Q:What are the humidity requirements for galvanized sheets during storage?
A:Core requirements: The storage environment should be dry and ventilated, and the relative humidity (RH) should be controlled below 60% as much as possible to avoid condensation.
Risk: High humidity can easily lead to electrochemical corrosion of the zinc layer, resulting in "white rust" (zinc oxide or zinc hydroxide powder), which affects the appearance and corrosion resistance.
Measures: Use dehumidification equipment (such as air conditioners, dehumidifiers) or desiccants (such as silica gel, quicklime) to reduce humidity.
Avoid open-air storage during rainy or humid seasons, and the warehouse floor needs to be treated with moisture-proof treatment (such as laying plastic sheets, wooden boards or overhead pallets).
Q:What are the temperature requirements for galvanized sheets during storage?
A:The storage temperature should be stable, and avoid drastic temperature differences (such as large temperature differences between day and night) to prevent water vapor in the air from condensing on the surface of the sheet to form condensed water.
In winter, avoid moving galvanized sheets directly from a low-temperature environment to a high-temperature and humid environment (such as a greenhouse or heating room) to prevent condensation on the surface.
Q:Can galvanized sheets be stored in a closed environment?
A:Avoid storage in a closed, stuffy environment, especially during the hot summer months. The warehouse should be well ventilated, and doors and windows should be opened regularly or ventilation equipment should be used to reduce the risk of humid air accumulation.
Q:What are the requirements for stacking galvanized sheets?
A:Raise the bottom layer: The boards should be stored off the ground and raised by at least 10-20 cm with wooden pallets, plastic pads or metal brackets to avoid direct erosion by ground moisture.
Single stack width limit: The width of a single stack should not be too large (usually not more than 2 meters) to ensure uniform ventilation; a 30-50 cm passage should be left between stacks for ventilation and inspection.
Stacking height: The number of stacking layers should be controlled according to the thickness and load-bearing capacity of the boards. The stacking height of thin boards (such as ≤0.8mm) generally does not exceed 1.5 meters. Thick boards can be appropriately increased, but the bottom board should be prevented from being compressed and deformed.
Q:What should we pay attention to when transporting galvanized sheets?
A:Use special lifting equipment or suction cups to carry the plate smoothly to avoid bending, collision or surface scratches.
The coils should be stored upright (axially perpendicular to the ground) to avoid flat stacking that may cause deformation of the coil core or wear of the coating.