Galvanized sheets refer to steel sheets with a galvanized coating on the surface. According to the surface condition, galvannealed steel sheet can be divided into ordinary zinc flowers, fine zinc flowers, flat zinc flowers, no zinc flowers, and phosphating treatments.
The minimum thickness of gi sheet coating is 0.35mm
Common coating thicknesses of galvanized metal sheets include 0.35mm, 0.40mm, 0.45mm and other specifications.
The thickness of the coating is related to the surface protection process of the galvanized layer.
The coating process is usually divided into electro-galvanizing and hot-dip galvanizing:
Electro-galvanizing uses electroionic solution decomposition technology to attract and attach zinc ions to the surface of the steel to form a thin zinc layer. The standard requirement for electro-galvanizing zinc layer thickness is greater than or equal to 12 microns;
Hot-dip galvanizing uses metal dissolution reaction technology to chemically react between zinc metal molecules and steel metal molecules to form a thicker alloy zinc layer. The standard requirement for hot-dip galvanizing zinc layer thickness is greater than or equal to 65 microns.
Galvanised sheets generally use the electro-galvanizing process, and the surface is relatively flat and smooth. The plates purchased by cable tray manufacturers to make galvanized trays must comply with the above standards.
Coating thickness testing mainly detects the thickness of metal coating and surface oxide layer on the surface of steel plates.
The coating thickness testing methods mainly include metallographic observation method, industrial X-ray scanning detection method, scanning electron microscope SEM observation and other methods.
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