Aluminum alloy coating, aluminum alloy wheel hub and spraying method of aluminum alloy wheel hub

Patent metadata

Field	Value
Publication number	US-11660636-B2
Application number	US-201916552075-A
Country	US
Kind code	B2
Filing date	Aug 27, 2019
Priority date	Jun 25, 2019
Publication date	May 30, 2023
Grant date	May 30, 2023

Abstract

The present disclosure provides an aluminum alloy coating, an aluminum alloy wheel hub and a spraying method of an aluminum alloy wheel hub. The aluminum alloy coating includes a base powder layer, a main body layer and a transparent powder layer from inside to outside. The main body layer includes at least two prime coat layers and at least two colored paint layers which are superposed in a preset order.

First claim

The invention claimed is:

1. An aluminum alloy coating, comprising a base powder layer, a main body layer and a transparent powder layer from inside to outside,
wherein the main body layer comprises at least two prime coat layers and at least two colored paint layers which are superposed in a preset order.

2. The aluminum alloy coating according to claim 1 , wherein the main body layer comprises a first colored paint layer of the at least two colored paint layers, a first prime coat layer of the at least two prime coat layers, a second prime coat layer of the at least two prime coat layers and a second colored paint layer of the at least two colored paint layers from inside to outside.

3. The aluminum alloy coating according to claim 2 , wherein the first colored paint layer is 10 to 20 microns in thickness and the second colored paint layer is 10 to 20 microns in thickness.

4. The aluminum alloy coating according to claim 2 , wherein the first prime coat layer is 20 to 40 microns in thickness and the second prime coat layer is 20 to 40 microns in thickness.

5. An aluminum alloy wheel hub, wherein a surface of the aluminum alloy wheel hub comprises the aluminum alloy coating according to claim 2 .

6. A spraying method of an aluminum alloy wheel hub, wherein the method is applied to the aluminum alloy wheel hub according to claim 5 , comprising:
spraying base powder to a pretreated surface of the aluminum alloy wheel hub to form the base powder layer;
spraying a first colored paint to the base powder layer to form the first colored paint layer;
spraying a first prime coat to the first colored paint layer to form the first prime coat layer;
spraying a second prime coat to the first prime coat layer to form the second prime coat layer;
spraying a second colored paint to the second prime coat layer to form the second colored paint layer; and
spraying transparent powder to the second colored paint layer to form the transparent powder layer.

7. The method according to claim 6 , wherein before spraying the base powder to the pretreated surface of the aluminum alloy wheel hub, the method further comprises:
pretreating a surface of the aluminum alloy wheel hub, and the pretreatment at least comprises degreasing, water washing, acid washing, pure water washing, passivation and blocking.

8. The method according to claim 6 , wherein the spraying of the first colored paint to the base powder layer and the spraying of the second colored paint to the second prime coat layer each comprise:
performing the spraying through an air gun under conditions of a distance of 180 to 250 mm between a spraying port and a surface to be sprayed, an atomization pressure of 2.0 to 4.0 bar of the air gun, a fan pressure of 1.0 to 4.0 bar, a paint dispensing rate of 50 to 300 cc/min, a temperature of 55 to 65° C. of the surface to be sprayed, a curing temperature of 130 to 150° C. and a heat preservation time of 15 to 25 min.

9. The method according to claim 6 , wherein the spraying of the first prime coat to the first colored paint layer and the spraying of the second prime coat to the first prime coat layer each comprise:
performing the spraying through a rotating cup gun under conditions of a distance of 180 to 250 mm between a spraying port and a surface to be sprayed, a paint dispensing rate of 50 to 250 cc/min, a driving air pressure of 1.0 to 2.0 bar, a fan pressure of 1.0 to 2.0 bar, a static voltage of 30 to 60 kV, a temperature of 40 to 50° C. of the surface to be sprayed, a curing temperature of 140 to 160° C. and a curing time of 10 to 15 min.

10. The method according to claim 6 , wherein the spraying of the base powder on the pretreated surface of the aluminum alloy wheel hub and the spraying of the transparent powder on the second colored paint layer each comprise:
performing electrostatic spraying under conditions of an electrostatic voltage of 30 to 80 kV, a powder spraying amount of 35 to 80%, a total gas volume of 3.5 to 5.0 m/h, a distance of 180 to 250 mm between a spraying port and the surface to be sprayed, a curing temperature of 170 to 180° C. and a curing time of 15 to 20 min.

Assignees

• Citic Dicastal Co Ltd

Inventors

• Han Peng
• Wei Qingwang
• Song Yafei
• Shu Yongfeng
• Zhang Jian
• Gu Kun
• Liu Yu
• Li Jian

Classifications

• B05D1/00

  Processes for applying liquids or other fluent materials (B05D5/00, B05D7/00 take precedence) · CPC title

• B60B2900/211

  Soiling · CPC title

• B05D5/06

  to obtain multicolour or other optical effects (B05D5/02 takes precedence) · CPC title

• B60B2310/616

  Coating with thin films · CPC title

• B05D1/36

  Successively applying liquids or other fluent materials, e.g. without intermediate treatment · CPC title