1、Designation: B 843 07Standard Specification forMagnesium Alloy Anodes for Cathodic Protection1This standard is issued under the fixed designation B 843; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A n
2、umber in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers magnesium alloy anodes in theform of cast and extruded shapes.2. Referenced Documents2.1 ASTM Standards:2B 95
3、1 Practice for Codification of Unalloyed Magnesiumand Magnesium-Alloys, Cast and WroughtE35 Test Methods for Chemical Analysis of Magnesiumand Magnesium AlloysE55 Practice for Sampling Wrought Nonferrous Metals andAlloys for Determination of Chemical CompositionE88 Practice for Sampling Nonferrous M
4、etals and Alloysin Cast Form for Determination of Chemical CompositionG97 Test Method for Laboratory Evaluation of MagnesiumSacrificial Anode Test Specimens for Underground Appli-cationsE 527 Practice for Numbering Metals and Alloys (UNS)3. Significance and Use3.1 This specification is prescriptive
5、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 pieces), and4.1.3 Size, form, and shape as negotiated between purchaserand supplier.5. Chemical Comp
6、osition5.1 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 the chemical composition require-ments of the metal. Samples may be taken from the moltenmetal wh
7、en the cast anode or extrusion ingot is poured, or fromthe finished anode. Samples shall be representative of thematerial.5.2.2 In case of dispute, the sample for chemical analysisshall meet the requirements of Practice E55orE88.5.2.3 Method of AnalysisAny suitable method of chemi-cal analysis may b
8、e used. In case of dispute, the analysis shallbe made by methods given in Test Methods E35.6. Property Testing6.1 Sufficient samples may be taken for property testing asnegotiated between purchaser and supplier. Testing will bedone in compliance with Test Method G97.7. General Quality7.1 Magnesium c
9、ast 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 requirements ofthis specification may be rejected, and if rejected, the condi-tions of replacement shall be as agreed upon between
10、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. Thetype of packing and gross weight of the individual containershall be left to the discretion of the supplier, unless otherw
11、iseagreed upon between the purchaser and the 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 trans
12、portationat 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 of Subcommittee B07.04 onMagnesium Alloy Cast and Wrought Products.Current edition approved June 1, 2007. Published July
13、 2007. Originally approvedin 1993. Last previous edition approved in 2003 as B 843 93(2003).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document S
14、ummary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.9.3 Each shipment shall be marked with the purchasersorder number, form, quantity, specification number, gross andnet weights, and the name of the manufac
15、turer.10. Keywords10.1 cathodic protection; magnesium anodesASTM 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 pa
16、tent rights, and the riskof infringement 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 ei
17、ther for revision of this standard or 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
18、 hearing you shouldmake your views known to the ASTM Committee on Standards, at the 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 stan
19、dard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 1 Chemical RequirementsANOTEASTM alloy designations were established in accordance with Practice B 951. UNS designa
20、tions were established in accordance with PracticeE 527.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 0.501.3 0.201.0 0.201.0Silicon 0
21、.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.B843072
