Selection
of Aluminium:
Grades of aluminium extrusion and
sheet suitable for architectural applications are defined.
Significant
Surfaces:
The customer needs to define
critical surfaces by means of drawings or samples, so that jigging can be
optimised to minimise jig marks.
Surface
Texture:
The effect of the original surface
on the final anodised surface is outlined.
Colour:
The potential for colour variation
is outlined.
Visual
Inspection after Anodising:
This
is defined to take place at not less than two metres. Notes are also given
concerning viewing angles and presence of metallurgical features in the metal
itself that can affect appearance.
Thickness
of Anodic Coating:
Anodic film thickness is defined
and related to the corrosion zones in NZS3604 (Timber Framed Buildings). This
gives a map of New Zealand and the required film thickness for specific areas
and micro climates.
Temporary
Protection of Anodised Aluminium:
Recommendations are given in Appendix
F of the Specification.
Maintenance of Anodised Aluminium:
Recommendations are given in Appendix E of the
Specification.
Anodising
Zones:
There are 5
zones (sea spray plus four others).
Sea spray that requires at least 25 microns;
Zone 1 that is Coastal, but not Sea
spray. This requires at
least 20 microns.
Zone 2 that is Inland Coastal and Zone 3 that is Inland with Plentiful
Rainfall, both require at least 12 microns.
Zone 4 is the Geothermal Zone, here 25 microns is
required.
Click here to go to the
Anodising Corrosion Zones map.
Summary
Overall,
the WANZ Specification has been produced to give specifiers, manufacturers and
fabricators clear guidelines.
This
enables anodised joinery to be selected, produced and installed in the best
possible way.
