ISO 26202:2019
(Main)Magnesium and magnesium alloys — Magnesium alloys for cast anodes
Magnesium and magnesium alloys — Magnesium alloys for cast anodes
This document specifies the grades and the corresponding requirements for magnesium alloy ingots for anodes and for magnesium alloy cast anodes.
Magnésium et alliages de magnésium — Alliages de magnésium pour anodes coulées
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INTERNATIONAL ISO
STANDARD 26202
Second edition
2019-10
Magnesium and magnesium alloys —
Magnesium alloys for cast anodes
Magnésium et alliages de magnésium — Alliages de magnésium pour
anodes coulées
Reference number
©
ISO 2019
© ISO 2019
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 2019 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Designations . 1
4.1 Material . 1
4.2 Casting process . 1
5 Requirements . 2
5.1 General . 2
5.2 Chemical composition . 2
6 Testing . 5
6.1 Sampling . 5
6.2 Determination of the chemical composition . 5
6.3 Electrochemical testing . 5
7 Rounding of numbers . 5
8 Packaging and surface protection . 5
Annex A (normative) Test method for the determination of the electrode potential of
galvanic anodes . 6
Annex B (normative) Test method for the determination of the rate of mass loss of galvanic
anodes . 8
Annex C (informative) Cross-references of grade designations of this document to other
standard grades of magnesium alloy ingots for cast anodes and magnesium alloys
for cast anodes .11
Bibliography .12
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 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 79, Light metals and their alloys,
Subcommittee SC 5, Magnesium and alloys of cast or wrought magnesium.
This second edition cancels and replaces the first edition (ISO 26202:2007), which has been technically
revised. The main changes compared with the previous edition are as follows:
a) a note has been added in 4.1;
b) in Clause 5, the compositions in Tables 1 and 2 have been updated;
c) in Clause 5, EN-MBMgAl6Zn1 has been deleted and the designations “EN-” have been replaced
with “ISO-”;
d) “Sampling” has been included as 6.1;
e) “Packaging and surface protection” has been added as Clause 8;
f) in Annex C, cross-references of grade designations of this document to other standard grades of
magnesium alloys for cast anodes have been added.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2019 – All rights reserved
Introduction
This document classifies magnesium alloys for cast anodes into a number of grades suitable for the
applications for which they might be used. Annexes A and B describe methods for electrochemical tests
with corresponding recommended values. Annex C gives cross-references of grade designations of this
document to other standard grades of magnesium alloys for cast anodes.
INTERNATIONAL STANDARD ISO 26202:2019(E)
Magnesium and magnesium alloys — Magnesium alloys for
cast anodes
1 Scope
This document specifies the grades and the corresponding requirements for magnesium alloy ingots
for anodes and for magnesium alloy cast anodes.
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 80000-1:2009, Quantities and units — Part 1: General
EN 1559-1, Founding — Technical conditions of delivery — Part 1: General
EN 1559-5, Founding — Technical conditions of delivery — Part 5: Additional requirements for magnesium
alloy castings
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:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Designations
4.1 Material
The material shall be designated either by symbol or by number (see Tables 1 and 2).
NOTE Cross-references of grade designations of this document to other standard grades of magnesium
alloys for cast anodes are given in Annex C.
4.2 Casting process
The following symbols shall be used for the different casting processes:
— S: sand casting;
— K: permanent mould casting (gravity);
— C: continuous casting.
5 Requirements
5.1 General
The requirements for technical delivery conditions given in EN 1559-1 and EN 1559-5 shall apply, and/
or any other technical requirements specified in the order agreed between the purchaser and the
manufacturer.
5.2 Chemical composition
The chemical composition of magnesium alloy ingots for cast anodes shall conform to the requirements
given in Table 1. The chemical composition of magnesium cast anodes shall conform to the requirements
given in Table 2.
2 © ISO 2019 – All rights reserved
Table 1 — Chemical composition of magnesium alloy ingots for anode castings
Material designation Composition in percent (mass fraction)
Alloy
Others Others
group
Symbol Number Element Al Zn Mn Si Fe Cu Ni Mg
each total
min. 2,6 0,7 0,20 — — — — — —
ISO-MBMgAl3Zn1 ISO-MB21130 Remainder
max. 3,5 1,4 1,0 0,08 0,004 0,02 0,001 0,05 0,30
MgAlZn
min. 5,1 2,1 0,20 — — — — — —
ISO-MBMgAl6Zn3 ISO-MB21150 Remainder
max. 7,0 4,0 1,0 0,08 0,004 0,02 0,001 0,05 0,30
min. — — 0,50 — — — — — —
ISO-MBMgMn1 ISO-MB40010 Remainder
max. 0,01 0,05 1,3 0,05 0,01 0,02 0,001 0,05 0,30
MgMn
min. — — 1,20 — — — — — —
ISO-MBMgMn2 ISO-MB40020 Remainder
max. 0,01 0,05 2,5 0,05 0,01 0,02 0,001 0,05 0,30
4 © ISO 2019 – All rights reserved
Table 2 — Chemical composition of magnesium alloy anode castings
Material designation Composition in percent (mass fraction)
Alloy Casting
Others Others
a
group process
Symbol Number Element Al Zn Mn Si Fe Cu Ni Mg
each total
min. 2,5 0,6 0,2 — — — — — —
ISO-MAMgA3Zn1 ISO-MA21130 S, K, C Remainder
max. 3,5 1,4 1,0 0,1 0,005 0,02 0,001 0,05 0,30
MgAlZn
ISO- min. 5,0 2,0 0,2 — — — — — —
ISO-MA21150 S, K, C Remainder
MAMgAl6Zn3 max. 7,0 4,0 1,0 0,1 0,005 0,02 0,002 0,05 0,30
min. — — 0,5 — — — — — —
ISO-MAMgMn1 ISO-MA40010 S, K, C Remainder
max. 0,01 0,05 1,3 0,05 0,01 0,02 0,001 0,05 0,30
MgMn
min. — — 1,2 — — — — — —
ISO-MAMgMn2 ISO-MA40020 S, K, C Remainder
max. 0,01 0,05 2,5 0,05 0,01 0,02 0,001 0,05 0,30
For anodes used in potable (drinking) water, the following specifications shall be met (all in mass fraction): (As + Pb +Cr(VI) + Ni) % ≤ 0,1 % and (Cd + Sb + Se + Hg) % ≤ 0,01 %.
a
S = sand casting, K = permanent mould casting (gravity), C = continuous casting
6 Testing
6.1 Sampling
Samples that are representative of the material shall be produced at a frequency, form and quantity in
accordance with the process quality assurance procedures adopted by the manufacturer or as agreed
between the manufacturer and the purchaser. Samples shall be taken from the molten metal at the time
of casting.
6.2 Determination of the chemical composition
The methods used to determine the chemical composition of the material shall be in accordance with
standardized methods or validated procedures.
NOTE ASTM B953 and ASTM B954 can be used for this purpose.
6.3 Electrochemical testing
If applicable, electrochemical testing shall be carried out in accordance with Annexes A and B.
7 Rounding of numbers
The number representing the result for any value specified in this document shall be expressed to
the same number of decimal places as the corresponding number in this document. Rounding shall
be carried out as specified in ISO 80000-1:2009, B.2 and B.3. In B.3, it is left to the discretion of the
manufacturer as to whether to use rule A or rule B, unless the use of one of the rules has been agreed by
the time of the acceptance of the order.
8 Packaging and surface
...
INTERNATIONAL ISO
STANDARD 26202
Second edition
2019-10
Magnesium and magnesium alloys —
Magnesium alloys for cast anodes
Magnésium et alliages de magnésium — Alliages de magnésium pour
anodes coulées
Reference number
©
ISO 2019
© ISO 2019
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 2019 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Designations . 1
4.1 Material . 1
4.2 Casting process . 1
5 Requirements . 2
5.1 General . 2
5.2 Chemical composition . 2
6 Testing . 5
6.1 Sampling . 5
6.2 Determination of the chemical composition . 5
6.3 Electrochemical testing . 5
7 Rounding of numbers . 5
8 Packaging and surface protection . 5
Annex A (normative) Test method for the determination of the electrode potential of
galvanic anodes . 6
Annex B (normative) Test method for the determination of the rate of mass loss of galvanic
anodes . 8
Annex C (informative) Cross-references of grade designations of this document to other
standard grades of magnesium alloy ingots for cast anodes and magnesium alloys
for cast anodes .11
Bibliography .12
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 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 79, Light metals and their alloys,
Subcommittee SC 5, Magnesium and alloys of cast or wrought magnesium.
This second edition cancels and replaces the first edition (ISO 26202:2007), which has been technically
revised. The main changes compared with the previous edition are as follows:
a) a note has been added in 4.1;
b) in Clause 5, the compositions in Tables 1 and 2 have been updated;
c) in Clause 5, EN-MBMgAl6Zn1 has been deleted and the designations “EN-” have been replaced
with “ISO-”;
d) “Sampling” has been included as 6.1;
e) “Packaging and surface protection” has been added as Clause 8;
f) in Annex C, cross-references of grade designations of this document to other standard grades of
magnesium alloys for cast anodes have been added.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2019 – All rights reserved
Introduction
This document classifies magnesium alloys for cast anodes into a number of grades suitable for the
applications for which they might be used. Annexes A and B describe methods for electrochemical tests
with corresponding recommended values. Annex C gives cross-references of grade designations of this
document to other standard grades of magnesium alloys for cast anodes.
INTERNATIONAL STANDARD ISO 26202:2019(E)
Magnesium and magnesium alloys — Magnesium alloys for
cast anodes
1 Scope
This document specifies the grades and the corresponding requirements for magnesium alloy ingots
for anodes and for magnesium alloy cast anodes.
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 80000-1:2009, Quantities and units — Part 1: General
EN 1559-1, Founding — Technical conditions of delivery — Part 1: General
EN 1559-5, Founding — Technical conditions of delivery — Part 5: Additional requirements for magnesium
alloy castings
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:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Designations
4.1 Material
The material shall be designated either by symbol or by number (see Tables 1 and 2).
NOTE Cross-references of grade designations of this document to other standard grades of magnesium
alloys for cast anodes are given in Annex C.
4.2 Casting process
The following symbols shall be used for the different casting processes:
— S: sand casting;
— K: permanent mould casting (gravity);
— C: continuous casting.
5 Requirements
5.1 General
The requirements for technical delivery conditions given in EN 1559-1 and EN 1559-5 shall apply, and/
or any other technical requirements specified in the order agreed between the purchaser and the
manufacturer.
5.2 Chemical composition
The chemical composition of magnesium alloy ingots for cast anodes shall conform to the requirements
given in Table 1. The chemical composition of magnesium cast anodes shall conform to the requirements
given in Table 2.
2 © ISO 2019 – All rights reserved
Table 1 — Chemical composition of magnesium alloy ingots for anode castings
Material designation Composition in percent (mass fraction)
Alloy
Others Others
group
Symbol Number Element Al Zn Mn Si Fe Cu Ni Mg
each total
min. 2,6 0,7 0,20 — — — — — —
ISO-MBMgAl3Zn1 ISO-MB21130 Remainder
max. 3,5 1,4 1,0 0,08 0,004 0,02 0,001 0,05 0,30
MgAlZn
min. 5,1 2,1 0,20 — — — — — —
ISO-MBMgAl6Zn3 ISO-MB21150 Remainder
max. 7,0 4,0 1,0 0,08 0,004 0,02 0,001 0,05 0,30
min. — — 0,50 — — — — — —
ISO-MBMgMn1 ISO-MB40010 Remainder
max. 0,01 0,05 1,3 0,05 0,01 0,02 0,001 0,05 0,30
MgMn
min. — — 1,20 — — — — — —
ISO-MBMgMn2 ISO-MB40020 Remainder
max. 0,01 0,05 2,5 0,05 0,01 0,02 0,001 0,05 0,30
4 © ISO 2019 – All rights reserved
Table 2 — Chemical composition of magnesium alloy anode castings
Material designation Composition in percent (mass fraction)
Alloy Casting
Others Others
a
group process
Symbol Number Element Al Zn Mn Si Fe Cu Ni Mg
each total
min. 2,5 0,6 0,2 — — — — — —
ISO-MAMgA3Zn1 ISO-MA21130 S, K, C Remainder
max. 3,5 1,4 1,0 0,1 0,005 0,02 0,001 0,05 0,30
MgAlZn
ISO- min. 5,0 2,0 0,2 — — — — — —
ISO-MA21150 S, K, C Remainder
MAMgAl6Zn3 max. 7,0 4,0 1,0 0,1 0,005 0,02 0,002 0,05 0,30
min. — — 0,5 — — — — — —
ISO-MAMgMn1 ISO-MA40010 S, K, C Remainder
max. 0,01 0,05 1,3 0,05 0,01 0,02 0,001 0,05 0,30
MgMn
min. — — 1,2 — — — — — —
ISO-MAMgMn2 ISO-MA40020 S, K, C Remainder
max. 0,01 0,05 2,5 0,05 0,01 0,02 0,001 0,05 0,30
For anodes used in potable (drinking) water, the following specifications shall be met (all in mass fraction): (As + Pb +Cr(VI) + Ni) % ≤ 0,1 % and (Cd + Sb + Se + Hg) % ≤ 0,01 %.
a
S = sand casting, K = permanent mould casting (gravity), C = continuous casting
6 Testing
6.1 Sampling
Samples that are representative of the material shall be produced at a frequency, form and quantity in
accordance with the process quality assurance procedures adopted by the manufacturer or as agreed
between the manufacturer and the purchaser. Samples shall be taken from the molten metal at the time
of casting.
6.2 Determination of the chemical composition
The methods used to determine the chemical composition of the material shall be in accordance with
standardized methods or validated procedures.
NOTE ASTM B953 and ASTM B954 can be used for this purpose.
6.3 Electrochemical testing
If applicable, electrochemical testing shall be carried out in accordance with Annexes A and B.
7 Rounding of numbers
The number representing the result for any value specified in this document shall be expressed to
the same number of decimal places as the corresponding number in this document. Rounding shall
be carried out as specified in ISO 80000-1:2009, B.2 and B.3. In B.3, it is left to the discretion of the
manufacturer as to whether to use rule A or rule B, unless the use of one of the rules has been agreed by
the time of the acceptance of the order.
8 Packaging and surface
...
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