Issue link: http://www.e-digitaleditions.com/i/206043
™ A Mechanical Rust Prevention System Perfect Coat Plus™ chains offer up to thirty times more protection from corrosive damage compared with conventional nickel plated products. These improved chains feature a mechanical rust prevention system which utilizes a zinc-alloy-iron film coating. The resulting film is extremely durable and will not chip, flake, peel or rust in many mildly corrosive applications. Salt Water Corrosion Test Roller chains submerged in and out of an aerated 5% salt water solution (equivalent to seawater). Carbon steel, nickel plated, Dip-Spin Zinc Chromate and Perfect Coat Plus™ chains are tested for 14 days. The Dip-Spin sample and Perfect Coat Plus™ chain show significantly less rust after two weeks of testing. Note that rust development on the Dip-Spin sample (Top in photo) begins where the bushing is press fitted into the link plate. When the chain was assembled, the coating chipped, peeled or flaked, causing a corrosive attack at this area. Eventually this rust will spread underneath the plated surface reducing chain life. Rust development at the press fit area. Traditional Dip-Spin Nickel Plated Zinc-Chrome Coating Carbon Steel Chain Carbon Steel Perfect Coat Plus™ Nickel Plated Chain After 2 weeks both the carbon steel and nickel plated chains exhibit substantial rust. The chain joints have frozen stiff making the chain difficult to flex. Perfect Coat Plus™ is a significantly more durable coating which does not chip, flake or peel. Virtually no rust developed on this sample.