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A JIS Mark of electro galvanized plating


 

A JIS Mark of electro galvanized plating

JISH8610)

 

1Type and Grade

 Type

 Level

Thicknessμ

      Symbol

 

 

Type 1 A

 

Grade 1

Grade 2

Grade 3

Grade 4

Grade 5

Grade 6

  Over 2

  Over 5

  Over 8

  Over 13

  Over 20

  Over 25

Ep-FeZn 2 or Ep-FeZn1

Ep-FeZn 5 or Ep-FeZn2

Ep-FeZn 8 or Ep-FeZn3

Ep-FeZn 13 or Ep-FeZn4

Ep-FeZn 20 or Ep-FeZn5

Ep-FeZn 25 or Ep-FeZn6

 

 

Type 1 B

 

 

 

Grade 1

Grade 2

Grade 3

Grade 4

Grade 5

Grade 6

  Over 2

  Over 5

  Over 8

  Over 13

  Over 20

  Over 25

Ep-FeZn 2CM1 or Ep-FeZn1-C1

Ep-FeZn 5CM1 or Ep-FeZn2-C1

Ep-FeZn 8CM1 or Ep-FeZn3-C1

Ep-FeZn 13CM1 or Ep-FeZn4-C1

Ep-FeZn 20CM1 or Ep-FeZn5-C1

Ep-FeZn 25CM1 or Ep-FeZn6-C1

 

 

 Type 2

 

 

 

Grade 1

Grade 2

Grade 3

Grade 4

Grade 5

Grade 6

  Over 2

  Over 5

  Over 8

  Over 13

  Over 20

  Over 25

Ep-FeZn 2CM2 or Ep-FeZn1-C2

Ep-FeZn 5CM2 or Ep-FeZn2-C2

Ep-FeZn 8CM2 or Ep-FeZn3-C2

Ep-FeZn 13CM2 or Ep-FeZn4-C2

Ep-FeZn 20CM2 or Ep-FeZn5-C2

Ep-FeZn 25CM2 or Ep-FeZn6-C2

 Remarks 1Type 1 A is plating only or dipped in Nitric acid.

   2Type 1 B is Bright chromate treated 

   3Type 2 is Coloured treated

   4The minimum thickness of plating does not include the film of chromate

2Meaning of terms

Sheen chromate

 Chromate treatment indicated creating the corrosion-proof film against zinc and chemical polishing action.

 Sheen chromate means giving sheen to the plating by chromate treatment.

Coloured chromate

 The film of chromate for corrosion-proof is thick and coloured. For that reason corrosion-proof chromate film is called coloured chromate. The tone of colour changes.

3Quality

 The external appearance of plating-To test the external appearance of plating we have to examine the degree of sheen, unevenness of sheen, unevenness of clour, dimness, stains, bulges, scratches, pits, exfoliation, cracks, exposure of base metal and defects caused by usage.  These defects must be eliminated.  When using chromate treatments we don’t recognize unevenness of colour as a defect.

 

The minimum thickness of plating- The minimum thickness of plating can be checked in the previous list. After various tests the results are printed in the list.

Corrosion resistance of chromate film- When doing tests on the corrosion resistance of chromate film Type 2 Grade 2-6 it is possible to get results within 48 hours.  If the chromate starts to turn white it means that corrosion has set in and is quickly identified.  However Type 1 A and Type 1 B and Type 2 Grade 1 are not subjected to the tests. (notes) Type 1 B and Type 2 Grade 1 testing times are set according to an agreement with Micro-Ace and the customer

Plating adherence- When doing test on adherence capabilities we are looking for exfoliation and bulges on the surface.

Base metal stress removal- Before plating the base metal is subjected to heat treatment according to an agreement between Micro-Ace and the customer.

Removal of hydrogen embrittlement-When removing hydrogen embrittlement the heat treatment process must take place within 4 hours after plating.  The heat treatment must be between 190℃〜230. The suitable temperature and the length of time are set according to an agreement with Micro-Ace and the customer.

4Test

External appearance test- External appearance test results are on another list so we have omitted it here.

Thickness test- Micro-Ace uses one of the following methods to check the various thickness using sections checked by microscope, magnetism electrolysis, and X-rays.  These tests are according to JISH8501 regulations

Chromate film corrosion resistance test- These tests are according to JISH8502 regulations using saltwater spray continuously for 48 hours on the chromate film.  The sample used for testing must be left standing for at least 24 hours before the tests commerce

Adherence test- Adherence tests are according to JlSH8504 regulations.

 

5Check

The following are a list of tests.

1Plating tests are done according to rigid quality regulations

2Tests are done according to JISZ9031 using parts from the same lot or the same category.

  Note lThe tested item and the kind of test are set according to an agreement with Micro-Ace and the customer.

       2The amount of tests, the order of tests, the part of the sample to be tested, and what the sample is to be used for are set according to an agreement with Micro-Ace and the customer.  

6Plating terminology

   Plating terminology is listed in the following order :

   Plating types, base metal, minimum thickness of plating

Example 1Electro galvanized plating on steel with thickness 20μm

      EP-FeZn 20 or EP-FeZn(5)

Example 2Electro galvanized plating on steel with thickness of  8μm. Sheen chromate is used as an after treatment.

      EP-FeZn 8CM1 or EP-FeZn(3-C1)

Example 3Electro galvanized plating on steel with thickness of 5μm. Coloured chromate is used as an after treatment.

      EP-FeZn 5CM2 or  EP-FeZn(2-C2)

7Invoice

 Indication of the following items on the invoice.

1Types or levels or symbols of these

2Processing date or code of it

3Processing company name or code of it

 

 

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