Technical data

Details of JIS notation of anodized film "Alumite", corrosion resistance test (alkali dropping test, electromotive force measurement test), and wear resistance test (sand drop wear test, injection wear test, reciprocating motion wear test).

Anodizing `` Alumite'' JIS notation

JIS notation of anodized film (anodized)

アルマイト

Corrosion resistance test of anodized film (anodized)

(1) Alkaline dropping test

This exam is unique to Japan. Using the alkali dropping test device shown in FIG. 1, 100 g / L sodium hydroxide solution was sequentially dropped onto the test piece in a constant temperature bath at 35 ± 1 ° C., and the time (seconds) until the film was dissolved was long. This is to check the alkali corrosion resistance.

Since the amount of sodium hydroxide solution dropped is small, it is not suitable for measuring films of 20 μm or larger.

To determine whether the film has melted, after cleaning and drying the test piece, a load of 50 g using a measuring probe is considered to be conduction when the DC resistance of the circuit meter is 5 KΩ or less.

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(2) Electromotive force measurement test

This test is unique to Japan and is an improvement of the alkaline dropping method. In principle, the test value is the time required for a film of a certain area to dissolve in the sodium hydroxide solution.

In the test, using the electromotive force measurement test device shown in [Fig. 1], 1 mL of 100 g / L sodium hydroxide solution was brought into contact with the film on a test piece held at 35 ° C, and when the substrate was exposed, the substrate was exposed. This is a method to check the alkali corrosion resistance by capturing the voltage of 1 mV generated between the measurement cell and the measurement cell.

Compared to the alkaline dropping test, the test operation is easier, human error is eliminated, and the test solution is relatively large at 1 mL, so it is possible to measure even a thick film of 20 μm or more.

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Abrasion resistance test of anodized film (anodized)

(1) Sand removal wear test

This is a test to evaluate the wear resistance of the plating by dropping the abrasive from the specified height on the plating surface using the equipment shown in [Fig. 1].

Abrasive

Artificial abrasive The silicon carbide grinding material C # 80 specified in JIS R 6111 is used. Use the one that has been sufficiently dried at 110 ° C in advance and stored in a desiccator.

Fall amount

The amount of fall of the abrasive shall be 320 ± 10 g / min.

end point

When the substrate is exposed

Judgment formula by mass change

WR = T / <W1-W2>

WR: Abrasion resistance <S / mg>

w1: Weight of sample before test <mg>

w2: Weight of sample after test <mg>

T: Test time <S>

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(2) Injection wear test

This is a test to evaluate the wear resistance of plating by accelerating the abrasive with compressed air and injecting it onto the sample using the equipment shown in [Fig. 2].

Abrasive

Artificial Abrasive Material Use a silicon carbide grinding material C # 100 specified in JIS R111 that has been sufficiently dried at 110 ° C in advance and stored in a desiccator.

Fall amount

The amount of fall of the abrasive shall be 23 ± 1 g / min.

Judgment method

1 The end point is the exposure of the substrate

2 Method of judging by measuring the wear depth of the sample

32 calculates the maximum value of the wear depth after injection for a certain period of time by obtaining it with a surface roughness meter or a split microscope.

Discriminant

WR = T / t

WR: Abrasion resistance <S / μm>

T: Test time <S>

t: Maximum wear depth <μm>

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(3) Reciprocating motion wear test

This is a test to evaluate the wear resistance of plating by applying a contact load between the wear wheel to which abrasive paper is attached and the sample using the device shown in [Fig. 3] and performing reciprocating friction.

Abrasive paper

Polished CC or WA # 240-600 specified in JIS R6252 is used.

sample

80 x 80 mm flat plate is standard.

Judgment method

Judgment by mass change or plating thickness change

Discriminant

WR = N / <w1-w2> or WR = N / <t1-t2>

WR: Abrasion resistance <DS / mg> or <DS / μm>

w1: Weight of sample before test <mg>

w2: Weight of sample after test <mg>

t1: Plating thickness before test <μm>

t2: Plating thickness after test <μm>

N: Number of round trips <number of DS>

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Connection Co., Ltd.

Please feel free to contact us for plating, coating, polishing, heat treatment, etc.

Consultations and quotations are free.

​4-202-5 Shizugaoka, Fukui City, Fukui Prefecture 910-3635 (Japan)

​Reception hours 9: 00-18: 00 

Direct phone 090-6819-5609

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