First, the galvalume steel plate consists of 55% aluminum, 43.5% zinc and a few of other elements.Galvanized sheet is made of ordinary iron plate surface plated with a layer of zinc, its main component is iron.
Second, in the humid and rainy city, as long as there’s a certain point corrosion, the corrosion will be bigger and bigger and finally gradually spread to the whole galvalume steel plate. While a certain point of corrosion on galvanized sheet will not spread.
Third, on the surface of the galvalume plate, there are many honeycomb structures, and the nests made of aluminum are coated with zinc, which acts as an anode protection. Because zinc material wrapped by aluminum is not easy to electrolyze, the protective effect of the anode is greatly reduced. Therefore if the galvalume steel plate is cut, it will rust quickly. So the galvalume steel plate should be cut as little as possible. The structure of galvanized sheet, by contrast, is simple: just a smooth layer of zinc protects the steel from external damage and slows corrosion.
Therefore, galvanized plate and galvalume plate both have advantages and disadvantages, what suits you is the best. If you need galvalume steel or galvanized steel,please feel free to send us an inquiry at anytime.According to your use and needs,ZEBRA STEEL can customize the best procurement program for you. You can buy the steel materials you want with the lowest cost and the best quality service.