Surface Treatment

Our patented technology is used to roughen or apply a texture to components in order to prepare the surface for adhesive bonding, sealants and coatings.

Unlike current technologies, no masking is required and the procedure can be carried out in-situ.

In composite to metal bonding, grit/media blasting is commonly used to roughen the bonding area to improve the strength of the bond.

Typically, grit blasting is limited to and results in surface roughness around Ra 3.5μm in titanium and Ra 6.5μm in aluminium.

In comparison, our technology can readily produce a wider range of surface roughness in excess of Ra 10μm. This has been demonstrated to further improve the strength of the composite to metal adhesive bonds.

This chart shows the comparison of lap shear tests carried out in accordance to ASTM D5868-14: lap shear adhesion for FRP bonding.

The STAT system was used to texture an Aluminium alloy 6000 series sample that was then bonded to a carbon fibre reinforced polymer sample, which had a peel-ply textured surface. The graph is the culmination of over 140 individual tests.

As is shown, the performance of a STAT- textured sample is considerably better than the control where the metal was untextured but still with ply-ply and comparable to the grit blasted sample in performance terms, but gaining a much more consistent result.
Preparation of the STAT-produced sample also required no masking and produced almost zero waste in comparison to the grit blasted samples cutting out significant time and cost from the processing stage

“The development of parallel technologies like STAT, is vital to the continued growth of the composites industry”

Kevin Doherty, Managing Director, Codem Composites Ltd.