Method of selective electroplating and products produced thereby
Preparation and use of electrodes in the electrolysis of alkali halides Patent #: 4572770
ApplicationNo. 132975 filed on 10/07/1993
US Classes:205/532, Laminated or coated205/554, Sulfur containing compound produced205/630Utilizing specified electrode
ExaminersPrimary: Gorgos, Kathryn
Attorney, Agent or Firm
International ClassesC25B 001/04
AbstractA 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.