Surface Finishing

Two commonly used surface finishes for aluminium offered by NALCO are powder coating and acid etch anodising.

Powder Coating

Powder coating is by far the dominant surface finish used in the building industry today. Powder coated Aluminium will give your project a durable, resilient colour finish. As the application process does not rely on the use of solvents and other chemicals, it is safe for the work and the natural environment. Powder coating is available in a wide range of colours with commercially available surface integrity warranties from 10 to 20 years.

For external use only to determine which formulations best suite your project please refer to the NZ3604:2011 Corrosion Wind Zone map and match with the Interpon D Warranty Matrix.

Anodising Acid Etch

The anodising process involves immersing the metal in a sulphuric acid bath and then passing an electrical current through the metal. This creates an etching process. Colour is added to the bath, and the etching process seals the colour as a film onto the metal. This film then provides a hard wearing surface. The film’s thickness is an important determinant of how much protection anodising gives. Film thicknesses available are 12, 20 and 25 microns. Anodising offers a number of colours that include black, bronze and silver, other colours are available.

Acid etch anodising features a significantly more consistent surface topography compared to caustic etch anodising. Surface roughness tests show acid etch anodising produces a more consistent surface roughness. Acid etching is less aggressive on the aluminium surface and exhibits substantially less grain boundary attack compared to caustic etching.

View our Anodising Brochure to read more. 

Feel free to contact us with your surface finishing needs.