IS : 2633 - 1986 eaffiied 1992 ) ( Reaffirmed 2006
Indian METHOD UNIF OR MITY
ZINC
Standard OR TESTING O F C O AT AT I N G
COATED
( Second
ARTICLES
Revision
Third Reprint MARCH 199’7
ON
Indian
Standurd
METIIOD
FOR TESTING
UNIFORMITY
,OF COATING
ZINC
COATED
(
d
ARTICLES
ision ision )
Hot-Dip Sprayed and Diffusion Diffusion Coatings Sectional Sectional Committee, Committee, SMDC 28 Chairman
ON
Is
2633 -
Con/bed
19Sb
./mm
page
Reppresenrinp
Members DR
D. MA~ESHW.&RI SIIILI K. I<. N,zr,\r
Sti171 S. IZIAJU~IDAR
The Indian 1 ( Alternate L):I-ecio~a(e
Snnr P. C. M~IKHERJ~E DR T. MUKHERJEE SI~ICIB. SI~ICIB. N. SINGU ( :f/~mrir/c. SHRI
S.
NEELAKANTAN
Dlt A. !<. Y,FSK,if< f f/lrW/~/lC
RI
D.
SHRI
L,
PUC;AZHENl?IY
!&WI SHRI
r\.
Sf N<;UI ’-IA
Gcncrnl of Technical
Development,
Delhi Indian Posts & Trlerraohs Dcnnrtmenr. Calcutt The ‘rata ‘rat a Iron & geei Co Lid, Ja&edpur
Zcni:h
New
Steel Pipes Pipes Lt.J. Bombay
Keen, Williams Ltd: Calcutt Indian Lead, Zinc Information Ccntre, New Delhi EMC Stcelal Ltd, Calcutta
’ Guest,
PAUL
SHRI s. N. SING SIIRI PINAKI GIIOSH ( Alfemrfc SHRI N. I<. SING114L SHRI
Tube Co LtJ, Jamshedpur
The
Irxliar~
Iron
and
Steel
Co
Lld,
Burnpur
( .d/tc W/l/tC W/l/tC
Special Steel Limited, Bombay J. I,. SONEJI S~IH M. R. DOCTOR ( A/loxofc A/loxofc Director General, BIS Ex-o//icio K . RAGHAVWL~IIN,
hf~wd~ur
18 : 2633 - 1986
Indian
Standard
METHOD
FOR TESTING
UNIFORMITY
OF COATING
ZINC
COATED
( Se ond
0. 0.1 This Indian
Standard
ON
ARTICLES
hion hio n
FOREWORD ( Second Revision ) was adopted by the Indian
2 63 3
1 98 6
This test is suitable for the following articles. 0.5.1 Sheet, wire, tube, bolts, nuts and other threaded articles of similar size. 0.5.2 Articles fabricated from strip, bar or tube up to a length of one metre and not exceeding 75 mm in width or 50 mm in diameter. 0.5.3 Castings, angle brackets brackets and structural shapes with an overall overall size of not more then 200 x 150 x 100 mm of approximate mass not more then 4 kg coated after fabrication. 0.5.4 Articles having dimensions dimension s greater than those specified in 0.5.2 and 0.5.3 shall shal l be subjected to visual inspection only as laid down under 0.5.5. 0.5.5 Samples of such articles, after galvanizing, galv anizing, shall be stored for at least one week under cover, but with all surfaces as far as possible, exposed The zinc coating as seen by by visual inspection at to free movement of air the end of this period after storage shall be clean, smooth, continuous and
IS : 2633 - 1986 2. SAMPLING AND PREPARATION OF TEST PIECES 2. Sampling - The number of samples to be tested shall be as specified in material specification. In the absence of such a standard, standard , the degree of sampling shall be as agreed to between between the galvanizer and the purchaser.
2.2 Preparation of Test Pieces s hall be cut off from 2.2.1 Sheet - A test piece of 100 x 100 mm shall sheet selected as per material specification. sample length of the wire shall be cut from one one or 2.2.2 Wire -The a re obviously both ends of the coil under test. Portions of wire which are damaged shall not be used as sample. In case of stranded or armoured wire, or wire which has undergone any other similar process, care should be taken to avoid damage in preparing the sample. A sample of suitable length but not less than 150 mm, shall be cut from one or or both ends of the selected coil.
IS : 2633 - 1986 The new test pieces shall they shall be discarded and new ones selected. be cleaned in i n alcohol, rinsed and wiped dry, and then immersed for 3 minutes in a solution consisting of one part by volume of of ammonium hydroxide hydroxide (sp gr 0.90 ) and nine parts of distilled water. The test pieces After cleaning, may be scrubbed with cotton cloth during this immersion. 3. COPPER SULPHATE SOLUTION 3.1 Preparation
a) Dissolve
about 36 g of technical grade copper sulphate crystals conforming to IS 261-1982* in 100 ml of distilled water (see Note). Heat the water to aid solution, but if heated, the solution should be cooled before neutralizing.
b) Neutralize
the free sulphuric
acid in solution
by shaking shakin g
with
S : 2633 - 1986
4. PROCEDURE 4.1 The clean test pieces shall be subjected to as many one-minute and half-minute successive dips as prescribed in the relevant standard, standa rd, in copper sulphate solution ( SPP3) kept at a temperature of 18 f 2°C. Halfminute dips shall bc carried out after after completion of all the one-minute dips. If possible, immerse the test pieces completely, completely, taking care that they do not touch each other. During the test, neither the test pieces nor the shall be agitated. After each dip, withdraw withdra w the test pieces, rinse solution immediately in clean running water ( see Note 1 ). Remove any black deposit including holes and pockets by suitable brush (see Note 2). Wipe and dry the test pieces with a clean soft cloth and return immediately to solution. 4.1.1 Successive dips of one-minute each shall be continued, with washing and wiping w iping of the test pieces after after each dip, until the test pieces have withstood the required number of dips or until the end point has been
IS : 2633 - 1986 prescribed in JS: 4826-1979* or any other relevant Indian Standard Standa rd specification. The half-minute dips shall shal l be carried out after the completion completion of all the one-minute dips. 5.2 Other Articles - Unless otherwise otherwise specified, specified, the sample shall be subjected to four successive dips in the solution, each lasting one one minute. 6. SUPPLEMENTARY
TESTS
6.0 If at any time during the test, there is any doubt as to the presence of exposed base metal, as determined by visual inspection, one or more of the tests given in 6.1 or 6.2 may be used. 6.1 Supplementary Tests for All Types of Zinc Coatings 6.1.1
icrosco icroscopic pic
est
Section
the
test
piece
through
the copper
IS : 2633 - 1986
APPENDIX Clause Claus e PP LICATION LICATION
OF
PRE ECE
GALVASIZED
A 0.3 TE ST
TO
WEATHE WEATHE RED
WARE
Precce test is not applicable to ag,ed or weathered weather ed material because of the corrosion iilm iilm present on zinc contmg. If it is desired to use the P r e e c e material, the corrosion iilm iilm should be removed before testing, telt on such by immcrLide ( sp gr 0.90 to 9 parts by volume volume of distilled water wate r 1, rinsing them in clean water wate r and wiping them dry. A-l.
IS : 2633 - 1986
Mmbers
Rrpresetrtitrg
Guest, Keen, Willlams Ltd. Howra VIIAY KAPOOR The Indian Steel 6r Wire Products Products Ltd, Jhmshedpur S H R I R . C. M AH AH A J S H R I A V T A R SINGH ( Alternote ) Steel Authority of India Ltd (Rourkela Steel Plant ), $4~1 B. MAHAPA~RA Rourkela S H R I S. N. S I W H A ( Alternate ) Directorate General of Technical Development, Develop ment, New S H R I S . ~~.~JLI~~DAR Delhi DEVELOPMENT OFFICER (HME) SHRI
( Alternate
SHR I M.
S.
MEHT
SIIRI P. G. MUKH~RJEE SHRI K. ~~ITRA Alrwxaie ) T. MLWH~RJEE S H R I S. NEELAKANTAX SHRI B. A. DEW ( Alrertrrrre Alrertrrrre
General Engineering Posts & Telegraphs
Works, Bharatpur, Rajasthan Departmenr, Calcutta
Tata Iron & Steel Co Ltd. Jamshedpur Zemth Steel Pipes Ltd. Bombay
BUREAU
OF INDIAN STANDARDS
Headquamrs Mar& Bhavan, 9 Bahadur Shah Zafar Marg, NEW DELHI 110002 Telephones: 323 0131,323 3375,323 9402 Fax 91 11 3234062,91 11 3239399, 91 11 3239382 Telegrams Manaksanstha (Common to all all Dffices) Dffices) Telephone Central Laboratory Plot No. 20/9, Site IV, Sahibabad Industrial Area, Area, Sahibabad 201010 Regional Central *Eastern
Oftices: Manak Bhavan, 9 Bahadur Shah Zafar Marg, Ma rg, NEW DELHI 110002 1114 CIT Scheme VII M, V.I.P. Road, Maniktola, CALCLRTA CALCLRTA 700054
Northern : SC0 335-336, Southern
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160022 600113
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32376
17
337 86 62 60 36 43 2352315 832 92 95
TO
‘2.2.3
