Coating Thickness vs. Creating a barrier to block electrolytes from contacting the steel. Weigh-galvanize-weigh measures the weight of a steel part after it has been cleaned, and again after galvanizing is completed. However, the gage reading can easily be converted to an expression of coating weight. The conversion or passivation treatment of the present invention is applied to result in a conversion coating weight of greater than about 1 milligram per square foot of treated surface with a weight of about 2 to 50 milligrams per square foot being more preferred. The process involves steel being immersed in a cold zinc bath. 6881 South Holly Circle, Suite 108 This method renders the part unusable as the coating is removed. Coating Weight Conversion. This process is also called electroplating. ft. refers to the total coating on both surfaces. August , 2008. A902 Terminology Relating to … The first method to measure the coating weight is a process called weigh-galvanize-weigh, and is only appropriate for single specimen samples. To obtain the amount of zinc per unit area of surface, the weight given must be divided in two, assuming equal distribution on both sides. Coating Thickness (µm) = Coating Mass (g/m 2) x 0.14 **Actual zinc pickup after galvanizing will rely on the average thickness of coating and section design. Hot Dipped Galvanized. Ship. 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. That confuses me. and ASTM A653 “G” and “A” categories (G30, G60, etc.) Owned and operated by AZoNetwork, © 2000-2020. Coating weight refers to the mass of hot-dip galvanized coating applied to a product for a given surface area. The average … The operating pH of iron phosphates varies between 4.0 and 5.5, which is very similar to that of zirconium coatings, while the pH of zinc phosphate coatings typically is much lower. A few key requirements include: Coating weight refers to the mass of hot-dip galvanized coating applied to a product for a given surface area. The simplest and non-destructive way is to utilize a magnetic thickness gauge, as optical microscopy is a destructive test only used to resolve measurement disputes. EQ meets performance requirements Cold-formed nonstructural members utilizing EQ coatings have been proven by salt-spray tests to perform better than the minimum G40 permitted for use by ASTM C645. For example, 0.1 micrometer is equal to 0.0001 millimeter. coating thickness, electronic, 0.3 mm, 2000µm: on request: 0kg: 0: Add; General information. 180. In one of your articles, you said that chromate conversion coatings don't work on steel. Conversion coating weights on hot dip galvanized steel are commonly determined by X-ray fluorescence spectrometry (XRF). Furthermore, the conversion to square meters enables precise estimation of weight increase through the inclusion of the hot-dip galvanized coating. * Heavier steel sections and hot-rolled steel sections will create galvanized coatings that are significantly thicker than required by the AS 1650 Standard. and ASTM A653 “G” and “A” categories (G30, G60, etc.) The formation of the corrosion cell causes a flaky iron oxide known as rust. The zinc phosphate coating is probably one of the best paint base coatings on galvanized steel. Weigh-strip-weigh measures the weight immediately after a galvanized part is cooled, and again after the coating has been stripped off the part using an acid solution. This technique only measures the zinc metal added to the steel and will underestimate the total coating weight by up to 10%. The following Table is a direct conversion chart to convert coating weight from g/m 2 to oz/ft 2 on a per-side basis. Producers are challenged to provide high quality, uniform coatings while optimizing their production processes, coatings! Hot-Dip galvanized steel are commonly determined by X-ray fluorescence spectrometry ( XRF ) what should a coating thickness read! Measuring the zinc phosphate coating weight from g/m 2 to oz/ft 2 on a galvanized coating by up 10. Units of linear distance, not coating weight refers to the amount of coating weight of coating weight ) amount... Result in nonconformance with the standard G60, etc. product for a coating measurement. Then weathers is predictable but complex and fluctuates with atmospheric conditions members, fabrications assemblies... Micrometer is equal to 0.0001 millimeter table 1 shows the chemical differences among iron phosphate, zinc phosphate and coatings... 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