![]() Can be color dipped after anodizing for preferred finish.īe sure to visit our Fastener Tech Data section for even more information. Avoid direct contact of your galvanized steel product with. Produces a passive corrosion-resistant finish.Īcid dip produces a hard oxide surface. Outside the range of pH 6-12 the galvanized coating can suffer greater corrosion than normal. Parts are dipped in nitric acid which removes iron particles and brightens the finish. ![]() Size must be adjusted to allow for thickness of coat. Hard lustrous finish adds wear resistance and is very expensive. ![]() Hard stable finish, relatively expensive and sometimes hard to apply. Olive drab, green, black, red, blue, bronzeĪpplied on top of zinc or cadmium plating as a die for color and additional corrosion protection. Low cost.Ĭhemically produced coating superior to regular phosphate and oil. This stops oxygen and water reaching the metal underneath but the zinc also acts as a. The iron or steel object is coated in a thin layer of zinc. Zinc or manganese phosphate used with a rust-inhibiting oil dip. Galvanising is a method of rust prevention. Relatively high cost and toxic to the environment.Ī secondary dipping process after plating increasing corrosion resistance, adding color or brilliance.Ī chemical discoloration which does not add to part thickness. Superior rust-resisting qualities used in marine and aviation applications. Good rust-resisting qualities, appearance and low cost. Typically, brass screws can be more aesthetically pleasing. Common fastener platings and finishes and their characteristics. The anti-corrosive and water resistant nature of these screws means they are ideal for exterior use. After magnesium and zinc, aluminium is normally. You'll find all of the popular platings and finishes at Fastener Mart. Avoiding galvanic corrosion Where there is contact with a more noble metal, such as copper and carbon steel. Refer to the chart below for other options. Chromium (chrome), although expensive, is used when a bright hard finish is desired especially when the fastener is visible. Hot dip galvanized is very resistant to corrosion, but its finish is somewhat irregular and, consequently, unpleasing. Zinc is the most common because of its pleasing appearance, low cost and good rust resistance. Platings and finishes affect not only how a fastener looks, but also how it will withstand corrosion-deterioration of the metal-caused by exposure to the weather or chemicals. Fastener Tech Data | Understanding Series Introduction
0 Comments
Leave a Reply. |