Produces a passive corrosion-resistant finish.Īcid dip produces a hard oxide surface. 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. while the carbonate layer has protective properties, zinc is a reactive metal and gradually wears away through corrosion over time. However, this element does not rust like most other metals. This is why alloys, which are made from two or more different metals, are resistant to rusting. While all metals corrode, they each corrode at different rates. Low cost.Ĭhemically produced coating superior to regular phosphate and oil. Like all metals, zinc rusts when exposed to air and moisture. Many outdoor structures, like this bridge, are made from COR-TEN steel to reduce the effects of rust. Zinc or manganese phosphate used with a rust-inhibiting oil dip. 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. Common fastener platings and finishes and their characteristics. You'll find all of the popular platings and finishes at Fastener Mart. 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. Zinc is more corrosion resistant than steel in most natural atmospheres, the exceptions being ventilated indoor atmospheres where the corrosion of both. 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.
Will zinc rust outside series#
Fastener Tech Data | Understanding Series Introduction
0 kommentar(er)
