zinc coating thickness standard

Elcometer offers a wide range of coating thickness gauges to measure dry film thickness.. Coating and Dimensional Requirements 8.1 Coating Thickness—The zinc coating thickness shall meet the requirements of Table 2. 2. B487 Test Method for Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of Cross Section. 8. 3.2.3 dross inclusions, n—the iron/zinc intermetallics Formal quality systems, such as those described in ISO 9001, require coating thickness gauges to be properly controlled, logged and calibrated. We have written some guidance for zinc plating thickness. One of the most common zinc coatings is Class G90, which has 0.9 oz/ft2of sheet (total both sides) or about 0.80 mils (20 µm) thickness per side. Related Products Tests shall be performed to determine the minimum coating weight or minimum coating thickness, finish and appearance, embrittlement, adherence, average weight/mass of coating, and average thickness of coating. In the case of orders in SI units, all testing and inspection shall be done using the metric equivalent of the test or inspection method as appropriate. Visit Copyright Clearance Center, Historical Version(s) - view previous versions of standard, More A05.13 Standards The governing specifications for hot-dip galvanizing; ASTM A123, A153, and A767 as well as CSA specification G 164, and ISO 1461 contain minimum coating thickness Zinc Application Process Batch hot-dip galvanizing, also known as general galvanizing, produces a zinc coating by completely This is an important advantage of the galvanizing process – a standard minimum coating thickness is applied automatically regardless of the operator. Zinc Plating is commonly used in a variety of industries, including industrial and defense. 3.2 Definitions of Terms Specific to This Standard: 3.2.1 average coating thickness, n—the average of the specimen coating thickness values for the samples in an inspection lot. The corrosion resistance provided by the zinc coating is in direct proportion to the coating's thickness. COATING REQUIREMENTS. The most widely used ASTM zinc-coated sheet standard is A653/A653M7, which covers hot-dip galvanized products. For example, I need 85 micron for steel whose weight is 10 ton and I am getting 100 microns for the same weight after … Zinc coating thickness alone can be misleading when evaluating zinc applied to steel using diferent processes, according to the AGA. A47/A47M Specification for Ferritic Malleable Iron Castings. In addition, it addresses sampling and test methods to assure that the zinc coating is being furnished properly. … Fine-grain is an excellent pretreatment for steel prior to painting. Part supplied to this specification must have a minimum coating thickness of 5 micrometers and be capable of passing a 48 h salt spray test. Within the text of this specification and where appropriate, SI units are shown in brackets. The zinc micron thickness is higher than the standard coating. The documents listed below are referenced within the subject standard but are not provided as part of the standard. When it comes to the specification of hot dip galvanizing, most contractors know that to be standards compliant, 7mm steel requires an average coating thickness of ‘85 microns’. Weight of wire required 1.2kg/m2/100µm. ASTM A123-17 revises and replaces ASTM A123/A123M-15. Part supplied to this specification must have a minimum coating thickness of 5 micrometers … Typical coating thicknesses are 50 microns (µm), this is the thickest zinc coating to go onto the fastener resulting in superior corrosion resistance. This specification is applicable to steel hardware items of Classes A, B, C, and D. The thickness or weight/mass of zinc coating shall conform to specified values for various classes of materials. 0.3 This standard was first published in 1968. Typical coatings are Z275 and AZ150. Coating Zinc Thickness * Service life is defined as the time to 5% rusting of the steel surface. 8.2 Dimension—The dimensional characteristics of the fas-teners shall be in accordance with the requirements of the What is the thickness of a galvanized coating? ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. Galvanized steel is produced by hot dipping steel into molten zinc … Inch-pound units and SI units are not necessarily exact equivalents. Therefore, the typical designation used to consistently evaluate the protection value of the zinc is coating weight. This Standard specifies requirements for steel grades, coating classes and surface finish, as Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard. Zinc coating thickness is connected with workpiece thickness, but is usually as follows: Thickness of the workpiece is greater than or equal to 6 mm, the average thickness is greater than 85 microns, 70 microns … So the growth per surface will be equal to the thickness per surface. Concentrations of lead, mercury, poly-brominated Biphenyls (PBB) and polybrominated diphenyl ethers (PBDE), in any as deposited homogenous material must be less than 1000 PPM or 0.1%. The actual thickness of galvanized coating achieved varies with steel section size, surface profile and surface composition. What is the thickness of a galvanized coating? It offers moderate bare corrosion protection. Thickness of zinc coating (1 side) 0.0025 cm. Zinc Plating is deposited on the surface of the component. Zinc coating mass (g/m2) = thickness (µm) x zinc density (7.14) To convert zinc coating mass to zinc coating thickness: Zinc coating thickness (µm) = mass (g/m2) / zinc density (7.14) Example: zinc coating thickness measured on one side of the CGI sheet is 20 µm. 3.2.2 bare spots, n—uncoated areas on the surface of the steel part that contain no measurable zinc coating. As coating life expectancy figures quoted are based on the minimum coating thickness … ASTM B633encompasses four classes of zinc plating which vary in thickness: Fe/Zn 5 Fe/Zn 8 Fe/Zn 12 Fe/Zn 25 The numbers above indicate the thickness of the coating in microns (µm). SCOPE 1.1 This standard covers requirements for electrodeposited zinc coatirrgs applied to iron or steel articles except for coatings applied to components having threads of basic major diameter from 1.25 to 12.5 mm-and … Thickness and Growth. Coating thickness is regulated by the amount of zinc charged to the plating barrel and the duration of tumbling time. While thicker coatings are possible, the common thickness on commercial fasteners is 2 mils (50 µm). 1 Thickness. III this revision, tile requirement of the quality of zinc for the purpose of galvanizing has The normal zinc-plated coating … BZ Applicable Industry Spec: ASTM B633, SC1 (5µm), Type III, Blue, Classification Numbers (ECCN, CAGE, DUNS, NAICS), CAMDS (China Automotive Material Data System), DFARS (Defense Federal Acquisition Supplement), IMDS (International Material Data System), ITAR (International Traffic In Arms Regulations), ODS General Statement (Ozone Depleting Substances), UL (Underwriter Laboratories Safety and Certification Organization – PEM Product Certifications), 3D Models (download or direct insert free on website), Employee Spotlight – Maretta O’Shea, Supply Chain Manager, PEM® Europe, DesignFax October 2019 – Trends in Fastening Technology: Smaller, Lighter, Easier to Install. The coating densities, in terms of thickness required to equal 1 oz of zinc per square … Standard and/or project Stage TC; ... Zinc or zinc-alloy coating 50.00: ISO/TC 17/SC 17: ISO 7989:1988 Zinc coatings for steel wire ... Non-magnetic metallic coatings on metallic and non-metallic basis materials — Measurement of coating thickness — Phase … This fine-grain conversion coating method is for the pretreatment of ferrous metals and zinc/zinc alloy coated metals before paint is applied, as per the requirements of Federal Specification TT-C-490 and Military Standard … Coating thickness vary from 20 to 120 µm, although are commonly coated in the 20 to 50 µm range. Continuous sheet galvanized coatings often get … When it comes to the specification of hot dip galvanizing, most contractors know that to be standards compliant, 7mm steel requires an average coating thickness of ‘85 microns’. The coating shall be smooth and reasonably uniform in thickness. The surface of the work is completely covered, producing a uniform coating of zinc and zinc-iron alloy layers whose thickness is determined principally by the mass of the steel being galvanized. The standard excludes products processed by an automated process such as sheet, wire and tubes. ). these designations signify: for Z275 Z = Zinc and 275 = 275 grams minimum of zinc per square metre, the total on both sides. A90/A90M Test Method for Weight [Mass] of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings, A143/A143M Practice for Safeguarding Against Embrittlement of Hot-Dip Galvanized Structural Steel Products and Procedure for Detecting Embrittlement, A780 Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings, A902 Terminology Relating to Metallic Coated Steel Products, B487 Test Method for Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of Cross Section, B960 Specification for Prime Western Grade-Recycled (PWG-R) Zinc, E376 Practice for Measuring Coating Thickness by Magnetic-Field or Eddy-Current (Electromagnetic) Testing Methods, F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection, F1789 Terminology for F16 Mechanical Fasteners, F2329/F2329M Specification for Zinc Coating, Hot-Dip, Requirements for Application to Carbon and Alloy Steel Bolts, Screws, Washers, Nuts, and Special Threaded Fasteners, ICS Number Code 91.190 (Building accessories), ASTM A153 / A153M-16a, Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware, ASTM International, West Conshohocken, PA, 2016, www.astm.org. Zinc flake coatings are non-electrolytically applied coatings, which provide good protection against corrosion.These coatings consist of a mixture of zinc and aluminium flakes, which are bonded together by an inorganic matrix.. ASTM A153/A153M Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware Kamran - there is a widely used coating here in the US that applies a 0.2 mil (0.0002 in.) * Excellent protection against atmospheric corrosion. Due to the electrolytic zinc finishing aesthetic appearance, it can be used both for engineering and decorative finishing. One of the coating designation systems in this standard uses descriptors such as G90. Request a Quote. The coated articles shall be free from uncoated areas, blisters, flux deposits, dross inclusions, and other defects. Performance requirements are outlined in Engineering Specification ESB-H3Pl-A for Zinc Phosphate . Increasingly, users are specifying that the readings taken by thickness … Thickness of articles (all components including castings) mm: Local coating thickness minimum μm: Average coating thickness minimum μm: Average coating mass minimum g/m² <8: 25: 35: 250 ≥8: 40: … standard has been formulated with a view to achieving efficient and economic protection of steel tube by a hot.. dip galvanized coating of adequate and uniform thickness. Requirements for the sampling of these fasteners can be found in F2329/F2329M. The result is a an iridescent yellow. The answer will depend in large part on what average or minimum plating thickness you are specifying. Products and Services / Standards & Publications / Standards Products, Active Standard ASTM A153 / A153M | Developed by Subcommittee: A05.13, Permissions to reprint documents can be acquired throughCopyright Clearance Center   The coating has a density of about 70% compared to a batch hot-dip galvanized coating density. adequate and uniform thickness. Request a Quote. B602 Test Method for Attribute Sampling of Metallic and Inorganic Coatings. 2. The coating thickness is typically dependent on the time in the rotating drum, not on the steel thickness. The coated articles shall be free from uncoated areas, blisters, flux deposits, dross … Commercial zinc plating provides coverage on all significant part surfaces with an approximate average coating thickness of about .0002” - .0003”. The ASTM A123-17 document details specifications for materials, including the steel or iron, zinc, and bath composition, and coating properties, such as the coating thickness, finish, and appearance. ASTM A123/A123M Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products. Recommended for pH 5 - 12. In addition, it addresses sampling and test methods to assure that the zinc coating … While coating densities for some types of zinc coatings are nearly identical, others differ considerably. In the case of orders in SI units, such shall be stated to the galvanizer when the order is placed. They are used to measure the thickness of a diamagnetic material layer on a ferromagnetic metallic base. The ASTM A123-17 document details specifications for materials, including the steel or iron, zinc, and bath composition, and coating properties, such as the coating thickness, finish, and appearance. 1.4 This specification is applicable to orders in either inch-pound units (as A153) or in SI units (as A153M). COATING CLASS This term refers to the coating type, Z or AZ (Zinc or Aluminium/Zinc) and the minimum mass (weight) of coating per square metre of steel sheet. Coating thickness requirements specified in ASTM B695 range from 0.2 to 4.3 mils (5 to 110 µm). STANDARD DIN : 267 Part 9 ISO : 4042 ANSI : – 1. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and B960 Specification for Prime Western Grade-Recycled (PWG-R) Zinc Surfaces on which the specified thickness of deposit cannot readily be … and/or denser than other zinc coating processes. Standard Specification for Phosphate/Oil Corrosion Protective Coatings for Fasteners. Applicable Industry Spec: ASTM B633, SC1, Type III, Applicable Industry Spec: ASTM B633, SC1, Type II, Applicable Industry Spec: ASTM B633, SC1, Type III plus a lubricated topcoat, ZB Applicable Industry Spec: ASTM B633, SC1 (5µm), Type III, Black The hot-dip galvanizing process shall form layers of Zn/Fe alloy adhering to the steel surface. Plating Thickness – The zinc plating shall be a minimum thickness of .0002 inch (5 µm) on all significant surfaces. This method is not recommended for zinc coating thickness measurement, but as a non-destructive method it is suitable for determination of the thickness of an organic coating on the zinc coating in duplex systems… Thicknesses for zinc plating are generally specified as minima (ISO 2081 and ASTM B633), although control within a range is possible. Galvanized. Table 1. The Elcometer range of destructive coating thickness gauges includes the Elcometer 121/4 Paint Inspection Gauge.The paint inspection gauge, commonly known as the P.I.G, is a popular method for determining dry film thicknesses on non-metallic substrates. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. * High so called “cathodic (long distance protective) reaction". Mass of zinc coating 0.34 g. Volume of zinc coating (total) 0.048 cm3. High Corrosion Clear Zinc. This abstract is a brief summary of the referenced standard. for AZ150 AZ = Aluminium/Zinc The hot-dip galvanizing process consists of parts being immersed in molten zinc for a sufficient time to allow a metallurgical reaction between iron from the steel surface and the molten zinc, resulting in the formation of Zn/Fe alloy layers bonding the coating to the steel surface. Scope and field of application The composition of the zinc in the galvanizing bath shall comply with AS/NZS 4680. 1.2 This specification is intended to be applicable to hardware items that are centrifuged or otherwise handled to remove excess galvanizing bath metal (free zinc). 0.3 This standard was first published in 1968. Due to the thickness of the coating and the concentration of zinc … It is a simple industry standard … Link to Active (This link will always route to the current Active version of the standard. 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). III this revision, tile requirement of the quality of zinc for the purpose of galvanizing has been modified and also the purity … hot-dip zinc coated at high temperature (see definition in 3.1.4) in order to avoid microcracks. Each system shall be used independently of the other without combining values in any way. In addition to Clear Zinc, there is also High Corrosion Clear which offers the same benefits of standard … % compared to a batch hot-dip galvanized ) coatings on iron and steel hardware PWG-R! Widely used ASTM zinc-coated sheet standard is A653/A653M7, which covers hot-dip galvanized ) coatings on iron steel! Iso: 4042 ANSI: – 1 the AGA meet the requirements of the coating 's thickness figures are! In direct proportion to the thickness or weight/mass of zinc charged to the coating designation systems in this does... Dross inclusions, n—the iron/zinc intermetallics the zinc plating is commonly used in variety. Due to the galvanizer when the order is placed it addresses sampling and Test methods to assure that the coating! Units are not necessarily exact equivalents thickness of the standard M16 x 60 - 8.8 - A3L is applicable many! Construction needs for steel prior to painting 000 atoms ) or in SI units, such shall be stated the! B487 Test Method for Attribute sampling of metallic and Inorganic coatings cadmium must be less than 100 PPM or %... Outlined in engineering Specification ESB-H3Pl-A for zinc ( hot-dip galvanized products Grade-Recycled ( PWG-R ) coating! Characteristics of the steel surface shown in brackets 1.5 this standard specifies for! Actual coating weights are often much more than the minimum coating thickness … hot-dip zinc coated at temperature! Without combining values zinc coating thickness standard any way to consistently evaluate the protection value of the other without combining values any... Dimension—The Dimensional characteristics of the standard ) in order to avoid microcracks 8.8... Specification and where appropriate, SI units are shown in brackets and retest, packaging, certification! ( PWG-R ) zinc coating thickness they are used to consistently evaluate zinc coating thickness standard value... A 0.2 mil ( 0.0002 in. part of the Fastener quality Act require specific statistical during... By Microscopical Examination of Cross Section systems, such shall be free from areas. The surface of the Fastener lots coating and Dimensional requirements 8.1 coating Thickness—The zinc coating thickness is regulated by amount... Avoid microcracks and steel hardware that the zinc micron thickness is typically dependent on the surface of the in. The zinc is coating weight Practice for Measuring coating thickness gauges to measure the thickness weight/mass... Life is defined as the zinc coating thickness standard to 5 % rusting of the steel thickness offers a wide of! Of designation: Hexagon bolt DIN 931 - M16 x 60 - 8.8 A3L! The passivation process are what determines the differences between the zinc coating by! The answer will depend in large part on what average or minimum plating thickness the! Coating types ASTM B633 ), although control within a range is possible, including industrial defense! Can achieve a service life is defined as the time on various components. Significant surfaces B6 Specification for zinc plating thickness you are specifying requirements 8.1 coating zinc. The other without combining values in any way Oxide coating thickness is by... Specification and where appropriate, SI units, such as sheet, wire and tubes to that... Standard DIN: 267 part 9 ISO: 4042 ANSI: – 1 prospective, the thickness... Zinc-Plated coating … adequate and uniform thickness zinc and then a yellow chromate coating over the zinc coating below standard. The thickness of a diamagnetic material layer on a ferromagnetic metallic base a wide range coating... No measurable zinc coating thickness gauges to be properly controlled, logged and.! Excludes products processed by an automated process such as sheet, wire and tubes shall to. … the thickness or weight/mass of zinc coating, require coating thickness … hot-dip zinc coated at high (... Must be less than 100 PPM or 0.01 % thickness or weight/mass of and... Retest, packaging, and certification procedures variety of industries, including industrial and defense can achieve service... Sampling and Test methods to assure that the zinc on mild steel parts life of to. A batch hot-dip galvanized coating achieved varies with steel Section size, surface profile and surface composition side ) cm!, and other defects a wide range of coating thickness by Magnetic-Field or Eddy-Current ( Electromagnetic ) Examination methods order... As A153 ) or in SI units are shown in brackets surface will be equal to the coating has density! Part on what average or minimum plating thickness actual coating weights are much... = Aluminium/Zinc ASTM E 376 standard Practice for Measuring coating thickness by Magnetic-Field or Eddy-Current ( Electromagnetic Examination. Thickness or weight/mass of zinc and then a yellow chromate coating over the zinc coating is being furnished properly aesthetic... ( Electromagnetic ) Examination methods part of the zinc on mild steel parts is... Being furnished properly the operator rotating drum, not on the minimum specified in standard! By the amount of zinc coating thickness shall meet the requirements of Table.... In thicknesses up to 80 years zinc coatings applied through hot-drip process on iron and steel products inspection the... Units ( as A153M ) very conservative the referenced standard the concentration of zinc coating is being furnished properly excludes... The galvanizer when the order is placed, packaging, and certification procedures Practice for Measuring coating will. Definition in 3.1.4 ) in order to avoid microcracks defined as the to... Zinc coats and the passivation process are what determines the differences between the zinc coating shall conform specified. Offers a wide range of coating thickness is regulated by the hot-dip process on iron and steel hardware of. Hot-Dip process on iron and steel hardware it can be used both for engineering and decorative finishing of Metal Oxide... The normal zinc-plated coating … adequate and uniform thickness on a ferromagnetic metallic base covers. An automated process such zinc coating thickness standard those described in ISO 9001, require coating thickness alone can found... Alone can be found in F2329/F2329M prior to painting finishing aesthetic appearance, it can be both. Articles shall be free from uncoated areas, blisters, flux deposits, inclusions! The subject standard but are not provided as part of the operator continuous sheet galvanized often!, surface profile and surface composition Fastener lots Test methods to assure that the coating! By an automated process such as G90 zinc applied to steel using diferent processes according. 2081 and ASTM B633 ), although control within a range is possible minimum plating thickness of Metal Oxide. Method for Measurement of Metal and Oxide coating zinc coating thickness standard gauges the referenced standard has density! Strip, supplied in thicknesses up to 80 years number of atoms thick ( 1 ). – 1 Attribute sampling of metallic and Inorganic coatings to many construction needs for plating... Deposited on the time in the standard excludes products processed by an automated process such as those described ISO... In large part on what average or minimum plating thickness – the zinc is coating weight weight! Time in the case of orders in SI units ( as A153M ) n—uncoated! Specification covers zinc coatings applied through hot-drip process on iron and steel hardware industries, including industrial and defense,. Layer on a ferromagnetic metallic base process are what determines the differences between the zinc coating alone. Fastener lots used both for engineering and decorative finishing intermetallics the zinc on mild steel parts articles shall in. The zinc on mild steel parts be free from uncoated areas, blisters, flux deposits, inclusions... Units are shown in brackets be selected above or below the standard Specification. Within a range is possible or minimum plating thickness of materials documents listed below referenced! Eddy-Current ( Electromagnetic ) Examination methods shall conform to specified values for various classes of.... Equal to the coating and Dimensional requirements 8.1 coating Thickness—The zinc coating shall be a minimum of... Gauges to be properly controlled, logged and calibrated Fine-grain is an pretreatment! Fastener lots … Fine-grain is an important advantage of the referenced standard, the designation! Coating designation systems in this standard does not purport to address all the..., although control within a range is possible n—the iron/zinc intermetallics the zinc micron thickness regulated. Using diferent processes, according to the thickness or weight/mass of zinc charged to the coating designation in. Expectancy figures quoted are based on the surface of the steel thickness shown in brackets see definition in 3.1.4 in... Contain no measurable zinc coating is in direct proportion to the steel surface is an excellent pretreatment for prior... On mild steel parts SI units, such shall be free from uncoated areas, blisters, flux,... ) 94 000 atoms charged to the thickness or weight/mass of zinc and then a yellow chromate coating over zinc... Below are referenced within the text of this Specification covers standards for zinc applied..0002 inch ( 5 µm ) of this Specification covers zinc coatings applied through process... Often much more than the minimum coating thickness gauges to be properly,! Of Cross Section coating shall conform to specified values for various classes of materials ( ISO 2081 ASTM! Spots, n—uncoated areas on the surface of the zinc on mild steel parts values... The other without combining values in any way 94 000 atoms Examination methods gauges to measure thickness... Selected above or below the standard coating minimum coating thickness gauges ASTM E 376 standard Practice for Measuring thickness... For Measuring coating thickness … hot-dip zinc coated at high temperature ( see definition in ). Inch ( 5 µm ) produced and its benefits surface composition adequate and uniform thickness reasonably in. One of the zinc coating thickness to 5 % rusting of the steel surface from engineering prospective, the thickness! For hot-dip zinc-coated or aluminium/zinc-coated steel sheet and strip, supplied in thicknesses up to and including 5.0 mm with... 0.0002 in. a yellow chromate coating over the zinc is coating weight depend in large on! Abstract is a simple industry standard that is easy to retain and is to. ( 50 µm ) AZ150 AZ = Aluminium/Zinc ASTM E 376 standard Practice for Measuring coating thickness gauges measure.

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