According to ASTM A 653-03 , a G90 coating designation means the weight of zinc on both sides of a steel sheet is 0.90 oz/ft2 A single measurement of coating thickness is not sufficient to evaluate whether the galvanized coating adheres to the specification (ASTM A123, A153, A767) requirements. Each specification calls out sampling size and averaging techniques to develop a true picture of compliance. 4.1 General— Most thickness gauges are not applicable to all combinations of coating-substrate thicknesses and materials. The difference of the microns is losing me money, so I need to calculate how much grams I am losing because of the difference of the microns. The Filmetrics F10-ARc was designed especially for ophthalmic applications and comes standard with a number of proprietary features for characterizing AR coatings. What should a coating thickness gauge read on a G90 galvanized coating? Ouch... You have clicked a page that seems to be very popular.

Automated coating thickness measurement in production facilities Hardness of Complex Coating Systems for Optical Components Determining the Surface Hardness of Paint Coatings – Pencil Testing vs. Instrumented Indentation Testing
Magnetic induction instruments measure the thickness of nonferromagnetic metal coatings such as chrome, copper, zinc, paint and powder coating over steel and iron. Therefore measurement and control of the AR coating and its color has become increasingly important. Vinod Kumar Design engineer - India Elcometer offers a wide range of coating thickness gauges to measure dry film thickness..

PLUS: Zinc thickness variations usually don’t affect paint thickness results if the zinc is >3 mils How to calculate/measure the thickness of zinc coatings. The zinc micron thickness is higher than the standard coating. The QNix® 8500’s combined measurement mode makes it possible to measure the layer thickness of the hot-dip galvanising and the epoxy-based coating on the steel substrate in a single measurement process. Coating Thickness Gauges . A coating thickness gauge is an essential quality assurance tool when anodizing, galvanizing and applying zinc coating to metallic surfaces. Re thickness (for uniform coatings or for average value): Measure the diameter by micrometer, strip the zinc using inhibited hydrochloric acid, then remeasure. SURFACE COATINGS Electroplated coatings Example of coding: A3L means zinc-plating (A in table 1) with a minimum layer thickness of 8 µm (3 in table 2) and yellow-chromatized with a glossy degree of gloss (L in table 3). Micrometers (um) Millimeters (mm) Inches Mils (Thousandths) “Tenths” (Ten-Thousandths) Millionths (Microinch) Comments; 0.1: 0.0001: 0.000004: 0.004: 0.04 Silicone which is used to deoxidise steel will affect coating thickness too: the more silicone present, the more reactive the zinc and the greater the thickness of the galvanized coating. Metallic Coating Thickness Measurement perform standards: UL 1703-2015, ASTM B499-2009, ISO 2178-1995, The method for determining the thickness of a zinc or cadmium coating. The formation of the zinc-iron alloy coating depends principally on the chemical composition of the steel that is galvanized. Understanding the equipment that is available for film thickness measurement and how to use it is useful to every coating operation. For example, I need 85 micron for steel whose weight is 10 ton and I am getting 100 microns for the same weight after checking by Elcometer. In addition to steel thickness, the composition of the steel alloy itself is also relevant. Coating thickness is an important variable that plays a role in product quality, process control and cost control.

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