1、Designation: B843 181Standard Specification forMagnesium Alloy Anodes for Cathodic Protection1This standard is issued under the fixed designation B843; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A nu
2、mber in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1NOTEEditorial changes were made to Table 1 in June 2018.1. Scope*1.1 This specification covers magnesium alloy anodes in theform of cast and extrude
3、d shapes.1.2 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBa
4、rriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2B951 Practice for Codification of Unalloyed Magnesium andMagnesium-Alloys, Cast and WroughtB953 Practice for Sampling Magnesium and MagnesiumAlloys for Spectrochemical AnalysisB954 Test Method for Analysis of Magnesium and Ma
5、gne-sium Alloys by Atomic Emission SpectrometryE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE55 Practice for Sampling Wrought Nonferrous Metals andAlloys for Determination of Chemical CompositionE88 Practice for Sampling Nonferrous Metals and Allo
6、ys inCast Form for Determination of Chemical CompositionE527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS)G97 Test Method for Laboratory Evaluation of MagnesiumSacrificial Anode Test Specimens for Underground Appli-cationsE527 Practice for Numbering Metals and Alloys
7、in theUnified Numbering System (UNS)3. Significance and Use3.1 This specification is prescriptive and not performance innature.4. Ordering Information4.1 Orders for anodes under this specification shall includethe following information:4.1.1 Grade (Section 5 and Table 1),4.1.2 Quantity (number of pi
8、eces), and4.1.3 Size, form, and shape as negotiated between purchaserand supplier.5. Chemical Composition5.1 LimitsThe material shall conform to the chemicalcomposition requirements prescribed in Table 1.5.2 Sampling:5.2.1 Sufficient samples shall be taken by the manufacturerto ensure conformance to
9、 the chemical composition require-ments of the metal. Samples may be taken from the moltenmetal when the cast anode or extrusion ingot is pouredfollowing Practice B953, or from the finished anode followingthe requirements of Specifications B954, E55,orE88. Samplesshall be representative of the mater
10、ial.5.2.2 Method of AnalysisAny suitable method of chemicalanalysis may be used. In case of dispute, the results secured byTest Method B954 shall be the basis of acceptance. Roundingof test results obtained shall be performed as directed inASTME29, Standard Practice for Using Significant Digits in T
11、estData to Determine Conformance wi th Specifications, unless analternative rounding method is specified by the customer orapplicable material specification.6. Property Testing6.1 Sufficient samples may be taken for property testing asnegotiated between purchaser and supplier. Testing will bedone in
12、 compliance with Test Method G97.7. General Quality7.1 Magnesium cast and extruded anodes shall have a cleansurface and be commercially free of dirt, slag, or other foreignmaterial.1This specification is under the jurisdiction of ASTM Committee B07 on LightMetals and Alloys and is the direct respons
13、ibility of Subcommittee B07.04 onMagnesium Alloy Cast and Wrought Products.Current edition approved May 1, 2018. Published May 2018. Originallyapproved in 1993. Last previous edition approved in 2013 as B843 13. DOI:10.1520/B0843-18E01.2For referenced ASTM standards, visit the ASTM website, www.astm
14、.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box
15、C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the
16、 World Trade Organization Technical Barriers to Trade (TBT) Committee.18. Rejection8.1 Material that does not conform to the requirements ofthis specification may be rejected, and if rejected, the condi-tions of replacement shall be as agreed upon between thepurchaser and the supplier.9. Packaging a
17、nd Package Marking9.1 The material shall be packaged in such a manner as toprevent damage in ordinary handling and transportation. Thetype of packing and gross weight of the individual containershall be left to the discretion of the supplier, unless otherwiseagreed upon between the purchaser and the
18、 supplier. Packingmethods and containers shall be so selected as to permitmaximum utility of mechanical equipment in unloading andsubsequent handling.9.2 Packages or containers shall be such as to ensureacceptance by common or other carriers for safe transportationat the lowest rate to the point of
19、delivery.9.3 Each shipment shall be marked with the purchasersorder number, form, quantity, specification number, gross andnet weights, and the name of the manufacturer.10. Keywords10.1 cathodic protection; magnesium anodesSUMMARY OF CHANGESCommittee B07 has identified the location of selected chang
20、es to this standard since the last issue (B843 13)that may impact the use of this standard. (Approved May 1, 2018.)(1) Added Practices E29 and E527 to Section 2 (“ReferencedDocuments”).(2) Revised Table 1.(3) Revised 5.2.2.ASTM International takes no position respecting the validity of any patent ri
21、ghts asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at an
22、y time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments w
23、ill receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by A
24、STM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail);
25、or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 1 Chemical Composition RequirementsANOTE 1ASTM alloy designations were established in acco
26、rdance with Practice B951. UNS designations were established in accordance with PracticeE527.Grade UNS Al Zn Mn Si Cu Ni Fe CaOthermetallicimpurities,eachOthers,totalMgAZ63BBM11632 5.36.7 2.53.5 0.150.7 0.10 0.02 0.002 0.003 . . . . . . 0.30 Rem.CAZ63CBM11634 5.36.7 2.53.5 0.150.7 0.30 0.05 0.003 0.
27、003 . . . . . . 0.30 Rem.AZ63DBM11636 5.07.0 2.04.0 0.150.7 0.30 0.10 0.003 0.003 . . . . . . 0.30 Rem.M1C M15102 0.01 . . . 0.501.3 0.05 0.02 0.001 0.03 . . . 0.05 0.30 Rem.AZ31B M11311 2.53.5 0.61.4 0.201.0 0.10 0.05 0.005 0.005 0.04 . . . 0.30 Rem.AZ31D M11313 2.53.5 0.61.4 0.201.0 0.05 0.04 0.0010 0.002 0.04 0.01 0.30 Rem.ALimits are given as maximum weight percent unless shown as a range.BAlloys AZ63B, AZ63C, and AZ63D are commonly known as H1A, H1B, and H1C, respectively.C“Rem.” = “remainder”.B843 1812
