Corrosion protection is the main reason to have a finish or coating on steel products because they will corrode when exposed to the atmosphere. Other benefits include improving the appearance of the fastener and reducing friction. A finish is chosen based on corrosion protection, application conditions such as temperature, the presence of salt water, chemicals, or humidity, and the desired finish appearance. In a matter of minutes, a threaded rod can go from plain to coated by immersion in a specially-engineered chemical solution. Finishes are commonly categorized based on the industry and application. For example, contractors in the construction industry tend to prefer hot-dip galvanized anchor bolts because the iron in the steel metallurgically reacts with the molten zinc to form a tightly-bonded alloy coating that protects the bolt from damage and corrosion.
Before most finishes are applied, the threaded piece must first be cleaned to remove unwanted contaminants and oils that may have accumulated during the manufacturing process. Steel products are typically cleaned by submersion into a bath to remove unwanted contaminants. Once this is complete, the protective coating, or finish, is applied to protect the metal from the atmosphere.
There are several finishes to choose from; the finishes listed below are the most commonly used finishes throughout the threaded rod industry. Don’t forget – application is key in determining which finish would work best for your project!
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