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ASTM B843-18e1

(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.

General Information

Status
Published
Publication Date
30-Apr-2018
ICS
77.060 - Corrosion of metals
Technical Committee
B07 - Light Metals and Alloys
Drafting Committee
B07.04 - Magnesium Alloy Cast and Wrought Products
Current Stage
Ref Project

Relations

Replaces
ASTM B843-18 - Standard Specification for Magnesium Alloy Anodes for Cathodic Protection
Effective Date
01-May-2018
Refers
ASTM E88-11(2017) - Standard Practice for Sampling Nonferrous Metals and Alloys in Cast Form for Determination of Chemical Composition
Effective Date
01-Sep-2017
Refers
ASTM B951-11(2018) - Standard Practice for Codification of Unalloyed Magnesium and Magnesium-Alloys, Cast and Wrought
Effective Date
01-May-2018

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ASTM B843-18e1 - Standard Specification for Magnesium Alloy Anodes for Cathodic ProtectionASTM B843-18e1 - Standard Specification for Magnesium Alloy Anodes for Cathodic Protection
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ASTM B843-18e1 - Standard Specification for Magnesium Alloy Anodes for Cathodic Protection
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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.
´1
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
ε NOTE—Editorial changes were made to Table 1 in June 2018.
1. Scope* 3. Significance and Use
3.1 This specification is prescriptive and not performance in
1.1 This specification covers magnesium alloy anodes in the
nature.
form of cast and extruded shapes.
1.2 This international standard was developed in accor-
4. Ordering Information
dance with internationally recognized principles on standard-
4.1 Orders for anodes under this specification shall include
ization established in the Decision on Principles for the
the following information:
Development of International Standards, Guides and Recom-
4.1.1 Grade (Section 5 and Table 1),
mendations issued by the World Trade Organization Technical
4.1.2 Quantity (number of pieces), and
Barriers to Trade (TBT) Committee.
4.1.3 Size, form, and shape as negotiated between purchaser
and supplier.
2. Referenced Documents
2
2.1 ASTM Standards:
5. Chemical Composition
B951 PracticeforCodificationofUnalloyedMagnesiumand
5.1 Limits—The material shall conform to the chemical
Magnesium-Alloys, Cast and Wrought
composition requirements prescribed in Table 1.
B953 Practice for Sampling Magnesium and Magnesium
Alloys for Spectrochemical Analysis 5.2 Sampling:
B954 Test Method for Analysis of Magnesium and Magne- 5.2.1 Sufficient samples shall be taken by the manufacturer
sium Alloys by Atomic Emission Spectrometry to ensure conformance to the chemical composition require-
ments of the metal. Samples may be taken from the molten
E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications metal when the cast anode or extrusion ingot is poured
following Practice B953, or from the finished anode following
E55 Practice for Sampling Wrought Nonferrous Metals and
Alloys for Determination of Chemical Composition the requirements of Specifications B954, E55,or E88. Samples
shall be representative of the material.
E88 Practice for Sampling Nonferrous Metals and Alloys in
Cast Form for Determination of Chemical Composition 5.2.2 MethodofAnalysis—Anysuitablemethodofchemical
analysis may be used. In case of dispute, the results secured by
E527 Practice for Numbering Metals and Alloys in the
Unified Numbering System (UNS) Test Method B954 shall be the basis of acceptance. Rounding
of test results obtained shall be performed as directed inASTM
G97 Test Method for Laboratory Evaluation of Magnesium
SacrificialAnode Test Specimens for UndergroundAppli- E29, Standard Practice for Using Significant Digits in Test
DatatoDetermineConformancewithSpecifications,unlessan
cations
E527 Practice for Numbering Metals and Alloys in the alternative rounding method is specified by the customer or
Unified Numbering System (UNS) applicable material specification.
6. Property Testing
1 6.1 Sufficient samples may be taken for property testing as
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
negotiated between purchaser and supplier. Testing will be
Magnesium Alloy Cast and Wrought Products.
done in compliance with Test Method G97.
Current edition approved May 1, 2018. Published May 2018. Originally
approved in 1993. Last previous edition approved in 2013 as B843 – 13. DOI:
7. General Quality
10.1520/B0843-18E01.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7.1 Magnesium cast and extruded anodes shall have a clean
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
surface and be commercially free of dirt, slag, or other foreign
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. material.
*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

---------------------- Page: 1 ----------------------
´1
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 C
AZ63B M11632
...

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1.1 This terminology and acronyms standard covers and defines commonly used terms and acronyms in the field of corrosion. Related terms may be found in Terminologies D16, D4538, G40, or other ASTM terminology standards.  
1.2 This terminology and acronyms standard is a result of an agreement between NACE International and ASTM International Committee G01 on Corrosion of Metals and may not reflect the opinions of other ASTM committees.  
1.3 In this terminology and acronyms standard, brackets are used for directives that follow a definition and are obviously not part of it, such as, “[see XXX]” and “[also known as XXX].” Brackets can also indicate the field of application or context of the definition or acronym.  
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4.1 This practice provides for periodic testing for resistance to wet conditions during storage to compare the relative performance of specific combinations of coatings, substrates, and/or pretreatments used on coil-coated metal. The results must be considered relative and do not indicate absolute performance.  
4.2 When stored improperly, coil-coated building panel stacks can be exposed to rainwater, which flows into gaps between panels by capillary action or gravity, and remains in the gaps because of poor drainage conditions. Such a condition is known as a “wet stack” and may cause blistering and corrosion of the painted surfaces. This practice simulates such improper storage conditions.  
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