Mechanism of Cathodic Electrocoat Primer Cratering Research Dept. Bethlehem Steel Corporation Bethlehem, PA

Format:

Conference/Event

Author/Creator:

Hart, R.G., author.

Conference Name:

SAE Automotive Corrosion and Prevention Conference and Exposition (1983-12-05 : Dearborn, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1983

Summary:

Cathodic electrocoat primers (cathodic e-coat) have been widely adopted by the automobile industry. One drawback to these coatings is that they display a tendency for formation of crater-like features when applied to zinc-rich surfaces under typical automotive application conditions.Our studies show that cratering susceptibility is an inherent property of zinc and that the craters result from localized dielectric breakdown of the e-coat film during deposition. Energy from the electric discharges displaces the e-coat at the discharge sites and locally cures the adjacent e-coat. During cure-baking, the locally cured e-coat does not re-flow to fill the voids created by the discharges, resulting in crater-like features in the cured e-coat film

Notes:

Vendor supplied data

Publisher Number:

831818

Access Restriction:

Restricted for use by site license