BORDIGNON GROUP COMPANY PROFILE PLANTS NEWS CONTACT English Română Italiano Hot-Dip Galvanizing Service Steel protection expertise Number that make a difference. 30 tons: we are able to galvanize large structure, up to 30 tons weight 19 metres: our galvanizing kettle is the biggest in Europe, allowing us to deep pieces up to 19 metres of length. Each stage of the production process is carefully controlled right up to the conformity declaration. Many years of experience and acquired skills provides an efficient and comprehensive service. Hot-dip galvanizing process Pretreatment Surface preparation for galvanizing consists of three steps: Degreasing: a hot alkali solution removes organic contaminants such as paint markings, grease, and oil from the metal surface. Epoxies, vinyls, asphalt, or welding slag, which cannot be removed by degreasing, must be removed before galvanizing by grit-blasting, sand-blasting, or other mechanical means. Pickling: a dilute solution of heated hydrochloric acid removes mill scale and iron oxides (rust) from the steel surface. Fluxing: the final surface preparation step in the galvanizing process, an ammonium chloride solution, serves two purposes. It removes any remaining oxides and deposits a protective layer on the steel to prevent any further oxides from forming on the surface prior to immersion in the molten zinc. Surface preparation is a critical step in the application of any coating. Galvanizing During the true galvanizing step of the process, the material is completely immersed in a bath of molten zinc. The bath chemistry requires at least 98% pure zinc maintained at 450° C. While immersed in the kettle, the zinc reacts with the iron in the steel to form a series of metallurgically bonded zinc-iron intermetallic alloy layers, commonly topped by a layer of impact-resistant pure zinc. Once the fabricated items coating growth is complete, it is withdrawn slowly from the galvanizing bath, and the excess zinc is removed by draining, vibrating, and/or centrifuging. The metallurgical reaction will continue after the materials are withdrawn from the bath, as long as it remains near bath temperature. Inspection The inspection of hot-dip galvanized steel is simple and quick. The two properties of the hot-dip galvanized coating most closely scrutinized are coating thickness and appearance/surface condition. A variety of simple physical tests can be performed to determine thickness, uniformity, adherence, and appearance. Durability – The uses of hot-dip galvanized steel continue to evolve, and new markets are emerging all the time. – Similarly, the decision to galvanize has matured beyond the customary corrosion protection to an array of other reasons. – Though corrosion resistance is inherent any time HDG is utilized, more and more specifiers select hot-dip galvanized steel for other reasons including lowest initial cost, durability, longevity, availability, versatility, sustainability, and aesthetics. Environmental and Economic Advantages: UNI EN ISO 1461:2009 Standard: FAQ: ZINCHERIA VALBRENTA ZINCHERIA SECA ZINCHERIA S.A. DMW LOGISTICS Zincheria B&B Seguici su Social Newsletter Iscriviti News Il Nuovo Ponte di Genova: zincato a caldo 350 tonnellate di acciaio Lakhta Center di San Pietroburgo: un edificio da Guinnes World Record Ponte di Buffalo Greek, Time Laps dei lavori di realizzazione Bordignon Group Video Player 00:00 00:00 Cookie policy © 2021 Bordignon Giuseppe S.P.A. All right reserved Informativa Noi e terze parti selezionate utilizziamo cookie o tecnologie simili per finalità tecniche e, con il tuo consenso, anche per altre finalità come specificato nella cookie policy. Puoi acconsentire all’utilizzo di tali tecnologie chiudendo questa informativa. Scopri di più e personalizza Accetta ×