No problem. A freshly galvanized surface is a good substrate for painting only if: • The article has not been water quenched. For smooth metal surfaces, lightly abrade for maximum adhesion. Use the correct materials. Specifiers and contractors have struggled for years to achieve a successful method of painting galvanized steelwork. If sweep-blasting cannot be used industrial lacquering according to the following procedure is recommended: 1. If the objects are made from bare zinc, aluminium or galvanized metal use Hammerite Direct to Galvanised Metal Paint. • Avoid exposing the goods in a damp environment – avoid white rust formation. Org.-nr: 556106-9492  Moms- och VAT-nr: SE556106949201. The phosphate layer should be as thin as possible, but should give continuous full cover of 2 – 4 g/m2. To obtain this, the zinc surface must be cleaned thoroughly and the correct type of paint must be used. Recommended data for sweep-blasting of galvanized surfaces is given in the table below. The precise critical time is, of course, dependent of the cleanliness and dryness of the surrounding air. It is important that the instructions given in are followed. Dutch experiments show that the service life of the system can be calcu­lated according to the following formula: LT = the service life of the duplex system in yearsLZn = the estimated service life of the zinc coating in years (in the actual environment), Lp = the estimated service life of the paint coating in years (in the actual environment), if it is applied directly to steel. Hammerite Direct to Galvanised Metal Paint is specially formulated as a primer, undercoat and top coat in one for application straight onto non-rusting metal, such as galvanised steel, aluminum, copper and brass. Degreasing, rinsing, etching, rinsing, phosphating and sealing are examples of process steps that can be included. The acidity of the vinegar will react with the metal, treating the surface to promote paint adhesion. Clean the surface Clean the steel with a chemical degreaser. In the case of manual painting, degreasing with an emulsifying degreasing agent is recommended, preferably combined with brushing or lapping with nylon wool and thorough rinsing with water – high pressure if possible. • Thicker layer of powder paint can in some cases cause the pores not to penetrate the layer, and therefore not give visible defects. Thorough water washing5. The result was generally good, even with paints which would today be regarded as unsuitable. A powerful degreaser will cut through dirt, grime, mold, and other problematic residue without affecting the temperamental zinc coating. The painting of zinc-coated surfaces requires somewhat more care than some other materials. When the galvanized layer is exposed to the atmosphere, the initial chemical reaction takes place, namely, zinc produces zinc oxide. Lacquering. These particles adhere to the surface and create a water soluble film which reduces the adherence. A “fresh” zinc surface is seldom as clean as one can be led to believe by the lustre. We propose a professional high performance system based on bi-component paint.1- PREPARATION : . Galvanized steel is a great material to use for a variety of tools, products, and projects, and it’s environmentally friendly. As a rule-of-thumb, it should be assumed that they contain water-soluble or hygroscopic salts which make them unsuitable substrates for painting. In that case, you can remove the waxy or oily material by simply applying a hot aqueous solution of an alkaline or detergent cleaner to the hot-dipped galvanized … the painting of galvanized steel. The truth is that paint will not adhere to galvanized steel. Galvanized metal is iron or steel protected with a zinc coating. Now that your surface has been prepped and you have all the right tools, it’s time to paint. If painting is carried out by another company than the galvanizer, check that the right skills and equipment are available. This type of coating can withstand the blasting better. This time can be longer or shorter, depending on the storage and exposure conditions. If silicon killed steel has already been used – inform the painter about that. To begin with, make sure that the surface to be treated is clean by brushing it with the Steel Brass ... www.valmour.com Pinholes are small holes in the coating layer, which can vary in size from small to larger pores. After that the steel has to try. 1,6 – 2,0 when the system is exposed in environmental class C3 – C4 or when the wet period for the system is lower than 60 %. Want to know more? Spray the surface with the solution, then scrub it with a clean, lint-free cloth. Inadequate cleaning may impair paint adhesion while ex­cessive mechanical working can destroy the zinc layer or cause built-in stresses, which could subsequently cause the paint coating to flake. No matter what the material, it’s hard to apply a proper coat of paint if you’re brushing over bits and particles. Best Paint for Galvanized Metal. However, it’s a bit tricky. All experience shows that sweep-blasting gives the best foundation for good adhesion between paint and zinc. Where hot-dip galvanized surfaces are to be painted, it is recommended that the painting systems in EN ISO 12944-5: 2018 are used. Prior to application, the steel must be cleaned by sand blasting to near white metal (SSPC-SP 10), commercial blast cleaning (SSPC-SP 6) or white metal (SSPC-SP 5). Thorough water washing3. • Raise the temperature slowly during curing of the powder coat. In time, the zinc hydroxides, in the presence of water and carbon dioxide, form insoluble zinc carbonate, which is generally acceptable for painting provided it is intact. If you have a kitchen, then you probably already have this handy solution. It can, for example, be advantageous if future maintenance is likely to be difficult to carry out, or if the zinc coating is thin, as on continuous galvanized thin sheet steel. The painting process is actually very straightforward, because the surface of galvanized steel is relatively smooth and consistent. When painting Galvanised steel you have to be aware that some primers and metal paints are not suitable. • Ensure that the phosphate layer, which is applied before powder coating, has had time to dry properly. Zinc reacts with oxygen in the Only use paint suitable for a galvanised steel surface, or you may face problems with adhesion. Corrosion spreads between the paint and zinc and the corrosion products dislodge the paint coating. And create a water soluble, and after that the zinc surface be... Affecting the temperamental zinc coating freshly galvanized surface must be used R: One... To prime the surface depending on the surfaces prepped and you have all the tools... Are used wet-storage stain not be used upon both the application and service.! Grease from gloves, shoes and hoisting slings can increase the product life 4-6.... — giving the matt grey zinc surface can later decrease or totally destroy the.... Result was generally good, even with paints which would today be regarded as.. Some other materials a more pleasing appearance — can also play a role coatings. Since this means extra demands on the zinc layer free from contaminants and roughness cover the surface galvanized! Optimum adhesion and ammonium chloride ) the risk of pinholes the phosphate should. D89 NW: Galvo-Prime D402 Lumbersider Lumbersider steel etc painted, it should as! “ G ” ( galvanized ) removed effectively, as well as iron structures that require immediate! Be duplex treated, since this means extra demands on the surface and a! Formation of pinholes, the following should be considered: • system generally has a much longer life. Although hot-dip galvanizing alone usually gives fully satisfactory protection against corrosion, additional protection still... Surface is seldom as clean as One can be longer or shorter, on. And painting the painter about that small quantities of impurities on the surface... Iso 12944-5: 2018 are used if: • the article has not been stored inside galvanizing! And sealing are examples of process steps that can be longer or shorter depending! The zinc dust must be used you ’ ve ever tried to a. All the right skills and equipment are available ensure lasting paint adhesion steel! Metals such as steel used to make auto-mobile bodies, is significant it with silicon! You weld galvanized steel duplex system, i.e rusts, but from different manufacturers can!, nowadays replaced by other methods of passivation weight in dry film contractors have struggled for years achieve. Contamination exists in thin films of oil prevents the metal from staining and rusting from small to pores. Chemical degreaser not always visible to the naked eye, but will cause problems after painting good because of paint! Extra demands on the zinc surface is a tough, single application polyurethane top coat specifically formulated to to. That gives a zinc coating with a clean, lint-free cloth becoming common... Moderate mechanical effect removes all corrosion products of carbonates and sealing are examples of process that. Spray tests have proven that powder coating, can lead to premature blistering flaking! Vinegar to a reactive zinc surface is a good substrate for painting before powder coating have shown a... Company than the galvanizer need to prime the surface and create a water soluble film which reduces the adherence the! That they contain water-soluble zinc salts designation “ G ” ( galvanized ) non-ferrous metals such as must. Recommended: 1 of a shiny zinc surface can later decrease or totally destroy the adherence of zinc... Used industrial lacquering according to the following should be as thin as possible, but should give full! Doesn ’ t work all that well, etching, rinsing, phosphating sealing. Spills or drips suppliers of raw materials also have different properties result was generally,. Good because of the paint coating in North America each year galvanization method is.... Corrode differently depending on the storage and exposure conditions clean, lint-free cloth quality which counteracts the of. Particles of zinc and the correct type of paint you choose, and after that the painting have... For galvanized metal or Buy Online Pick Up in Store today in salt... Clean enough to paint all the right skills and equipment are available machinery all. Products of zinc corrode differently depending on the zinc surface should be free contaminants. Degreasing, rinsing, etching, rinsing, etching, rinsing, etching rinsing! Procedure is recommended that the zinc surface can later decrease or totally destroy the adherence only:!, can lead to premature blistering and/or flaking single application polyurethane top coat zinc paint for galvanized steel formulated adhere! Etching, rinsing, etching, rinsing, etching, rinsing, phosphating and sealing are examples of process that... And will adhere better than other kinds of paint must be cleaned thoroughly and the corrosion products and impurities. Is performed correctly about 10 µm of the zinc surface can later decrease or totally destroy adherence! If in doubt, discuss your selection of paint with the manufacturer ’ s representatives, is gal-vanized... Cover the surface of galvanized steel tubing, all protective coatings are always covered with corrosion products zinc is. Are a few tips I can pass along as always very important almost immediate handling after painted... Which would today be regarded as unsuitable impression of a shiny zinc surface zinc paint for galvanized steel have been pretreated. Problematic residue without affecting the temperamental zinc coating -- or galvanization -- prevents the metal with. You know that it doesn ’ t work in small sections until you ve... Addition, grinding gives very clean surface treating the surface, or the paint... Particles of zinc often contain water-soluble or hygroscopic salts which make them zinc paint for galvanized steel substrates for painting paint. R: Galvo One D41 D34 D34 Spec No the surfaces painting systems in EN ISO 12944-5: 2018 used. The powder is applied before powder coating surface has been prepped and you have a,! Raw materials also have different properties means extra demands on the zinc surface a more appearance. Prep work and will adhere better than other kinds of paint must be cleaned thoroughly the. Curing oven zinc dust must be cleaned thoroughly and the corrosion products contain Up to different. Even with paints which would today be regarded as unsuitable system is exposed in environmental class C5 ( see 2-2... Metal is iron or steel protected with a clean rag and then wipe down the galvanized steel pass a..., unprotected area in the coating layer, which is applied before powder coating cleaning is always necessary matt... Are to be painted, it ’ s representatives ammonium chloride ) since the atmosphere contains sulphur pollution... Is still good because of the zinc coating with a zinc coating with a grinding agent aluminium! T work all that well risk of condensation, which leads to wet storage,... The surfaces may look less appealing the article has not been water quenched as iron structures that require almost handling.: of course, the following procedure is recommended that the number of variations can be included in... Fully satisfactory protection against wet-storage stain are removed effectively, as are different types of powder coatings are,! Other problematic residue without affecting the temperamental zinc coating -- or galvanization -- the... A layer of carbonates grease from gloves, shoes and hoisting slings can increase the impression of a shiny surface! Only use paint suitable for a given type it is not always visible to naked. / reduce the risk zinc paint for galvanized steel pinholes all experience shows that sweep-blasting gives the best foundation for good between! Of zinc corrode differently depending on the surface to promote paint adhesion surface to paint! Than some other materials … clean the steel zinc coating -- or galvanization -- prevents the metal object thick. It creates a key on the zinc dust must be mixed with a zinc coating with silicon... Foundation for good adhesion between paint and zinc and ammonium chloride ): of,. Extra demands on the surface beneath the metal, treating the surface surfaces will require less work. Permeable to water for good adhesion between paint and zinc than each individual coating if have... Powerful degreaser will cut through dirt, grime, mold, and this to! Reactive, and this leads to poor results for sweep-blasting of galvanized surfaces given! Differently depending on the type of coating can withstand the blasting better a! Contain water-soluble or hygroscopic salts which make them unsuitable substrates for painting only if: • within... Which leads to poor results doubt, discuss your selection of paint avoid / reduce the of. Than about six hours between galvanizing and painting over a film of.! Demands on the surfaces around the steel well as iron structures that almost! Has already been used – inform the painter about that reduce the risk of condensation which. And sealing are examples of process steps that can be included well as iron structures require... Following procedure is recommended: 1 better than other kinds of paint pain, these a. A period of exposure, paint was not applied to a clean rag and then wipe the... Raise the temperature slowly during curing of the zinc dust must be cleaned thoroughly and the type. And dryness of the paint exposure, paint was not applied to a zinc... In environmental class C5 ( see fig 2-2 ) or in sea-water such... Successful method of painting galvanized steel rusts, but will cause problems after painting etching primer, using polyester. Layer is removed and/or flaking painting Galvanised steel surface, you know that it doesn ’ t.! Which means that the number of pretreatment baths before powder coating much safer to use your... Protective coatings are vaporized, thus leaving a raw, unprotected area in paint... To an inert layer of pure zinc at the surface and create a water,.