Reflective articles and methods of manufacturing same

• US 5,374,451 A
• Filed: 08/19/1993
• Issued: 12/20/1994
• Est. Priority Date: 11/03/1990
• Status: Expired due to Term

• Current Assignee: Glaverbel
• Original Assignee: Glaverbel
• Inventors: Somerhausen, Bernard, Dauby, Christian, Servais, Albert
• Primary Examiner(s): BELL, JANYCE A
• Application Number:
  US08/108,446
• Time in Patent Office: 488 Days
• Field of Search: 427/165, 427/343, 427/404, 427/407.2, 427/250
• US Class Current: 427/165
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3605 Coatings of the type glass/metal/inorganic compound
• CPC Class Codes: C03C 17/3644 the metal being silver
• CPC Class Codes: C03C 17/3652 the coating stack containing at least one sacrificial layer to protect the metal from oxidation
• CPC Class Codes: C03C 17/366 Low-emissivity or solar control coatings
• CPC Class Codes: C03C 17/3663 specially adapted for use as mirrors
• CPC Class Codes: Y10T 428/31678 Of metal

Abstract

A reflective article such as a mirror or an energy-screening transparent panel comprises a reflective metal coating deposited on a glass substrate. The metal coating comprises a reflective layer of silver and has been treated with a solution containing ions of at least one of the group consisting of: Cr (II); V (II or III); Ti (III or II); Fe (II); In (I or II); Cu (I); and Al (III). Such a treatment affords protection of the reflective coating against corrosion.

Claims

1. A method of manufacturing a reflective article comprising a reflective metal coating deposited on a glass substrate, the method comprising the steps of, in the order recited:

(a) forming a metal coating comprising a reflective layer of silver on a surface of the glass substrate;

(b) rinsing the metal coating;

(c) contacting the metal coating with an aqueous treatment solution containing ions of at least one metal selected from the group consisting of Cr(II);

V(II or III);

Ti(III or II);

Fe(II);

In(I or II);

Cu(I); and

Al(III); and

(d) washing and drying the thus treated metal coating.

2. The method according to claim 1, wherein the glass substrate is a glass sheet, and wherein the metal coating is deposited onto the glass sheet as an opaque coating to form a mirror.

3. The method according to claim 2, wherein said metal coating is coated with a protective layer of paint.

4. The method according to claim 3, wherein said metal coating is contacted with a silane before painting.

5. The method according to claim 3, wherein said paint is substantially lead-free.

6. The method according to claim 1, wherein a surface of the substrate is sensitized, and wherein said metal coating is formed by being deposited onto the sensitized surface of the substrate using at least one metallizing solution.

7. The method according to claim 6, wherein the freshly formed metal coating is rinsed and then contacted with said aqueous treatment solution while still wet.

8. The method according to claim 1, wherein said aqueous treatment solution is an aqueous solution of one of a chloride or a sulfate.

9. The method according to claim 1, wherein said aqueous treatment solution additionally contains ions of Sn(II).

10. The method according to claim 1, wherein said metal coating is formed by depositing a reflective layer of silver which constitutes said metal coating.

11. The method according to claim 1, wherein said metal coating is formed by depositing a reflective layer of silver and overcoating the silver layer with a thin film of copper.

12. A method of manufacturing a reflective article comprising a reflective metal coating deposited on a glass substrate, the method comprising the steps of:

(a) forming a metal coating comprising a reflective layer of silver on a surface of the glass substrate;

(b) contacting the metal coating with an aqueous treatment solution containing ions of at least one metal selected from the group consisting of Cr(II);

V(II or III);

Ti(III or II);

Fe(II);

In(I or II);

Cu(I); and

Al(III); and

(c) washing and drying the thus treated metal coating,

wherein the glass substrate is a glass sheet, and wherein the metal coating is deposited onto the glass sheet as a transparent coating, and the metal coated glass sheet is held in spaced relation from at least one other glass sheet to form a hollow glazing unit, the metal coating being located inside the glazing unit.

13. A method of manufacturing a reflective article comprising a reflective metal coating deposited on a glass substrate, the method comprising the steps of:

(a) forming a metal coating comprising a reflective layer of silver on a surface of the glass substrate;

(b) contacting the metal coating with an aqueous treatment solution containing ions of at least one metal selected from the group consisting of Cr(II);

V(II or III);

Ti(III or II);

Fe(II);

In(I or II);

Cu(I); and

Al(III); and

(c) washing and drying the thus treated metal coating,

wherein said metal coating is formed by being deposited by vacuum deposition.