Articles having improved corrosion resistance
View Patent ↗The present application relates to a method for enhancing metal corrosion resistance of a metal deposited on a substrate, the method comprises contacting the metal coated substrate with a treating composition comprising a film forming organic component which treating composition forms a hydrophobic film on the metal coated substrate with a thickness of less than 1 μm. Furthermore, the present application relates to a method for making a mirror comprising a substrate having a metal coated thereon, the method comprises contacting the metal coated substrate with a treating composition comprising a film forming organic component which treating composition forms a hydrophobic film on the metal coated substrate with a thickness of less than 1 μm. Preferably, the film forming organic component is selected from the group consisting of an aromatic triazole compound and a silicone resin. In addition the present application relates to the products obtainable by these methods.
1. A method for making a copper-free mirror, consisting essentially of:
contacting a reflective silver metal coated substrate at a temperature of 26° C. to 32° C. with a treating composition at a liquid volume of about 100 to 300 ml/m 2 ,
wherein the treating composition is a one component system comprising a film-forming organic component comprising
a silicone resin; and
at least one aromatic triazole compound of the following general formulae:
wherein
R includes halogen; a branched or cyclic alkyl group of the formula C n H (2n+1) ; a linear, branched or cyclic alkanoyl group of the formula C n H 2n OH; a linear, branched or cyclic carboxyl group of the formula C n H 2n COOH; or a linear, branched or cyclic imino group of the formula C n H 2n NH; or SO 2 R with R as defined above; and wherein n is greater than 1 and less than or equal to 12;
R′ includes hydrogen; a linear, branched or cyclic alkyl group of the formula C n H (2n+1) ; a linear, branched or cyclic alkanoyl group of the formula C n H 2n COOH; a linear, branched or cyclic carboxyl group of the formula C n H 2n COOH; or a linear, branched or cyclic imino group of the formula C n H 2n NH; wherein n includes from 1 to 12;
M + includes Li + , Na + , K + or Rb + ;
X − includes F − , Cl − , Br − or I − ; and
the number of groups R on the benzol ring can be 1, 2, 3 or 4; and
an aqueous carrier comprising a liquid having water in about 80% by weight and a C1 to C4 alcohol or a C3 to C4 ketone as a cosolvent in no more than about 20% by weight; and
forming a single layer of a continuous hydrophobic film on the substrate with a thickness of less than 1 μm.
2. The method according to claim 1 , wherein the aromatic triazole compound comprises a mixture of at least two aromatic triazole compounds.
3. The method according to claim 1 , wherein the group R′ is selected from CH 3 , C 2 H 5 and C 3 H 7 .
4. The method according to claim 1 , wherein the silicone resin has the structural element
wherein
Y includes a group selected from OR 2 and NR 2 2 ,
R 1 includes an alkyl group with 3 to 12 carbon atoms,
R 2 includes methyl or ethyl; and
a includes 0.8 to 1.2,
b includes 0.2 to 1.2
and n includes <10000.
5. The method according to claim 1 , wherein the film forming organic component is applied to the surface of the metal deposited on a substrate in an amount about 0.1 to about 200 mg/m 2 .
6. The method according to claim 1 , wherein the substrate is a vitreous product selected from the group consisting of ceramics, glass; polymeric materials, and metal particles.
7. The method according to claim 6 , wherein the metal particles are selected from the group consisting of silver flakes and powders, metal coated mica and metal coated metal particles.
8. The method according to claim 1 , wherein the substrate is glass.