Using electrical discharge surface preparation for thermal coati

Details Using electrical discharge surface preparation for thermal coati Using electrical discharge surface preparation for thermal coati

1994-09-28

1997-07-15

Bareford, Katherine A.

Coating processes

Pretreatment, per se, or post-treatment, per se

427456, 219 6914, 219 6916, 219 6917, 219 6918, B05D 314

Patent

active

056481225

ABSTRACT:
A method of preparing the surface of a conductive metal to be non-smooth and non-passivated for reception of thermal sprayed coatings. The method comprises melting and rapidly solidifying globules of the surface by electrical discharge by bring an electrode (anode) in close gap-sparking proximity to the surface, filling the gap with an electrolyte containing a halogenated hydrocarbon fluid present in an amount of 2-5% of the electrolyte, and imposing a pulsed DC voltage (i.e. 20-100 volts at 40-200 amps) on the electrode to provide cyclical sparking between the electrode and the surface through the electrolyte resulting in a breakdown of the hydrocarbon to release nascent halogen atoms which attack the surface to prevent passivation during melting and solidification of the globules. The electrolyte is preferably cooled to a temperature below 65.degree. F. during the sparking, and the halogenated hydrocarbon is preferably present in a sufficient amount to attack silicon and aluminum, if such surface is an aluminum alloy containing silicon.

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patent: 4735678 (1988-04-01), Mandigo et al.
patent: 5358753 (1994-10-01), Rao et al.

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