What are the protective principles of outer zinc in China Galvanized Steel Roofing Sheet for sale? Chemical house corrosion is a direct chemical reaction between the metal and surrounding dielectrics. For example, the chemical action of dry gas (absolutely water-free) and non-conductive liquid medium (non-electrolyte) on zinc is called typical chemical corrosion. Wave Type Galvanized Corrugated Steel Sheet is mainly used outdoors, and its corrosion environment is relatively poor, so it requires a thicker slope. In addition, the zinc coating belongs to the anode protection, the uneven coating is not a problem, the thicker the ship layer, the longer the service life, the characteristics of hot money zinc just can meet these requirements. The electroplated zinc coating is uniform, firmly combined with the weight, well and less surface subsidence, but the thickness of the coating is thin, only one fifth to one-seventh of the thickness of the hot zinc coating. If the thickness of the zinc coating on the slope is increased, not only the power consumption is high, but also the residence time in the electrolyte needs to be increased, so the equipment should be increased accordingly. The thickness of the zinc coat is generally about 18 g/m, so its application range is limited by thorium. Moreover, its production cost is high and its production is low. Its production capacity in the world is only about one-seventh of that of hot zinc. Although the production of electrolytic zinc is increasing continuously, it is not a strong rival to the development of thermal zinc.