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HaiGang Yunyi
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Tianjin Haigang Steel Coil
Service first, quality assured. More dedicated and focused on crafting even better boards.
21
2020
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05
The difference between electro-galvanizing and hot-dip galvanizing
Steel is highly susceptible to corrosion when exposed to air, water, or soil. Annual losses due to corrosion account for roughly one-tenth of total steel production. To impart specific functional properties to metal surfaces and give them an aesthetically pleasing appearance, electroplating with zinc is commonly employed. Since zinc does not readily change under either dry or humid atmospheric conditions, it forms a highly dense film of zinc oxide on the surface, which effectively protects the underlying metal from corrosion. Moreover, if the coating is damaged for some reason and exposes the base metal, the zinc and steel substrate form micro-pores, turning the base metal into a cathode and providing it with additional protection. This process is widely used in industries such as automotive and transportation; however, to reduce the harmful and toxic effects of hexavalent chromium passivation, trivalent chromium conversion coatings and zinc-nickel alloy platings are often required. Electroplated zinc coatings are thick, have fine and uniform crystal structures, are free of pores, and exhibit excellent corrosion resistance. The zinc layer obtained through electroplating is relatively pure, corroding slowly even in acidic or alkaline fumes, thereby effectively protecting the metal substrate. After chromate passivation, the galvanized layer can develop various colors, including white, colored shades, and military green. These coatings are visually appealing and possess a certain decorative quality. Due to the excellent ductility of the zinc layer, it can be shaped through cold stamping, rolling, bending, and other processes without damaging the coating. Electroplated zinc is increasingly being applied in a growing number of fields. Fastener products have become widely used in sectors of great economic significance, such as mechanical engineering, electronics, precision instruments, chemical industry, transportation, aerospace, and others. Among the hot-dip galvanizing methods used for surface protection of various substrates, hot-dip galvanizing stands out as an exceptionally effective technique. In hot-dip galvanizing, the zinc used is in liquid form; after undergoing complex physical and chemical reactions, this method not only deposits a thicker zinc layer onto steel fasteners but also creates a zinc-iron alloy layer. This galvanizing method not only shares the corrosion-resistant characteristics of electroplated zinc but, thanks to its zinc-iron alloy layer, offers superior corrosion resistance that cannot be matched by electroplating alone. Consequently, this galvanizing method is particularly well-suited for use in environments characterized by severe corrosion, such as those exposed to strong acids and strong alkalis. This type of metal is extensively utilized in the construction of power transmission towers. In principle, the hot-dip zinc coating is formed in three distinct steps: First, the iron-based surface is dissolved by the molten zinc, creating a zinc-iron intermetallic layer; next, zinc ions from the alloy layer further diffuse into the substrate, forming a zinc-iron mixed-layer; finally, the surface of the alloy layer is covered by a zinc layer.
Tianjin Haigang Steel Coil Co., Ltd., Galvanized Strip Steel, Galvanized Steel Strip, Galvanized Strip, Galvanized Coil Sheet, Galvanized Steel Sheet
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We primarily produce various products including galvanized strip steel, pickled strip steel, and cold-rolled strip steel. These products are widely used in industries such as construction, mechanical manufacturing, automotive, and household appliances.
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Shuangtang High-end Hardware Products Industrial Park, Jinghai District, Tianjin City
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tjhaigang@tjhaigang.com
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