SIST EN ISO 10270:2022

SLOVENSKI STANDARD
01-april-2022
Nadomešča:
SIST EN ISO 10270:2008
Korozija kovin in zlitin - Preskušanje vodne korozije cirkonijevih zlitin za uporabo
v jedrskih reaktorjih (ISO 10270:2022)
Corrosion of metals and alloys - Aqueous corrosion testing of zirconium alloys for use in
nuclear power reactors (ISO 10270:2022)
Korrosion von Metallen und Legierungen - Korrosionsprüfung in wässrigen Lösungen für
in Kernreaktoren angewendete Zirkoniumlegierungen (ISO 10270:2022)
Corrosion des métaux et alliages - Essais de corrosion aqueuse des alliages de
zirconium utilisés dans les réacteurs nucléaires (ISO 10270:2022)
Ta slovenski standard je istoveten z: EN ISO 10270:2022
ICS:
27.120.99 Drugi standardi v zvezi z Other standards related to
jedrsko energijo nuclear energy
77.060 Korozija kovin Corrosion of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 10270
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2022
EUROPÄISCHE NORM
ICS 27.120.10; 77.060 Supersedes EN ISO 10270:2008
English Version
Corrosion of metals and alloys - Aqueous corrosion testing
of zirconium alloys for use in nuclear power reactors (ISO
10270:2022)
Corrosion des métaux et alliages - Essais de corrosion Korrosion von Metallen und Legierungen -
aqueuse des alliages de zirconium utilisés dans les Korrosionsprüfung in wässrigen Lösungen für in
réacteurs nucléaires (ISO 10270:2022) Kernreaktoren angewendete Zirkoniumlegierungen
(ISO 10270:2022)
This European Standard was approved by CEN on 26 December 2021.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10270:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 10270:2022) 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 August 2022, and conflicting national standards shall
be withdrawn at the latest by August 2022.
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 10270:2008.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 10270:2022 has been approved by CEN as EN ISO 10270:2022 without any modification.

INTERNATIONAL ISO
STANDARD 10270
Second edition
2022-02
Corrosion of metals and alloys —
Aqueous corrosion testing of
zirconium alloys for use in nuclear
power reactors
Corrosion des métaux et alliages — Essais de corrosion aqueuse des
alliages de zirconium utilisés dans les réacteurs nucléaires
Reference number
ISO 10270:2022(E)
ISO 10270:2022(E)
© ISO 2022
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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 10270:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Significance . 2
6 Interference. 2
7 Reagents and materials . 2
8 Apparatus . 3
9 Hazards . 3
10 Sampling, test specimens and test units . 3
11 Preparation of apparatus .4
12 Calibration and standardization .4
12.1 High mass gain coupon preparation . 4
12.2 Autoclaves . 4
12.3 Use of control coupons. 7
12.4 Calibration . 7
13 Conditioning .7
13.1 Test water quality . 7
13.2 Autoclave load restrictions . 8
13.3 Test conditions . 8
13.3.1 Temperature . 8
13.3.2 Pressure . 8
13.3.3 Time . 8
13.3.4 Tests . 8
13.4 Specimen preparation . 8
13.4.1 Etched specimens . 8
13.4.2 As-manufacturer specimens . 8
14 Procedure .8
14.1 Inspection of specimens . . 8
14.2 Dimensions, weight and inspection . 9
14.3 Autoclaving . 9
14.3.1 Placing of test specimens . 9
14.3.2 Venting method A . 9
14.3.3 Venting method B . 10
14.3.4 Closed system method C . 10
14.3.5 Refreshed autoclaving, method D . 11
14.4 Post-test measurements and inspection . 11
15 Calculation or interpretation of results .11
15.1 Calculation of mass gain . 11
15.2 Visual interpretation of surface appearance .12
15.3 Invalid tests .12
16 Test report .12
Annex A (informative) Guide to specimen preparation .13
Bibliography .16
iii
ISO 10270:2022(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 are 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 is not 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 of 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
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys, in
collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/
TC 262, Metallic and other inorganic coatings, including for corrosion protection and corrosion testing of
metals and alloys, in accordance with the Agreement on technical cooperation between ISO and CEN
(Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 10270:1995), which has been technically
revised. It also incorporates the Technical Corrigendum ISO 10270:1995/Cor 1:1997. The main changes
compared with the previous edition are as follows:
— the references have been updated;
— in Clause 4, two sentences have been added: “The tests in water is performed at 18,6 MPa. The
pressure is also determined by the contractor's requirements.”;
— in 5.2, “the test” has been replaced by “the measurement to avoid erroneous results from differing
corrosion behaviour of the materials”;
— in 7.1, “welding grade” has been replaced by “of purity 999,9 ml/l or higher”,
— in 11.1, d), “1 day” has been replaced by “24 h”; and “at 18,6 MPa” has been added after “at 360 °C in
water”.
— in 12.1, a sentence has been added: “Post-heat treatment, the coupons are inspected for any residual
oxide and prepared (e.g. etched) in line with standard coupons”;
— in 12.3.4, a sentence has been added: “However, for the product acceptance test, it is better to keep
the control coupons as evidence of test effectiveness.”;
— in 13.3.1, “±3 °C for steam tests, and ±6 °C for water tests” has been replaced by “±3 °C for steam
tests and water tests”;
— in 13.3.3, “3 days or 14 days” has been replaced by “72 h or 336 h”;
iv
ISO 10270:2022(E)
— in 14.2, a sentence has been added: “Mass gain measurements are taken in triplicate for each
specimen and a mean value calculated”;
— in 14.3.1, a sentence has been added: “The separators are such as not to induce Galvanic interaction
between the samples and the separators”; “zirconium or zirconium alloy” has been added before
“stainless steel”;
— in Clause 16, “including its number and year of publication” has been added before “this document”;
— in A.3.1, “3 % (m/m) of hydrofluoric acid (7.7), 39 % (m/m) of nitric acid (7.8)” has been replaced by
“40 g/kg ± 20 g/kg of hydrofluoric acid (7.7), 450 g/kg ± 50 g/kg of nitric acid (7.8)”, and a sentence
has been added: “A different acid ratio may be chosen to satisfy the requirement of a smooth and
shining surface given in 13.4.1;
— in A.3.2, “9 % (m/m) ± 1 % (m/m)” has been replaced by “90 g/kg ± 10 g/kg” and
“30 % (m/m) ± 5 % (m/m)” has been replaced by “300 g/kg ± 50 g/kg”;
— in A.4.2,“25 % (V/V)” has been replaced by “250 ml/l” and “50 % (V/V)” has been replaced by
“500 ml/l”;
— in Clause A.6, the following text has been added: “or placed into the oven at a recommended
temperature of 60 °C to 70 °C for 1 h" and “The specimens need to be cooled to room temperature
after removing from the oven”.
Any feedback or questions on this document are directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
v
INTERNATIONAL STANDARD ISO 10270:2022(E)
Corrosion of metals and alloys — Aqueous corrosion
testing of zirconium alloys for use in nuclear power
reactors
WARNING — This document can involve the use of hazardous materials, operations and
equipment (see Clause 9). It is the responsibility of the user of this document to consult and
establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
1 Scope
This document specifies:
a) the determination of mass gain;
b) the surface inspection of products of zirconium and its alloys when corrosion is tested in water at
360 °C or in steam at or above 400 °C;
c) the performance of tests in steam at 10,3 MPa.
This document is applicable to wrought products, castings, powder metallurgy products and weld
metals.
This method has been widely used in the development of new alloys, heat-treating practices and for
the evaluation of welding techniques. It is applicable for use in its entirety to the extent specified for a
product acceptance test, rather than merely a means of assessing performance in service.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
etching
process for the removal of surface metal by action of acids in water
3.2
control coupon
zirconium alloy specimen of known performance used to monitor the validity of the test
3.3
high mass gain coupon
zirconium alloy specimen that has been specially heat-treated to produce a mass gain higher than the
maximum given in materials acceptance specifications and which is used for verifying the severity of
the test procedure
ISO 10270:2022(E)
4 Principle
Specimens of zirconium or its alloys are exposed to high-pressure water or steam at elevated
temperatures for 72 h or 336 h. The corrosion is normally measured by the gain in mass of the
specimens and by the appearance of an oxide film on the specimen surfaces. In some instances, such
as weld evaluation, mass gain measurements are either impractical to make or are not required. When
so specified, the appearance of the specimen is the sole criterion for acceptance. The test pressure in
steam is 10,3 MPa. The tests in water is performed at 18,6 MPa. The pressure is also determined by the
contractor's requirements.
5 Significance
5.1 Specimens are normally tested after careful etching and rinsing. Specimens with as-manufactured
surfaces may also be tested without further surface removal.
5.2 When tubing with a second material clad on the surface is to be tested, the internal cladding is
removed prior to the measurement to avoid erroneous results from differing corrosion behaviour of the
materials.
6 Interference
Autoclave loads that have one or more specimens showing gross oxidation can, by contamination of the
environment, affect results of other specimens in the autoclave.
7 Reagents and materials
During the test, unless otherwise stated, only reagents of recognized analytical grade and only water
as described in 7.4 or 7.5 are used.
7.1 Argon gas, of purity 999,9 ml/l or higher.
7.2 Nitrogen gas, for purging or controlling oxygen content.
7.3 Argon-hydrogen mixture, for purging to remove dissolved oxygen.
7.4 Grade A water, purified water having an electrical resistivity of not less than 1 MΩ·cm at 25 °C as
measured before the start of the test.
7.5 Grade B water, deionized or demineralized water having an electrical resistivity of not less than
0,5 MΩ·cm at 25 °C. Grade A water can be used instead of grade B water.
7.6 Detergents and solvents, for specimen cleaning, including ethanol and acetone.
7.7 Concentrated hydrofluoric acid (HF).
7.8 Concentrated nitric acid (HNO ).
7.9 Concentrated sulfuric acid (H SO ).
2 4
7.10 Control coupon.
7.11 High mass gain coupon.
ISO 10270:2022(E)
8 Apparatus
The apparatus consists of equipment for:
a) etching the specimen when required;
b) measuring the specimens’ surface area and mass, the water resistivity and pH, the test temperature
and pressure, and the etch and rinse temperature;
c) performing the water or steam corrosion tests at elevated temperatures and pressures.
8.1 Etching equipment, comprising an acid bath, a running water rinse and a deionized water rinse
needed for proper metal removal and stain-free rinsing. Polyethylene or polypropylene tanks are
commonly used with a bottom feed for running water rinses. Specimen hangers are generally made
of type 300 series stainless steel. When many specimens are processed, a mechanical dipper for the
etching process is useful.
8.2 Autoclaves, constructed of type 300 series stainless steel or nickel base alloys such as UNS grade
N06600 or N066901. The autoclave is fitted with devices for measurement and control of pressure and
temperature, safety devices and venting valves. Control systems for pressure and temperature are
adequate to meet the requirements of this document. Sample holders and other internal accessories are
1)
also constructed of type 300 or type 400 series stainless steel, or nickel-base alloys such as UNS grade
N06600 or N06690.
8.3 Specimen size measuring equipment, accurate to 50 μm.
8.4 Analytical balance, accurate to 0,1 mg.
9 Hazards
9.1 The chemicals used in preparing specimens for this test are hazardous. Detailed information on
the safe handling of organic compounds, acids and products of zirconium and its alloys are obtained
from competent sources.
9.2 High-temperature, high-pressure autoclave operation is in accordance with the manufacturer's
instructions.
9.3 Hydrogen gas used for the addition to the autoclave steam supply is handled in accordance with
the guidelines for explosives and inflammable substances.
9.4 Cold water is not added directly to the autoclave vessel in order to accelerate cooling upon the
completion of testing.
10 Sampling, test specimens and test units
10.1 The size and the quantity of the test specimens, the method of selection, surface preparation
and test acceptance criteria are specified in the product specification or by agreement between the
purchaser and the seller as stated in the purchase contract. The total surface area for each specimen is
a minimum of 10 cm .
10.2 Each specimen and control coupon is individually identified.
1) UNS grades N06600 and N06690 are examples of suitable products available
...