The American Galvanizers Association (AGA), headquartered in Centennial, Colo., is a not-for-profit trade association dedicated to serving the needs of specifiers, architects, engineers, contractors, fabricators, and after-fabrication hot-dip galvanizers throughout North America.Since 1933, the AGA has provided information on the most innovative applications and state-of-the
American Galvanizers Association Status of Research on Slip Coefficient of Bolted Galvanized Steel RCSC 2009 Specification for Structural Joints Using HighStrength Bolts Class A = 0.33 (uncoated clean mill scale steel; surfaces with Class A coatings on blast cleaned steel) American Galvanizing - Valmont CoatingsAt Valmont Coatings, American Galvanizing Facility we take personal interest in every order. Our team welcomes the opportunity to work with you on your most challenging projects. From design assistance and special handling to job site delivery, our focus is on making sure your product or project is a winner.
Corrosion resistance. Galvanized coatings protect steel in three ways:The zinc weathers at a very slow rate giving a long and predictable life. The coating corrodes preferentially to provide sacrificial protection to small areas of steel exposed through drilling, cutting or accidental damage. Coatings - IZASAZinc coatings protect steel by providing a physical barrier as well as cathodic protection for the underlying steel. Steel can be coated with zinc 24/7/365 and galvanizers are in virtually all geographic areas of the world. This process eliminates the possibility of hydrogen embrittlement of high strength fasteners. Coating thickness is
through the Lectro-Life priming system to further combat rust and corrosion" according to Reading. The American Galvanizing Association states that "coatings such as mechanical plating and metallizing, which rely on mechanical methods for zinc depos-ition, contain spaces between particles of zinc, resulting in a lower coating density." Design Considerations for Galvanizing:Fasteners, Bolts Zinc-plated fasteners have a thin zinc coating, up to only 1 mil (25 microns). Cathodic protection - unlike other barrier coatings, such as paint, zinc is a sacrificial metal and preferentially corrodes to protect the underlying steel. Design considerations courtesy of American Galvanizers Association.
Thermal sprayed Zn-based coatings are mainly zinc and aluminum coatings or their alloys (mostly Zn and Zn-15%Al coatings). Thermal spraying is particularly suited to protecting articles which are too large to be dipped in the galvanizing bath. GALVANIZINGis where the hot dip galvanizing enters the context. By dipping the construction in molten zinc it get both externally and internal corrosion protection with very good resistance. Hot dip galvanizing is used for a wide range of products, from small fasteners to large beams, bridge segments, roof trusses, lamp posts, road blocks and facade elements.
For this reason, metal coatings applied prior to assembly, are generally preferred. Zinc is the most commonly used metal for protecting fasteners. It is applied either by the electroplating process or by hot dip galvanizing. For extended corrosion free life, zinc coating / HOT-DIP BIOGRAPHY SUMMARY GALVANIZED STEEL Fasteners, and D01 on Paint and Related Coatings. He has provided technical support for many specifiers and engineers who have technical questions writes a regular feature in the American Galvanizers Association Magazine on problems related to hot dip galvanizing. He has authored and presents a seminar series on
Feb 01, 1998 · As a general rule, the thicker the zinc coating, the longer the corrosion protection afforded. As the graph shows, hot-dip galvanized fasteners will last longer than either mechanically galvanized or electroplated products. In addition to providing longer corrosion protection, hot-dip galvanized coatings have a more uniform and slightly thicker Q&A:Life Expectancy of Galvanized Fasteners JLC OnlineFeb 01, 1998 · As a general rule, the thicker the zinc coating, the longer the corrosion protection afforded. As the graph shows, hot-dip galvanized fasteners will last longer than either mechanically galvanized or electroplated products. In addition to providing longer corrosion protection, hot-dip galvanized coatings have a more uniform and slightly thicker zinc layer on
Sep 06, 2012 · Fasteners are lowered into a vat of molten zinc at a temperature of about 850°F. The American Galvanizers Association claims that a damaged area of the coating up to ¼ in. will continue to receive protection from the surrounding zinc. Because the zinc coating is sacrificial, however, it eventually will corrode. Still, the cost of HDG fasteners (and any connectors used Zinc Plating Effects on Fasteners Bayou City Bolt & SupplyStandards organizations closely dictate the manufacture and performance for plated fasteners through doctrine, such as ASTM F1941 10, Standard Specification for Electrodeposited Coatings on Threaded Fasteners (Unified Inch Screw Threads). The standard focuses on zinc, cadmium and zinc alloy platings for North American fasteners. Specifically:
2American Galvanizers Association Coating Characteristics and performance The batch hot-dip galvanized coating consists of a series of zinc-iron alloy layers with a surface layer of pure zinc (Figure 4). The unique intermetallic layers are tightly bonded (3,600 psi) to and harder than the base steel, offering excellent abrasion resistance.