What is Galvanized or Zinc Coated?
DOWNLOAD
Surface Condition:
1. Due to the different treatment methods in the coating process, the surface of the galvanized sheet is also different, such as ordinary spangles, fine spangles, flat spangles, zinc-free spangles, and phosphate-treated surfaces. German standards also provide for surface grades.
2. The galvanized sheet should have a good appearance, and there must be no defects that are harmful to the use of the product, such as no plating, holes, cracks, and scum, excessive plating thickness, scratches, chromic acid dirt, white rust, etc. Foreign standards are not very clear on specific appearance defects, and some specific defects should be listed in the contract when ordering.
Through decades of experience accumulation, Sigma Steel has discovered that galvanized sheets are prone to some quality problems, especially white rust. The reasons are summarized as follows:
1. Poor passivation, insufficient or uneven passivation film thickness.
2. The surface is not oiled or there is residual moisture on the surface of the steel strip.
3. The surface of the steel strip contains moisture during coiling.
4. The passivation is not completely dried.
5. Moisture or rain during transportation or storage.
6. The finished product has been stored for too long.
7. The galvanized sheet is in contact with other corrosive media such as acid and alkali or stored together.
Sigma Steel can perfectly avoid the above problems in the production and transportation process to maximize the quality of the goods.
Above are brief explanations of galvanized steel, Sigma Steel will be your trusted business partner.
