Black plated resin part and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-10081312-B2
Application number	US-201615262513-A
Country	US
Kind code	B2
Filing date	Sep 12, 2016
Priority date	Oct 6, 2015
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

Abstract

A black plated resin part includes a resin base material, an underlying plating layer including a copper plating layer and a nickel plating layer formed in this order on the resin base material, a black chromium plating layer formed on the nickel plating layer, formed of trivalent chromium, and having a film thickness of not less than 0.15 μm, and a corrosion resistant film formed on the black chromium plating layer, formed of chromic phosphate or molybdenum phosphate, and having a film thickness of not less than 7 nm. A brightness of the black chromium plating layer seen through the corrosion resistant film is expressed by an L* value of not more than 54 based on the L*a*b* color system.

First claim

The invention claimed is:

1. A black plated resin part comprising:
a resin base material;
an underlying plating layer including a copper plating layer and a nickel plating layer formed in this order on the resin base material;
a black chromium plating layer formed on the nickel plating layer and having a film thickness of not less than 0.15 μm; and
a corrosion resistant film formed on the black chromium plating layer, formed of chromic phosphate or molybdenum phosphate, and having a film thickness of not less than 7 nm,
wherein the black chromium plating layer is formed on the nickel plating layer from a plating bath containing trivalent chromium compounds, and
wherein a color of the black chromium plating layer seen through the corrosion resistant film is expressed by the L* value in the range of 44 to 50, an a* value in the range of 1.5 to −1.5, and a b* value in the range of 8 to −8 based on the L*a*b* color system.

2. The black plated resin part according to claim 1 , being a decorative part for a vehicle.

3. The black plated resin part according to claim 1 , wherein the trivalent chromium compounds are selected from the group consisting of chromium sulfate, chromium nitrate, chromium chloride and chromium acetate.

4. A black plated resin part comprising:
a resin base material;
an underlying plating layer coated on the resin base material including a copper-plated layer on the resin base material and a nickel-plated layer on the copper-plated layer;
a black-chromium plating layer formed from trivalent chromium compounds coated on the nickel plating layer having a film thickness of not less than 0.15 μm; and
a corrosion resistant treatment film provided on the black chromium plating layer having a film thickness of not less than 7 nm, the corrosion resistant treatment film being achieved using a chemical conversion treatment solution containing a member selected from the group consisting of chromic phosphate and molybdenum phosphate, wherein
a color of the black chromium plating layer seen through the corrosion resistant film is expressed by the L* value in the range of 44 to 50, an a* value in the range of 1.5 to −1.5, and a b* value in the range of 8 to −8 based on the L*a*b* color system.

5. The black plated resin part according to claim 4 configured as a decorative part for a vehicle.

6. The black plated resin part according to claim 4 , wherein the trivalent chromium compounds are selected from the group consisting of chromium sulfate, chromium nitrate, chromium chloride and chromium acetate.

7. A method for manufacturing a black plated resin part, the method comprising:
forming an underlying plating layer, including a copper plating layer and a nickel plating layer in this order on a resin base material;
forming a black chromium plating layer having a film thickness of not less than 0.15 μm on the nickel plating layer by electrolytic plating; and
forming a corrosion resistant film having a film thickness of not less than 7 nm on the black chromium plating layer by chemical conversion treatment using a chemical conversion treatment solution containing a member selected from the group consisting of chromic phosphate and molybdenum phosphate,
wherein the black chromium plating layer is formed on the nickel plating layer from a plating bath containing trivalent chromium compounds, and
wherein a color of the black chromium plating layer seen through the corrosion resistant film is expressed by the L* value in the range of 44 to 50, an a* value in the range of 1.5 to −1.5, and a b* value in the range of 8 to −8 based on the L*a*b* color system.

8. The method for manufacturing a black plated resin part according to claim 7 , wherein the chemical conversion treatment solution comprises phosphoric acid, and trivalent chromium as an additive metal.

9. The method for manufacturing a black plated resin part according to claim 7 , wherein the chemical conversion treatment solution comprises phosphoric acid, and molybdenum as an additive metal.

10. The method for manufacturing a black plated resin part according to claim 7 , wherein the chemical conversion treatment is electroless treatment.

Assignees

• Toyoda Gosei Kk

Inventors

• Hotta Yuji
• Nakatani Koji

Classifications

• C25D3/06

  from solutions of trivalent chromium · CPC title

• Y10T428/12611

  Oxide-containing component · CPC title

• Y10T428/12618

  Plural oxides · CPC title

• Y10T428/12847

  Cr-base component · CPC title

• Y10T428/1291

  Next to Co-, Cu-, or Ni-base component · CPC title