1、Designation: B843 13B843 18Standard 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
2、. A number 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 the form of cast and extruded shapes.1.2 This international standard was devel
3、oped in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documen
4、ts2.1 ASTM Standards:2B951 Practice for Codification of Unalloyed Magnesium and Magnesium-Alloys, Cast and WroughtB953 Practice for Sampling Magnesium and Magnesium Alloys for Spectrochemical AnalysisB954 Test Method for Analysis of Magnesium and Magnesium Alloys by Atomic Emission SpectrometryE29 P
5、ractice for Using Significant Digits in Test Data to Determine Conformance with SpecificationsE55 Practice for Sampling Wrought Nonferrous Metals and Alloys for Determination of Chemical CompositionE88 Practice for Sampling Nonferrous Metals and Alloys in Cast Form for Determination of Chemical Comp
6、ositionE527 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 ApplicationsE527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)3. Signific
7、ance and Use3.1 This specification is prescriptive and not performance in nature.4. Ordering Information4.1 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), and4.1.3 Size, form, and shape as nego
8、tiated between purchaser and supplier.5. Chemical Composition5.1 LimitsThe 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 requirementsof t
9、he metal. Samples may be taken from the molten metal when the cast anode or extrusion ingot is poured following PracticeB953, or from the finished anode following the requirements of Specifications B954, E55, or E88. Samples shall be representativeof the material.5.2.2 Method of AnalysisAny suitable
10、 method of chemical analysis may be used. In case of dispute, the results secured by TestMethod 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 ofASTM Committee B07 on Light Metals andA
11、lloys and is the direct responsibility of Subcommittee B07.04 on MagnesiumAlloy 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 asB843 07.B843 13. DOI: 10.1520/B0843-13.10.
12、1520/B0843-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is in
13、tended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit 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 cur
14、rent versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1Standard Practice for Using Si
15、gnificant Digits in Test Data to Determine Conformance wi th Specifications, unless an alternativerounding method is specified by the customer or applicable material specification.6. Property Testing6.1 Sufficient samples may be taken for property testing as negotiated between purchaser and supplier
16、. Testing will be done incompliance with Test Method G97.7. General Quality7.1 Magnesium cast and extruded anodes shall have a clean surface and be commercially free of dirt, slag, or other foreignmaterial.8. Rejection8.1 Material that does not conform to the requirements of this specification may b
17、e rejected, and if rejected, the conditions ofreplacement shall be as agreed upon between the purchaser and the supplier.9. Packaging and Package Marking9.1 The material shall be packaged in such a manner as to prevent damage in ordinary handling and transportation. The typeof packing and gross weig
18、ht of the individual container shall be left to the discretion of the supplier, unless otherwise agreed uponbetween the purchaser and the supplier. Packing methods and containers shall be so selected as to permit maximum utility ofmechanical equipment in unloading and subsequent handling.9.2 Package
19、s or containers shall be such as to ensure acceptance by common or other carriers for safe transportation at thelowest rate to the point of delivery.TABLE 1 Chemical RequirementsANOTE 1ASTM alloy designations were established in accordance with Practice B951. UNS designations were established in acc
20、ordance with PracticeE527.ElementGradeAZ63BB AZ63CB AZ63DB M1C 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 0.61.4Manga-nese0.150.7 0.150.7 0.150.7 0.501.3 0.201.0 0.201.0Silicon 0.10 0.30 0.30 0.05 0.10 0.0
21、5Copper 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 me-tallicimpurities,each0.05 . 0.01Others,total0.30 0.30 0.30 0.30 0.30 0.30Magne-siumremainder remainder remainder remainder remainder remainderTABLE
22、 1 Chemical Composition RequirementsANOTE 1ASTM alloy designations were established in accordance with Practice B951. UNS designations were established in accordance with PracticeE527.Grade UNS Al Zn Mn Si Cu Ni Fe CaOthermetallicimpurities,eachOthers,total MgAZ63BB M11632 5.36.7 2.53.5 0.150.7 0.10
23、 0.02 0.002 0.003 . . . . . . 0.30 Rem.AZ63CB M11634 5.36.7 2.53.5 0.150.7 0.30 0.05 0.003 0.003 . . . . . . 0.30 Rem.AZ63DB M11636 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
24、.0 0.10 0.05 0.005 0.002 0.04 . . . 0.30 Rem.AZ31D M11313 2.53.5 0.61.4 0.201.0 0.05 0.04 0.0010 0.005 0.04 0.01 0.30 Rem.A Limits are given as maximum weight percent unless shown as a range.B Alloys AZ63B, AZ63C, and AZ63D are commonly known as H1A, H1B, and H1C, respectively.B843 1829.3 Each shipm
25、ent shall be marked with the purchasers order number, form, quantity, specification number, gross and netweights, and the name of the manufacturer.10. Keywords10.1 cathodic protection; magnesium anodesSUMMARY OF CHANGESCommittee B07 has identified the location of selected changes to this standard si
26、nce the last issue(B843B843 1307) that may impact the use of this standard. (Approved May 1, 2013May 1, 2018.)(1) Added reference to Practice Practices B953E29 and TestE527 Methodto B954.Section 2 (“Referenced Documents”).(2) Deleted references to withdrawn Test Method Revised Table 1.E35 (Withdrawn
27、 2008).(3) Revised 5.2.2.ASTM International takes 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 infring
28、ement of such rights, are entirely their own responsibility.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 o
29、r for additional standardsand should be addressed 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 k
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