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Shanghai AIYIA Industrial Co., Ltd.

Professional Metal Material Manufacturer in China

  • Home
  • Enterprise Profile
  • Products
    • Galvanized Steel
      • Galvanized Steel Coil
        • DX51D Gi Coil
      • Electro Galvanized Steel
      • Galvannealed Steel Coil
      • Galvalume Steel Coil
      • PPGI & PPGL
    • Stainless Steel
      • Stainless Steel Coil
      • Stainless Steel Sheet
      • Stainless Steel Disc
      • Stainless Steel Pipe
    • Tin Mill Steel
      • Tinplate
      • Tin Free Steel(TFS)
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      • Aluminum Cable
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Quality Defects and Precautions of Galvanized Sheet


Common quality defects of galvanized sheet

Defect nameDefect performanceCause
Galvanized peelingDezincificationPoor furnace temperature, improper substrate processing, etc.
Not galvanizedPart of the steel plate surface is not galvanizedpoor raw materials, poor pre-treatment degreasing, poor furnace temperature
Bad spangleUneven spangle size, no spanglePoor heating in the furnace area and poor cooling control
Zinc scarPoint and granular zinc dross attached to the surface of the steel plateThe scum or bottom dross in the zinc pot adheres to the steel belt
OxidationWhite rustDuring storage, it absorbs moisture in the air and oxidizes.
2Zn+O2 → 2ZnO
5ZnO+2CO2+3H2O
→2ZnCO3·3Zn(OH)2
Dark SpotBlack dots, blocky spotsImpurity precipitation reacts with moisture and carbon dioxide in the atmosphere, or friction during transportation.
WaveWavy edges or middlePoor raw material or poor working condition of the pull-straightening roller.
Jagged edgeJagged edgesWhen the raw material is cold rolled, the edges are uneven and jagged.
Uneven surfaceDentPits in the raw material or adhesion of foreign matter on the surface of the roller

Matters needing attention in the transportation and storage of galvanized coils

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.


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