Elimination of film defects due to hydrogen evolution during cat

Details Elimination of film defects due to hydrogen evolution during cat Elimination of film defects due to hydrogen evolution during cat

1990-09-20

1991-11-19

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041806, 2041816, C25D 1310

Patent

active

050663747

ABSTRACT:
This invention is directed to a method for eliminating or reducing pinhole defects in cataphoretically deposited films without interfering with the electrolysis of water needed for electrodeposition. This method comprises decreasing the evolution of hydrogen gas at the cathode by adding a compound to the emulsion. This compound is reduced by the hydrogen produced at the cathode during the electrodeposition. The hydrogen reacts with the this non-gaseous compound rather than becoming hydrogen gas and forming bubbles which lead to pinhole defects.

REFERENCES:
patent: 4108817 (1978-08-01), Lochel
patent: 4592816 (1986-06-01), Emmons et al.
patent: 4877818 (1989-10-01), Emmons et al.

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