1、Designation: B843 13Standard 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 num
2、ber in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers magnesium alloy anodes in theform of cast and extruded shapes.2. Referenced Documents2.1 ASTM Standards:2B951 P
3、ractice 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 Magne-sium Alloys by Atomic Emission SpectrometryE55 Practice for Sampling Wrought
4、Nonferrous Metals andAlloys for Determination of Chemical CompositionE88 Practice for Sampling Nonferrous Metals and Alloys inCast Form for Determination of Chemical CompositionG97 Test Method for Laboratory Evaluation of MagnesiumSacrificial Anode Test Specimens for Underground Appli-cationsE527 Pr
5、actice for Numbering Metals and Alloys 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 an
6、d Table 1),4.1.2 Quantity (number of pieces), 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 t
7、he manufacturerto ensure conformance to 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. Samp
8、lesshall be representative of the material.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.6. Property Testing6.1 Sufficient samples may be taken for property testing asnegotiated
9、 between purchaser and supplier. Testing will bedone in 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.8. Rejection8.1 Material that does not conform to the requiremen
10、ts 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 and Package Marking9.1 The material shall be packaged in such a manner as toprevent damage in ordinary handling and transportation. Thet
11、ype 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 supplier. Packingmethods and containers shall be so selected as to permitmaximum utility of mechanical equipment in unloading andsubse
12、quent 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 delivery.1This specification is under the jurisdiction of ASTM Committee B07 on LightMetals and Alloys and is the direct responsibility
13、 of Subcommittee B07.04 onMagnesium Alloy Cast and Wrought Products.Current edition approved May 1, 2013. Published June 2013. Originallyapproved in 1993. Last previous edition approved in 2007 as B843 07. DOI:10.1520/B0843-13.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orc
14、ontact 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 C700, Wes
15、t Conshohocken, PA 19428-2959. United States19.3 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 ident
16、ified the location of selected changes to this standard since the last issue (B84307)that may impact the use of this standard. (Approved May 1, 2013.)(1) Added reference to Practice B953 and Test Method B954.(2) Deleted references to withdrawn Test Method E35 (With-drawn 2008).ASTM International tak
17、es no position respecting the validity of any patent rights 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 re
18、sponsibility.This standard is subject to revision at any 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 addres
19、sed to ASTM International Headquarters. Your comments will 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 th
20、e address shown below.This standard is copyrighted by ASTM 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 (ph
21、one), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 1 Chemical RequirementsANOTE 1ASTM alloy designations were established in accordance
22、 with Practice B951. UNS designations were established in accordance with PracticeE527.ElementGradeAZ63BBAZ63CBAZ63DBM1C AZ31B AZ31DUNSM11632 M11634 M11636 M15102 M11311 M11313Aluminum 5.36.7 5.36.7 5.07.0 0.01 2.53.5 2.53.5Zinc 2.53.5 2.53.5 2.04.0 . 0.61.4 0.61.4Manganese 0.150.7 0.150.7 0.150.7 0
23、.501.3 0.201.0 0.201.0Silicon 0.10 0.30 0.30 0.05 0.10 0.05Copper 0.02 0.05 0.10 0.02 0.05 0.04Nickel 0.002 0.003 0.003 0.001 0.005 0.0010Iron 0.003 0.003 0.003 0.03 0.005 0.002Calcium . . . . 0.04 0.04Other metallic impurities,each0.05 . 0.01Others, total 0.30 0.30 0.30 0.30 0.30 0.30Magnesium remainder remainder remainder remainder remainder remainderALimits 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.B843 132
