Standard practice for repair of damaged and uncoated areas. Astm azinc dust in paint american galvanizers association. Must be applied directly to dry, clean metal or galvanized surfaces and not over any other paint or coating. A780 a780m092015 standard practice for repair of damaged and uncoated areas of hotdip galvanized coatings hotdip galvanizing coating damage repair zinccoated steel products. Guidelines for inspection and acceptance of epoxycoated reinforcing steel at the jobsite.
Flat gray cold galvanizing compound spray7585838 the home depot. 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. Apply this flat gray cold galvanizing compound from rustoleum professional on your interior surfaces to get a galvanized finish. Astm a 780 provides guidelines to follow with respect to touchup and repair. 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. 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. Question what are the most commonly used specifications. Guidelines for inspection and acceptance of epoxycoated. Astm international astm a78000 standard practice for. 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.
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. When it comes to repairing galvanized steel in the field, there is no limitation to atm size that can be repaired. Zincclad cold galvanizing compound sherwinwilliams. Touchup and repair of galvanized steel american galvanizers. Topics include proper materials to use while astm a780 the process, as well as specifications to follow and proper application of the repair materials. Galvanizing, which is the use of a zinc coating to serve as a sacrificial anode to. The touchup and repair of hotdip galvanized steel coatings is important to maintain uniform barrier and cathodic astm a780 as well as ensure longevity.
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. Hotdip galvanizing complies with numerous astm standards. Astm a780 a780m09, standard practice for repair of damaged and uncoated areas of hotdip galvanized coatings, astm international, west conshohocken, pa, 2009. 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. Astm a780 01 standard practice for repair of damaged and. Field touch up recommendations for hot dip galvanized. 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.
The coating contains 95% pure zinc in the dry filmfor maximum corrosion resistance. The various parties may desire special handling or require alterations to the design to facilitate the galvanizing process and or the application of paint. Astm a780 includes three acceptable methods of touchup and repair of hotdip galvanized steel. Astm a780a780m092015 standard practice for repair of. If the following conditions are present, we recommend repairing the affected areas with zincrich paint. Standard practice for repair of damaged and uncoated areas of.
The material provided herein has been developed to provide accurate and authoritative information about afterfabrication hotdip galvanized steel. Repair of damaged and uncoated areas of hotdip galvanized coatings1 this standard is issued under the fixed designation a780 a780m. Astma780 standard practice for repair of damaged and. On areas damaged by welding, remove any weld spatter by wire brushing or equivalent, before use of brite zinc. The best repair procedure is metallizing to astm a780 a3. Repairing hdg steel american galvanizers association. Astm a780 repair of damaged and uncoated areas of hotdip. The damage may be the result of welding or cutting flame, in which case the coating will be damaged predominantly by burning. The damage may be the result of welding or cutting flame, in which case the coating will.
The primer needs to be top coated with a galvanizing paint meeting astm a780 specifications. Meets and exceeds galvanizing repair specifications astm des. Corrosion resistance and service performance are very dependent on the properties of the paint system, the extent of surface prepara tion, and skills of individual applicators. Corrosion resistance and service performance are very dependent on the properties of the paint system, the extent of surface preparation, and skills of individual. Why is there a gap in the amount of zinc dust in the paints listed in astm a780. Because paint formulations are constantly changing, paint manufacturers should. These technical committees maintain approximately 12,000 standards that help guide a wide range of industries. 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. The aga has an online video series for touchup and repair of hotdip galvanized steel. Twoyear rustproof guaranteemaximum corrosion protection. 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. Active standard astm a780 a780m developed by subcommittee. Zirp is a cold galvanizing compound designed to comply with astm a780 requirements for the touchup and repair of damaged hot dip galvanized coatings. Astm a780 a780m 092015 standard practice for 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 areas of hotdip galvanized coatings, can be completed in three different ways, including the use of zincrich paint, zinc solders andor zinc metallizing. This will provide protection and give similar appearance to galvanized steel. Differentiate hotdip galvanizing from other zinc coatings. This primer has the bright finish of a hotdip galvanized coating. Designed specifically for field and shop repair of hot dip galvanizing.
In most instances, incorrect or inadequate surface preparation is generally the cause of a coating. Repair damaged galvanized coatings with zirp zinc rich cold. Six short videos detail the many aspects to consider when touching up or repairing hdg steel. The specification explains how to use the various repair methods as well as the required coating thickness for the. Touchup and repair of galvanized steel, to meet astm a780 standard practice for repair of damaged and uncoated. Astm a780 a780m 09 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. A comprehensive list of citations to this standard are listed here. A1094a1094m specification for continuous hotdip galvanized steel bars for concrete reinforcement. Inorganic binders are particularly suitable for paints applied in touchup applications of undamaged hotdip galvanized areas.
A902 terminology relating to metallic coated steel products. These zincrich paints are suitable for repairing damaged galvanized coatings, provided the dried film contains not less than 65% zinc dust by weight. Repair of damaged and uncoated areas of hotdip galvanized. Galvanizing provides cathodic protection so that small scratches and damage in the field do not need to be touched up. Galv what does the cold galvanizing process consist of.
A780 practice for repair of damaged and uncoated areas of hotdip galvanized coatings. Surface preparation surface preparation is the most important step in the application of any coating. Do not use if spray button is missing or defective. Instantly galvanize metal surfaces to protect them from corrosion with rustoleum stops rust cold galvanizing compound spray. 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. Do not average the readings, as this requirement was removed from the specifications in galv touch up methods dr. Astm a780 practice for repair of damaged and uncoated areas of hotdip galvanized coatings details how to repair a damaged hotdip galvanized coating. 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. The hotdip galvanizing process the galvanizing process consists of three basic steps.
High performance 7000 system cold galvanizing compound. Instantly galvanize metal surfaces or repair worn or damaged galvanized steel with rustoleum high performance 7000 system cold galvanizing compound. Brite products is an innovative leader in the manufacturing and distribution of zincrich coating solutions for longterm protection of steel. A780a780m or equivalent as determined by the supervising engineer or customer.
Single pack, premixed, readytoapply liquid organic zinc compound general properties. Jun 25, 2019 galv what does the cold galvanizing process consist of. Standard practice for repair of damaged and uncoated areas of hotdip galvanized coatings. 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. Protective coatings products such as those produced by jotun are recommended for galvanizing repair. The repair paint to be used shall be selected by the galvanizer.
Zrc is a highquality cold galvanizing compound based on a trade secret organic binder which affords true galvanic anticorrosion protection to metals. Proper surface preparation contributes to maximum service life of coatings. To ensure that a smooth reconditioned coating can be effected, surface preparation shall extend into the undamaged galvanized coating. 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. Touchup and repair of hotdip galvanized steel youtube. Astm a780 repair of damaged and uncoated areas of hot. 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. Astm a780 00 standard practice for repair of damaged and. An excellent, fast drying touchup for repair of galvanized substrates. Astm a780, standard practice for repair of damaged and. 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. Astm a780 a780m092015, standard practice for repair of damaged and uncoated areas of hotdip galvanized coatings, astm international, west conshohocken, pa, 2015. Repair damaged galvanized coatings with zirp zinc rich.
Practice for preparation of zinc hotdip galvanized coated iron and steel product and hardware surfaces for painting. A780 standard practice for repair of damaged hotdip galvanized coatings meets and exceeds sspc paint 20. 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. The repair paint to be used shall be selected by the galvanizer, unless the purchaser speci. 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. Weld and damaged areas of hotdip galvanizing touchup of zinc rich primers substations aim voc compliantsee note on thinning instructions. Oct 28, 2018 galv what does the cold galvanizing process astm a780 of. For nearly 30 years, its premier product brite zinc has been the industry choice for the onestep.
Astma780 standard practice for repair of hotdip brite. Astm a780 00, standard practice for repair of damaged and uncoated areas of hotdip galvanized coatings, astm international, west conshohocken, pa, 2001. I live on a farm and it seems that the siding we use on the. Keep away from open flames, hot surfaces and sources of ignition. The touchup and repair of hotdip galvanized steel coatings is important to maintain uniform barrier and cathodic protection as well as aa780 longevity. 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. While daam galvanizing can perform these repairs, theyre rarely required because of the low corrosion potential of damaged areas. It is an excellent touchup for the repair of galvanized substrates that have been damaged by abrasion. Because of the uniqueness of the formulation, zrc is the only coating of its type to be recognized under. Astm a780 a780m 092015 standard practice for repair. Repair material should extend at least three inches beyond edges of damaged areas, to ensure continuity of galvanic action. Astm a780 a780m 092015 standard practice for repair of. Astm a contains three acceptable methods of touchup and repair of hotdip galvanized steel.
Citing astm standards citation data is made available by participants in crossrefs citedby linking service. 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. Silver finish closely blends in with the color of new hot dip galvanizing. Areas suitable for touchup and repair are defined in astm a123. The hot dip galvanized patch coating process should comply with astm. 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. The specification explains how to use the various repair methods as well as the required coating thickness for the repaired area.
All contaminates mill scale, rust, rust scale, chemicals, grease, oil, wax, weld spatter, old paint or other foreign matter must be removed down to bare metal. Astm international astm a780 00 standard practice for repair of damaged and uncoated areas of hotdip galvanized coatings historical buy now. Using a clean cloth, handwipe surface to remove any residue from. Paint communicate with the galvanizer communication between the fabricator, specifier, painter, and galvanizer is vital before galvanizing. This practice can also be used to repair hotdip galvanized coatings damaged by excessively rough. Astm a780zinc dust in paint american galvanizers association. 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.