ASTM A630-16a
(Test Method)Standard Test Methods for Determination of Tin Coating Weights for Electrolytic Tin Plate
Standard Test Methods for Determination of Tin Coating Weights for Electrolytic Tin Plate
SIGNIFICANCE AND USE
20.1 This test method covers determination of the total tin in the sample tested and does not apportion the tin to one or the other side of the test specimen. The calculations appearing in Section 27 assume uniform distribution of tin over the two surfaces.
20.2 This test method does not differentiate between free tin on the tinplate surface, tin combined with iron in the intermediate alloy layer, or tin alloyed with the steel as a residual tramp element.
SCOPE
1.1 These test methods include four methods for the determination of tin coating weights for electrolytic tin plate as follows:
Test Method
Sections
A—Bendix Test Method
3 to 9
B—Constant-Current, Electrolytic Test Method (Referee Method)
10 to 17
C—Sellar's Test Method
18 to 27
D—Titration Test Method
28 to 36
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 establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: A630 − 16a
Standard Test Methods for
Determination of Tin Coating Weights for Electrolytic Tin
1
Plate
This standard is issued under the fixed designation A630; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
INTRODUCTION
Four test methods for determination of tin coating weights are described.These are typical methods
and represent those most commonly used in the tin plate industry. Publication of these test methods
is not intended to preclude the use of any other methods such as X-ray fluorescence measurement
systems for control purposes by the consumer or supplier. However, in case of dispute, the referee
method is to be used to determine conformance to Specification A624/A624M and Specification
A626/A626M.
Sampling procedures for tin coating-weight testing and applicable standards for the specific class
designation are outlined in Specification A624/A624M and Specification A626/A626M.
1. Scope 2. Referenced Documents
2
1.1 These test methods include four methods for the deter- 2.1 ASTM Standards:
mination of tin coating weights for electrolytic tin plate as A624/A624M Specification for Tin Mill Products, Electro-
follows: lytic Tin Plate, Single Reduced
A626/A626M Specification for Tin Mill Products, Electro-
Test Method Sections
A—Bendix Test Method 3 to 9
lytic Tin Plate, Double Reduced
B—Constant-Current, Electrolytic Test Method (Referee Method) 10 to 17
D1125 Test Methods for Electrical Conductivity and Resis-
C—Sellar’s Test Method 18 to 27
tivity of Water
D—Titration Test Method 28 to 36
METHOD A—DETERMINATION OF THE TIN
1.2 The values stated in inch-pound units are to be regarded
COATING WEIGHTS BY THE BENDIX TEST
as standard. The values given in parentheses are mathematical
METHOD
conversions to SI units that are provided for information only
and are not considered standard.
3. Scope
1.3 This standard does not purport to address all of the
3.1 This test method covers the determination of tin coating
safety concerns, if any, associated with its use. It is the
weights on steel plate.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Summary of Test Method
bility of regulatory limitations prior to use.
4.1 The procedure involves dissolution of tin from a tin
plate anode in a dilute hydrochloric acid solution containing a
1
These test methods are under the jurisdiction of ASTM Committee A01 on
Steel, Stainless Steel and Related Alloys and are the direct responsibility of
2
Subcommittee A01.20 on Tin Mill Products. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Dec. 1, 2016. Published December 2016. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1968. Last previous edition approved in 2016 as A630 - 16. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/A0630-16A. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A630 − 16a
measured excess of standard potassium iodate-potassium io- 6.4 Potassium Iodate-Potassium Iodide, Standard Solution
dide solution. Excess iodine from the iodate-iodide solution is (0.0975 N)—Dissolve 3.48 g of KIO , 21.74 g of KI, and 1.21
3
back titrated with standard sodium thiosulfate using a starch
g of NaOH in 1 L of distilled water. Standardize as follows:
indicator.
Transfer 0.2700 g of National Bureau of Standards tin to a
500-mLErlenmeyer flask.Add 200 mLof HCl (1+1). Connect
3
5. Apparatus
the flask to a carbon dioxide (CO ) system and displace the air
2
in the flask with CO . While continuing the flow of CO , heat
5.1 The detinning cell consists essentially of two cathodes 2 2
the flask but do not boil violently. After the tin has dissolved
of carbon rod, the sample that serves as an anode, and a beaker
add 0.5 g of antimony and2gof high-purity aluminum. Heat
of dilute hydrochloric acid electrolyte. The carbon rods (6 by
until the aluminum is completely dissolved and digest for an
0.25 in. or 152 by 6.35 mm, encased in porous porcelain
additional 10 min. Cool the flask to room temperature in
thimbles) are suspended from a suitable frame about 1 in.
running water while maintaining an atmosphere of CO .
(25 mm) apart. A small glass-enclosed magnet is atta
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it 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 current version
of the standard as published by ASTM is to be considered the official document.
Designation: A630 − 16 A630 − 16a
Standard Test Methods for
Determination of Tin Coating Weights for Electrolytic Tin
1
Plate
This standard is issued under the fixed designation A630; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
INTRODUCTION
Four test methods for determination of tin coating weights are described. These are typical methods
and represent those most commonly used in the tin plate industry. Publication of these test methods
is not intended to preclude the use of any other methods such as X-ray fluorescence measurement
systems for control purposes by the consumer or supplier. However, in case of dispute, the referee
method is to be used to determine conformance to Specification A624/A624M and Specification
A626/A626M.
Sampling procedures for tin coating-weight testing and applicable standards for the specific class
designation are outlined in Specification A624/A624M and Specification A626/A626M.
1. Scope
1.1 These test methods include four methods for the determination of tin coating weights for electrolytic tin plate as follows:
Test Method Sections
A—Bendix Test Method 3 to 9
B—Constant-Current, Electrolytic Test Method (Referee Method) 10 to 18
B—Constant-Current, Electrolytic Test Method (Referee Method) 10 to 17
C—Sellar’s Test Method 19 to 28
C—Sellar’s Test Method 18 to 27
D—Titration Test Method 29 to 37
D—Titration Test Method 28 to 36
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 establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
A624/A624M Specification for Tin Mill Products, Electrolytic Tin Plate, Single Reduced
A626/A626M Specification for Tin Mill Products, Electrolytic Tin Plate, Double Reduced
D1125 Test Methods for Electrical Conductivity and Resistivity of Water
METHOD A—DETERMINATION OF THE TIN COATING WEIGHTS BY THE BENDIX TEST METHOD
3. Scope
3.1 This test method covers the determination of tin coating weights on steel plate.
1
These test methods are under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and are the direct responsibility of Subcommittee
A01.20 on Tin Mill Products.
Current edition approved May 1, 2016Dec. 1, 2016. Published September 2016December 2016. Originally approved in 1968. Last previous edition approved in 20142016
as A630 - 03A630 - 16.(2014). DOI: 10.1520/A0630-16.10.1520/A0630-16A.
2
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 Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A630 − 16a
4. Summary of Test Method
4.1 The procedure involves dissolution of tin from a tin plate anode in a dilute hydrochloric acid solution containing a measured
excess of standard potassium iodate-potassium iodide solution. Excess iodine from the iodate-iodide solution is back titrated with
standard sodium thiosulfate using a starch indicator.
3
5. Apparatus
5.1 The detinning cell consists essentially of two cathodes of carbon rod, the sample that serves as an anode, and a beaker of
dilute hydrochloric acid electrolyte. The carbon rods (6 by 0.25 in. or 152 by 6.35 mm, encased in porous porcelain thimbles) are
suspended from a suitable frame about 1 in. (25 mm) apart. A small glass-enclosed magnet is attached to the frame in such a
manner that it will hold the sample suspended midway between the two cathodes. A movable platform permits the beaker of
electrolyte to be brought up around the assembly so that the sample will be completely immer
...
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