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IS 13982 (1994): Zinc Alloys for Hot-Dip Coatings - Zinc -5 Percent Aluminum - Mischmetal Alloy - Specification [MTD9: Lead, Zinc, Cadmium, Tin, Antimony and their Alloys]

IS 13982 : 1994

ZINC ALLOYS FOR HOT-DIP COATINGS - ZINC-5 PERCENT ALUMINIUM-MISCHMETAL

ALLOY - SPECIFICATION

UDC 669’55 - 412 : 669’586’5

@ BIS 1994

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

NEW DELHI 110002

April 1994 Price Grollp P

Lead, Zinc, Cadmium, Tin, Antimony and Their Alloys Sectional Committee, MTD 9

FOREWORD

This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Lead, Zinc, Cadmium, Tin, Antimony and Their Alloys Sectional Committee had been approved by the Metallurgical Engineering Division Council.

The consistency of performance of zinc coatings meant that most coating methods essentially start with a reasonably pure zinc. The interest in alloy coatings has not only developed to reduce the cost of materials, but also to obtain still longer lives for zinc coated products. It is well recognized that aluminium in zinc increases its corrosion resistance but to some extent decreases its power of cathodic protection at edges and scratches. However addition of mischmetal in ‘zinc-5 percent aluminium’ alloy virtually gives same cathodic protection as pure zinc, up to twice long-term corrosion resistance. Moreover the ‘zinc-5 percent aluminium-mischmetal’ coatings are extremely flexible and can be bent with a smoother result than the pure zinc coating.

In the preparation of this standard, assistance has been derived for ASTM standard B 750 : 88 ‘Zmc-5 percent Aluminium-Mischmetal Alloy ( UNS 238510 ) in ingot Form For Hot-Dip Coatings’, issued by the American Society for Testing and Materials, USA.

For the purpose of deciding whether a particular requirement of this standard is complied with,. the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in ~rrnrrlanr~ with TS 3 * lQf3-l ‘RII~PC fnr rc~gn&gg VnlllPf VII 1-s --“v.-..s.-- 1.1. Y l” a . .S”” -.,a.-” a__ gff nnml=riral --l-1*1w-l ,-...I_ ( reviser! 1’. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

IS 13982 : 1994:

Indian Standard

ZINCALLOYSFORHOT-DTPCOATINGS - ZTNCXPERCENTALUMINIUM-MISCHMETAL

ALLOY- SPECIFICATION 1 SCOPE

This standard covers the requirements of ‘zinc-5 percent aluminium-mischmetal’ alloy in the ingot form for use in hot-dip coatings.

2 REFERENCES

The following Indian Standards are necessary adjuncts to thins standard:

IS No.

1387: 1993

1x17 II961

2600 : 1964

2600 ~( Part 1 ) : 1988

2600 ( Part 2 ) : 1988

Title

General requirements for the supply of metallurgical materials ( second revision )

Method of sampling non- ferrous metals for chemical analysis

Methods of chemical analysis of high purity zinc and zinc base alloys for die coating

Methods of chemical analysis of high purity zinc and zinc *_c-- ogre alloys for die castingsi

Part 1 Determination of copper, iron, nickel, tin, and thallium by spectrophoto- metric method (first revi- sion )

Methods of chemical analysis of high purity zinc and zinc base alloys for die castings:

Part 1 Determination of copper, iron, lead and cadmium by atomic absorp- tion spectrophotometric method (first revision )

General requirements relating to the supply of ‘zinc-5 percent aluminium-mischmetal’ alloy ingots shall conform to IS 1387 : 1993.

4 TERMINOLOGY

4.0 For the purpose of this standard following definition shall apply.

4.1 Mischmetal

A naturally occurring mixture of rare-earth elements in metallic form, primarily cerium and lanthanum.

5 MANUFACTURE

The ‘zinc-5 percent aluminium-mischmetal’ allop may be manufactured by any process, provided the manufacturer takes adequate care to ensure uniform quality.

6 CHEMICAL COMPOSITION

6.1 The chemical composition of zinc-5 percent aluminium-mischmetal’ alloy shall conform to the requirements given in the Table 1.

Table 1 Chemical Composition of Zinc-5 Percent .Aluminium-Mischmetal

Alloy Ingots

U,,.-,.-& “,...^^..& I I... -nnr \ L1IIS111T11L lYFLLFLII \ uy LLLUO3 , Aluminium 4.2 to 6-2

Cerium and lanthanum 0.03 to 0.10 Iron, Max 0,075 SiTicon, Max O*OlS Lead, Max 0’005 Cadmium, Max 0’005 Tin, A4ax 0.002 Zinc Remainder

P<GTE _ <Zinc.,5 _^ ..^^^ * ..I..-lx:..- -:__L-_&_lr’ JJCLLFIII ill”‘f11‘1,IIIII-LIIISCIIIII~~~~ alloy ingots for hot-dip coatings may contain antimony, copper and magnesium in amount of up to 0.002, 0.1 and 0.05 percent respectively. No harmful effects have been noted due to the presence of these elements up to above concentrations and therefore, analysis is not required.

6.1.1 Aluminium may be specified by the purchaser up to 7’2 percent maximum.

6.1.2 Magnesium may be specified by the purchaser up to 0’1 percent maximum.

6.1.3 Zircon and titanium may each be specified by the purchaser up to 0’2 percent maximum,

6.1.4 Any other element ( excluding antimony, copper, magnesium, zirconium and titanium )” may also be specified by the purchaser up to 0’02 percent maximum. However total of all other ele,ments specified should not exceed 0’04 percent.

6.2 The chemical composition shall be deter- mined either by the method specified in relevant standards given below or any other established instrumental/chemical method. *_- . . 0.2.1 Aluminium and magnesium - 1S 2600 : 1984 till the printing of IS 2600 ( Part 5 ) (under print ).

6.2.2 Iron - IS 2600 ( Part 1 ) : 1988 or IS 2600 ( Part 2 > : 1988.

!I?3 13982 : 1994

6.2.3 Tin - IS 2600 ( Part 1 ) : 1988. satisfy the relevant requirements, the lot shall

6.2.4 Cadmium and lead - IS 2600 ( Part 2 ) : be accepted. Should either of the retest sample

1988. fail, the lot represented shall be deemed as not complying with this standard.

6.2.5 Cerium, lanthanum, silicon, titanium and zircon - Methods to be agreed to between the supplier and purchaser till Indian Standards are formulated.

7 FREEDOM FROM DEFECTS

‘The surface of ingots shall not show any pipes, oxides inclusions, dross slag or foreignmatter and shall be clean. On fracture no inclusion or foreign matter shall appear at the section of breakage.

8 MASS AND SHAPE OF INGOTS

8.1 Unless specified otherwise, the mass of each ingot shall be 5 to 20 kg.

8.2 Ingots shall have the shape which permits stacking. Ingots may also include notches which would -allow the& to be broken into small

11 INSPECTION

11.1 .A11 inspection and testing of ingots covered in this standard shall be carried out by the manufacturer unless otherwise agreed to bet- ween the manufacturer and the purchaser. The inspection requirements shall be stated in the enquiry and order.

11.2 The purchaser shall notify the supplier while placing the order if it is his intention to inspect the ingots at the supplier’s end. The supplier shall offer the purchaser all the neces- sary facilities for inspection and testing of the ingots in accordance with this standard. For this purpose the purchaser or his representative may, by prior arrangement, attend to inspect the ingots, to select and-identify the test samples ~nrl tn .,ritnpc~ thr= toct;nm UllU L” “YILIIIY” .Y” L”U”L’~

<pieces. 12 MARKING

8.3 Certain ingots may include cast on feet, with a view to facilitate the handling of stacks of

12.1 E ac Ingot shall be suitably marked with h .

ingots. the following details:

a) Cast/lot number; and

bj Indication of the source of manufacture.

9.1 Unless otherwise agreed to between the purchaser and the supplier, five percent of ingots shall be selected from each consignment, produced under uniform conditions and offered for inspection at the same time.

9.2 The method of preparing samples for chemi- cal analysis from ingots selected under 9.1 shall be in accordance with IS 1817 : 1961.

10 RETEST

If any of the samples prepared under 9 fails to meet the requirements specified under 6, two more tests shall be conducted on the same sample in order to confirm that the analysis has been done properly. If both the test results

12.2 BIS Certification Marking

12.2.1 The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act, 1986 and the Rules and Regula- tions made thereunder. The details of conditions under which the licence for the use of Standard mark may be granted to manufacturers or producers. may be obtained from the Bureau of Indian Standards.

13 TEST CERTIFICATE

The supplier should provide a test certificate with each consignment giving information like cast/lot number and corresponding chemical composition.

2

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards _4ct, 1986 to

promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country.

IBIS has a 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 sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director ( Publications), BIS.

Beview of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such a preview indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ‘BIS Handbook’ and ‘Standards Monthly Addition’.

This Indian Standard has been developed from Dot : No. MTD 9 ( 3505 )

Amendments Issued Since Publication

Amend No. __ _______.-

Date of Issue Text Affected

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