ASTM B843-18
(Specification)Standard Specification for Magnesium Alloy Anodes for Cathodic Protection
Standard Specification for Magnesium Alloy Anodes for Cathodic Protection
ABSTRACT
This specification covers the standard requirements for magnesium alloy anodes in the form of cast and extruded shapes for use in cathodic protection. Materials shall adhere to specified chemical composition requirements, the samples for analysis of which shall be taken either from the molten metal when the cast anode or extrusion ingot is poured, or from the finished anode. Anodes shall have a clean surface and be commercially free of dirt, slag, or other foreign material.
SIGNIFICANCE AND USE
3.1 This specification is prescriptive and not performance in nature.
SCOPE
1.1 This specification covers magnesium alloy anodes in the form of cast and extruded shapes.
1.2 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Designation:B843 −18
Standard Specification for
1
Magnesium Alloy Anodes for Cathodic Protection
This standard is issued under the fixed designation B843; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 4. Ordering Information
1.1 This specification covers magnesium alloy anodes in the
4.1 Orders for anodes under this specification shall include
form of cast and extruded shapes. the following information:
4.1.1 Grade (Section 5 and Table 1),
1.2 This international standard was developed in accor-
4.1.2 Quantity (number of pieces), and
dance with internationally recognized principles on standard-
4.1.3 Size, form, and shape as negotiated between purchaser
ization established in the Decision on Principles for the
and supplier.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
5. Chemical Composition
Barriers to Trade (TBT) Committee.
5.1 Limits—The material shall conform to the chemical
2. Referenced Documents
composition requirements prescribed in Table 1.
2
2.1 ASTM Standards:
5.2 Sampling:
B951 PracticeforCodificationofUnalloyedMagnesiumand
5.2.1 Sufficient samples shall be taken by the manufacturer
Magnesium-Alloys, Cast and Wrought
to ensure conformance to the chemical composition require-
B953 Practice for Sampling Magnesium and Magnesium
ments of the metal. Samples may be taken from the molten
Alloys for Spectrochemical Analysis
metal when the cast anode or extrusion ingot is poured
B954 Test Method for Analysis of Magnesium and Magne-
following Practice B953, or from the finished anode following
sium Alloys by Atomic Emission Spectrometry
the requirements of Specifications B954, E55,or E88. Samples
E29 Practice for Using Significant Digits in Test Data to
shall be representative of the material.
Determine Conformance with Specifications
5.2.2 MethodofAnalysis—Anysuitablemethodofchemical
E55 Practice for Sampling Wrought Nonferrous Metals and
analysis may be used. In case of dispute, the results secured by
Alloys for Determination of Chemical Composition
Test Method B954 shall be the basis of acceptance. Rounding
E88 Practice for Sampling Nonferrous Metals and Alloys in
of test results obtained shall be performed as directed inASTM
Cast Form for Determination of Chemical Composition
E29, Standard Practice for Using Significant Digits in Test
E527 Practice for Numbering Metals and Alloys in the
DatatoDetermineConformancewithSpecifications,unlessan
Unified Numbering System (UNS)
alternative rounding method is specified by the customer or
G97 Test Method for Laboratory Evaluation of Magnesium
applicable material specification.
SacrificialAnode Test Specimens for UndergroundAppli-
cations
6. Property Testing
E527 Practice for Numbering Metals and Alloys in the
6.1 Sufficient samples may be taken for property testing as
Unified Numbering System (UNS)
negotiated between purchaser and supplier. Testing will be
3. Significance and Use done in compliance with Test Method G97.
3.1 This specification is prescriptive and not performance in
7. General Quality
nature.
7.1 Magnesium cast and extruded anodes shall have a clean
1
surface and be commercially free of dirt, slag, or other foreign
This specification is under the jurisdiction of ASTM Committee B07 on Light
Metals and Alloys and is the direct responsibility of Subcommittee B07.04 on
material.
Magnesium Alloy Cast and Wrought Products.
Current edition approved May 1, 2018. Published May 2018. Originally
8. Rejection
approved in 1993. Last previous edition approved in 2013 as B843 – 13. DOI:
10.1520/B0843-18.
8.1 Material that does not conform to the requirements of
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
this specification may be rejected, and if rejected, the condi-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
tions of replacement shall be as agreed upon between the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. purchaser and the supplier.
*A Summary of Changes section appears at the end of this standard
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959. United States
1
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B843−18
A
TABLE 1 Chemical Composition Requirements
NOTE 1—ASTM alloy designations were established in accordance with Practice B951. UNS designations were established in accordance with Practice
E527.
Other
metallic Others,
Grade UNS Al Zn Mn Si Cu Ni Fe Ca Mg
impurities, total
each
B
AZ63B M11632 5.3–6.7 2.
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B843 − 13 B843 − 18
Standard Specification for
1
Magnesium Alloy Anodes for Cathodic Protection
This standard is issued under the fixed designation B843; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This specification covers magnesium alloy anodes in the form of cast and extruded shapes.
1.2 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
B951 Practice for Codification of Unalloyed Magnesium and Magnesium-Alloys, Cast and Wrought
B953 Practice for Sampling Magnesium and Magnesium Alloys for Spectrochemical Analysis
B954 Test Method for Analysis of Magnesium and Magnesium Alloys by Atomic Emission Spectrometry
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E55 Practice for Sampling Wrought Nonferrous Metals and Alloys for Determination of Chemical Composition
E88 Practice for Sampling Nonferrous Metals and Alloys in Cast Form for Determination of Chemical Composition
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
G97 Test Method for Laboratory Evaluation of Magnesium Sacrificial Anode Test Specimens for Underground Applications
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
3. Significance and Use
3.1 This specification is prescriptive and not performance in nature.
4. Ordering Information
4.1 Orders for anodes under this specification shall include the following information:
4.1.1 Grade (Section 5 and Table 1),
4.1.2 Quantity (number of pieces), and
4.1.3 Size, form, and shape as negotiated between purchaser and supplier.
5. Chemical Composition
5.1 Limits—The material shall conform to the chemical composition requirements prescribed in Table 1.
5.2 Sampling:
5.2.1 Sufficient samples shall be taken by the manufacturer to ensure conformance to the chemical composition requirements
of the metal. Samples may be taken from the molten metal when the cast anode or extrusion ingot is poured following Practice
B953, or from the finished anode following the requirements of Specifications B954, E55, or E88. Samples shall be representative
of the material.
5.2.2 Method of Analysis—Any suitable method of chemical analysis may be used. In case of dispute, the results secured by Test
Method B954 shall be the basis of acceptance. Rounding of test results obtained shall be performed as directed in ASTM E29,
1
This specification is under the jurisdiction of ASTM Committee B07 on Light Metals and Alloys and is the direct responsibility of Subcommittee B07.04 on Magnesium
Alloy Cast and Wrought Products.
Current edition approved May 1, 2013May 1, 2018. Published June 2013May 2018. Originally approved in 1993. Last previous edition approved in 20072013 as
B843 – 07.B843 – 13. DOI: 10.1520/B0843-13.10.1520/B0843-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
B843 − 18
A
TABLE 1 Chemical Requirements
NOTE 1—ASTM alloy designations were established in accordance with Practice B951. UNS designations were established in accordance with Practice
E527.
Grade
B B B
AZ63B AZ63C AZ63D M1C AZ31B AZ31D
Element
UNS
M11632 M11634 M11636 M15102 M11311 M11313
Aluminum 5.3–6.7 5.3–6.7 5.0–7.0 0.01 2.5–3.5 2.5–3.5
Zinc 2.5–3.5 2.5–3.5 2.0–4.0 . 0.6–1.4 0.6–1.4
Manga- 0.15–0.7 0.15–0.7 0.15–0.7 0.50–1.3 0.20–1.0 0.20–1.0
nese
Silicon 0.10 0.30 0.30 0.05 0.10 0.05
Copper 0.02 0.05 0.10 0.02 0.05 0.04
Nickel 0.002 0.003 0.003 0.001 0.005 0.0010
Iron 0.003 0.003 0.003 0.03 0.005 0.002
Calcium . . . . 0.04 0.04
Other me-
tallic
0.05 . 0.01
impurities,
each
Others, 0.3
...
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