ASTM B943-16(2022)
(Specification)Standard Specification for Zinc and Tin Alloy Wire Used in Thermal Spraying for Electronic Applications
Standard Specification for Zinc and Tin Alloy Wire Used in Thermal Spraying for Electronic Applications
ABSTRACT
This specification covers zinc and tin alloy wire, including zinc-aluminum, zinc-aluminum-copper, zinc-tin, zinc-tin-copper an dtin-zinc, used as thermal spray wire in the electronics industry. The wire shall conform to the required chemical composition for cadmium, zinc, tin, lead, antimony, copper, aluminum, bismuth, arsenic, iron, nickel, and magnesium. The wire shall be clean and free of corrosion, adhering foreign material, scale, seams, nicks, burrs, and other defects which would interfere with the operation of thermal spraying equipment. The wire shall uncoil readily and be free of bends or kinks that would prevent its passage through the thermal spray gun. Sampling methodology should ensure that the sample slected for testing is representative of the matreial. The diameter of the wire shall be determines at the end and the beginning of each continuous wire.
SCOPE
1.1 This specification covers zinc and tin alloy wire, including zinc-aluminum, zinc-aluminum-copper, zinc-tin, zinc-tin-copper and tin-zinc, used as thermal spray wire in the electronics industry.
1.1.1 Certain alloys specified in this standard are also used as solders for the purpose of joining together two or more metals at temperatures below their melting points, and for other purposes (as noted in Annex A1). Specification B907 covers Zinc, Tin and Cadmium Base Alloys Used as Solders which are used primarily for the purpose of joining together two or more metals at temperatures below their melting points and for other purposes (as noted in the Annex part of Specification B907). Specification B833 covers Zinc and Zinc Alloy Wire for Thermal Spraying (Metallizing) used primarily for the corrosion protection of steel (as noted in the Annex part of Specification B833).
1.1.2 Tin base alloys are included in this specification because their use in the electronics industry is similar to the use of certain zinc alloys but different than the major use of the tin and lead solder compositions specified in Specification B32.
1.1.3 These wire alloys have a nominal liquidus temperature not exceeding 850 °F (455 °C).
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.
1.4 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
Relations
Standards Content (Sample)
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.
Designation:B943 −16 (Reapproved 2022)
Standard Specification for
Zinc and Tin Alloy Wire Used in Thermal Spraying for
Electronic Applications
This standard is issued under the fixed designation B943; 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. Scope 1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 This specification covers zinc and tin alloy wire, includ-
ization established in the Decision on Principles for the
ing zinc-aluminum, zinc-aluminum-copper, zinc-tin, zinc-tin-
Development of International Standards, Guides and Recom-
copper and tin-zinc, used as thermal spray wire in the elec-
mendations issued by the World Trade Organization Technical
tronics industry.
Barriers to Trade (TBT) Committee.
1.1.1 Certain alloys specified in this standard are also used
as solders for the purpose of joining together two or more
2. Referenced Documents
metalsattemperaturesbelowtheirmeltingpoints,andforother
2.1 ASTM Standards:
purposes (as noted in Annex A1). Specification B907 covers
B32 Specification for Solder Metal
Zinc,TinandCadmiumBaseAlloysUsedasSolderswhichare
B527 Test Method for Tap Density of Metal Powders and
used primarily for the purpose of joining together two or more
Compounds
metals at temperatures below their melting points and for other
B833 Specification for Zinc and Zinc Alloy Wire for Ther-
purposes (as noted in the Annex part of Specification B907).
malSpraying(Metallizing)fortheCorrosionProtectionof
Specification B833 covers Zinc and Zinc Alloy Wire for
Steel
Thermal Spraying (Metallizing) used primarily for the corro-
B899 Terminology Relating to Non-ferrous Metals and Al-
sion protection of steel (as noted in the Annex part of
loys
Specification B833).
B907 Specification for Zinc, Tin and Cadmium Base Alloys
1.1.2 Tin base alloys are included in this specification
Used as Solders
becausetheiruseintheelectronicsindustryissimilartotheuse
B949 Specification for General Requirements for Zinc and
of certain zinc alloys but different than the major use of the tin
Zinc Alloy Products
and lead solder compositions specified in Specification B32.
E29 Practice for Using Significant Digits in Test Data to
1.1.3 Thesewirealloyshaveanominalliquidustemperature
Determine Conformance with Specifications
not exceeding 850 °F (455 °C).
E46 Test Methods for Chemical Analysis of Lead- and
1.2 The values stated in inch-pound units are to be regarded
Tin-Base Solder (Withdrawn 1994)
as standard. The values given in parentheses are mathematical
E51 Method for Spectrographic Analysis of Tin Alloys by
conversions to SI units that are provided for information only
the Powder Technique (Withdrawn 1983)
and are not considered standard.
E87 Methods for ChemicalAnalysis of Lead,Tin,Antimony
1.3 This standard does not purport to address all of the
and Their Alloys (Photometric Method) (Withdrawn
safety concerns, if any, associated with its use. It is the
1983)
responsibility of the user of this standard to become familiar
E536 Test Methods for Chemical Analysis of Zinc and Zinc
with all hazards including those identified in the appropriate
Alloys
Safety Data Sheet (SDS) for this product/material as provided
2.2 Federal Standard:
by the manufacturer, to establish appropriate safety, health,
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
and environmental practices, and determine the applicability
of regulatory limitations prior to use.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
This specification is under the jurisdiction of ASTM Committee B02 on Standards volume information, refer to the standard’s Document Summary page on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee the ASTM website.
B02.04 on Zinc and Cadmium. The last approved version of this historical standard is referenced on
Current edition approved April 1, 2022. Published April 2022. Originally www.astm.org.
approved in 2005. Last previous edition approved in 2016 as B943 – 16. DOI: Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
10.1520/B0943-16R22. Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B943−16 (2022)
2.3 ISO Standards: 6. Materials and Manufacture
ISO 3815-1 Zinc and zinc alloys — Part 1:Analysis of solid
6.1 See Specification B949.
samples by optical emission spectrometry
ISO 3815-2 Zinc and zinc alloys — Part 2: Analysis by 7. Chemical Composition
inductively coupled plasma optical emission spectrometry
7.1 The wire shall conform to the requirements prescribed
2.4 Military Standard:
in Table 1.
MIL-STD-129 Marking for Shipment and Storage
7.2 The manufacturer shall perform chemical analyses as
directed in Test Methods E536 or by other methods of at least
3. Terminology
equal accuracy to confirm that the wire conforms to the
3.1 Terms shall be defined in accordance with Terminology
requirements of composition. In case of dispute, analysis by
B899.
Test Methods E536 shall be accepted. Analysis of alloy wires
not covered by Test Methods E536 shall be agreed upon
4. Classification
between the manufacturer and the purchaser.
4.1 Type Designation—The type designation uses the fol-
NOTE 1—By mutual agreement between supplier and purchaser, analy-
lowing symbols to properly identify the material:
sis may be required and limits established for elements or compounds not
4.1.1 Alloy Composition—The composition is identified by
specified in Table 1.
a two or four-letter symbol and a number. The letters typically
8. Dimensions and Unit Weight
indicate the chemical symbol for the critical element(s) in the
wire and the number indicates the nominal percentage, by
8.1 The dimensions and unit weight of wire are specified in
weight, of the primary element in the wire (see Table 1).
5.1.3 and 5.1.4. The tolerance on specified outside diameter
shall be 65%or 60.002 in. (0.05 mm), whichever is greater.
5. Ordering Information
9. Workmanship, Finish, and Appearance
5.1 Orders for material under this specification indicate the
following information, as required, to adequately describe the 9.1 See Specification B949.
desired material.
9.2 The wire shall be a continuous length per spool, coil, or
5.1.1 Type designation (see 4.1),
drum. Splices or welds are permitted, provided that they do not
5.1.2 Detailed requirements for special forms,
interfere with the thermal spray equipment or coating process.
5.1.3 Dimensions of wire (see 9.2),
9.3 The starting end of each coil shall be tagged to indicate
5.1.4 Unit weight,
winding direction and to be readily identifiable with ASTM
5.1.5 Packaging (see Section 17),
designation.
5.1.6 Marking (see Section 16),
5.1.7 ASTM Specification number and issue, marked on (a)
10. Sampling
purchase order and (b) package or spool, and
10.1 Sampling methodology should ensure that the sample
5.1.8 Special requirements, as agreed upon between sup-
selected for testing is representative of the material. The
plier and purchaser.
method for sampling consists of one of the following methods:
10.1.1 Analysis may be performed on finished wire, on
material selected when the wire is cast, or on samples taken
from semi-finished wire.
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036, http://www.ansi.org.
TABLE 1 Zinc and Zinc Alloy Wire Compositions
A,B,C
Composition % Temperature
D
FCFC UNS Cd Zn Sn Pb Sb Ag Cu Al Bi As Fe Ni Mg Solidus Liquidus
Zn 98 Z30402 0.005 REM 0.003 0.005 0.10 0.015 0.005 1.5–2.5 0.02 0.002 0.02 0.005 0.02 720 382 770 410
Zn 96 Z30506 0.005 REM 0.003 0.005 0.10 0.015 0.005 3.5–4.5 0.02 0.002 0.02 0.005 0.02 720 382 720 382
Zn 95 Z30502 0.005 REM 0.003 0.005 0.10 0.015 0.005 4.5–5.5 0.02 0.002 0.02 0.005 0.02 720 382 720 382
Zn 94 Z34530 0.005 REM 0.003 0.005 0.10 0.015 1.3–1.5 3.5–4.5 0.02 0.002 0.02 0.005 0.02 730 388 734 390
Zn 87 Z30705 0.005 REM 0.003 0.005 0.10 0.015 0.005 12.5–13.5 0.02 0.002 0.05 0.005 0.02 720 382 815 435
Zn 85 Z30702 0.005 REM 0.003 0.005 0.10 0.015 0.005 14.0–16.0 0.02 0.002 0.06 0.005 0.02 720 382 842 450
Zn/Sn 50 Z56900 0.005 REM 49.0–51.0 0.05 0.10 0.015 0.005 0.100 0.02 0.0
...
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