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  • Black oxide passes hydrogen-embrittlement test
    Protective coating has no adverse effects on fastener life. Notched square-bar specimens are black-oxide coated and tested to failure to determine susceptibility to hydrogen embrittlement. Fastener manufacturers routinely apply a protective finish to bolts and screws that prevents rust
  • Black Magic: The Science Behind the Magic
    The hot black finish developed is a true conversion coating, converting iron to the naturally occurring black iron oxide compound called magnetite (Fe304). This conversion coating has a tight, adherent, highly durable composition, which does not easily scratch and does not chip, flake or peel
  • Integral Coloring
    yellow to black. Anodizing in electrolytes consisting of aqueous solutions of sulfuric acid has long produced decorative coatings on aluminum. The anodic oxide formed during the anodizing process using Type II anodizing conditions is normally clear. However, the oxide can be colored by a variety
  • Magnetic Stripe
    What is a magnetic stripe? A magnetic stripe is the black or brown stripe that you see on your credit card, or maybe the back of your airline ticket or transit card. The stripe is made up of tiny magnetic particles in a resin. The particles are either applied directly to the card or made
  • High-tech metal flake
    ChormaLusion colors now offered by DuPont Automotive Finishes, Wilmington, Del., in its ChromaPremier paint line. The original dark green Hummer was painted by C &C Customs LLC, Bristol, Tenn., with a ChromaPremier black basecoat followed by the striking topcoat. The paint is said to be no different during
  • Spiral-Wound Rings
    treatment to retard rust. Cadmium plating and phosphate coating are other standard finishes readily available. Specials include black oxide and parkerized finishes. Zinc, chrome, copper, and gold plates are also available. Plating adds approximately 0.002 in. to the maximum ring thickness. Standard rings

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