SIST EN ISO 10270:2008

SLOVENSKI STANDARD
SIST EN ISO 10270:2008
01-julij-2008
Korozija kovin in zlitin - Preskušanje vodne korozije cirkonijevih zlitin za uporabo
v jedrskih reaktorjih (ISO 10270:1995)
Corrosion of metals and alloys - Aqueous corrosion testing of zirconium alloys for use in
nuclear power reactors (ISO 10270:1995)
Korrosion von Metallen und Legierungen - Korrosionsprüfung in wässrigen Lösungen für
in Kernreaktoren angewendete Zirkoniumlegierungen (ISO 10270:1995)
Corrosion des métaux et alliages - Essais de corrosion aqueuse des alliages de
zirconium utilisés dans les réacteurs nucléaires (ISO 10270:1995)
Ta slovenski standard je istoveten z: EN ISO 10270:2008
ICS:
27.120.99 Drugi standardi v zvezi z Other standards related to
jedrsko energijo nuclear energy
77.060 Korozija kovin Corrosion of metals
SIST EN ISO 10270:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 10270:2008

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SIST EN ISO 10270:2008
EUROPEAN STANDARD
EN ISO 10270
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2008
ICS 77.060; 27.120.10

English Version
Corrosion of metals and alloys - Aqueous corrosion testing of
zirconium alloys for use in nuclear power reactors (ISO
10270:1995/Cor 1:1997)
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 10270:1995/Cor 1:1997) Kernreaktoren angewendete Zirkoniumlegierungen (ISO
10270:1995/Cor 1:1997)
This European Standard was approved by CEN on 21 March 2008.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10270:2008: E
worldwide for CEN national Members.

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SIST EN ISO 10270:2008
EN ISO 10270:2008 (E)
Contents Page
Foreword.3

2

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SIST EN ISO 10270:2008
EN ISO 10270:2008 (E)
Foreword
The text of ISO 10270:1995/Cor 1:1997 has been prepared by Technical Committee ISO/TC 156 “Corrosion
of metals and alloys” of the International Organization for Standardization (ISO) and has been taken over as
EN ISO 10270:2008 by 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 October 2008, and conflicting national standards shall be withdrawn at
the latest by October 2008.
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.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 10270:1995/Cor 1:1997 has been approved by CEN as a EN ISO 10270:2008 without any
modification.

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SIST EN ISO 10270:2008

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SIST EN ISO 10270:2008
INTERNATIONAL
ISO
STANDARD
10270
First edition
1995-12-01
Corrosion of metals and alloys - Aqueous
corrosion testing of zirconium alloys for
use in nuclear power reactors
Corrosion des mktaux et alliages - Essais de corrosion aqueuse des
alliages de zirconium utilish dans /es reacteurs nuclbaires
Reference number
ISO 10270: 1995(E)

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SIST EN ISO 10270:2008
ISO 10270:1995(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. Esch 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.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 10270 was prepared by Technical Committee
ISOnC 156, Corrosion of metals and alloys.
Annexes A and B of this International Standard are for information only.
0 ISO 1995
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronie or mechanical, inciuding photocopying and
microfilm, without Permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1 211 Geneve 20 l Switzerland
Printed in Switzerland
ii

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SIST EN ISO 10270:2008
ISO 10270:1995(E)
INTERNATIONAL STANDARD 0 ISO
Corrosion of metals and alloys - Aqueous corrosion
testing of zirconium alloys for use in nuclear power
reactors
- This International Standard may involve the use of hazardous materials, operations
WARNING
and equipment (see clause 9). lt is the responsibility of whoever uses this International Standard
to consult and establish appropriate safety and health practices and determine the applicability
of regulatory limitations Prior to use.
Members of IEC and ISO maintain registers of cur-
1 Scope
rently valid International Standards.
This International Standard specifies:
ISO 5813:1983, Water quality - Determination of
dissolved Oxygen - lodome tric me thod.
a) the determination of mass gain;
ISO 5814:1990, Water quality - Determination of
b) the surface inspection of products of zirconium
dissolved Oxygen - Electrochemical probe method.
and its alloys when corrosion tested in water at
360 “C or in steam at or above 400 “C;
3 Definitions
c) that the tests in steam shall be performed at
IO,3 MPa (1 500 Psi).
For the purposes of this Internatior
ial Standard, the
following definitions apply.
This International Standard is applicable to wrought
products, castings, powder metallurgy products and
3.1 etching: A process for removal of surface metal
weld metals.
by action of acids in water.
This method has been widely used in the develop-
3.2 control Coupons: Zirconium alloy specimens of
ment of new alloys, heat treating practices and for the
known Performance used to monitor the validity of
evaluation of welding techniques, and should be util-
the test.
ized in its entirety to the extent specified for a product
acceptance test, rather than merely a means of as-
3.3 high mass gain Coupons: Zirconium alloy
sessing Performance in Service.
specimens that have been specially heat-treated to
produce a mass gain higher than the maximum given
2 Normative references
in materials acceptance specifications and which are
used for verifying the severity of the test procedure.
The following Standards contain provisions which,
through reference in this text, constitute provisions
of this International Standard. At the time of publi- 4 Principle
cation, the editions indicated were valid. All Standards
are subject to revision, and Parties to agreements Spetimens of zirconium or its alloys are exposed to
based on this International Standard are encouraged high-pressure water or steam at elevated tempera-
tures for 72 h or 336 h. The corrosion is normally
to investigate the possibility of applying the most re-
measured by the gain in mass of the specimens and
cent editions of the Standards indicated below.
1

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SIST EN ISO 10270:2008
ISO 10270:1995(E)
by the appearance of an Oxide film on the specimen 7.7 Concentrated hydrofluoric acid (HF).
surfaces. In some instances, such as weld evaluation,
mass gain measurements are either impractical to
7.8 Concentrated nitric acid (HNO,).
make or are not required. When so specified, the ap-
pearance of the specimen shall be the sole criterion
for acceptance. The test pressure in steam shall be
7.9 Concentrated sulfuric acid (H2S04).
IO,3 MPa (1 500 Psi).
7.10 Control coupons, as defined in 3.2.
5 Significance
7.11 High mass gain coupons, as defined in 3.3.
normally tested after careful
51 Spetimens are
e;ch ing and rinsin . pecimens with as-manufactured
0
surfaces may a so be tested without further surface
8 Apparatus
removal.
8.1 General
econd m aterial clad on the
5.2 When tub ng with a s
moved
surface is to be tested, the cladding shall be re The apparatus shall consist of equipment for
Prior to the test.
a) etching the specimens when required;
6 Interference
b) measuring the specimens’, surface area and
mass, the water resistivity and pH, the test tem-
Autoclave loads that have one or more specimens
perature and pressure, the etch and rinse tem-
showing gross Oxidation may, by contamination of the
perature;
environment, affect results of other specimens in the
autoclave.
c) performing the water or steam corrosion tests at
elevated temperatures and pressures.
7 Reagents and materials
8.2 Etching equipment, comprising an acid bath, a
running water rinse and a deionized water rinse
During the test, unless otherwise stated, only re-
needed for proper metal removal and stain-free rins-
agents of recognized analytical grade and only water
ing. Polyethylene or polypropylene tanks are com-
as described in 7.4 or 7.5 shall be used.
monly used with a bottom feed for running water
rinses. Specimen hangers are generally made of type
71 . Argon gas, welding grade.
300 series stainless steel. When many specimens are
processed, a mechanical dipper for the etching pro-
cess is useful.
7.2 Nitrogen gas for purging or controlling Oxygen
content.
8.3 Autoclaves, constructed of type 300 series
7.3 Argon-hydrogen mixture for purging to re- stainless steel or nicke1 base alloys such as UNS
grade NO6600 or NO6690 and manufactured to con-
move Oxygen.
form to government regulations governing unfired
pressure vessels. The autoclave is fitted with devices
7.4 Grade A water - purified water having an
for measurement and control of pressure and tem-
electrical resistivity of not less than 1 Macrn at
perature, safety devices and venting valves. Control
25 “C as measured before the statt of the test.
Systems for pressure and temperature shall be ad-
equate to meet the requirements of this International
Standard. Sample holders and other internal access-
7.5 Grade B water - deionized or demineralized
ories are also constructed of type 300 or type 400
water having an electrical resistivity of not less than
series stainless steel, or nickel-base alloys such as
0,5 Mficrn at 25 “C. Grade A water tan be used in-
stead of grade B water. UNS grade NO6600 or N06690.
8.4 Specimen size measuring equipment, accu-
76 . Detergents and solvents for specimen clean-
ing including ethanol and acetone. rate to 50 Pm.

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SIST EN ISO 10270:2008
0 ISO ISO 10270:1995(E)
8.5 Analytical balance, accurate to 0,l mg, or dirt, loose oxides or rust, or an oil or grease film
on the water surface, internal surface, gasket or head
surfaces.
9 Hazards
11.1.2 Clean all new and reworked fixtures and jigs
9.1 The chemicals used in preparing specimens for
to be used in the autoclave and rinse in hot grade B
this test are hazardous. Detailed information on safe
water. Autoclave the fixtures and jigs for at least
handling of organic compounds, acids and products
1 day at 400 “C in steam at IO,3 MPa or, preferably,
of zirconium and its alloys should be obtained from
at 360 “C in water. Inspect the Parts for corrosion
competent sources.
products. If corrosion products are found or electrical
resistivity of the residual water after the test meas-
9.2 High-temperature, high-pressure autoclave op-
Ures less than 0,l Mficm, clean and autoclave the
eration must be in accordance with government
Parts again.
regulations and manufacturer’s instructions.
11.2 General requirements for autoclaves and Parts
9.3 Hydrogen gas used for addition to the autoclave
in continuous use for corrosion testing under this
steam supply must be handled in accordance with
International Standard are as follows.
guidelines for explosives and inflammable sub-
stances. All autoclaves, fixtures, Parts and jigs that have been
in continuous use and have shown satisfactory be-
haviour in Prior tests shall be rinsed with grade B
9.4 Cold water should not be added directly to the
water. The fixtures and jigs for corrosion products
autoclave vessel in Order to accelerate cooling upon
shall be inspected after each test and items showing
the completion of testing.
loose corrosion products, shall be re-worked and re-
prepared.
IO Sampling, test specimens and test
units
12 Calibration and standardization
10.1 The size and the quantity of the test speci-
12.1 High mass gain Coupon preparation
mens, the method of selection, surface preparation
and test acceptance criteria shall be specified in the
High mass gain Coupons (7.11) shall be selected from
product specification or by agreement between the
a previously tested lot. The selected material shall be
purchaser and the Seller as stated in the purchase
specially heat treated Prior to exposure in Order to
contract. Total surface area for each specimen shall
produce the desired mass gain in the autoclave test.
be a minirr um 10 cm*.
Heating for 8 h at 900 “C and cooling to 300 “C at a
rate not exceeding 3,3 “C/min in an inert atmosphere
10.2 Esc I specimen and control Coupon shall be
or vacuum is a suggested procedure, but alternative
individually identified.
procedures tan be used. This treatment shall be used
in the case of Zircalloy type alloys. Other alloy types
11 Preparation of apparatus
may require different heat treatment.
11.1 General requirements for new or reworked
12.2 Autoclaves
autoclaves (8.3) and Parts of autoclaves previously
used for testing materials other than in accordance
12.2.1 Prior to use for product acceptance testing,
with this International Standard are as follows.
an autoclave shall be profiled thermally as in 12.4.2
and shall demonstrate acceptability by testing at least
11.1.1 Before specimens are tested in a new or re-
three control Coupons, one each at the top, middle
worked autoclave, or in one having new valves, tub-
and bottom of a useful volume. The test results shall
ing, gaskets, etc., which are in contact with the test
be incorporated in the certification document for the
specimen, clean the apparatus thoroughly, wipe with
autoclave acceptance test. When desired, high mass
ethanol or acetone (7.6), and rinse twice with
gain Coupons may also be used.
grade B water (7.5). Dry the autoclave or auxiliary
equipment by vacuum cleaning or drain and wipe with The new or used autoclave is considered acceptable
a clean, Iint-free cloth and inspect carefully to ensure if each control Coupon mass gain is reproducible
freedom from contamination. There should be no vis- within the previously established control Coupon
ible contamination, such as Iubricant, residues, dust mean mass gain, + 3 Standard deviations.

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SIST EN ISO 10270:2008
0 ISO
ISO 10270:1995(E)
123.2 The control Coupons may be as manufactured
12.22 The control Coupon lot (7.10) and, when de-
or etched before testing, but if etched, the surfaces
sired, the high mass gain Coupon lot (7.11) mass gain
shall exhibit no stains, pits or areas of abnormal etch-
mean and Standard deviation shall be established by
ing attack.
a minimum of one autoclave test as follows.
Randomly select 12 specimens from either the con-
12.3.3 An autoclave test shall be considered ac-
trol Coupon lot or the high mass gain Coupon lot or
ceptable only if each post-test control Coupon mass
both.
gain is not less than the established mean value - 3
Standard deviations and the visual appearance of each
Prepare all specimens in accordance with 13.4 in or-
control Coupon is equal to or better than the product
der to meet the pretest requirements of this Inter-
acceptance Standard. If a control Coupon post-test
national Standard.
mass gain exceeds the mean value + 3 Standard de-
viations, or the specified mass gain value and one or
Locate the 12 or 24 specimens in a fixture or jig (see
more test specimens from the corresponding location
figure l), and place the fixture or jig inside the useful
in the autoclave fail to meet the mass gain acceptance
volume of the autoclave.
criterion, the failed specimen(s) may be discarded and
a new test made to determine conformance.
Complete the steam or water corrosion test in ac-
cordante with any one of the four methods in section
12.3.4 Control Coupons may be re-used after mech-
14.3.
anical removal of Oxide film followed by etching as
Remove specimens and weigh in accordance with the
described in 13.4.1.
requirement of this International Standard.
12.4 Calibration
Calculate and establish the mass gain mean and
standard deviation [(IZ - 1) method] of each set of
12.4.1 The temperature measurement and recording
Coupons for the test method used.
Systems used to determine conformance shall be
calibrated at least every six months and shall not de-
NOTE 1 For the product acceptance tests, the mean
value and Standard deviation for the control Coupons may viate more than + 3 “C from the calibration reference
be the value established as described above ot- it may be
materials traceable to national Standards.
calculated periodically using all accepted values determined
over the preceding three-month period but not less than
12.4.2 Vertical thermal profiles of the autoclaves at
21 values.
the test temperatures shall be made at least once in
each six-month period, or whenever the heaters or
12.23 An alternative method for establishing the the control thermocouples are adjusted or replaced.
The axial extent of the autoclave used for performing
mass gain mean and Standard deviation is as follows.
the product acceptance testing shall be restricted to
Expose the control Coupons to be used i
...