Astm a780a780m092015 standard practice for repair of. Jul 20, 2017 touchup and repair of hotdip galvanized steel is key to maintaining a uniform barrier, providing cathodic protection, and ensuring coating longevity and continued corrosion protection. Astm a780 practice for repair of damaged and uncoated areas of hotdip galvanized coatings details how to repair a damaged hotdip galvanized coating. Zincrich paint is applied to a clean, dry steel surface a7800 either a brush or spray. The touchup and repair of hotdip galvanized steel coatings is important to maintain uniform barrier and cathodic protection as well as aa780 longevity. Weld and damaged areas of hotdip galvanizing touchup of zinc rich primers substations aim voc compliantsee note on thinning instructions. The best repair procedure is metallizing to astm a780 a3.
Paints containing zinc dust, with concentrations of zinc dust in the range of 65 to 69 % or above 92 %in the dried film, are considered equally effective for the repairof damaged galvanized coatings. Repair of damaged and uncoated areas of hotdip galvanized coatings1 this standard is issued under the fixed designation a780 a780m. Astm a780 repair of damaged and uncoated areas of hotdip. The repair paint to be usedshall be selected by the galvanizer, unless the purchaserspecifies a particular concentration or paint system. The hot dip galvanized patch coating process should comply with astm. A780 a780m092015 standard practice for repair of damaged and uncoated areas of hotdip galvanized coatings hotdip galvanizing coating damage repair zinccoated steel products. A902 terminology relating to metallic coated steel products.
Astm a780 a780m 092015 standard practice for repair of damaged and uncoated areas of hotdip galvanized coatings. Astm azinc dust in paint american galvanizers association. These technical committees maintain approximately 12,000 standards that help guide a wide range of industries. It is an excellent touchup for the repair of galvanized substrates that have been damaged by abrasion. Touchup and repair of hotdip galvanized steel youtube.
Astm international astm a780 00 standard practice for repair of damaged and uncoated areas of hotdip galvanized coatings historical buy now. When it comes to repairing galvanized steel in the field, there is no limitation to atm size that can be repaired. May 12, 2019 astm a780 pdf astm a practice for repair of damaged and uncoated areas of hotdip galvanized coatings details how to repair a damaged hotdip galvanized coating. For nearly 30 years, its premier product brite zinc has been the industry choice for the onestep. Protective coatings products such as those produced by jotun are recommended for galvanizing repair. Touchup and repair of galvanized steel american galvanizers. Standard practice for repair of damaged and uncoated areas. Jun 25, 2019 galv what does the cold galvanizing process consist of. Brite products is an innovative leader in the manufacturing and distribution of zincrich coating solutions for longterm protection of steel.
Galvanizing provides cathodic protection so that small scratches and damage in the field do not need to be touched up. Effective may 1st astm a780 when it comes to repairing galvanized steel in the field, there is no limitation to the size that can be astm a780. A780 standard practice for repair of damaged hotdip galvanized coatings meets and exceeds sspc paint 20. Repair material should extend at least three inches beyond edges of damaged areas, to ensure continuity of galvanic action. Galv what does the cold galvanizing process consist of. Astm a385 practices for highquality coatings astm a1068 lifecycle cost analysis of steel corrosion protection postgalvanizing specs astm a780 touchup and repair of galvanized products astm d6386 surface preparation for painting over galvanizing astm d7803 surface preparation for powder coating over galvanizing. Flat gray cold galvanizing compound spray7585838 the home depot. These zincrich paints are suitable for repairing damaged galvanized coatings, provided the dried film contains not less than 65% zinc dust by weight. Standard practice for repair of damaged and uncoated areas of hotdip galvanized coatings.
The repair paint to be used shall be selected by the galvanizer, unless the purchaser speci. The various parties may desire special handling or require alterations to the design to facilitate the galvanizing process and or the application of paint. This 93% pure zinc coating applies a galvanized film with cathodic protection, which resists rusts, scratches and chips. Astm a780 repair of damaged and uncoated areas of hotdip galvanized coatings. Touchup and repair of galvanized steel, to meet astm a780 standard practice for repair of damaged and uncoated.
A780a780m or equivalent as determined by the supervising engineer or customer. Meets and exceeds galvanizing repair specifications astm des. Differentiate hotdip galvanizing from other zinc coatings. Astm a780, standard practice for repair of damaged and. This is a common question and the topic of zinc dust concentration in zincrich paint is commonly misunderstood, so lets start with the exact wording from section 4. On areas damaged by welding, remove any weld spatter by wire brushing or equivalent, before use of brite zinc. May 28, 2019 astm a780 pdf astm a practice for repair of damaged and uncoated areas of hotdip galvanized coatings details how to repair a damaged hotdip galvanized coating. Field touch up recommendations for hot dip galvanized. To ensure that a smooth reconditioned coating can be effected, surface preparation shall extend into the undamaged galvanized coating. Because of the uniqueness of the formulation, zrc is the only coating of its type to be recognized under. Proper surface preparation contributes to maximum service life of coatings. Astm a contains three acceptable methods of touchup and repair of hotdip galvanized steel. Standard practice for repair of damaged and uncoated areas of.
A780 01 standard practice for repair of damaged and uncoated areas of hotdip galvanized coatings, coatingszinc, galvanized coating repair, galvanized coating, touchup, zinc coating repair, zinc coatings. Active standard astm a780 a780m developed by subcommittee. Oct 28, 2018 galv what does the cold galvanizing process astm a780 of. Apply the paint as recommended by the paint manufacturer in a single application employing multiple spray passes to achieve a dry film thickness to be agreed upon between the. Why is there a gap in the amount of zinc dust in the paints listed in astm a780. Astm a780 replica tape is utilized, two readings are to be taken over each location and averaged to get one measurement of the profile of the surface. In most instances, incorrect or inadequate surface preparation is generally the cause of a coating. Repairing hdg steel american galvanizers association. Touchup and repair of hotdip galvanized steel is key to maintaining a uniform barrier, providing cathodic protection, and ensuring coating longevity and continued corrosion protection. Guidelines for inspection and acceptance of epoxycoated. Hotdip galvanizing complies with numerous astm standards. Inorganic binders are particularly suitable for paints applied in touchup applications of undamaged hotdip galvanized areas. Because paint formulations are constantly changing, paint manufacturers should. Astm is composed of more than 30,000 technical experts from 5 countries around the world, with each expert serving on one of 141 technical committees.
Ideal for easy maintenance zirp has a very high molecular weight epoxy resin binder, which features the outstanding adhesion and chemical resistance characteristics of converted epoxies but with. Repair damaged galvanized coatings with zirp zinc rich cold. The specification explains how to use the various repair methods as well as the required coating thickness for the repaired area. Astm a780 00 standard practice for repair of damaged and. Topics include proper materials to use while astm a780 the process, as well as specifications to follow and proper application of the repair materials. Instantly galvanize metal surfaces to protect them from corrosion with rustoleum stops rust cold galvanizing compound spray. The material provided herein has been developed to provide accurate and authoritative information about afterfabrication hotdip galvanized steel. Instantly galvanize metal surfaces or repair worn or damaged galvanized steel with rustoleum high performance 7000 system cold galvanizing compound. I live on a farm and it seems that the siding we use on the.
Paint communicate with the galvanizer communication between the fabricator, specifier, painter, and galvanizer is vital before galvanizing. At the galvanizing facility, the maximum allowable repair size for iron astm a780 steel products per astm a is no more than 1 inch 2. Astm a780zinc dust in paint american galvanizers association. A comprehensive list of citations to this standard are listed here. Guidelines for inspection and acceptance of epoxycoated reinforcing steel at the jobsite. Astm a780 pdf astm a practice for repair of damaged and uncoated areas of hotdip galvanized coatings details how to repair a damaged hotdip galvanized coating. High performance 7000 system cold galvanizing compound. Astm a780 practice for repair of damaged and uncoated areas of hotdip galvanized coatings details how to repair a damaged hotdip galvanized coating regardless if it is immediately after galvanizing or once it is in the field. Repair damaged galvanized coatings with zirp zinc rich.
Twoyear rustproof guaranteemaximum corrosion protection. Galvanizing, which is the use of a zinc coating to serve as a sacrificial anode to. While daam galvanizing can perform these repairs, theyre rarely required because of the low corrosion potential of damaged areas. This primer has the bright finish of a hotdip galvanized coating. Astm a780 01 standard practice for repair of damaged and. Areas suitable for touchup and repair are defined in astm a123. A780 practice for repair of damaged and uncoated areas of hotdip galvanized coatings.
Astm a780 a780m092015, standard practice for repair of damaged and uncoated areas of hotdip galvanized coatings, astm international, west conshohocken, pa, 2015. Surface preparation surface preparation is the most important step in the application of any coating. Question what are the most commonly used specifications. The thurston avenue bridge utilizes a duplex system of paint over hotdip galvanized hdg steel for corrosion protection workers prepare the surface of a galvanized structure for paint by filing off any bumps. Aug 02, 2019 astm a780 pdf astm a practice for repair of damaged and uncoated areas of hotdip galvanized coatings details how to repair a damaged hotdip galvanized coating. Touchup and repair american galvanizers association. Single pack, premixed, readytoapply liquid organic zinc compound general properties. Do not average the readings, as this requirement was removed from the specifications in galv touch up methods dr. Welding to galvanized steel per astm a780 hendrickson. The damage may be the result of welding or cutting flame, in which case the coating will. This will provide protection and give similar appearance to galvanized steel. Astm a780 includes three acceptable methods of touchup and repair of hotdip galvanized steel.
Must be applied directly to dry, clean metal or galvanized surfaces and not over any other paint or coating. Astm a780 a780m 09 standard practice for repair of. Touchup and repair of galvanized steel, to meet astm a780 standard practice for repair of damaged and uncoated areas of hotdip galvanized coatings, can be completed in three different ways, including the use of zincrich paint, zinc solders andor zinc metallizing. The damage may be the result of welding or cutting flame, in which case the coating will be damaged predominantly by burning. Meets astm a780 01 passes 1,000 hours per astm d165492 sprayon wl839 high performance silver galvanizing compound is a metallic zinc sacrificial coating that inhibits rust and corrosion on ferrous and nonferrous metals. An excellent, fast drying touchup for repair of galvanized substrates.
Zincclad cold galvanizing compound sherwinwilliams. Astm a780 00, standard practice for repair of damaged and uncoated areas of hotdip galvanized coatings, astm international, west conshohocken, pa, 2001. Any repairs made to galvanized products must follow the requirements of astm a780 practice for repair of damaged and uncoated areas of hotdip galvanized coatings, which defines the acceptable materials and the required procedures. Astm a780 repair of damaged and uncoated areas of hotdip galvanized coatings free download as pdf file. A767a767m specification for zinccoated galvanized steel bars for concrete reinforcement. Apply this flat gray cold galvanizing compound from rustoleum professional on your interior surfaces to get a galvanized finish. Zrc is a highquality cold galvanizing compound based on a trade secret organic binder which affords true galvanic anticorrosion protection to metals. Astm a780 repair of damaged and uncoated areas of hot. Silver finish closely blends in with the color of new hot dip galvanizing. Designed specifically for field and shop repair of hot dip galvanizing. The repair paint to be used shall be selected by the galvanizer. Jun 07, 2010 astm a780 states zincrich paint with zinc dust in the ranges of 6569% or above 92% in the dried film are equally effective. Corrosion resistance and service performance are very dependent on the properties of the paint system, the extent of surface preparation, and skills of individual.
Repair of damaged and uncoated areas of hotdip galvanized. The hotdip galvanizing process the galvanizing process consists of three basic steps. Using a clean cloth, handwipe surface to remove any residue from. Zirp is a cold galvanizing compound designed to comply with astm a780 requirements for the touchup and repair of damaged hot dip galvanized coatings. The specification explains how to use the various repair methods as well as the required coating thickness for the. The touchup and repair of hotdip galvanized steel coatings is important to maintain uniform barrier and cathodic astm a780 as well as ensure longevity. Astm a 780 provides guidelines to follow with respect to touchup and repair. Flat gray cold galvanizing compound spray the home depot. Astm international astm a78000 standard practice for. If the following conditions are present, we recommend repairing the affected areas with zincrich paint. Practice for preparation of zinc hotdip galvanized coated iron and steel product and hardware surfaces for painting. The aga has an online video series for touchup and repair of hotdip galvanized steel. Citing astm standards citation data is made available by participants in crossrefs citedby linking service. Astm a780 a780m 092015 standard practice for repair of.
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