Bolts, nuts, and washers shall be galvanized according to ASTM F 2329. Refractory Metals: An A to Z of Applications, Understanding the Importance of Gel Permeation Chromatography (GPC) in Commercially Available Industrial Polymer Analysis, InProcess-LSP: Providers of Groundbreaking PAT for Nanoparticle Characterization. The present invention relates to a composition and process for metal finishing involving the formation of zinc phosphate coatings of desired morphology on a ferrous surface. coating thickness, magnetic, 0.5 mm, 200µm: on request: 0kg: 0: Add; EMEAMETAGC02 : GAUGE, galva. The surface area per ton can also be estimated using the following formula: Surface Area per ton = 255/Section Area in mm. and ASTM A653 “G” and “A” categories (G30, G60, etc.) More info. A magnetic thickness gauge measures only one side. BS 729:1971 (1986) defines the minimum coating weight that must be achieved for particular gauges of substrate – the larger the gauge the greater the weight of coasting required. Each of these thicknesses, representing the same weight per unit area of zinc, would be expected to provide equivalent service life; i.e. Also, when does one choose chromating vs phosphating for galvanized steel? For example, 0.1 micrometer is equal to 0.0001 millimeter. In one of your articles, you said that chromate conversion coatings don't work on steel. Coating weight refers to the mass of hot-dip galvanized coating applied to a product for a given surface area. CEO of Bcomp, Christian Fischer, talks to AZoM about an important involvement with Formula One's McLaren. Conversion Coating. A90/A90M Test Method for Weight [Mass] of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings. The specifications include tables providing specific requirements for thickness or weight per surface area based upon the steel part type and the measured steel thickness. Auto Body Panels Appliances HVAC Agricultural Equipment Transportation HOT DIP GALVANIZED STEEL. There are two methods for measuring the zinc coating thickness of hot-dip galvanized steel; a magnetic thickness gauge and optical microscopy. A high-quality conversion coating is essential for the durability of painted metal goods. Note 1: The weight of coating in oz. vol. and ASTM A653 “G” and “A” categories (G30, G60, etc.) Conversion coatings increase the overall surface area and promote adhesion of the subsequently applied organic film. Furthermore, the conversion to square meters enables precise estimation of weight increase through the inclusion of the hot-dip galvanized coating. 6881 South Holly Circle, Suite 108 For example, 0.1 micrometer is equal to 0.0001 millimeter. Do you have a review, update or anything you would like to add to this article? Centennial, Colorado 80112, Phone: 720.554.0900 Owned and operated by AZoNetwork, © 2000-2020. Steel producers are challenged to provide high quality, uniform coatings while optimizing their production processes. The applied zinc phosphate coating weight should be 150 to 300 mg./sq. Coating Weight [Mass] Designation Systems Each coated steel sheet product has its own coating weight designation system, which is defined in the appropriate ASTM standard. Zinc entrapment, poor drainage, and enormous horizontal surfaces will lead to higher zinc pickup. However, more reactive steels will follow a steeper curve approaching a linear relationship thereby developing much thicker coatings upon dipping. Deposition weight (coating weight)—the amount of conversion coating or other material deposited by a metal treatment process. 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