0.8mm Cold Rolled Galvanized Iron Steel Coil Metal

Why does galvanized steel GI appear white rust and black spots?

8 Reasons for galvanized steel GI white rust and black spots

1. Poor passivation, insufficient uniformity of the thickness of the toughened film

2) The surface is not coated with oil

3) Residual moisture on the strip surface

4) Passivation is not complete Drying

5) Moisture or rain in transportation or storage

6)The finished product is stored for a long time

7) Galvanized sheet and other acids and alkalis and other corrosive media contact or storage together

8) White embroidery may evolve into black spots, but the black spots are not necessarily caused only by white embroidery, such as friction black spots.

0.8mm cold rolled galvanized iron steel coil metal specification

Galvanized Steel Coil Description

Hot Dipped Galvanized Steel Sheet in Coil (GI) is produced by passing the Full Hard sheet which has undergone the acid washing process and rolling process through the zinc pot, thereby applying zinc film to the surface. It has excellent corrosion resistance, paintability, and workability due to Zinc's characteristics. Usually, hot-dipped galvanized steel sheet and galvanized steel coil processes and specifications are the same.
Hot-dip galvanizing is the process of applying a protective zinc coating to a steel sheet or iron sheet, to prevent rusting.
* Excellent anti-corrosion, paintability, and processability due to the self-sacrificing characteristic of zinc.
* Available to select and produce the desired amount of zinc gilded and in particular enables thick zinc layers(maximum 120g/m2).
* Classified as either zero spangle or extra

FAQ

1. who are we?
We are based in Shandong, China, starting from 2021, selling to Eastern Asia(40.00%), Southeast Asia(20.00%), Northern Europe(20.00%), South Asia(15.00%), and Africa(5.00%). There are a total of about 5-10 people in our office.

2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;

3. what can you buy from us?
steel sheet, steel coil,PPGI steel sheet, PPGI steel coil, galvanized steel coil

4. why should you buy from us not from other suppliers?
large storage, with competitive prices, fast delivery

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