Environmental testing - Part 2-52: Tests - Test Kb: Salt mist, cyclic (sodium chloride solution)

IEC 60068-2-52:2017 is now available as IEC 60068-2-52:2017 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60068-2-52:2017 specifies the application of the cyclic salt mist test to components or equipment designed to withstand a salt-laden atmosphere as salt can degrade the performance of parts manufactured using metallic and/or non-metallic materials. This third edition cancels and replaces the second edition published in 1996. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- the entire content has been harmonized with ISO 9227 as far as possible;
- an introduction has been added;
- the scope has been simplified;
- normative references have been updated;
- the general description of the test has been changed;
- a dry chamber has been added to the test apparatus;
- severities have been changed to test methods;
- test methods 7 and 8 have been added;
- information on the test report has been added;
- Figure 1 has been changed to Table 1;
- a typical test apparatus example has been added in a new Annex A;
- a description of each test method has been added in a new Annex B;
- bibliographical references have been added.
This bilingual version (2019-07) corresponds to the monolingual English version, published in 2017-11.
The French version of this standard has not been voted upon.

Essais d'environnement - Partie 2-52: Essais - Essai Kb: Brouillard salin, essai cyclique (solution de chlorure de sodium)

L'IEC 60068-2-52:2017 spécifie l'application de l'essai cyclique au brouillard salin aux composants ou équipements conçus pour résister à une atmosphère chargée en sel, car le sel peut détériorer le fonctionnement des parties fabriquées à partir de matériaux métalliques et/ou non métalliques.
Cette troisième édition annule et remplace la deuxième édition parue en 1996. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- le contenu a été harmonisé autant que possible avec l'ISO 9227;
- une introduction a été ajoutée;
- le domaine d'application a été simplifié;
- les références normatives ont été mises à jour;
- la description générale de l'essai a été modifiée;
- une chambre sèche a été ajoutée à l'appareillage d'essai;
- les sévérités ont été remplacées par les méthodes d'essai;
- les méthodes d'essai 7 et 8 ont été ajoutées;
- des informations sur le rapport d'essai ont été ajoutées;
- la Figure 1 a été remplacée par le Tableau 1;
- un exemple d'appareillage d'essai type a été ajouté à la nouvelle Annexe A;
- une description de chaque méthode d'essai a été ajoutée à la nouvelle Annexe B;
- des références bibliographiques ont été ajoutées.
La présente version bilingue (2019-07) correspond à la version anglaise monolingue publiée en 2017-11.
La version française de cette norme n'a pas été soumise au vote.

General Information

Status
Published
Publication Date
06-Nov-2017
Current Stage
PPUB - Publication issued
Completion Date
07-Nov-2017
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IEC 60068-2-52
Edition 3.0 2017-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-52: Tests – Test Kb: Salt mist, cyclic (sodium chloride solution)
Essais d'environnement –
Partie 2-52: Essais – Essai Kb: Brouillard salin, essai cyclique (solution de
chlorure de sodium)
IEC 60068-2-52:2017-11((en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60068-2-52
Edition 3.0 2017-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-52: Tests – Test Kb: Salt mist, cyclic (sodium chloride solution)
Essais d'environnement –
Partie 2-52: Essais – Essai Kb: Brouillard salin, essai cyclique (solution de
chlorure de sodium)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040 ISBN 978-2-8322-7231-2

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60068-2-52:2017 © IEC 2017
CONTENTS

CONTENTS ............................................................................................................................ 2

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 7

4 General description of the test ......................................................................................... 7

4.1 Description of each test condition ........................................................................... 7

4.1.1 General ........................................................................................................... 7

4.1.2 Salt mist .......................................................................................................... 8

4.1.3 Dry condition ................................................................................................... 8

4.1.4 Humid condition ............................................................................................... 8

4.1.5 Standard atmosphere ...................................................................................... 8

5 Test apparatus ................................................................................................................ 8

5.1 General ................................................................................................................... 8

5.2 Salt mist chamber ................................................................................................... 8

5.3 Humidity chamber ................................................................................................... 8

5.4 Standard atmosphere chamber ............................................................................... 9

5.5 Dry chamber ........................................................................................................... 9

6 Salt solution .................................................................................................................... 9

6.1 Preparation of the sodium chloride solution ............................................................. 9

6.2 pH adjustment ......................................................................................................... 9

6.2.1 Neutral salt solution ......................................................................................... 9

6.2.2 Acidified salt solution ....................................................................................... 9

6.3 Filtration ................................................................................................................. 9

7 Initial measurements ....................................................................................................... 9

8 Preconditioning ................................................................................................................ 9

9 Testing ............................................................................................................................ 9

9.1 Test chamber .......................................................................................................... 9

9.2 Arrangement of the test specimen(s) ..................................................................... 10

9.3 Conditions during salt mist .................................................................................... 10

9.4 Test methods ........................................................................................................ 10

9.4.1 General ......................................................................................................... 10

9.4.2 Test method 1 ............................................................................................... 10

9.4.3 Test method 2 ............................................................................................... 10

9.4.4 Test method 3 ............................................................................................... 10

9.4.5 Test method 4 ............................................................................................... 11

9.4.6 Test method 5 ............................................................................................... 11

9.4.7 Test method 6 ............................................................................................... 11

9.4.8 Test method 7 ............................................................................................... 11

9.4.9 Test method 8 ............................................................................................... 11

9.5 Test cycles for test methods 1 to 8 ........................................................................ 11

9.6 Removal of the test specimen(s) ........................................................................... 12

10 Recovery (at the end of testing) ..................................................................................... 12

11 Final measurements ...................................................................................................... 13

---------------------- Page: 4 ----------------------
IEC 60068-2-52:2017 © IEC 2017 – 3 –

12 Information to be given in the relevant specification ....................................................... 13

13 Information to be given in the test report........................................................................ 13

Annex A (informative) Typical apparatus for cyclic salt mist, humid condition, dry

condition and standard atmosphere corrosion tests ....................................................... 14

Annex B (informative) Description of each test method ........................................................ 15

B.1 Test methods 1 and 2 ........................................................................................... 15

B.2 Test methods 3 to 6 .............................................................................................. 15

B.3 Test methods 7 and 8 ........................................................................................... 15

Bibliography .......................................................................................................................... 16

Figure A.1 – Example of test apparatus ................................................................................ 14

Table 1 – Test cycles for test methods 1 to 8 ........................................................................ 12

---------------------- Page: 5 ----------------------
– 4 – IEC 60068-2-52:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 2-52: Tests – Test Kb: Salt mist, cyclic
(sodium chloride solution)
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

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with the International Organization for Standardization (ISO) in accordance with conditions determined by

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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

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indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60068-2-52 has been prepared by IEC technical committee 104:

Environmental conditions, classification and methods of test.

This bilingual version (2019-07) corresponds to the monolingual English version, published in

2017-11.

This third edition cancels and replaces the second edition published in 1996. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) the entire content has been harmonized with ISO 9227 as far as possible;
b) an introduction has been added;
---------------------- Page: 6 ----------------------
IEC 60068-2-52:2017 © IEC 2017 – 5 –
c) the scope has been simplified;
d) normative references have been updated;
e) the general description of the test has been changed;
f) a dry chamber has been added to the test apparatus;
g) severities have been changed to test methods;
h) test methods 7 and 8 have been added;
i) information on the test report has been added;
j) Figure 1 has been changed to Table 1;
k) a typical test apparatus example has been added in a new Annex A;
l) a description of each test method has been added in a new Annex B;
m) bibliographical references have been added.
The text of this International Standard is based on the following documents:
FDIS Report on voting
104/751/FDIS 104/761/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.
The French version of this standard has not been voted upon.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 60068 series, published under the general title Environmental

testing, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 7 ----------------------
– 6 – IEC 60068-2-52:2017 © IEC 2017
INTRODUCTION

The mechanism of corrosion on metallic materials in a chloride-containing atmosphere is

electrochemical, whereas the degradation effects experienced on non-metallic materials are

caused by complex chemical reactions of the salts with the materials involved. The rate at

which corrosive action takes place is dependent, to a large extent, on the supply of

oxygenated salt solution to the surface of the test specimen(s), the temperature of the test

specimen(s) and the temperature and humidity of the environment.

Apart from the corrosive effects, this cyclic salt mist test may be used to indicate deterioration

of some non-metallic materials by assimilation of salts. In the various test methods described

in this document, the period of spraying with the relevant salt solution is sufficient to wet the

test specimen(s) thoroughly. Because this wetting is repeated after intervals of storage under

humid conditions supplemented by storage under a standard atmosphere, it goes some way

to reproducing the effects of natural environments.

Furthermore, considering natural environments for corrosion on metallic materials, neutral or

acidified salt solution spray, humid, and dry conditions are also important factors as a cyclic

corrosion test. Each condition is repeated after intervals of other conditions in different

combinations to achieve corrosion on metallic materials and to get acceleration of corrosion.

The tests described in this document are accelerated compared with most expected

conditions of use. As a result, it may be difficult to establish an overall acceleration factor for

all kinds of test specimens. This also means that it is often not possible to use results gained

from these tests as a comparative guide to the long-term behaviour of different coating

systems since the corrosion stress during these tests differs significantly from the corrosion

stresses encountered during use. Nevertheless, the method described gives a means of

checking that the comparative quality of a metallic material is maintained.

This document may involve hazardous materials, operations and equipment. This document

does not purport to address all of the safety concerns, if any, associated with its use. It is the

responsibility of the user of this document to establish appropriate safety and health practices

and determine the applicability of regulatory limitations prior to use.
---------------------- Page: 8 ----------------------
IEC 60068-2-52:2017 © IEC 2017 – 7 –
ENVIRONMENTAL TESTING –
Part 2-52: Tests – Test Kb: Salt mist, cyclic
(sodium chloride solution)
1 Scope

This part of IEC 60068-2 specifies the application of the cyclic salt mist test to components or

equipment designed to withstand a salt-laden atmosphere as salt can degrade the
performance of parts manufactured using metallic and/or non-metallic materials.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.
IEC 60068-1, Environmental testing – Part 1: General and guidance

IEC 60068-2-78, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady

state
ISO 9227, Corrosion tests in artificial atmospheres – Salt spray tests
3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 General description of the test
4.1 Description of each test condition
4.1.1 General

This document consists of the cyclic test conditions of salt mist, dry condition, humid condition

and standard atmosphere. The effect of each test condition is as follows.
NOTE Salt mist is also called salt spray.
The test specimen(s) is typically not energized during the test.
---------------------- Page: 9 ----------------------
– 8 – IEC 60068-2-52:2017 © IEC 2017
4.1.2 Salt mist

The test specimen is corroded by an electrochemical or complex chemical reaction with

neutral or acidified salt solution. Salt solution forms a thin electrolytic film on the test

specimen surface. This can initiate corrosion and can allow it to proceed.
4.1.3 Dry condition

Heated air in the chamber may cause evaporation of water from the test specimen surface

from decreasing relative humidity and increased specimen temperature. This causes the

concentration of the solution to increase and speeds up chemical reactions, accelerating the

corrosion process. Salt precipitates out of the solution onto the test specimen surface during

this condition. Evaporation and heating rates may vary based on the test chamber and test

specimen.
4.1.4 Humid condition
4.1.4.1 Dry condition to humid condition

As the relative humidity increases, precipitated salt crystals on the specimen surface absorb

water vapour until a liquid electrolytic solution forms, reinitializing the corrosion process.

4.1.4.2 Salt mist to humid condition

The humid condition maintains the existing wetness on the test specimen surface at the end

of the salt mist period, without excessive dilution of the solution that may result from

condensing humidity.
4.1.5 Standard atmosphere

The test specimen is allowed to equilibrate with standard laboratory conditions, which results

in gradual drying and relaxation from most corrosion reactions. The period of dry atmosphere

may occur, in practice, during breaks of operation, for example during the weekend. The

inclusion of such a dry period may lead to corrosion mechanisms which can be quite different

from those under constant wet conditions. The test schedule shall be chosen in order to

respect the timelines given in 9.4. Additional dry periods (e.g. during a weekend) shall be

avoided.
5 Test apparatus
5.1 General

Each test method includes two or more environmental conditions, which may be achieved by

the use of multiple chambers or a single chamber that automatically transitions from one

condition to the next. In either case, transitions are not assumed to be instantaneous. Care

shall be taken to minimize any adverse effects associated with handling of specimens during

transfer between chambers.
5.2 Salt mist chamber

The chamber shall conform to the requirements of ISO 9227. It shall maintain a temperature

of 35 °C ± 2 K.

NOTE A schematic diagram of one possible design of spray cabinet is shown in Annex A.

5.3 Humidity chamber

The chamber shall conform to the requirements of IEC 60068-2-78. It shall maintain a relative

humidity of 93 % ± 3 % at a temperature of 40 °C ± 2 K or a relative humidity of over 95 % at

a temperature of 50 °C ± 2 K.
---------------------- Page: 10 ----------------------
IEC 60068-2-52:2017 © IEC 2017 – 9 –
5.4 Standard atmosphere chamber

The chamber shall conform to the requirements of IEC 60068-1. It shall maintain a relative

humidity of 50 % ± 5 % at a temperature of 23 °C ± 2 K.
5.5 Dry chamber

The chamber shall maintain a relative humidity of less than 30 % at a temperature of 60

°C ± 2 K.
6 Salt solution
6.1 Preparation of the sodium chloride solution
The solution shall conform to the requirements of ISO 9227.

NOTE The sodium chloride concentration of the sprayed solution collected is 50 g/l ± 5 g/l.

6.2 pH adjustment
6.2.1 Neutral salt solution

The pH adjustment shall conform to the requirements of ISO 9227 for the neutral salt solution

test.
6.2.2 Acidified salt solution

Add the following reagents to 10 litres of the prepared neutral 5 % sodium chloride solution as

follows: 12 ml of nitric acid (HNO , ρ = 1,42 g/ml), 17,3 ml of sulfuric acid (H SO , ρ = 1,84

3 2 4

g/ml) and sufficient quantity of 10 % mass fraction of sodium hydroxide (NaOH) solution to

adjust the pH of the solution to 3,5 ± 0,1 (about 300 ml will be required). The pH of the

sprayed solution collected within the chamber is 3,4 to 3,6 at 25 °C ± 2 K.
6.3 Filtration

If necessary, filter the solution before placing it in the reservoir of the apparatus to remove

any solid matter which might block the apertures of the spraying device.
7 Initial measurements

The test specimen(s) shall be visually inspected and, if necessary, electrically and

mechanically checked as required by the relevant specification.
8 Preconditioning

The relevant specification shall specify the cleaning procedure to be applied immediately

before the test; it shall also state whether temporary protective coatings shall be removed.

The cleaning method used should not interfere with the effect of the salt mist on the test

specimen(s), nor introduce any secondary corrosion. Touching of the test surfaces by hand

should be avoided as far as possible before the test.
9 Testing
9.1 Test chamber
For test methods 1 and 2, a salt mist chamber and humidity chamber are used.
---------------------- Page: 11 ----------------------
– 10 – IEC 60068-2-52:2017 © IEC 2017

For test methods 3 to 6, a salt mist chamber, humidity chamber and standard atmosphere

chamber are used.

For test methods 7 and 8, a salt mist chamber, dry chamber and humidity chamber are used.

All test methods may be performed in a single chamber provided it is capable of maintaining

the required conditions. If not, care should be taken to avoid loss of salt solution deposits on

the test specimen(s) and to avoid any damage to the test specimen(s) due to manual

handling. For test methods 7 and 8, each condition should be carried out in the same

chamber due to the difficulty in achieving the rapid drying and re-wetting intended if

specimens are manually moved from one chamber to another.

It is recommended to use a specific chamber for testing test method 8 exclusively. Cross

effects of remaining acidified salt solution when consequently using test method 1 to 7 cannot

be ignored.
9.2 Arrangement of the test specimen(s)
The arrangement shall conform to the requirements of ISO 9227.
9.3 Conditions during salt mist
The test conditions shall conform to the requirements of ISO 9227.
9.4 Test methods
9.4.1 General

The relevant specification shall indicate which of the eight following test methods shall be

used. A description of each test method is given in Annex B. When not specified, the test

method shall be agreed by the interested parties.
The user should be aware of mass loss for each test condition.
9.4.2 Test method 1

One cycle is seven days. One cycle shall consist of spraying the specimen with a salt solution

at 35 °C ± 2 K for 2 h, followed by the humid condition at 40 °C ± 2 K, 93 % ± 3 % RH for six

days and 22 h. The required number of cycles is four
...

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