Method of controlling the thickness of an electrodeposited...

C - Chemistry – Metallurgy – 25 – D

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204/97.07

C25D 13/00 (2006.01) C25D 13/22 (2006.01) G01B 7/06 (2006.01) G01N 27/42 (2006.01)

Patent

CA 1200527

ABSTRACT OF THE DISCLOSURE The usual method of controlling the thickness of an electrodeposited coating is to prevent the pH, the resistivity, and the temperature of the electrodeposition paint from varying by the use of regulating devices. In the method of thickness control according to the present invention, these three factors are not regulated but are per- mitted to vary freely over an allowable range. The electro- deposited charge necessary to produce a desired weight of coating is computed for the present bath conditions, and this electrodeposited charge is then obtained by regulating the electrodeposition current. This method of thickness control obviates the expensive pH, resistivity, and tempera- ture control devices required in the usual method, and is thus very economical.

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