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Surface treatments and coatings are extensively used in the manufacture of white goods and domestic appliances.
- Anodizing and conversion coatings to protect and aid paint adhesion for aluminum components
- Chromium plating for the decorative trim
- Electroless nickel is the perfect choice for parts which provide electrical conductivity
- Phosphate coatings to prepare the steel base metals for subsequent organic finishes
- Zinc based electroplated finishes to provide sacrificial corrosion protection for fasteners
Before domestic appliances receive their final painted finish, they need the correct preparation and base coating to ensure maximum adhesion of the organic coating. The Oxidite anodizing range includes degreasing, etches and sealers for all aluminum and its alloys.
Iridite NCP is the chromium free passivate which provides both high adhesion values for subsequent organic coatings as well as excellent corrosion resistance in its own right.
In areas of high use, for example fascia surrounds, handles and buttons, MacDermid fashion finish portfolio provides the perfect solution to enhancing component durability and aesthetics.
Designers have the option to choose from mirror bright chromium to dark satin, or our contemporary full hue colors sold as yellow, red and blue. The chromium coated finishes meet ISO 4525 for service conditions 1 and 2.
Fashion Finish Range includes:
- Bright trivalent chromium
- Dark trivalent chromium
- UV-cured electrophoretic lacquer
Phosphate coatings are extensively used to improve the adhesion of organic coatings to ferrous metals. The CanPhos and Keykote phosphating improves this adhesion in either spray or immersion applications.
To meet RoHS, WEEE and EOLV directives, our processes include Qualicoat and GSB approved chromium-free systems. For multi-metal use we have cleaner phosphate systems which can be teamed with high-performance dry in place final seals to provide reliable, cost-effective pre-treatment for painting.
Our latest technology BlueKote 2000 answers industry concerns on disposal of phosphates. BlueKote 2000 is both phosphate and heavy metal-free. BlueKote 2000 increases the bonding between metal and paint as well as improving the corrosion resistance.
These deposits may contain up to 13% Phosphorus by weight and unlike normal electroplating processes, they are produced without any externally applied electric current.
The coatings are applied to a wide variety of substrates with both simple and complex geometries. Electroless nickel improves characteristics such as appearance, electrical conductivity, corrosion and wear resistance. For these applications NiKlad 849 is particularly recommended.
Zinc, coupled with a trivalent chromium passivate, provides an exceptionally corrosion resistant and electrically conductive finish at an economical cost. The protection is largely the result of the zinc corroding preferentially to the steel, therefore extending component life.
MacDermid's range of TriPass ELV trivalent passivates are all hexavalent chromium-free. Additionally the new TriPass ELV 7000 range include hexavalent chromium and cobalt-free systems.
Typically in these applications, zinc is deposited as a 'blue-brite chrome' type finish with a neutral salt spray resistance of 72 hours to white and 240 hours to red rust. To meet this requirement MacDermid recommend the ZinKlad 96 finish.
The zinc plated deposit can also be passivated to produce a black finish where required.
Knobs and switches