Materials & Finishes 13 9 STEP POWDER COATING PROCESS
Lumascape ’ s corrosion resistant , marine grade aluminum luminaires are firstly acid etched to remove surface contaminants to ensure maximum coating adhesion . The etched luminaires then undergo a chromate conversion process to alter the surface structure of the aluminum and provide a keyed surface to further enhance the powder coating adhesion . Most of Lumascape ’ s range of cast aluminum luminaires are given an epoxy undercoat which is a sealing waterproof layer providing high corrosion resistance .
Lumascape ’ s powder coat is an architectural grade formula , selected specifically for its durability in harsh , coastal environments . 1 . Castings are inspected and mechanically dressed to remove any surface inclusions .
2 . Vibratory finish to round edges for better paint coverage at the corners and to remove potential corrosion “ lead ins ”. 3 . Acid etching removes dirt , dust and oil while providing additional surface keying . 4 . Rinse using dual tank de-ionised water to ensure all etch chemical is removed . 5 . Pre-treatment of the metal using a chrome-free conversion coating provides additional corrosion resistance and powder coat adhesion . 6 . Rinse using de-ionised water . 7 . Controlled oven dry ensures proper retention of the conversion coating and ensures parts are fully dry prior to application of powder .
8 . Epoxy undercoat , approx . 40 microns ( 1.5 mil ) thick with controlled cure to ensure good top coat bond . Epoxy provides an excellent , non-hygroscopic barrier .
9 . Polyester top coat , approx . 40 microns ( 1.5 mil ) thick to provide good UV protection .
The combination provides approx . 80 microns ( 3 mil ) of paint thickness overall . Parts are not handled at any time during the finishing process . All handling equipment is 316 Stainless Steel to avoid any possible contamination .
COPPER ALLOY
Copper alloy , or ' brass ', is a material used in the manufacture of several Lumascape luminaires .
Like copper , brass has great thermal performance but is structurally stronger . Lumascape prefers the use of brass over bronze due to its superior thermal conductivity .
Lumascape luminaires made from brass are also highly corrosion resistant , making them suitable for use in most outdoor applications .