The hot-dip galvanized coating is an intermetallic 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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Hi Ajeet,
The effects of steel chemistry and steel thickness on the galvanized coating thickness are independent of surface area.  For thicker steel, a longer immersion time in the zinc bath is typically required to heat the steel and form the galvanized coating.  Because a longer immersion time in the zinc bath results in thicker coatings, an increase in steel thickness will tend to increase the coating thickness.

ajeet gupta

Dear Sir,
how can it be possible if the surface area for coating for thiner or thicker material will be same.

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