Why does the galvanized coating thickness depend on the steel thickness?
The hot-dip galvanized coating is an inter-metallic layer of iron and zinc, meaning the zinc and iron react and diffuse into one another to create the galvanized coating. If more iron is available to react with the zinc, a thicker coating can develop. Thicker pieces of steel tend to develop thicker galvanized coatings. Steel chemistry also plays a huge role in zinc coating thickness, with silicon and phosphorus being the primary catalysts of the galvanizing reaction. Steel chemistry and thickness have the biggest effect on the galvanized coating thickness.
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Brahampuri Steels Ltd
Dear sir, We are an iron and steel industry mainly fabrication and galvanization of steel. We have been continuously observing that even when the temperature of the Zinc Bath is increased (From 420 to 465 degree Celsius), Materials with thickness up to 3 mm exhibit a higher Zinc Micron coating than they should (100 microns). The plant is a hot dip galvanization plant. We are unable to understand this and maintain the coating to 85 microns for thinner material (1.5 mm - 3 mm). What can be the possible reasons?