Corrosion of metals and alloys - Alternate immersion test in salt solution (ISO 11130:1999)

Migrated from Progress Sheet (TC Comment) (2000-07-10): Crash 1996: //voting not been started yet by the ISO committee ++ N 201: New TD (980917)

Korrosion von Metallen und Legierungen - Wechseltauchprüfung in Salzlösung (ISO 11130:1999)

Zweck dieser Norm ist die Festlegung eines Verfahrens zur Beurteilung der Korrosionsbeständigkeit von Metallen mit Hilfe einer Wechseltauchprüfung in Salzlösung, mit oder ohne Beanspruchung. Die Prüfung ist besonders als Prüfung zur Qualitätslenkung bei der Herstellung von Metallen (einschließlich Aluminiumlegierungen und Eisenwerkstoffen) sowie bei der Entwicklung von Legierungen für Bewertungßwecke geeignet.

Corrosion des métaux et alliages - Essai en immersions alternées en solution saline (ISO 11130:1999)

La CEI 60747-16-4:2004+A1:2009 fournit de nouvelles méthodes de mesure, la terminologie et les symboles littéraux, ainsi que les valeurs assignées et caractéristiques essentielles pour les commutateurs hyperfréquences à circuits intégrés. Il existe de nombreuses combinaisons pour les ports RF des commutateurs, par exemple les commutateurs unipolaires unidirectionnels (SPST: Single Pole Single Throw), les commutateurs unipolaires bidirectionnels (SPDT: Single Pole Double Throw), les commutateurs unipolaires tridirectionnels (SP3T: Single Pole Triple Throw), les commutateurs bipolaires bidirectionnels (DPDT: Double Pole Double Throw), etc. Les commutateurs de la présente Norme sont basés sur les commutateurs unipolaires bidirectionnels (SPDT). Toutefois, la présente Norme est applicable aux autres types de commutateurs.
Cette version consolidée comprend la première édition (2004) et
son amendement 1 (2009). Il n'est donc pas nécessaire de commander
l'amendement avec cette publication.

Korozija kovin in zlitin - Preskus z izmeničnim potapljanjem v raztopinah soli (ISO 11130:1999)

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Corrosion of metals and alloys - Alternate immersion test in salt solution (ISO
Korrosion von Metallen und Legierungen - Wechseltauchprüfung in Salzlösung (ISO

Corrosion des métaux et alliages - Essai en immersions alternées en solution saline (ISO

Ta slovenski standard je istoveten z: EN ISO 11130:1999
77.060 Korozija kovin Corrosion of metals
SIST EN ISO 11130:2000 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 11130:2000
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SIST EN ISO 11130:2000
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SIST EN ISO 11130:2000
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SIST EN ISO 11130:2000
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SIST EN ISO 11130:2000
First edition
Corrosion of metals and alloys — Alternate
immersion test in salt solution
Corrosion des métaux et alliages — Essai en immersions alternées
en solution saline
Reference number
ISO 11130:1999(E)
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SIST EN ISO 11130:2000
ISO 11130:1999(E)

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO

member bodies). The work of preparing International Standards is normally carried out through ISO technical

committees. Each member body interested in a subject for which a technical committee has been established 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. ISO collaborates closely with the International Electrotechnical

Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.

Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.

Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

International Standard ISO 11130 was prepared by Technical committee ISO/TC 156, Corrosion of metals and

Annexes A and B of this International Standard are for information only.
© ISO 1999

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic

or mechanical, including photocopying and microfilm, without permission in writing from the publisher.

International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Printed in Switzerland
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SIST EN ISO 11130:2000
ISO iii
ISO 11130:1999(E)

Corrosion of metals is influenced by factors which may vary significantly with environmental conditions. Therefore,

corrosion resistance determined for metals during alternate immersion testing described in this International

Standard may vary greatly with the test solution selected, the temperature during immersion and the temperature

and humidity during the drying periods of test.

Consequently, the result of an alternate immersion corrosion test should not be taken as indicative of the corrosion

resistance of metal tested in all the different service environments in which the metal may be used.

Nevertheless, results obtained by the method described in this International Standard may indicate the relative

corrosion resistance of different metals under in-service conditions, particularly when the service environment is

similar to the test solution selected. The method may also be used to test metals under an applied tensile stress.

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SIST EN ISO 11130:2000
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SIST EN ISO 11130:2000
Corrosion of metals and alloys — Alternate immersion test in salt
1 Scope

The purpose of this International Standard is to define a method of assessing the corrosion resistance of metals by

an alternate immersion test in salt solution, with or without applied stress.

The test is particularly suitable for quality control during the manufacture of metals including aluminium alloys and

ferrous materials, and also for assessment purposes during alloy development.

Depending upon the chemical composition of the test solution, the test may be used to simulate the corrosive

effects of marine splash zones, de-icing fluids and acid salt environments.

The term "metal" as used in this International Standard includes metallic materials with or without corrosion

The alternate immersion test applies to:
 metals and their alloys;
 certain metallic coatings (anodic and cathodic with respect to the substrate);
 certain conversion coatings;
 certain anodic oxide coatings;
 organic coatings on metals.
2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions of

this International Standard. For dated references, subsequent amendments to, or revisions of, any of these

publications do not apply. However, parties to agreements based on this International Standard are encouraged to

investigate the possibility of applying the most recent editions of the normative documents indicated below. For

undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC

maintain registers of currently valid International Standards.

ISO 1462:1973, Metallic coatings — Coatings other than those anodic to the basis metal — Accelerated corrosion

tests — Method for the evaluation of the results.

ISO 4540:1980, Metallic coatings — Coatings cathodic to the substrate — Rating of electroplated test specimens

subjected to corrosion tests.

ISO 7539-1:1987, Corrosion of metals and alloys — Stress corrosion testing — Part 1: General guidance on testing

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SIST EN ISO 11130:2000
ISO 11130:1999(E)

ISO 8407:1991, Corrosion of metals and alloys — Removal of corrosion products from corrosion test specimens.

3 Principle

The test consists of immersion of a test specimen, stressed (see ISO 7539-1) or unstressed, in a salt solution,

followed by withdrawal and a period of drying.

The immersion/drying cycle is repeated at a given frequency for a given period. The extent of attack is then

evaluated. For many materials, this provides a more severe corrosion test than simple continuous immersion.

4 Test solution
4.1 General

The test solution shall be prepared using reagent grade chemicals conforming to the prescribed specification.

Otherwise, the solution used should be the one most appropriate to the intended service conditions. Subclause 4.2

gives details of a neutral salt solution that is suitable for simulating the corrosive effect of a marine environment.

Details of three other test solutions suitable for simulating salt-based de-icing liquid, acid salt conditions and ocean

water are given in annex A.
4.2 Preparation

The neutral salt solution is prepared by dissolving a sufficient mass of sodium chloride in distilled or deionized water

to give a concentration of 35 g/l ± 1 g/l. The distilled or de-ionized water used shall have a conductivity not higher

than 2 mS/m at 25 °C ± 2°C.

The maximum allowable impurity content in the sodium chloride solution shall be as follows:

Impurity Maximum permissible Remarks
% (m/m)
Copper 0,001 Determined by atomic
absorption spectrophotometry or
other method of similar accuracy
Nickel 0,001
Sodium iodide 0,1
Calculated for dry salt
Total 0,5

Prior to use, check the pH of the salt solution by means of electrometric measurement at 25 °C ± 2 °C or in routine

checks, with a short-range pH paper which can be read in increments of 0,3 pH units or less. If the pH value

determined is outside the range 6,0 to 7,0 adjustments shall be made by adding to the salt solution, diluted

hydrochloric acid or sodium hydroxide of analytical grade.

The volume of the test solution should be defined by the specification of the product. If no specification is available,

it is recommended that the volume should be not less than 3 l/dm of test specimen area.

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SIST EN ISO 11130:2000
ISO 11130:1999(E)
5 Apparatus
5.1 General
The apparatus shall include the following components:

 a suitable system designed for the automatic, continuous performance of complete cycles of alternate

immersion and withdrawal of the test specimens. This system shall provide uninterrupted operation throughout

the duration of the test (see 6.1). Each test specimen shall be connected to the system using suitable insulating


 one or more glass or plastic containers for the reagent. In the immersed position, only one kind of metal, alloy

or coating shall be immersed in each container. Replicate specimens can share the same container.

NOTE 1 The system should be designed such that the time taken for full immersion or withdrawal of each specimen is no

more than 2 min.

NOTE 2 Suitable apparatus for conducting alternate immersion tests is illustrated schematically in annex B.

5.2 Materials of construction

5.2.1 Materials of construction that come into contact with the test solution shall be such that they are not affected

by the corrodent to the extent that they can cause contamination of the solution and change its corrosivity.

5.2.2 Use of inert plastics or glass is recommended where feasible.

5.2.3 Metallic materials of construction shall be selected from alloys that are corrosion resistant to the test

environment or shall be protected with a suitable corrosion resistant coating that also satisfies the conditions given

in 5.2.1.
5.3 Test specimen holders

5.3.1 Test specimen holders shall be designed to electrically insulate the test specimens from each other and from

any other bare metal. When this is not possible, as in the case of certain stressing bolts or jigs, the bare metal in

contact with the specimen should be isolated from the corrodent by suitable insulating materials. If a protective

coating is used, it shall be of a type that will not leach inhibiting or accelerating ions or protective oils over the non-

coated portions of the specimen. In particular, coatings containing chromates shall be avoided.

5.3.2 The shape and form of test specimen supports and holders shall be such that:

 they avoid, as much as possible, any interference of free contact of the test specimen with the salt solution;

 they do not obstruct air flow over the test specimen thereby retarding the drying rate;

 they do not retain a pool of solution in contact with the test specimen after withdrawal from the solution;

 drainage from one test specimen does not directly contact any other test specimen.

5.4 Air circulation

5.4.1 Air circulation is recognized as an important factor because it affects both the rate at which test specimens

dry and the loss of water by evaporation. Optimum conditions for air circulation have not been established, but the

recommendations described in 5.4.2 should be followed.
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SIST EN ISO 11130:2000
ISO 11130:1999(E)

5.4.2 It is important to achieve moderate and uniform drying conditions. Mild circulation of air capable of drying

specimens within about 40 min, even when coated with corrosion products and salt deposits, is recommended with

the following precautionary considerations.

 Drying by forced air blasts on the test specimens is not recommended because of difficulty in maintaining

uniform drying of large groups of test specimens.
 Stagnant air conditions should be avoided.
 The air temperature should be 27 °C ± 1 °C unless otherwise specified.
 The relative humidity should be 45 % ± 6 % unless otherwise specified.
6 Procedure
6.1 Test conditions

Generally, the test conditions are prescribed in the agreed specifications. If this is not the case, the exposures

should involve 10 min immersion followed by withdrawal and 50 min drying. The cycle should be repeated

continuously throughout the duration of the test unless prior failure occurs.
The solution temperature should be 25 °C ± 2 °C unless otherwise specified.

Only one kind of metal, alloy or coating shall be immersed in the same container during a particular test.

NOTE Unless otherwise specified, the test duration shall be established on the basis of the susceptibility to corrosion of the

metal in the test solution and the purpose of the test. Test duration in the range 20 d to 90 d is usuall


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