Die Cast Finishing
A variety of high quality surface finishes is another major advantage that zinc has over other materials. Listed below are the various finishes we can offer.
Electro-PlatingZinc die castings offer excellent plating characteristics. Electro-plating is generally a multi-layered coating consisting of one or two copper layers, one or two layers of nickel, and a final layer of chromium, brass, gold, or any other palatable metal. Chromium plating is the most popular decorative finish when corrosion and high abrasion resistance are required.
ChromatesChromating is a low-cost chemical treatment that provides additional corrosion protection against "white rust". This form of zinc corrosion is caused by prolonged exposure to damp conditions. Chromate finishes are produced by simple dip methods which deposit a thin chromate coating. Chromate coatings are often applied to instrument, military and automotive components where low cost resistance to moisture is required. These coatings normally have a bronze tone or metallic luster depending on the process used.
PhosphatesPhosphate coatings are primarily used to provide a good base for painting or powder coating.
Polishing and BrushingConventional high luster polishing or brush finishing techniques can produce appearances similar to chrome plating or stainless steel. When lacquered, these finishes are suitable for decorative, interior applications.
PaintingAll zinc alloys form an excellent base for paints. To aid paint adhesion, phosphate or chromate pretreatments are often utilized. Zinc alloys can also be electrostatically painted.
Powder CoatingsPowder coating involves electrostatic spraying of the zinc castings with an epoxy or polyester powder. The parts are then immediately oven cured for a hard durable finish. The result is an even, inexpensive, corrosion resistant plastic coating. Powder coatings are available in a wide range of colors.
E-CoatingsElectrocoating (E-Coat) is the process by which a metal object is subjected to a positive charge while submerged in a solution of deionized water and negatively charged paint ions. The charge differential causes the negative paint ions to bond to the positively charged metallic surface. The paint applied to the parts is an anodic acrylic water based paint. These parts are then oven cured to produce a hard durable finish. This finish is an even, corrosion resistant coating that resembles a powder coat finish and is available in different colors.
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A list of the zinc alloys that Connecticut Precision Castings currently utilizes.