Anodic oxide coatings on aluminum and aluminum alloys JIS H8601

JIS H8601 is based on ISO7599: 1983, Anodizing of aluminum and its alloys-General specifications for anodic oxide coatings on aluminum, which was published as the first edition in 1983. Is a Japanese Industrial Standard created without changing the technical content, but among the qualities, the regulation content (characteristics and quality) that is not stipulated in the corresponding international standard has been added as the Japanese Industrial Standard.

Scope of application

This standard is a general standard for anodized aluminum and aluminum alloys and specifies quality and test methods. However, this standard excludes the following:

1. Barrier film

2. Painting or plating base film

3. Hard anodic oxide film specified in JIS H8603

1. 1. Definition

The definitions of the main terms used in this standard are based on JIS H 0201.

2. Guidelines for anodizing and quality of aluminum

Guidelines for anodizing and quality of aluminum are given in Annex 1.

Remarks 1. Regarding the color, the test will be conducted on the colored one.

Remarks 2. The test items for the unclear film used environment classification are based on the agreement between the delivery parties.

5. quality

1. Appearance

The appearance of the film shall be free of scratches, unevenness on the surface, powder blowing, and other harmful defects on the work surface. Appearance quality may be based on standard or limit swatches agreed between the delivery parties, as appropriate.

2. Colors and their tolerances

Colors and their tolerances are negotiated by agreement between the parties to the delivery. Colors and their acceptable quality may optionally be based on standard or limit swatches agreed between the delivery parties.

3. Film thickness

The film thickness grade is expressed in terms of average film thickness (μm) and shall comply with Table 2.

The film thickness grade is selected in consideration of the product application and usage environment, but is as shown in Table 2 unless there is a special agreement between the delivery parties.

4. Film thickness grade and main application examples

The film thickness grade is selected in consideration of the product application and usage environment, but is as shown in Table 3 unless there is a special agreement between the delivery parties.

If a special film thickness is required depending on the application, an average film thickness that does not meet the average film thickness grade specified in Table 2 may be determined.

5. Corrosion resistance

Corrosion resistance of the film is a property that can withstand various environments, and depending on the application, properties that can withstand the environment such as acidity, alkalinity, and salt water atmosphere may be required, but the quality must comply with Table 4 or Table 5. Must be.

6. Abrasion resistance

The wear resistance of the film is a property that can withstand a wear environment, and depending on the application, a property that can withstand a wear environment such as wear due to collision of a wearable substance, sliding wear, and rolling friction may be required, but its quality. Must comply with any of Table 6.

The wear resistance of the injection wear test is determined by the continuity determination method, and is expressed by the wear time [WJ (T)] until the substrate is exposed.

7. Sealing degree

The degree of sealing is an important property that affects corrosion resistance, stain resistance, etc. when applied to various environments, and any of Table 7 except when a film that does not seal is required for special purposes and AA3. Must comply with.

8. Crack resistance due to deformation

Depending on the application of the film, the film may be deformed by stress and cracks may occur.

For such applications, crack resistance due to deformation of the film may be required, in which case the required quality depends on the agreement between the delivery parties.

9. Color promotion light resistance

The color of the colored film changes due to the action of light, ultraviolet rays, heat, etc. in the actual usage environment.

Color fastness refers to resistance to such color changes. It is desirable to check the light fastness of the colored film by exposing it under the same conditions as the usage environment, but for quality control purposes, it is necessary to evaluate it in a short time, so the light fastness or ultraviolet rays. Evaluate by conducting a light fastness promotion test.

10. Light fastness of colored film

The light fastness of a colored film is a method of evaluating the light fastness of a color mainly by irradiating visible light. When the light fastness of the colored film is required depending on the application, it is as follows.

Indoor products: 5 or more

Outdoor products: 9 or more

11. Ultraviolet fastness of colored film

The ultraviolet fastness of a colored film is a method of evaluating the color fastness mainly by irradiating ultraviolet rays. Depending on the application, the ultraviolet light fastness of the colored film may be required, but the quality depends on the agreement between the delivery parties.

It is suitable for production control because the quality can be evaluated by exposing the colored film for construction for a short time.

12. Mirror gloss

The mirror gloss is a mirror gloss characteristic of the film surface, and is expressed by the ratio of the specular light reflected from the film surface to the specular light reflected from the reference surface (glass having a refractive index of 1.567). Depending on the application, the mirror gloss property of the film may be required, but the quality depends on the agreement between the delivery parties.

13. Photographicity

The reproducibility of the film is a characteristic of the film surface that captures the image of an object facing the surface of the film, and the reproducibility of the film may be required depending on the application, but the quality depends on the agreement between the delivery parties.

If the surface of the film has streaks (concavities and convexities with directionality), the mapability differs in the direction perpendicular to and parallel to the streaks.

14. Visual measurement method

The visual perception measurement method as a method for evaluating the mapability is a method for visually observing the morphology of the chart scale image projected on the test surface and examining the mapability.

15. The instrument measurement method as a method for evaluating image quality is to divide the reflected light from the measurement surface into specular reflected light and diffuse reflected light by a moving optical comb (comb), measure the amount of light, and measure the total reflected light. This is a method of obtaining the imageability by the ratio of the specularly reflected light to.

16. Dielectric strength

The dielectric strength of the film is the ability to withstand the AC voltage of the film, and the insulation of the film may be required depending on the application, but the quality depends on the agreement between the parties to the delivery.

17. Continuity

The continuity of the film is a characteristic indicating the continuity of a thin film having a film thickness of 5 μm or less, and when there is a scratch on the surface of the film, it is possible to distinguish the defect that the scratch has reached the base metal. The continuity of the film may be required depending on the application, but the implementation depends on the agreement between the delivery parties.

18. Film mass

The mass of the coating is tested when labeling by the mass of the coating is required. Its quality depends on the agreement between the delivery parties. This method does not apply to aluminum alloys with a copper content of 6% or more.

When the apparent density of the film is obtained, the film thickness can be roughly calculated.

Table 2 Film thickness grade

Remarks. There shall be no measurement point film thickness that does not meet 80% of the specified average film thickness.

Table 3 Film thickness grades and main application examples

Remarks. If necessary for the purpose of use, the minimum film thickness may be agreed upon by the agreement between the delivery parties, not limited to the average film thickness grade.

Table 4 Alkaline corrosion resistance (alkali dropping test or electromotive force type alkali resistance test)

Note) Class A and Class B are classified according to their characteristics.

Remarks. The electromotive force type alkali resistance test is performed on the film of grade AA20 or higher, and the alkali dropping test is not applied.

Table 5 Cass corrosion resistance

Table 6 Wear resistance

Note) The number of reciprocating motions required to wear the 1 μm film

Table 7 Sealing degree

Note) This test does not apply to dark-colored films such as organic dye films and electrolytic colored films.

Note) Admittance value corrected to the value for a film thickness of 20 μm.

For electrolytic colored film and organic dyed film, this value may not be obtained, so it depends on the agreement between the delivery parties.

Remarks 1. Arbitration method for the degree of sealing

If the degree of sealing is controversial in the dye adsorption test or the admittance measurement test, the arbitration method is to test by the phosphoric acid-chromic acid aqueous solution immersion test of JIS H8683-1, and the degree of sealing of the film is 0.03 g in mass reduction. It should be / dm2 or less.

Remarks 2. The base material must not be exposed in the phosphoric acid-chromic acid aqueous solution immersion test.

6. Examination rules

1. Test piece collection method

The test piece shall be collected from the effective surface of the product. However, if a test piece cannot be collected from the product, a test piece in place of the test piece may be used.

The substitute specimen must be representative of the product.

2. Acceptance test

The acceptance test will be conducted by agreement between the parties to the delivery, taking into consideration the characteristics and quality according to the application.

3. Management test

Testing for control purposes is carried out by the producer by selecting a suitable test method in consideration of characteristics and quality.

7. test

1. Examination of appearance and color and its tolerance

Testing of the appearance and color of the coating and its tolerances is usually performed in diffuse daylight from the distance specified by the agreement between the parties to the delivery. When operating under an artificial light source, the illuminance shall be 600 lx or more, and the light source shall be the D65 standard light source specified in JIS Z 9112 or a color rendering AAA lamp. The background is preferably an achromatic color such as matte black or gray.

When collating with standard color swatches or limit swatches agreed between the delivery parties, they are usually kept on the same plane, the diffused light source for illumination is placed behind the inspector, and the inspection direction is always the same. Judgment is made in this way.

Note) Diffuse daylight refers to the light from the north window that avoids direct sunlight from 3 hours after sunrise to 3 hours before sunset.

2. Film thickness test

The film thickness test is based on one of the following.

Microscopic cross-section test method (JIS H8680-1)

Eddy current measurement method (JIS H8680-2)

Split beam microscope measurement method (JIS H8680-3)

Film mass measurement method (JIS H8688)

However, the measurement position and the number of measurements on the effective side are based on an agreement between the delivery parties.

The measurement position on the effective surface shall be within 5 mm from the contact point and excluding the vicinity of the sharp edge.

Remarks. If there is a dispute over the film thickness, use the microscopic cross-section measurement method. However, for films with a film thickness of less than 5 μm, the film mass measurement method shall be used, and the minimum mass of the film per unit area shall be adopted by agreement between the parties concerned with delivery.

3. Corrosion resistance test

The corrosion resistance test of the film is based on one of the following.

Alkaline dropping test (JIS H8681-1)

Electromotive force type alkali resistance test (JIS H8681-1)

Cass test (JIS H8681-2)

Acetic acid spray test (JIS Z2371)

Neutral salt spray test (JIS Z2371)

However, as a general rule, the alkali dropping test method and the Cass test method are not applied to films with a film thickness of 5 μm or less.

4. Sealing degree test

The sealing degree test of the sealed film shall be as follows.

Dye adsorption test (JIS H8683-1)

Phosphoric acid-chromic acid aqueous solution immersion test (JIS H8683-2)

Admittance measurement test (JIS H8683-3)

5. Crackability test due to deformation

The test for examining the resistance to cracks due to deformation of the film is based on the crack resistance test due to deformation specified in JIS H8684.

6. Color acceleration light resistance test

The color fastness test of the colored film is based on one of the following.

Light fastness test (JIS H8685-1)

Ultraviolet light fastness test (JIS H8685-2)

7. Mirror gloss test

The mirror gloss test of the film is based on the mirror gloss measurement method specified in JIS Z 8741.

8. Imaging test

The mapability test of the film is based on one of the following.

Visual measurement method (JIS H8686-1)

Instrument measurement method (JIS H8686-2)

9. Dielectric strength test

The dielectric strength test of the film is based on the dielectric strength test specified in JIS H8687.

10. Continuity test

The film continuity test is based on the continuity test specified in JIS H8689.

11. Film mass measurement test (surface density)

The mass measurement test of the film is based on the mass measurement test per unit area of ​​the film specified in JIS H 8688.

8. Inspection

The inspection of the film shall be the test specified in the test for the quality items agreed in the agreement between the delivery parties regarding the characteristics and quality items.

Unless there is a special agreement between the delivery parties, the test must be conducted based on the test items for each usage environment and pass the specified characteristics.

The sampling method and lot size of the target test piece shall be determined in consideration of the scale of the processing facility, product type, size, quantity, and the like.

Remarks. As a film thickness control method at the production site, the minimum film thickness control method may be adopted only when the minimum film thickness that can maintain the average film thickness is required in advance.

9. How to call the film

The name of the film depends on the order of the film grade and the symbol of the quality item. However, the quality item symbol may be omitted by agreement between the delivery parties.

Table 8 Quality item symbols

Example 1. Grade AA15 Cass Corrosion resistance and wear resistance (jet wear test) coating

AA-15 ・ Lc-W J (T)

AA-15 (if omitted)

Example 2. Grade AA10 Alkaline corrosion resistance (electromotive force type alkali resistance test) Class B, abrasion resistance (sand removal wear test) film

AA-10-B / Kc-WR F

AA-10-B (if omitted)

Example 3. Grade AA6 Alkaline corrosion resistance (Alkaline dropping test) Class A, Abrasion resistance (Sand removal wear test) film

AA-6-A ・ K S -WR F

　  AA-6-A (if omitted)

Example 4. Grade AA3 sealing degree (phosphoric acid-chromic acid aqueous solution immersion test) film

AA-3 ・SP

AA-3 (if omitted)

10. display

Display the following items on the invoice.

Film grade

b. Serial number

c. Processor or its abbreviation