Laser-based coating method developed for aluminium surfaces

AHC Oberflächentechnik in Germany has developed a novel laser-based method for oxidising aluminium surfaces without using chemicals. The Lasox-Coat treatment process can coat components selectively using a laser to protect them against wear and corrosion. A pilot plant is located in the French subsidiary Faulquemont; the process will enter serial production soon.

The laser heats the workpiece under oxygen to form an oxygen plasma. The oxygen plasma – which consists of ionised atoms – along with molten aluminium react to form aluminium oxide, which coats the treated surface.

The thickness of this corundum layer is typically around 6 to 10µm, while the re-molten area is about 100µm thick. The hardness of the aluminium oxide is approximately 2,000 HV. The hardness of the re-molten zone depends on the alloy used – with Si-containing alloys (Si>8 per cent) the hardness can increase by 50 per cent relative to the original alloy.

Twitter icon
Google icon icon
Digg icon
LinkedIn icon
Reddit icon
e-mail icon

Latest issue


Matthew Dale explores some of the latest technology for manipulating and measuring the beam, including a multi-spot optical module for laser brazing and a contactless beam analysis device


Moving to very high power lasers for welding metals, like aluminium in car production, has some big benefits, as Greg Blackman finds out

Analysis and opinion