Causes of whitening on the surface of galvanized steel strip If a layer of condensed water is adhered to the surface of the galvanized layer, it reacts with oxygen, carbon dioxide, hydrocarbons, sulfur dioxide, soot, dust and other chemical gases to become a corrosive aqueous solution and adheres to the surface of the galvanized layer. To form an electrolyte. This electrolyte undergoes electrochemical corrosion with a zinc layer with poor chemical stability, resulting in a powdery corrosion product
The main reasons for the white rust zinc layer to corrode indoors are: 1. high indoor air humidity; 2. the finished product is not dried and the warehouse; 3. the surface of the zinc layer is condensed with a water film, when the moisture content in the air reaches 60% or In the range of 85 ~ 95%, and PH <6, the corrosion reaction is more severe. When the water temperature is up to about 70 ℃, the fastest way to corrode the zinc layer is to prevent white rust: 1. When the zinc plates are stacked, there should be no condensation on the surface; 2. The air should be kept in the warehouse and the relative humidity of the air should not be It should be in the range of 60% or 85 ~ 95%; 3. Zinc plates should be stacked without harmful gases and excessive dust; 4. The surface of the galvanized layer should be oiled and passivated.
Comments