GB/T 8013.2-2018Anodic oxide coatings and organic polymer coatings on aluminium and its alloys - Part 2: Combined coatings (English PDF)

3.1

The film types and characteristics and typical applications of combined coatings are shown in Table 1.

Table 1 Film types and characteristics and typical applications of combined coatings

Film type Film characteristics Typical application

Classification according to the film luster Glossy film The film has bright surface and high specular reflectivity. Accessories, electrical equipment, furniture, interior decoration materials for vehicle and rail traffic, solar energy frame, building and decoration materials

Matt film The film has soft surface gloss and low specular reflectivity. Furniture, interior decoration materials for vehicle, solar energy frame, building and decoration materials

Classification according to the film color Transparent film The film is colorless and transparent, and painted by such electrophoretic paint without any pigment. Accessories, electrical equipment, furniture, interior decoration materials for vehicle and rail traffic, solar energy frame, building and decoration materials

Color film The film has various colors, but due to the influence of the performance of the pigment used, the weather resistance and corrosion resistance are different from those of the transparent film. Accessories, electrical equipment, interior decoration materials for vehicle and rail traffic, solar energy frame, building and decoration materials 3.2 The film code, film thickness level and film type of combined coatings are shown in Table 2.

Table 2 Film code, film thickness level and film type of combined coatings

Film code Film type Remarks

EA21 Glossy or matt transparent film In the film code:

“EA”, “EB” and “EC” are types of anodic oxide+glossy or matt transparent film;

“ES” is the type of anodic oxide+ glossy or matt color film; “EZ” is the type of anodic oxide+ glossy or matt film;

The numbers in the code indicate the minimum local thickness limit of anodic oxide coatings and combined electrophoretic coatings.

EB16

EC13

EZ8

ES21 Glossy or matt color film 3.3 It is permitted to take mechanical pretreatment (such as sand blasting, wire drawing, polishing, etc.) before anodizing in order to achieve a special decorative effect upon agreed between the supplier and the purchaser.

4.1 Appearance

With uniform color and gloss, it is not allowed to have defects like wrinkles, cracks, bubbles, flow marks, pockmarks, inclusions, stickiness, film peeling. As for other requirements, refer to sample plate agreed between the supplier and the purchaser.

4.2 Color difference

In the determination with the visual method, the color difference shall be dependent on the color plate agreed between the supplier and the purchaser. In the instrumental determination, the color difference value shall be agreed between the supplier and the purchaser. The method for determining color difference shall be noted in the purchase order (or contract).

4.3 Luster

The request of the purchaser for luster, if any, shall be indicated in the purchase order (or contract) for the performance.

4.4 Film thickness

The thickness of the combined coatings consists of anodic oxide coatings thickness and film thickness. The film thickness shall conform to Table 3.

Table 3 Film thickness

Film code Film thickness

µm

Local thickness of anodic oxide coatings Local thickness of film Local thickness of combined coatings

EA21 >=9 >=12 >=21

EB16 >=9 >=7 >=16

EC13 >=6 >=7 >=13

ES21 >=6 >=15 >=21

EZ8 >=3 >=5 >=8

4.5 Hardness

In terms of the hardness, the film shall not be less than 3 H.

4.6 Abrasive resistance

4.6.1

The result of sand falling test shall be as specified in Table 4.

4.6.2

When the purchaser requires to test abrasive resistance in abrasive blasting method, it shall indicate it in the purchase order (or contract) and its performance requirements shall conform to the provisions in Table 4.

Table 4 Performance requirements and typical applications of abrasive resistance

Test method Performance requirements Typical application

Abrasive blasting method The total time from the start to the end of the test shall not be less than 35 s. Solar energy frame, building and decoration materials, electrical equipment, furniture

Falling abrasive method The amount of sand used shall not be less than 3,300 g.

4.6.3

Special requirements from the purchaser, if any, shall be agreed between the supplier and the purchaser, and shall be indicated in the purchase order (or contract).