Silver film incorporating protective insoluble metallic salt pre

Details Silver film incorporating protective insoluble metallic salt pre Silver film incorporating protective insoluble metallic salt pre

1998-08-28

2000-01-25

Beck, Shrive

Coating processes

Optical element produced

427165, 427168, 423DIG8, B05D 506, B05D 500

Patent

active

06017580&

ABSTRACT:
A method is provided for making mirrors having enhanced reflective layer resistance to corrosion. The reflective layer of the mirror, typically silver, is contacted, preferably simultaneously, with a first solution containing a specific cation and a second solution containing a specific anion, or alkaline material which forms hydroxyl ions, the specific cation and specific anion or hydroxyl ion reacting to form a water insoluble precipitate on the silver surface. The mirror may then be painted to provide additional corrosion resistance to the mirror. The method eliminates the need for a copper layer on the silver surface and the method may be incorporated into existing mirror production lines as a replacement for the copper layering step. Also provided are an apparatus for making the mirrors and the mirrors made using the method and apparatus of the invention. A preferred cation containing solution contains tin (e.g., SnCl.sub.2) and a preferred anion containing solution contains hydroxyl ions (e.g., NaOH).

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patent: 5374451 (1994-12-01), Servais et al.
patent: 5419926 (1995-05-01), Soltys
patent: 5487779 (1996-01-01), Sinko

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