Laser process etches anti-fouling hull surface

Paints and varnishes are used as ship coatings to stop algae or drag-enhancing barnacles sticking to hulls, but these can be harmful to the environment.

Now, European scientists are developing a 1kW, ‘dot matrix’ ultrafast laser system that can carve flow-optimised metal or plastic surfaces.

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‘Slippery’ steel provides both durability and anti-fouling

Etching tiny ‘spike’ structures onto sheet metal or plastic, the new laser system can reportedly create a rough surface at a microscopic level. This uneven topography can reduce drag or inhibit the growth of bacteria, algae or even barnacles.

The idea for this maritime application has been inspired by shark’s skin, which is covered in millions of microscopic denticles - or tiny protruding scales – that reduce drag to make it a highly efficient swimmer. Similarly, engraved metal or plastic surfaces can have 'anti-fouling' properties that prevent contaminants or microorganisms from adhering to them.