Corrosion of metals and alloys - Corrosion in artificial atmosphere - Accelerated corrosion test involving exposure under controlled conditions of humidity cycling and intermittent spraying of a salt solution (ISO 16701:2015, Corrected version 2018-10)

ISO 16071:2015 specifies the test method, the reagents, and the procedure to be used in an accelerated atmospheric corrosion test constituting a 6 h exposure to a slightly acidified solution of 1 % NaCl twice weekly, followed by a condition of controlled humidity cycling between 95 % RH and 50 % RH at a constant temperature of 35 °C.
It does not specify the dimensions of the tests specimens, the exposure period to be used for a particular product, or the interpretation of the results. Such details are provided in the appropriate product specifications.
The accelerated laboratory corrosion test applies to metals and their alloys, metallic coatings (anodic or cathodic), chemical conversion coatings, and organic coatings on metallic materials.

Korrosion von Metallen und Legierungen - Korrosion in künstlicher Atmosphäre - Beschleunigte Korrosionsprüfungen unter zyklischer Einwirkung von Luftfeuchte und intermittierendem Versprühen einer Salzlösung unter kontrollierten Bedingungen (ISO 16701:2015, korrigierte Fassung 2018-10)

Diese Internationale Norm legt das Prüfverfahren, die Reagenzien und die Durchführung für eine beschleunigte atmosphärische Korrosionsprüfung fest; diese Prüfung besteht aus einer 6 stündigen Beanspruchung durch eine leicht gesäuerte Lösung von 1 % NaCl zwei Mal wöchentlich und einer anschließenden Phase mit kontrollierter Luftfeuchte zwischen 95 % relativer Luftfeuchte und 50 % relativer Luftfeuchte bei einer konstanten Temperatur von 35 °C.
Diese Internationale Norm legt keine Probekörpermaße, keine für ein spezielles Produkt anzuwendende Beanspruchungs¬dauer oder die Bewertung der Ergebnisse fest. Derartige Einzelheiten sind in den entsprechenden Produktspezifikationen enthalten.
Die beschleunigte Korrosionsprüfung im Laboratorium gilt für:
   Metalle und deren Legierungen;
   metallische Überzüge (anodische und kathodische);
   chemische Umwandlungsschichten und
   organische Beschichtungen auf metallischen Werkstoffen.
ANMERKUNG 1   Bei der Prüfung von niedriglegierten Stählen, besonders austenitischer Stähle, besteht nach dieser Internationalen Norm eine Gefahr von übermäßigem Lochfraß, der für die meisten Einsatzumgebungen nicht repräsentativ ist.
ANMERKUNG 2   Diese Internationale Norm ist aufgrund der konstant erhöhten Temperatur nicht geeignet für die Prüfung von wachs- und ölbasierten Rostschutzmitteln.

Corrosion des métaux et alliages - Corrosion en atmosphère artificielle - Essai de corrosion accélérée comprenant des expositions sous conditions contrôlées à des cycles d'humidité et à des vaporisations intermittentes de solution saline (ISO 16701:2015, Version corrigée 2018-10)

L'ISO 16701 :2015 spécifie la méthode d'essai, les réactifs et le mode opératoire à utiliser dans un essai de corrosion atmosphérique accélérée consistant en une exposition de 6 h, deux fois par semaine, à une solution légèrement acidifiée de 1 % de NaCl, suivie de cycles d'humidité contrôlés entre 95 % HR et 50 % de HR à une température constante de 35 °C.
La présente Norme internationale ne spécifie pas les dimensions des éprouvettes, la durée d'exposition à utiliser pour un produit donné, ni l'interprétation des résultats. De tels détails sont fournis dans les spécifications de produit appropriées.
L'essai de corrosion accélérée en laboratoire s'applique aux métaux et à leurs alliages, aux revêtements métalliques (anodiques ou cathodiques), aux revêtements de conversion chimique, et aux revêtements organiques sur des matériaux métalliques.

Korozija kovin in zlitin - Korozija v umetni atmosferi - Preskus pospešene korozije z izpostavljanjem nadzorovanim pogojem izmeničnega vlaženja in vmesnim pršenjem slanice (ISO 16701:2015)

Ta mednarodni standard določa preskusno metodo, reagente in postopek za izvajanje preskusa pospešene atmosferske korozije, ki zajema šesturno izpostavljenost rahlo nakisani raztopini 1 % NaCl dvakrat tedensko, ki mu sledi pogoj izmeničnega vlaženja med 95 % relativne vlažnosti in 50 % relativne vlažnosti pri stalni temperaturi 35 °C.
Ta mednarodni standard ne določa dimenzij preskušancev, časa izpostavljenosti za določen proizvod ali razlage rezultatov. Te podobnosti so navedene v ustreznih specifikacijah proizvodov.
Poskus pospešene laboratorijske korozije se uporablja za
– kovine in njihove zlitine,
– kovinske prevleke (anodne ali katodne),
– kemijsko-reakcijske prevleke in
– organske prevleke na kovinskih materialih.
OPOMBA 1: Če se preskušajo malolegirana nerjavna jekla, zlasti avstentitnih razredov, v skladu s tem mednarodnim standardom, obstaja tveganje za sprejem pretiranega jamičenja, ki ni reprezentativno za večino storitvenih okolij.
OPOMBA 2: Ta mednarodni standard ni ustrezen za preskušanje sredstev za zaščito proti rji na podlagi voska in olja, in sicer zaradi pogoja stalno dvignjene temperature v okviru preskusa.

General Information

Status
Published
Publication Date
26-May-2015
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
27-May-2015
Completion Date
27-May-2015

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SIST EN ISO 16701:2015
01-september-2015
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Corrosion of metals and alloys - Corrosion in artificial atmosphere - Accelerated

corrosion test involving exposure under controlled conditions of humidity cycling and

intermittent spraying of a salt solution (ISO 16701:2015)
Korrosion von Metallen und Legierungen - Korrosion in künstlicher Atmosphäre -
Beschleunigte Korrosionsprüfungen unter zyklischer Einwirkung von Feuchte und

intermittierendem Versprühen einer Salzlösung unter kontrollierten Bedingungen (ISO

16701:2015)

Corrosion des métaux et alliages - Corrosion en Atmosphäre artifizielle - Essai de

Korrosion accélérée comprenant des expositions sous conditions contrôlées à des
cycles d'humidité et à des vaporisations intermittentes de solution saline (ISO
16701:2015)
Ta slovenski standard je istoveten z: EN ISO 16701:2015
ICS:
77.060 Korozija kovin Corrosion of metals
SIST EN ISO 16701:2015 en,fr,de

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

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SIST EN ISO 16701:2015
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SIST EN ISO 16701:2015
EUROPEAN STANDARD
EN ISO 16701
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2015
ICS 77.060 Supersedes EN ISO 16701:2008
English Version
Corrosion of metals and alloys - Corrosion in artificial
atmosphere - Accelerated corrosion test involving exposure
under controlled conditions of humidity cycling and intermittent
spraying of a salt solution (ISO 16701:2015)

Corrosion des métaux et alliages - Corrosion en Korrosion von Metallen und Legierungen - Korrosion in

atmosphère artificielle - Essai de corrosion accélérée künstlicher Atmosphäre - Beschleunigte

comprenant des expositions sous conditions contrôlées à Korrosionsprüfungen unter zyklischer Einwirkung von

des cycles d'humidité et à des vaporisations intermittentes Feuchte und intermittierendem Versprühen einer

de solution saline (ISO 16701:2015) Salzlösung unter kontrollierten Bedingungen (ISO

16701:2015)
This European Standard was approved by CEN on 16 April 2015.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same

status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United

Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16701:2015 E

worldwide for CEN national Members.
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SIST EN ISO 16701:2015
EN ISO 16701:2015 (E)
Contents Page

Foreword ..............................................................................................................................................................3

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SIST EN ISO 16701:2015
EN ISO 16701:2015 (E)
Foreword

This document (EN ISO 16701:2015) has been prepared by Technical Committee ISO/TC 156 “Corrosion of

metals and alloys” in collaboration with Technical Committee CEN/TC 262 “Metallic and other inorganic

coatings” the secretariat of which is held by BSI.

This European Standard shall be given the status of a national standard, either by publication of an identical

text or by endorsement, at the latest by November 2015, and conflicting national standards shall be withdrawn

at the latest by November 2015.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 16701:2008.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech

Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,

Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,

Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

Endorsement notice

The text of ISO 16701:2015 has been approved by CEN as EN ISO 16701:2015 without any modification.

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SIST EN ISO 16701:2015
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SIST EN ISO 16701:2015
INTERNATIONAL ISO
STANDARD 16701
Second edition
2015-05-15
Corrosion of metals and alloys —
Corrosion in artificial atmosphere —
Accelerated corrosion test involving
exposure under controlled conditions
of humidity cycling and intermittent
spraying of a salt solution
Corrosion des métaux et alliages — Corrosion en atmosphère
artificielle — Essai de corrosion accélérée comprenant des
expositions sous conditions contrôlées à des cycles d’humidité et à des
vaporisations intermittentes de solution saline
Reference number
ISO 16701:2015(E)
ISO 2015
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SIST EN ISO 16701:2015
ISO 16701:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland

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

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
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SIST EN ISO 16701:2015
ISO 16701:2015(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Reagent ........................................................................................................................................................................................................................... 2

4 Apparatus ..................................................................................................................................................................................................................... 2

4.1 Climate chamber .................................................................................................................................................................................... 2

4.2 Spraying device ....................................................................................................................................................................................... 3

4.3 System for forced drying ................................................................................................................................................................ 3

5 Test objects ................................................................................................................................................................................................................. 3

6 Procedure..................................................................................................................................................................................................................... 4

6.1 Arrangement of the test objects ............................................................................................................................................... 4

6.2 Exposure conditions of test cycle ............................................................................................................................................ 4

6.3 Duration of test ....................................................................................................................................................................................... 6

6.4 Treatment of test objects after test ....................................................................................................................................... 6

7 Evaluation of results ......................................................................................................................................................................................... 6

8 Test report ................................................................................................................................................................................................................... 7

Annex A (informative) Recommended periods of testing............................................................................................................... 8

Annex B (informative) Suitable design of test apparatus with spraying device ......................................................9

Annex C (informative) Method for evaluation of corrosivity of test .................................................................................11

Bibliography .............................................................................................................................................................................................................................13

© ISO 2015 – All rights reserved iii
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SIST EN ISO 16701:2015
ISO 16701:2015(E)
Foreword

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.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers

to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 156, Corrosion of metals and alloys.

This second edition cancels and replaces the first edition (ISO 16701:2003), of which it constitutes a

minor revision.
iv © ISO 2015 – All rights reserved
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SIST EN ISO 16701:2015
ISO 16701:2015(E)
Introduction

Atmospheric corrosion of metallic materials, with or without corrosion protection, is influenced by

many environmental factors, the importance of which might vary with the type of metallic material

and with the type of environment. It is therefore not possible to design a laboratory corrosion test in

such a way that the full complexity of real in-service conditions are taken into account. Acceleration

(forced conditions) as such can also have a negative impact on the correlation to field performance.

Nevertheless, tests with humidity cycling and only intermittent exposure to salt solution will generally

provide a better correlation to field performance than tests using continuous salt spray.

This International Standard was developed in the automotive context, where the major contributor to

corrosion is the use of winter time de-icing road salt in cool/cold temperate areas around the world, here

as sodium chloride compounds acting in cyclic humidity conditions. The test procedure is moderately

forced by humidity and salt and intended to be applicable for quality assurance of the metals and

corrosion protections typically encountered in motor vehicles. The method can have relevance also

in other areas of application, provided representing similar climatic conditions with an influence of

sodium chloride compounds.
© ISO 2015 – All rights reserved v
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SIST EN ISO 16701:2015
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SIST EN ISO 16701:2015
INTERNATIONAL STANDARD ISO 16701:2015(E)
Corrosion of metals and alloys — Corrosion in artificial
atmosphere — Accelerated corrosion test involving
exposure under controlled conditions of humidity cycling
and intermittent spraying of a salt solution
1 Scope

This International Standard specifies the test method, the reagents, and the procedure to be used in an

accelerated atmospheric corrosion test constituting a 6 h exposure to a slightly acidified solution of 1 %

NaCl twice weekly, followed by a condition of controlled humidity cycling between 95 % RH and 50 %

RH at a constant temperature of 35 °C.

This International Standard does not specify the dimensions of the tests specimens, the exposure period

to be used for a particular product, or the interpretation of the results. Such details are provided in the

appropriate product specifications.
The accelerated laboratory corrosion test applies to
— metals and their alloys,
— metallic coatings (anodic or cathodic),
— chemical conversion coatings, and
— organic coatings on metallic materials.

NOTE 1 If testing low-alloy stainless steels, especially austenitic grades, according to this International

Standard, there is a risk of receiving exaggerated pitting, not representative for most service environments.

NOTE 2 This International Standard is not suitable for testing of wax and oil based rust protection agents, due

to the constantly elevated temperature condition of the test.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 4628-1, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity

and size of defects, and of intensity of uniform changes in appearance — Part 1: General introduction and

designation system

ISO 4628-2, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and

size of defects, and of intensity of uniform changes in appearance — Part 2: Assessment of degree of blistering

ISO 4628-4, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and

size of defects, and of intensity of uniform changes in appearance — Part 4: Assessment of degree of cracking

ISO 4628-5, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and

size of defects, and of intensity of uniform changes in appearance — Part 5: Assessment of degree of flaking

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

ISO 10289, Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates —

Rating of test specimens and manufactured articles subjected to corrosion tests
© ISO 2015 – All rights reserved 1
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SIST EN ISO 16701:2015
ISO 16701:2015(E)
3 Reagent

A salt solution, prepared by dissolving a sufficient mass of sodium chloride in distilled or deionized water

−1 −1

to a concentration of 10 g l ± 1 g l . The distilled or deionized water used shall have a conductivity not

higher than 2 mS m at 25 °C ± 2 °C.

The maximum permissible amounts of impurities in the sodium chloride are given in Table 1.

Table 1 — Maximum permissible amounts of impurities in the sodium chloride as calculated for

dry salt
Maximum mass
fraction of
Impurity Note
impurity
Copper (calculated for dry
0,001
salt)
Determined by atomic absorption spectro-photome-
try or other method with similar accuracy
Nickel (calculated for dry
0,001
salt)
Sodium iodide 0,1
Total 0,5

Check the pH of the salt solution by using potentiometric measurement at 25 °C ± 2 °C. Finely adjust the

pH of the salt solution to a value of 4,2 ± 0,1 by standard addition of a diluted sulphuric acid solution (e.g.

1 ml of 0,05 mol/L H SO is added to 1 l of salt solution).
2 4
4 Apparatus
4.1 Climate chamber

The climate chamber shall be designed so that the following test conditions can be obtained, controlled

and monitored during the test.

An instantaneous maximum deviation from set relative humidity value of ±4 % in the range from 50 % to

95 % at 35 °C, which corresponds to a temperature accuracy requirement of ±0,8 °C at that temperature.

For the mean value in relative humidity during a period of constant climatic conditions 7 h to 8 h an

accuracy of ±2 % shall apply, corresponding to temperature accuracy requirement of in this case ±0,4 °C.

To meet the temperature and humidity accuracy requirements, the climate chamber should be equipped

with means for efficient circulation of air to provide for small temperature and humidity variations in

the chamber. Sufficient insulation of the chamber walls and lids are required in order to avoid excessive

condensation on these surfaces.

The climate chamber shall also be designed so that the relative humidity can be changed linearly with

respect to time from 95 % to 50 % within 2 h and back from 50 % to 95 % also within 2 h. Figure

...

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