SIST EN ISO 16151:2018

SLOVENSKI STANDARD
SIST EN ISO 16151:2018
01-november-2018
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SIST EN ISO 16151:2008
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Corrosion of metals and alloys - Accelerated cyclic test with exposure to acidified salt
spray, dry and wet conditions (ISO 16151:2018)
Korrosion von Metallen und Legierungen - Schnellprüfungen unter zyklisch wechselnder
Beanspruchung mit saurem Salzsprühnebel, "trockenen“ und "feuchten“ Bedingungen
(ISO 16151:2018)
Corrosion des métaux et alliages - Essais cycliques accélérés avec exposition au
brouillard salin acidifié, en conditions «sèches» et en conditions «humides» (ISO
16151:2018)
Ta slovenski standard je istoveten z: EN ISO 16151:2018
ICS:
77.060 Korozija kovin Corrosion of metals
SIST EN ISO 16151:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 16151:2018

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SIST EN ISO 16151:2018


EN ISO 16151
EUROPEAN STANDARD

NORME EUROPÉENNE

July 2018
EUROPÄISCHE NORM
ICS 77.060 Supersedes EN ISO 16151:2008
English Version

Corrosion of metals and alloys - Accelerated cyclic test
with exposure to acidified salt spray, dry and wet
conditions (ISO 16151:2018)
Corrosion des métaux et alliages - Essais cycliques Korrosion von Metallen und Legierungen -
accélérés avec exposition au brouillard salin acidifié, en Schnellprüfungen unter zyklisch wechselnder
conditions "sèches" et en conditions "humides" (ISO Beanspruchung mit saurem Salzsprühnebel,
16151:2018) "trockenen" und "feuchten" Bedingungen (ISO
16151:2018)
This European Standard was approved by CEN on 30 May 2018.

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, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16151:2018 E
worldwide for CEN national Members.

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SIST EN ISO 16151:2018
EN ISO 16151:2018 (E)
Contents Page
European foreword . 3
2

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SIST EN ISO 16151:2018
EN ISO 16151:2018 (E)
European foreword
This document (EN ISO 16151:2018) 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, including for corrosion protection and corrosion testing of metals and alloys”
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 January 2019, and conflicting national standards shall
be withdrawn at the latest by January 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 16151:2008.
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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 16151:2018 has been approved by CEN as EN ISO 16151:2018 without any modification.

3

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SIST EN ISO 16151:2018

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SIST EN ISO 16151:2018
INTERNATIONAL ISO
STANDARD 16151
Second edition
2018-05
Corrosion of metals and alloys —
Accelerated cyclic test with exposure
to acidified salt spray, dry and wet
conditions
Corrosion des métaux et alliages — Essais cycliques accélérés avec
exposition au brouillard salin acidifié, en conditions «sèches» et en
conditions «humides»
Reference number
ISO 16151:2018(E)
©
ISO 2018

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SIST EN ISO 16151:2018
ISO 16151:2018(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

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SIST EN ISO 16151:2018
ISO 16151:2018(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Test solution . 2
4.1 General . 2
4.2 Method A . 2
4.2.1 Neutral sodium chloride solution . 2
4.2.2 Preparation of the acidified-salt solution . 2
4.3 Method B . 3
4.3.1 Preparation of the mixed salt solution . 3
4.3.2 Preparation of the acidic solution . 3
4.3.3 Preparation of the acidified-salt solution . 3
5 Apparatus . 3
6 Test specimens. 5
7 Arrangement of the test specimen . 5
8 Operating condition . 6
9 Continuity of tests . 8
10 Duration of the tests . 8
11 Treatment of test specimens after test . 8
11.1 General . 8
11.2 Non-organic coated test specimens: metallic and/or inorganic coated . 8
11.3 Organic coated test specimens . 8
11.3.1 Scribed organic coated test specimens . 8
11.3.2 Organic coated but not scribed test specimens . 9
12 Evaluation of results . 9
13 Test report . 9
Annex A (informative) Relationship between amounts of acidic stock solution added to
mixed salt solution and pH of the resulting acidified-salt solution .11
Annex B (informative) Typical apparatus for accelerated cyclic tests with exposure to
acidified salt spray, dry and wet conditions .12
Annex C (informative) Method for evaluation of the corrosivity of the apparatus .14
Annex D (normative) Preparation of test specimens with organic coatings for testing .16
Annex E (normative) Required supplementary information for testing test specimens with
organic coatings .17
Bibliography .18
© ISO 2018 – All rights reserved iii

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SIST EN ISO 16151:2018
ISO 16151:2018(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 voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys.
This second edition cancels and replaces the first edition (ISO 16151:2005), which has been technically
revised. The main technical changes are as follows:
— harmonization with ISO 9227;
— terms and definitions clause has been added.
iv © ISO 2018 – All rights reserved

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SIST EN ISO 16151:2018
ISO 16151:2018(E)

Introduction
Corrosion of metallic materials, with or without corrosion protection, is influenced by many
environmental factors, the importance of which may vary with the type of metallic material and with
the type of environment. It is impossible, therefore, to design accelerated laboratory corrosion tests in
such a way that all environmental factors influencing resistance to corrosion are taken into account.
Laboratory tests are, therefore, designed to simulate the effects of the most important factors, which
enhance the corrosion of metallic materials.
The accelerated corrosion-test methods described in this document are designed to simulate and
enhance the environmental influence on a metallic material to outdoor climates, where exposure to
acid rain and to salt-contaminated conditions occur and may promote corrosion. It has been prepared
by reference to technical papers and reports (see the Bibliography).
The test methods involve cyclic exposure of test specimens to a mist of acidified-salt solution, to drying
conditions, and to periods of high humidity. However, the methods are mainly intended for comparative
testing and the results obtained do not permit far-reaching conclusions on the corrosion resistance of
the tested metallic material under the whole range of environmental conditions in which they may be
used. Nevertheless, the methods provide valuable information on the relative performance of materials
exposed to salt and/or acid rain environments similar to those employed in the test.
© ISO 2018 – All rights reserved v

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SIST EN ISO 16151:2018

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SIST EN ISO 16151:2018
INTERNATIONAL STANDARD ISO 16151:2018(E)
Corrosion of metals and alloys — Accelerated cyclic
test with exposure to acidified salt spray, dry and wet
conditions
WARNING — This document may involve hazardous materials, operations and equipment. It does
not purport to address all of the safety problems associated with its use. It is the responsibility
of the user of this document to establish appropriate safety and health practices.
1 Scope
This document specifies two accelerated corrosion-test procedures, Methods A and B, for the
comparative evaluation of metallic materials with or without permanent corrosion protection or
temporary corrosion protection in outdoor salt and/or acid rain environments. It also specifies the
apparatus used. The two tests involve cyclic exposure of the specimens to acidified salt spray, “dry” and
“wet” conditions.
The particular advantages of the two tests over conventional accelerated tests, such as the neutral salt
spray (NSS) test as specified in ISO 9227 lie in their better ability to reproduce the corrosion that occurs
in outdoor salt and/or acid rain environments. They are also useful for evaluating cosmetic corrosion.
Method A is applicable to
— metals and their alloys,
— metallic coatings (cathodic),
— anodic oxide coatings, and
— organic coatings on metallic materials.
Method B is applicable to
— steel coated with anodic coatings, and
— steel coated with anodic coatings covered with conversion coatings.
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.
ISO 1514, Paints and varnishes — Standard panels for testing
ISO 2808, Paints and varnishes — Determination of film thickness
ISO 4623-2:2016, Paints and varnishes — Determination of resistance to filiform corrosion — Part 2:
Aluminium substrates
ISO 8044, Corrosion of metals and alloys — Basic terms and definitions
ISO 17872, Paints and varnishes — Guidelines for the introduction of scribe marks through coatings on
metallic panels for corrosion testing
© ISO 2018 – All rights reserved 1

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SIST EN ISO 16151:2018
ISO 16151:2018(E)

3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8044 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
reference material
material with known test performance
3.2
reference specimen
portion of the reference material (3.1) that is to be exposed with the intention to check the reproducibility
and repeatability of the test results for the test cabinet in use
3.3
test specimen
specific portion of the samples upon which the testing is to be performed
3.4
substitute specimen
specimen made of inert materials (such as plastic or glass) used for the substitute of a test specimen (3.3)
4 Test solution
4.1 General
Instructions for the preparation and use of the solutions used in Methods A and B are given in 4.2 and 4.3.
4.2 Method A
4.2.1 Neutral sodium chloride solution
A sufficient mass of sodium chloride shall be dissolved in distilled or deionized water, with a
conductivity not higher than 20 µS/cm at 25 °C ± 2 °C, to produce a concentration of 50 g/l ± 5 g/l. The
specific gravity range for a 50 g/l ± 5 g/l solution shall be 1,029 to 1,036 at 25 °C.
The sodium chloride shall not contain a mass fraction of the heavy metals of copper (Cu), nickel (Ni) and
lead (Pb) in total more than 0,005 %. It shall not contain a mass fraction of sodium iodide more than
0,1 % and a mass fraction of total impurities more than 0,5 %, calculated for dry salt.
NOTE Sodium chloride with anti-caking agents can act as corrosion inhibitors or accelerators. A useful
sodium chloride salt grade is a grade named Ph. Eur/USP or JIS, ACS.
4.2.2 Preparation of the acidified-salt solution
The pH of the solution shall be adjusted to a value of 3,5 ± 0,1 at 25 °C ± 2 °C, by adding the following
reagents to 10 l of the prepared neutral sodium chloride solution in 4.2.1 as follows:
— 12 ml of nitric acid (HNO , ρ = 1,42 g/ml);
3
— 17,3 ml of sulfuric acid (H SO , ρ = 1,84 g/ml);
2 4
— a 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).
2 © ISO 2018 – All rights reserved

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SIST EN ISO 16151:2018
ISO 16151:2018(E)

4.3 Method B
4.3.1 Preparation of the mixed salt solution
The reagent shown in Table 1 shall be dissolved in distilled or deionized water, with a conductivity not
higher than 20 µS/cm at 25 °C ± 2 °C, to produce a stock solution with a concentration of 36,0 g/l ± 3,6 g/l.
It shall be diluted by 1:6 to produce a mixed salt solution with a concentration of 6,0 g/l ± 0,6 g/l.
Table 1 — Composition and concentration of a stock solution for a mixed salt solution
Reagent Concentration
g/l
NaCl 24,53
MgCl 5,20
2
Na SO 4,09
2 4
CaCl 1,16
2
KCl 0,695
NaHCO 0,201
3
KBr 0,101
H BO 0,027
3 3
SrCl 0,025
2
NaF 0,003
WARNING — Handling of SrCl and NaF can be hazardous
2
and shall be restricted to skilled chemists or conducted
under their control.
NOTE  The composition of the stock solution is the same as
typical synthetic ocean water shown in ISO 11130.
4.3.2 Preparation of the acidic solution
To prepare the acidic solution, 16,2 g of concentrated nitric acid (HNO , ρ = 1,40 g/ml, with a mass
3
fraction of HNO equal to 0,65) and 42,5 g of sulfuric acid (H SO , ρ = 1,84 g/ml, with a mass fraction
3 2 4
of H SO equal to 0,96) shall be dissolved in water and diluted to a total volume of 1 l to make 1 N acid
2 4
– 2–
solution with respect to nitric acid and sulfuric acid at an equivalent ratio of [NO ]/[SO ] of 0,4.
3 4
4.3.3 Preparation of the acidified-salt solution
The prepared acidic solution from 4.3.2 shall be added to the mixed salt solution from 4.3.1 to adjust the
pH to 2,5 ± 0,1 at 25 °C ± 2 °C.
NOTE The relationship between the amount of mixed acidic solution from 4.3.2 and the pH of the acidified-
salt solution is shown in Annex A. This solution, with pH value near to 2,5, would have a no-buffering action.
5 Apparatus
5.1 Component protection.
All components in contact with the spray or the test solution shall be made of, or lined with, materials
which are resistant to corrosion by the test solution and which do not influence the corrosivity of the
sprayed test solution.
The supports for the test specimen shall be constructed such that different substrate types do not
influence each other. It shall also be constructed so that the supports themselves do not influence the
test specimens.
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SIST EN ISO 16151:2018
ISO 16151:2018(E)

5.2 Test cabinet.
The test cabinet shall be such that the conditions of homogeneity and distribution of the spray are met.
3
Due to the limited capacity of test cabinets smaller than 0,4 m . The effect of the loading of the test
cabinet on the distribution of the spray and temperature shall be carefully considered. The solution
shall not be sprayed directly onto test specimens but rather spread throughout the test cabinet so that
it falls naturally down on them. The upper parts of the test cabinet shall be designed so that drops of
sprayed solution formed on its surface do not fall on the specimens being tested.
The size and shape of the test cabinet shall be such that, during periods of exposure to salt mist spray,
the rate of collection of solution in the test cabinet is within the limits specified in 8.2.
NOTE A schematic diagram of one possible design of test cabinet and associated apparatus for accelerated
cyclic tests with exposure to acidified salt spray, “dry” and “wet” conditions is shown in Annex B.
5.3 Humidity and temperature control.
The temperature and humidity control system of the test cabinet shall be capable of achieving the test
condition transition times listed in 8.1 when the test cabinet is filled with flat substitute specimens
having a dimension of 150 mm × 70 mm × 1 mm.
5.4 Spraying device.
The device for spraying the acidified-salt solution shall comprise a supply of clean air, of controlled
pressure and humidity, a reservoir containing the solution to be sprayed, and one or more atomizers.
The compressed air supplied to the atomizers shall be passed through a filter to remove all traces of oil or
solid matter, and the atomizing pressure shall be at an overpressure of 70 kPa to 170 kPa. The pressure
is typically 98 kPa ± 10 kPa but can vary depending on the type of test cabinet and atomizer used.
The atomizers shall be made of inert material. Baffles may be used to prevent direct impact of spray
on the test specimens, and the use of adjustable baffles is helpful in obtaining uniform distribution of
spray within the test cabinet. For this purpose, a dispersion tower equipped with an atomizer may also
be helpful.
5.5 Air saturator.
In order to prevent evaporation of water from the sprayed droplets, the air shall be humidified before
entering the atomizer, by passage through a saturation tower containing hot water at a temperature
higher than that of the test cabinet.
During periods of exposure to the acidified-salt solution mist, the appropriate temperature depends on
the pressure used and on the type of atomizer nozzle and shall be adjusted so that the rate of collection
of spray in the test cabinet, and the concentration of the collected spray, are kept within the specified
limits (see 8.2). The level of water shall be maintained automatically to ensure adequate humidification.
5.6 Collecting devices.
At least two suitable collecting devices shall be available, consisting of clean funnels with a collecting
2
area of approximately 80 cm , made of glass or other chemically inert material, with the stems inserted
into graduated cylinders or other similar containers. The purpose of the collecting devices is to confirm
that the collection rate is within specified limits (see 8.2). They shall be placed in the zone of the test
cabinet where the test specimens are placed, at least one close to the spray inlet and one remote from
the inlet and in such a way that only spray, and not the liquid falling from specimens or from parts of
the test cabinet, is collected.
5.7 Air dryer.
A heating device and fan shall supply dried air of the specified humidity during “dry” periods (see 8.1).
4 © ISO 2018 – All rights reserved

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SIST EN ISO 16151:2018
ISO 16151:2018(E)

5.8 Exhaust system.
The system by which air is exhausted from the test cabinet shall not be influenced by the back pressure
of the atmosphere when the air is released at a point outside the building. It is preferred that the
apparatus has a means to properly treat the fog prior to releasing it outside the building (see Annex B).
5.9 Drain system.
An appropriate system to treat the drain water shall be provided, so that the solution is not directly
discharged into the drainage system (see Annex B).
6 Test specimens
6.1 The number and type of test specimens, their shape and their dimensions, shall be selected in
accordance with the specification for the material or product being tested. When not specified, these
parameters shall be mutually agreed between the interested parties. Unless otherwise specified or agreed,
test specimens with an organic coating to be tested shall be made from burnished steel conforming
with ISO 1514, and of approximate dimensions 150 mm × 100 mm × 1 mm. Annex D describes how test
specimens with organic coatings shall be prepared for testing. Annex E gives supplementary information
that shall be supplied, as appropriate, for testing test specimens with organic coatings.
6.2 The test specimens shall be thoroughly cleaned
...