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है”ह”ह

IS 13177 (1991): Passivation of stainless steel parts [MTD7: Light Metals and their Alloys]

Indian Standard

PASSIVATION OF STAINLESS STEEL PARTS - SPECIFICATION

UDC 669’14’018’8 : 620’197’2

@ BIS 1991

BUREAU OF INDIAN STANDARDS I MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

October 1991 Price Group 1

IS 13177 : 1991

Indian Standard

PASSIVATIONOF STAINLESS STEEL PARTS-SPECIFICATION

1 SCOPE 4.4 Humidity Test

This standard specifies the requirements for the chemical dip passivation coating en wrought or cast stainless steels.

2 REFERENCE

The Indian Standards listed below are necessary adjuncts to this standard:

Processed parts selected as per 5.2 shall be used for humidity test. The parts so selected shall be subjected to 95 to 100 percent humidity at 38” to 46°C in a suitable humidity chamber for 24 to 26 h. After completion of the test, the surface should show no evidence of rust strains or corrosion on the product.

IS No,

9844 : 1981

10117 : 1982

Tit Ie

Method of testing corrosion resistance of electroplated and anodized aluminium coatings by neutral salt spray test

Code of practice for passivation of stainless steel articles

5 SAMPLING

5.1 Lot

A lot shall consist of passivated parts of similar alloy or similar manufacturing methods such as welded, brazed, wrought, shell moulded castings, etc, treated under similar conditions shall be submitted for inspection at one time.

5.2 Sampling for Acceptance of a Lot

3 GENERAL REQUIREMENTS

The stainless steel part, as far as practicable, be passivated in accordance with IS 10117 : 1982.

4 COATING REQUIREMENTS

4.1 Appearance

The passivated parts shall exhibit a smooth, clear surface and show no etching or frosting when examined. The passivation treatment shall not produce any change in appearance.

Processed parts shall be selected at random for the various tests from each lot as indicated in Table 1, examined and compared with the requirements of 4.1, 4.2, 4.3 and 4 4. If the number of non-conforming parts in any sample for any of the requirements exceeds the accep- tance number for that sample size, the lot represented by the sample shall be rejected.

Table 1 Sample Size

4.2 Salt Spray Test

Number of Parts in Lot Insuections

Processed parts selected as per 5.2 shall be tested in accordance with IS 9844 : 1981. The part are washed in distilled or deionized water, dried with a soft-cloth and then exposed to 5 per- cent salt-spray ( sodium chloride > for a period of 2 oh. At the end of the test, parts shall not exhibit staining attributable to the rusting of particles or free iron embedded in the surface,

2 to 15 16 to25 26 to 90 91 to 150

151 to 500 501 to 1 200

1201 to 1 1000

Nu;i;;sof Acceptance Number

Rejection Number

Sampled - ~~I

2 3 5 0 1 8

13

20 1 2 32

4.3 Water Immersion Test 6 TEST FOR PASSIVATION FILM

Processed parts selected as per 5.2 shall be used for water immersion test.

6.1 Copper Sulpbate Test

Immerse the parts in acetone, swab with clean gauze saturated with acetone and dry in inert atmosphere or in desiccator. Immerse in distilled water for 1 h and repeat the cycle of immersion and drying for a period of 24 h. After the test, parts shall show no evidence of rust stains or other corrosion on the -product.

This method is used for the detection of metallic iron on the surface of austenitic stainless steels. It is not recommended for martensitic stainless steels.

6.1.1 Immerse the parts in acetone, swab with clean gauze saturated with acetone and dry in inert atmosphere or in desiccator. Swab the

I

IS 13177 : 1991

surface to be inspected with the following 6.2.1 Swab the surface to be inspected with a solution : freshly prepared solution given below :

Copper sulphate 16g Water, distilled 1 Sulphuric acid 4-6 ml

Apply additional solution on the test surface, if needed to keep the surface wet for a period of 6 minutes. Wipe the surface dry and examine for areas of deposited copper. A copper deposit indicates the presence of metallic iron.

6.2 Potassium Ferricyanide - Nitric Acid Solution Test

This method is used for the detection of metallic iron on the surface of stainless steels. It is not recommended for martensitic stainless steels.

Potassium ferricyanide 10 g (chemically pure)

Nitric acid 30ml

Water, distilled 1

(Keep this solution in amber-coloured bottle).

The appearance of dark blue colour within 30 seconds indicates the presence of metallic iron.

7 MARKING

The coated articles may also be marked with the name or trade-mark of the processors.

2

Boreau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and siaes, type or grade designations, Enquiries relating to copyright be addressed to the Director ( Publication ), BIS.

Revision of Indian Standards

Indian Standards are reviewed periodically and revised, when necessary and amendments, if any, are issued from time to time. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition. Comments on this Indian Standard may be sent to BIS giving the following reference :

Dot : No. MTD 20 ( 3568 )

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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