ASTM G5-94(1999)

Standard Reference Test Method for Making Potentiostatic and Potentiodynamic Anodic Polarization Measurements

SCOPE
1.1 This test method describes an experimental procedure for checking experimental technique and instrumentation. If followed, this test method will provide repeatable potentiostatic and potentiodynamic anodic polarization measurements that will reproduce data determined by others at other times and in other laboratories provided all laboratories are testing reference samples from the same lot of Type 430 stainless steel.  
1.2 Values stated in SI units are to be regarded as the standard. Inch-pound units given in parentheses are for information only.  
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.

General Information

• Status: Historical
• Publication Date: 09-Aug-1999
• Technical Committee: G01 - Corrosion of Metals
• Drafting Committee: G01.11 - Electrochemical Measurements in Corrosion Testing

Relations

• Replaced By: ASTM G5-94(1999)e1 - Standard Reference Test Method for Making Potentiostatic and Potentiodynamic Anodic Polarization Measurements
• Effective Date: 15-Mar-1994

Standards Content (Sample)

Designation:G5–94 (Reapproved 1999)
Standard Reference Test Method for
Making Potentiostatic and Potentiodynamic Anodic
1
Polarization Measurements
This standard is issued under the fixed designation G 5; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope available for those who wish to check their own test procedure
4
and equipment.
1.1 This test method describes an experimental procedure
3.3 Standard potentiostatic and potentiodynamic polariza-
for checking experimental technique and instrumentation. If
tion plots are supplied with the purchase of the reference
followed, this test method will provide repeatable potentio-
material. These reference data are based on the results from
static and potentiodynamic anodic polarization measurements
different laboratories that followed the standard procedure,
that will reproduce data determined by others at other times
using that material in 1.0 N H SO . Maximum and minimum
2 4
and in other laboratories provided all laboratories are testing
current values are shown at each potential to indicate the
reference samples from the same lot of Type 430 stainless steel.
acceptable range of values.
1.2 Values stated in SI units are to be regarded as the
3.4 This test method may not be appropriate for polarization
standard. Inch-pound units given in parentheses are for infor-
testing of all materials or in all environments.
mation only.
3.5 This test method is intended for use in evaluating the
1.3 This standard does not purport to address all of the
accuracy of a given electrochemical test apparatus, not for use
safety concerns, if any, associated with its use. It is the
in evaluating materials performance. Therefore, the use of the
responsibility of the user of this standard to establish appro-
plots in Figs. 1 and 2 or Appendix X2 is not recommended to
priate safety and health practices and determine the applica-
evaluate alloys other than Type 430, or lots of Type 430 other
bility of regulatory limitations prior to use.
than those available through ASTM. The use of the data in this
2. Referenced Documents test method in this manner is beyond the scope and intended
use of this test method. Users of this test method are advised to
2.1 ASTM Standards:
evaluate test results relative to the scatter bands corresponding
E 1338 Guide for the Identification of Metals and Alloys in
2
to the particular lot of Type 430 stainless steel that was tested.
Computerized Material Property Databases
G 3 Practice for Conventions Applicable to Electrochemical
4. Apparatus
3
Measurements in Corrosion Testing
4.1 The test cell should be constructed to allow the follow-
G 107 Guide for Formats for Collection and Compilation of
ing items to be inserted into the solution chamber: the test
Corrosion Data for Metals for Computerized Database
3
electrode, two auxiliary electrodes, a Luggin capillary with
Input
salt-bridge connection to the reference electrode, inlet and
3. Significance and Use
outlet for an inert gas, and a thermometer. The test cell shall be
constructed of materials that will not corrode, deteriorate, or
3.1 The availability of a standard procedure, standard ma-
otherwise contaminate the test solution.
terial, and a standard plot should make it easy for an investi-
gator to check his techniques. This should lead to polarization
NOTE 1—Borosilicate glass and TFE-fluorocarbon have been found
curves in the literature which can be compared with confi-
suitable.
dence.
5
4.1.1 A suitable cell is shown in Fig. 3 (1). A 1-L,
3.2 Samples of a standard ferritic Type 430 stainless steel
roundbottom flask has been modified by the addition of various
(UNS S43000) used in obtaining standard reference plot are
necks to permit the introduction of electrodes, gas inlet and
outlet tubes, and a thermometer. The Luggin probe-salt bridge
separates the bulk solution from the saturated calomel refer-
ence electrode, and the probe tip can be easily adjusted to bring
1
This test method is under the jurisdiction of ASTM Committee G-1 on
Corrosion of Metals and is the direct responsibility of G01.11 on Electrochemical
Measurements in Corrosion Testing.
4
Current edition approved March 15, 1994. Published May 1994. Originally
These standard samples are available from ASTM Headquarters. Generally, one
published as G 5 – 69. Last previous edition G5–87.
sample can be repolished and reused for many runs. This procedure is suggested to
2
Annual Book of ASTM Standards, Vol 14.01.
conserve the available material. Order PCN 12-700050-00.
3
5
Annual Book of ASTM Standards, Vol 03.02.
The boldface numbers in parentheses refer to the list of references at the end of
this test method.
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