ASTM B843-13
(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.
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Designation:B843 −13
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* 5. Chemical Composition
1.1 This specification covers magnesium alloy anodes in the 5.1 Limits—The material shall conform to the chemical
form of cast and extruded shapes. composition requirements prescribed in Table 1.
5.2 Sampling:
2. Referenced Documents
5.2.1 Sufficient samples shall be taken by the manufacturer
2
2.1 ASTM Standards: to ensure conformance to the chemical composition require-
B951 PracticeforCodificationofUnalloyedMagnesiumand
ments of the metal. Samples may be taken from the molten
Magnesium-Alloys, Cast and Wrought metal when the cast anode or extrusion ingot is poured
B953 Practice for Sampling Magnesium and Magnesium
following Practice B953, or from the finished anode following
Alloys for Spectrochemical Analysis the requirements of Specifications B954, E55,or E88. Samples
B954 Test Method for Analysis of Magnesium and Magne-
shall be representative of the material.
sium Alloys by Atomic Emission Spectrometry 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.
E88 Practice for Sampling Nonferrous Metals and Alloys in
6. Property Testing
Cast Form for Determination of Chemical Composition
G97 Test Method for Laboratory Evaluation of Magnesium
6.1 Sufficient samples may be taken for property testing as
SacrificialAnode Test Specimens for UndergroundAppli-
negotiated between purchaser and supplier. Testing will be
cations
done in compliance with Test Method G97.
E527 Practice for Numbering Metals and Alloys in the
7. General Quality
Unified Numbering System (UNS)
7.1 Magnesium cast and extruded anodes shall have a clean
3. Significance and Use
surface and be commercially free of dirt, slag, or other foreign
material.
3.1 This specification is prescriptive and not performance in
nature.
8. Rejection
4. Ordering Information
8.1 Material that does not conform to the requirements of
this specification may be rejected, and if rejected, the condi-
4.1 Orders for anodes under this specification shall include
tions of replacement shall be as agreed upon between the
the following information:
purchaser and the supplier.
4.1.1 Grade (Section 5 and Table 1),
4.1.2 Quantity (number of pieces), and
9. Packaging and Package Marking
4.1.3 Size, form, and shape as negotiated between purchaser
9.1 The material shall be packaged in such a manner as to
and supplier.
prevent damage in ordinary handling and transportation. The
type of packing and gross weight of the individual container
shall be left to the discretion of the supplier, unless otherwise
1
This specification is under the jurisdiction of ASTM Committee B07 on Light
agreed upon between the purchaser and the supplier. Packing
Metals and Alloys and is the direct responsibility of Subcommittee B07.04 on
Magnesium Alloy Cast and Wrought Products.
methods and containers shall be so selected as to permit
Current edition approved May 1, 2013. Published June 2013. Originally
maximum utility of mechanical equipment in unloading and
approved in 1993. Last previous edition approved in 2007 as B843 – 07. DOI:
subsequent handling.
10.1520/B0843-13.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
9.2 Packages or containers shall be such as to ensure
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
acceptance by common or other carriers for safe transportation
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. at the lowest rate to the point of delivery.
*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
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B843−13
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
Manganese 0.15–0.7 0.15–0.7 0.15–0.7 0.50–1.3 0.20–1.0 0.20–1.0
Sili
...
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 − 07 B843 − 13
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 Scope*
1.1 This specification covers magnesium alloy anodes in the form of cast and extruded shapes.
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
E35B954 Test MethodsMethod for Chemical Analysis of Magnesium and Magnesium Alloys by Atomic Emission Spectrometry
(Withdrawn 2008)
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
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, poured following
Practice B953, or from the finished anode. anode following the requirements of Specifications B954, E55, or E88. Samples shall
be representative of the material.
5.2.2 In case of dispute, the sample for chemical analysis shall meet the requirements of Practice E55 or E88.
5.2.2 Method of Analysis—Any suitable method of chemical analysis may be used. In case of dispute, the analysis shall be made
by methods given in Test Methodsresults secured by Test Method E35B954. shall be the basis of acceptance.
6. Property Testing
6.1 Sufficient samples may be taken for property testing as negotiated between purchaser and supplier. Testing will be done in
compliance with Test Method G97.
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 June 1, 2007May 1, 2013. Published July 2007June 2013. Originally approved in 1993. Last previous edition approved in 20032007 as
B843 – 93B843 – 07.(2003). DOI: 10.1520/B0843-07.10.1520/B0843-13.
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 − 13
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
Manganese 0.15–0.7 0.15–0.7 0.15–0.7 0.50–1.3 0.20–1.0 0.20–1.0
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 metallic impurities, 0.05 . 0.01
each
Others, total 0.30 0.30 0.30 0.30 0.30 0.30
Magnesium remainder remainder remainder remainder remainder remainder
A
TABLE 1 Chemical Requirements
NOTE 1—ASTM alloy designations were
...
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