Decorative article having white coating and method for manufacture thereof

A personal ornament having as an outermost layer a white ornamental coating film composed of platinum or a platinum alloy formed by dry-plating, comprising

• an ornament base article made of a metal or a ceramic,
• an underlayer formed on the surface on the base article,
• an abrasion resistant layer formed on the surface of the underlayer by dry-plating, and
• an ornamental coating layer composed of platinum or platinum alloy formed on the surface of the abrasion resistant layer by dry-plating,
• wherein the abrasion resistant layer has a thickness of 0.5-1.0 μm, the ornamental coating layer is a white coating film having a thickness of 0.03-0.06 μm, and at least one additional coloring coating film having a monolayer structure, a two-layer structure or a three-layer structure and having a color different from the color of the ornamental coating layer is formed on a part of the surface of the ornamental coating layer by dry-plating or wet-plating.

A personal ornament having

• a coloring layer comprising an abrasion-resistant layer, a mixture layer and an outermost layer in this order, said outermost layer being a white hard coating film composed of a noble metal or a noble metal alloy, and being formed by dry-plating on the surface of said mixture,
• wherein said noble metal or a noble metal alloy of the outermost layer of coloring layer is selected from the group consisting of platinum (Pt), palladium (Pd), rhodium (Rh), and alloys thereof, the thickness of the outermost layer is 0.005 to 0.01 μm and wherein the coloring layer has a surface hardness (HV;
• Vickers hardness tester, load:
• 5 g, retention time:
• 10 seconds) of 700-2000.

A personal ornament having as an outermost layer a white ornamental coating film composed of platinum or a platinum alloy formed by dry-plating, comprising

• an ornament base article made of a metal or a ceramic,
• an underlayer formed on the surface of the base article,
• an abrasion resistant layer formed on the surface of the underlayer by dry-plating,
• a mixture layer formed on the surface of the abrasion resistant layer by dry-plating, and
• an ornamental coating layer as an outermost layer being a white hard coating film composed of platinum or platinum alloy formed on the surface of the mixture layer by dry-plating,
• wherein the abrasion resistant layer has a thickness of 0.5-1.0 μm, the ornamental coating layer has a thickness of 0.03-0.06 μm, and wherein a surface layer comprising the abrasion resistant layer, the mixture layer and the ornamental coating layer has a surface hardness (Hv;
• Vickers hardness micro-tester, load:
• 5 g) of 1000-2000.

A personal ornament having as an outermost layer a white ornamental coating film composed of platinum or a platinum alloy formed by dry-plating, comprising

• (a) an ornament base article made of a metal or a ceramic,
• (b) an underlayer formed on the surface of the base article, wherein the underlayer is constituted of:
• (1) a nickel coating film of 1-10 μm thick formed on the surface of the ornament base article made of copper or a copper alloy by wet-plating, and
• (2) an amorphous nickel-phosphorus alloy coating film of 3-10 μm thick formed on the surface of the nickel coating film by wet-plating,
• (c) an abrasion resistant layer formed on the surface of the underlayer by dry-plating,
• (d) a mixture layer formed on the surface of the abrasion resistant layer by dry-plating, and
• (e) an ornamental coating layer as an outermost layer being a white hard coating film composed of platinum or platinum alloy formed on the surface of the mixture layer by dry-plating, wherein the abrasion resistant layer has a thickness of 0.5-1.0 μm, and the ornamental coating layer has a thickness of 0.03-0.06 μm.

A personal ornament having as an outermost layer a white ornamental coating film composed of platinum or a platinum alloy formed by dry-plating, comprising

• an ornament base article made of a metal or a ceramic,
• an underlayer formed on the surface of the base article,
• an abrasion resistant layer formed on the surface of the underlayer by dry-plating,
• a stainless steel coating layer formed on the surface of the abrasion resistant layer by dry-plating, and
• an ornamental coating layer as an outermost layer being a white hard coating film composed of platinum or platinum alloy formed on the surface of the stainless steel coating layer by dry-plating,
• wherein the abrasion resistant layer has a thickness of 0.5-1.0 μm, and the ornamental coating layer has a thickness of 0.03-0.06 μm, and wherein the stainless steel coating layer is composed of an austenitic stainless steel having a composition of 0.01-0.12 vol % carbon, 0.1-1.5 vol % silicon, 1.0-2.5 vol % manganese, 8-22 vol % nickel, 15-26 vol % chromium, and balance of iron.

A personal ornament having as an outermost layer a white ornamental coating film composed of platinum or a platinum alloy formed by dry-plating, comprising

• an ornament base article made of a metal or a ceramic,
• an underlayer formed on the surface of the base article,
• an abrasion resistant layer formed on the surface of the underlayer by dry-plating,
• a stainless steel coating layer formed on the surface of the abrasion resistant layer by dry-plating, and
• an ornamental coating layer as an outermost layer being a white hard coating film composed of platinum or platinum alloy formed on the surface of the stainless steel coating layer by dry-plating,
• wherein the abrasion resistant layer has a thickness of 0.5-1.0 μm, and the ornamental coating layer has a thickness of 0.03-0.06 μm, and wherein at least one additional coloring coating film having a monolayer structure, a two-layer structure or a three-layer structure and having a color different from the color of the ornamental coating layer and is formed on a part of the surface of the ornamental coating layer by dry-plating or wet-plating.

A personal ornament having as an outermost layer a white ornamental coating film composed of platinum or a platinum alloy formed by dry-plating, comprising

• an ornament base article made of a metal or a ceramic,
• an underlayer formed on the surface of the base article,
• an abrasion resistant layer formed on the surface of the underlayer by dry-plating,
• a stainless steel coating layer formed on the surface of the abrasion resistant layer by dry-plating, and
• an ornamental coating layer as an outermost layer being a white hard coating film composed of platinum or platinum alloy formed on the surface of the stainless steel coating layer by dry-plating,
• wherein the abrasion resistant layer has a thickness of 0.5-1.0 μm, and the ornamental coating layer has a thickness of 0.03-0.06 μm, and wherein a surface layer comprising the abrasion resistant layer, stainless steel layer and the ornamental coating layer has a surface hardness (Hv;
• Vickers hardness micro-tester, load:
• 5 g) of 1000-2000.