder and nanoscale and platelet-like particles; it does not contain chromium VI or other heavy metals.

 

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