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Why is coating thickness easier to control during electrogalvanizing?

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A labeled diagram of the periodic table entry for zinc, showing its atomic number 30, symbol Zn, atomic weight 65.38, electron configuration, name, hexagonal crystal structure, solid state at room temperature, and classification as a transition metal.
zinc

In electrolytic galvanizing, coating thickness is easier to control than in hot-dip processes because of the precise relationship between the electric current applied and the amount of zinc deposited on the surface.1

Because zinc cations are converted into solid zinc atoms through the application of direct current, the process follows a predictable electrochemical principle: theoretically, 1.22 kilograms of zinc are formed by applying a current of 1,000 amperes over one hour. Consequently, operators can manage the coating thickness by adjusting specific, measurable parameters, primarily the current density between the anodes and the strip, the line voltage, the electrolyte's chemical composition and temperature, and the speed of the production line. This allows for highly consistent and easily adjustable results compared to the mechanical wiping methods used in hot-dip galvanizing.1