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Silver film incorporating protective insoluble metallic salt precipitate

  • US 6,017,580 A
  • Filed: 08/28/1998
  • Issued: 01/25/2000
  • Est. Priority Date: 08/28/1998
  • Status: Expired due to Term
First Claim
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1. A method for making mirrors wherein the mirror comprises a glass substrate and a reflective metallic film layer on the glass substrate comprising:

  • supplying a glass substrate;

    sensitizing the glass substrate;

    coating a layer of silver on the glass substrate;

    contacting the silver coated glass substrate with an acidic solution containing a specified cation and an alkaline solution containing a specified anion, or alkaline material which forms hydroxyl ions, by spraying or otherwise directing streams of the solutions so that the two solutions meet at the silver surface, the specified cation and specified anion or hydroxyl ion being reactive to form a water insoluble precipitate on the silver surface, which precipitate enhances the corrosion resistance of the silver layer.

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