SIST EN ISO 3613:1999

Chromate conversion coatings on zinc and cadmium - Test methods (ISO 3613:1980)

Chromatierüberzüge auf Zink und Cadmium - Prüfverfahren (ISO 3613:1980)

Diese Internationale Norm gibt Methoden an, um auf Zink und Cadmium folgendes zu bestimmen: - die Anwesenheit farbloser Chromatierüberzüge; - die Anwesenheit und Menge von sechswertigem Chrom in farblosen und farbigen Überzügen; - den Gesamtchromgehalt pro Flächeneinheit; - die befriedigende Haftfestigkeit farbiger Überzüge.

Couches de conversion au chromate sur zinc et cadmium - Méthodes d'essai (ISO 3613:1980)

S kromatenjem nanesene plasti na cinku in kadmiju – Metode preskušanja (ISO 3613:1980)

General Information

• Status: Withdrawn
• Publication Date: 30-Sep-1999
• Withdrawal Date: 28-Feb-2002
• ICS: 25.220.20 - Surface treatment
• Technical Committee: IPKZ - Protection of metals against corrosion
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 01-Mar-2002
• Due Date: 01-Mar-2002
• Completion Date: 01-Mar-2002
• Ref Project: EN ISO 3613:1994 - Chromate conversion coatings on zinc and cadmium - Test methods (ISO 3613:1980)

Relations

• Replaced By: SIST EN ISO 3613:2002 - Chromate conversion coatings on zinc, cadmium, aluminium-zinc alloys and zinc-aluminium alloys - Test methods (ISO 3613:2000)
• Effective Date: 01-Mar-2002

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 3613:1999
01-oktober-1999
S kromatenjem nanesene plasti na cinku in kadmiju – Metode preskušanja (ISO
3613:1980)
Chromate conversion coatings on zinc and cadmium - Test methods (ISO 3613:1980)
Chromatierüberzüge auf Zink und Cadmium - Prüfverfahren (ISO 3613:1980)
Couches de conversion au chromate sur zinc et cadmium - Méthodes d'essai (ISO
3613:1980)
Ta slovenski standard je istoveten z: EN ISO 3613:1994
ICS:
25.220.20 Površinska obdelava Surface treatment
SIST EN ISO 3613:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 3613:1999

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SIST EN ISO 3613:1999

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SIST EN ISO 3613:1999

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SIST EN ISO 3613:1999

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SIST EN ISO 3613:1999

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SIST EN ISO 3613:1999
International Standard
INTERNATIONAL ORGANIZATION FOR STANDARDlZATlON.ME~YHAPO)JHAR OPTAHM3AUMR f-l0 CTAH~APTH3A~Wl.ORGANlSATlON INTERNATIONALE DE NORMALISATION
Chromate conversion coatings on zinc and cadmium -
Test methods
Couches de conversion au chromate SW zinc et cadmium - M&hodes d ’essai
First edition - 1980-09-01
UDC 669.58 + 669.738: 620.19 Ref. No. IS0 36134980 (E)
Descriptors : non-metallic coatings, conversion coatings, chromate coatings, tests, chemical tests.
Price based on 4 pages

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SIST EN ISO 3613:1999
Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards institutes (IS0 member bodies). The work of developing Inter-
national Standards is carried out through IS0 technical committees. Every member
body interested in a subject for which a technical committee has been set up has the
right to be represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council.
International Standard IS0 3613 was developed by Technical Committee ISO/TC 107,
Metallic and other non-organic coatings, and was circulated to the member bodies in
August 1977.
It has been approved by the member bodies of the following countries :
Australia Israel South Africa, Rep. of
Austria Italy Spain
Brazil Japan Sweden
Czechoslovakia Mexico Switzerland
France Netherlands United Kingdom
Germany, F. R. New Zealand USA
Hungary Philippines USSR
India Romania
The member body of the following country expressed disapproval of the document on
technical grounds
Poland
International Organization for Standardization, 1980 0
0
Printed in Switzerland

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SIST EN ISO 3613:1999
IS0 36134980 (E)
INTERNATIONAL STANDARD
Chromate conversion coatings on zinc and cadmium -
Test methods
3.1 Test for presence of a colourless chromate
1 Scope and field of application
coating
This International Standard specifies methods for the deter-
mination on zinc and cadmium of :
3.1 .l Test solution
-
the presence of colourlessl) chromate conversion
Dissolve 50 g of lead acetate trihydrate [KH~COO)~Pb.3H~Ol
coatings;
in 1 litre of distilled or deionized water. The pH of the solution
shall be between 5,5 and 6,8.
-
the presence and quantity of hexavalent chromium in
colourless and coloured coatings;
Any white precipitate formed during the initial preparation of
the solution may be dissolved by small additions of acetic acid,
-
the total chromium content per unit area;
provided that the pH is not reduced to a value below 5,5.
Discard the solution as soon as a white precipitate forms.
-
the satisfactory adhesion of coloured coatings.
These methods are applicable only to chromate conversion
3.1.2 Procedure
coatings which are free from any supplementary coating, such
as oil, water or solvent-based polymers, or wax. Place 1 drop of the lead acetate solution (3.1 .l) on the surface
to be tested.
A method for the determination of mass pei unit area of both
colourless and coloured chromate conversion coatings and for In the case of a zinc substrate, observe the spot for 3 min. The
the neutral salt spray test are specified in IS0 3892 and presence of a colourless chromate conversion coating will be
IS0 3768 respectively and are listed in 3.5 and 3.7 for com- indicated when the formation of a dark or black stain is delayed
pleteness. by at least 1 min after application of the test solution. Delay of
black stain formation by more than 3 min may be indicative of
supplementary coatings, such as wax or oil (see note).
2 References
In the case of a cadmium substrate, observe the spot for 1 min.
IS0 3768, Metallic coatings - Neutral salt spray test (NSS The presence of a colourless chromate conversion coating will
test). be indicated when the formation of a dark or black stain is
’
delayed by at least 6 s. Delay of black stain formation by more
IS0 3892, Conversion coatings on metallic materials - Deter- than 1 min may be indicative of supplementary coatings, such
mination of coating mass per unit area - Gravimetric as wax or oil.
method&
Zinc and cadmium surfaces which have not been treated with a
chromate conversion coating wilt react with the lead acetate
3 Test methods solution to form a black stain within 2 to 5 s.
The tests shall be carried out within the following time limits : No significance should be placed upon any differences in reac-
tion time to black spot formation between 1 and 3 min on a zinc
-
minimum 24 h after the application of the chromate substrate with colourless chromate conversion treatment, or
conversion coating for all tests (3.1 to 3.7); between 6 to 60 s on a cadmium substrate with colourless
chromate conversion treatment. Factors such as substrate sur-
-
maximum 3 days for tests specified in 3.1 and 3.23); face texture (roughness), chromate film thickness variations
(due to processing conditions), variations in the ambient
- maximum 30 days for tests specified in 3.1 and 3.4
temperature of the test,, and precise pH control of the lead
1) The application of very thin, colourless, practially invisible chromate conversion coatings is frequently called “passivation ”, while the application
of thicker, coloured chromate conversion coatings is often called “chromating ”.
The term “passivation” is deprecated.
2) At present at the stage of draft.
3) This may require that special arrangements be made between the purchaser and supplier.

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SIST EN ISO 3613:1999
IS0 3613-1980 (E)
acetate solution have an influence on the reaction time, and 3.3.1.4 Phosphate, buffer solution.
therefore preclude any rating based upon times beyond those
already stated. Similarly, the test cannot be used to compare of sodium dihydrogen orthophosphate
Dissolve 55 g
various types of chromate treatment solutions. monohydrate (NaH2P04.H20) in 100 ml of water.
NOTE - Chromate conversion coatings which have lost their protec-
3.3.2 Apparatus
tive value through dehydration by exposure to temperatures higher
than 60 OC will form black stain in less than 60 s on zinc, and less than
5 s on cadmium.
Ordinary laboratory apparatus and
absorptiometer (calorimeter) or
3.3.2.1 Photoelectric
3.2 Test for presence of hexavalent chromium in
spectrophotometer.
both colourless and coloured chromate coatings
With a photoelectric absorptiometer, use a filter having a mean
transmission of 520 nm. A wavelength of 540 nm shall be set
3.2.1 Test solution
for a spectrophotometer. Use an absorption cell with an optical
path length of 1 cm in both cases.
Dissolve 0,4 g of diphenylcarbazide in a mixture of 20 ml of
acetone and 20 ml of ethanol. After dissolution, add 20 ml of
75 % orthophosphoric acid solution and 20 ml of distilled
3.3.3 Procedure
water. Prepare this solution not more than 8 h prior to use.
3.3.3.1 Preparation of calibration graph
3.2.2 Procedure
To a series of five 250 ml volumetric flasks, add respectively 0
Place 1 to 5 drops of the test solution (3.2.1) on the surface to
-10 - 20 - 30 and 40 ml of the standard potassium dichromate
be tested. If hexavalent chromium is present, a red to violet col-
solution (3.3.1.3). Add to each flask 100 ml of water and 3 ml
our will appear within a few minutes. Ignore any coiour which
of the sulphuric acid
...