Metal substrate of improved surface morphology

Details Metal substrate of improved surface morphology Metal substrate of improved surface morphology

C - Chemistry, Metallurgy

25

B

149/13, 204/195,

C25B 11/02 (2006.01) B05D 3/10 (2006.01) C23C 4/02 (2006.01) C23C 4/06 (2006.01) C23C 8/02 (2006.01) C23C 26/00 (2006.01) C23C 28/00 (2006.01) C23F 1/00 (2006.01) C23F 1/26 (2006.01) C23F 1/38 (2006.01) C25B 11/00 (2006.01) C25C 7/02 (2006.01) C25D 3/02 (2006.01) C25D 17/10 (2006.01) C25D 17/12 (2006.01)

Patent

CA 2018670

METAL SUBSTRATE OF IMPROVED SURFACE MORPHOLOGY Abstract of the Disclosure A metal surface is now described having enhanced adhesion of subsequently applied coatings. The substrate metal of the article, such as a valve metal as represented by titanium, is provided with a highly desirable surface characteristic for subsequent coating application. This can be initiated by selection of a metal of desirable metallurgy and heat history, including prior heat treatment to provide surface grain boundaries which may be most readily etched. In subsequent etching operation, the surface is made to exhibit well defined, three dimensional grains with deep grain boundaries. Subsequently applied coatings, by penetrating into the etched intergranular valleys, are desirably locked onto the metal substrate surface and provide enhanced lifetime even in rugged commercial environments.

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