Steel plant, steel bridge, TV tower, building antenna to send substation, steel poles and other outdoor steel, these steel components of long-term exposure to the atmosphere, by climate change and the sun and rain, the surface oxidizes rapidly, generate a layer of iron oxide, seriously affecting the steel strength and service life. In order to prevent oxidation of the steel surface, in the past generally used paint protection, 32 beam, its anti-corrosion life is generally 3-5 years, q345d beam, and therefore require frequent maintenance, maintenance, common method is to copy the shovel paint, spend a lot of manpower and resources. Now using steel surface spray zinc, aluminum spray process to protect, Hefei beam, anti-corrosion life of up to 30 years without maintenance. As the zinc aluminum outer coating plus paint closed, the anti-corrosion life longer. US Steel Union law: it is a variant of Sendzimir law, it is only the use of an alkaline degreasing tank replace electrolytic oxidation furnace degreasing effect, q235 beam, substantially the same as the rest of the process and Sendzimir. After the original plate into the operating line, the first electrolytic degreasing, then washed, dried, and then through the protective gas reduction furnace recrystallization annealing, and finally into the hot dip galvanized zinc pot in a sealed case. This method is not oxidized because of the strip heating furnace, so the surface of the thin oxide film, the reduction furnace can be appropriately reduced hydrogen content in the protective gas. Thus, for furnace favorable safety and reduce production costs. However, due to the lack of pre-heating the strip to enter the reduction furnace, so no doubt improve the heat load reduction furnace, affect the life of the furnace. Therefore, this method does not have a wide range of applications. Hefei beam _ exhibition of Commerce Bo _q345c beam provided by the Hefei exhibition Bo Trading Company. Hefei beam _ exhibition of Commerce Bo _q345c beam Hefei Show Bo Trading Company (www.hfzhanbo.com) (www.hfzhanbo.com) this year introduced a new upgrade, the above picture is for reference only, please dial this Tel pages or pictures on obtain the latest information, contact: Mr. Huang.