|Common quality defects of galvanized sheet
|Poor furnace temperature, improper substrate processing, etc.
|Part of the steel plate surface is not galvanized
|poor raw materials, poor pre-treatment degreasing, poor furnace temperature
|Uneven spangle size, no spangle
|Poor heating in the furnace area and poor cooling control
|Point and granular zinc dross attached to the surface of the steel plate
|The scum or bottom dross in the zinc pot adheres to the steel belt
|During storage, it absorbs moisture in the air and oxidizes.
|2Zn+O2 → 2ZnO
|Black dots, blocky spots
|Impurity precipitation reacts with moisture and carbon dioxide in the atmosphere, or friction during transportation.
|Wavy edges or middle
|Poor raw material or poor working condition of the pull-straightening roller.
|When the raw material is cold rolled, the edges are uneven and jagged.
|Pits in the raw material or adhesion of foreign matter on the surface of the roller
1.Choose a ventilated place in the house to avoid dew erosion or moisture penetration;
2.Make sure that the packaging paper is not damaged during storage;
3.Shorten the storage time as much as possible and protect its surface before corrosion;
4.If the plate is subjected to abnormal external pressure, the zinc layer will partly fall off;
5.Prevent dirt and oil powder from sticking to the surface, which will affect the galvanizing effect;
6.Skids or support frames should be added under the steel coils, and the number of stacked layers should not exceed two;
7.The rain cloth should be covered during transportation, and it must be cushioned with skids and rubber, and fixed with ropes.