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ASTM B826-03

(Test Method)

Standard Test Method for Monitoring Atmospheric Corrosion Tests by Electrical Resistance Probes

Standard Test Method for Monitoring Atmospheric Corrosion Tests by Electrical Resistance Probes

SCOPE
1.1 This test method provides a means for monitoring corrosivity of environmental tests that involve exposure to corrosive gases.
1.2 This test method uses a resistance monitor (RM) probe fabricated from a chosen metal conductor, with one conductor segment uncovered to permit exposure of the chosen metal conductor to the corrosive gas mixture and the second conductor segment covered to protect the metal conductor of this segment from direct attack by the corrosive gas mixture. The covered conductor segment provides a reference for evaluating changes in the uncovered segment. The ratio of the resistance of the exposed segment to that of the covered segment provides a measure of the amount of metal conductor that has reacted with the corrosive gas test environment to form poorly conducting corrosion product, thus providing a measure of test corrosivity.
1.3 Resistance monitoring is applicable to a broad range of test conditions by selection of the appropriate metal conductor and initial metal thickness.
1.4 This method is similar in intent to Test Methods B 808.
1.5 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 Material Safety Data Sheet for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
09-Jun-2003
ICS
77.060 - Corrosion of metals
Technical Committee
B02 - Nonferrous Metals and Alloys
Drafting Committee
B02.11 - Electrical Contact Test Methods
Current Stage
Ref Project

Relations

Replaces
ASTM B826-97 - Standard Test Method for Monitoring Atmospheric Corrosion Tests by Electrical Resistance Probes
Effective Date
10-Jun-2003
Replaced By
ASTM B826-09 - Standard Test Method for Monitoring Atmospheric Corrosion Tests by Electrical Resistance Probes
Effective Date
01-Oct-2009
Referred By
ASTM B845-97(2018) - Standard Guide for Mixed Flowing Gas (MFG) Tests for Electrical Contacts
Effective Date
10-Jun-2003
Referred By
ASTM B827-05(2020) - Standard Practice for Conducting Mixed Flowing Gas (MFG) Environmental Tests
Effective Date
10-Jun-2003

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ASTM B826-03 - Standard Test Method for Monitoring Atmospheric Corrosion Tests by Electrical Resistance ProbesASTM B826-03 - Standard Test Method for Monitoring Atmospheric Corrosion Tests by Electrical Resistance Probes
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ASTM B826-03 - Standard Test Method for Monitoring Atmospheric Corrosion Tests by Electrical Resistance Probes
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information.
Designation:B826–03
Standard Test Method for
Monitoring Atmospheric Corrosion Tests by Electrical
1
Resistance Probes
This standard is issued under the fixed designation B826; 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 B808 Test Method for Monitoring of Atmospheric Corro-
2
sion Chambers by Quartz Crystal Microbalances
1.1 This test method provides a means for monitoring
B810 Test Method for Calibration of Atmospheric Corro-
corrosivity of environmental tests that involve exposure to
sion Test Chambers by Change in Mass of Copper Cou-
corrosive gases.
2
pons
1.2 This test method uses a resistance monitor (RM) probe
B827 Practice for Conducting Mixed Flowing Gas (MFG)
fabricated from a chosen metal conductor, with one conductor
3
Environmental Tests
segment uncovered to permit exposure of the chosen metal
G96 Guide for Online Monitoring of Corrosion in Plant
conductor to the corrosive gas mixture and the second conduc-
Equipment (Electrical and Electrochemical Methods)
tor segment covered to protect the metal conductor of this
segment from direct attack by the corrosive gas mixture. The
3. Summary of Test Method
covered conductor segment provides a reference for evaluating
3.1 The corrosivity of an atmospheric corrosion test such as
changes in the uncovered segment. The ratio of the resistance
a mixed flowing gas (MFG) type test is measured by monitor-
oftheexposedsegmenttothatofthecoveredsegmentprovides
ing the loss in electrical conductivity of a metal element whose
a measure of the amount of metal conductor that has reacted
surface corrodes to form poorly conducting corrosion product.
with the corrosive gas test environment to form poorly con-
Thiscorrosionproductconsumesmetalfromaconductionpath
ducting corrosion product, thus providing a measure of test
causing an increase in electrical resistance. The resistance of
corrosivity.
the degraded conduction path is compared with a similar path
1.3 Resistance monitoring is applicable to a broad range of
whose surface is covered to prevent corrosion. This compari-
test conditions by selection of the appropriate metal conductor
sonresistancealsoprovidesatemperaturecorrectionreference.
and initial metal thickness.
The ratio of the electrical resistance of the path exposed to the
1.4 This method is similar in intent to Test Methods B808.
corrosive gases to that of the covered path is monitored during
1.5 This standard does not purport to address all of the
thetestandcomparedtoanexpectedratio-versus-timecurveto
safety concerns, if any, associated with its use. It is the
establish the relationship of the test corrosivity to expected test
responsibility of the user of this standard to become familiar
corrosivity. Alternatively, the ratio-versus-time curve for a
with all hazards including those identified in the appropriate
given atmosphere can be compared with the behavior of other
Material Safety Data Sheet for this product/material as pro-
corrosiveatmospherestoevaluatetherelativecorrosivityofthe
vided by the manufacturer, to establish appropriate safety and
various atmospheres.
health practices, and determine the applicability of regulatory
limitations prior to use.
4. Significance and Use
4.1 Corrosivity monitoring of test environments provides a
2. Referenced Documents
2
means to monitor an integrated value of test corrosivity which
2.1 ASTM Standards:
cannot be evaluated from test parameters themselves, such as
temperature, humidity, and gas concentration. As such the
1
This test method is under the jurisdiction of ASTM Committee B02 on
monitor value can be used for specification purposes such as
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.11 on Electrical Contact Test Methods.
Current edition approved June 10, 2003. Published July 2003. Originally
approved in 1997. Last previous edition approved in 1997 as B826 - 97. DOI:
10.1520/B0826-03.
2 3
Annual Book of ASTM Standards, Vol 03.04. Annual Book of ASTM Standards, Vol 03.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
B826–03
test validation. Electrical resistance monitoring of conductors product, which grows out from the edges of the conductor
4,5,6,7
exposed to corrosive media is a well-established practice. paths, can contact adjacent paths; when such contacting cor-
4.2 The resistance method assumes uniform corrosion over
rosion films are formed from conducting corrosion products
the entire surface of the exposed metal
...

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Standard Test Method for Calibration of Atmospheric Corrosion Test Chambers by Change in Mass of Copper Coupons

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4.1 Electrical devices that contain electrical contacts generally contain some copper-based materials. Atmospheric corrosion of copper parts in such devices often occurs in service environments. A quantitative measure of the effect of a laboratory corrosion test on copper permits assessment of the severity of the test. In addition, corrosion tests may be defined in terms of their effect on copper; this test method provides a way of comparing one test against a standard defined elsewhere, or allows a comparison of the performance of a test over a period of time. Although this test method provides for a relatively simple check of a test, the user is advised that additional analysis of the test chamber ambient is generally required to reproduce test conditions.  
4.2 Atmospheric corrosion tests are used on a variety of materials besides copper. Care should be exercised in drawing conclusions about the effects on such materials of apparently equivalent tests if the composition of gases or experimental conditions are different. The primary use of this calibration test method is to assure correlation among nominally identical tests.
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1.1 This test method covers the calibration of atmospheric corrosion test chambers for electrical contacts that produce an adherent film of corrosion product on copper, such as a test comprised of a mixture of flowing gases that react with copper.  
1.2 This test method is not applicable to tests where corrosion products may be removed from a copper surface during the test by fluids.  
1.3 This test method is not applicable to tests where airborne solid or liquid material may be deposited on a copper surface during the test, as in a test which includes particulates suspended in the atmosphere.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 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.  
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4.1 Corrosion film growth with thicknesses varying from a monolayer of atoms up to 1 μm can readily be measured on a continuous, real-time, in-situ, basis with QCMs.  
4.2 The test results obtained for this test method are influenced by various factors, including geometrical effects, temperature, humidity, film thickness, film materials, electrode conditions, gases in the corrosion chamber, atmospheric pressure, and so forth. Calibration of coated crystals and instrumentation and reproducible crystal operating conditions are necessary for consistent results.
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1.1 This test method monitors the reactivity of a gaseous test environment in which metal surfaces (for example, electrical contacts, assembled printed wiring boards, and so forth) and other materials subject to pollutant gas attack undergo accelerated atmospheric corrosion testing. This test method is applicable to the growth of adherent corrosion films whose total corrosion film thickness ranges from a few atomic monolayers to approximately a micrometre.  
1.2 The test method provides a dynamic, continuous, in-situ, procedure for monitoring the corrosion rate in corrosion chambers; the uniformity of corrosion chambers; and the corrosion rate on different surfaces. Response time in the order of seconds is possible.  
1.3 With the proper samples, the quartz crystal microbalance (QCM) test method can also be used to monitor the weight loss from a surface as a result of the desorption of surface species (that is, reduction of an oxide in a reducing atmosphere). (Alternative names for QCM are quartz crystal oscillator, piezoelectric crystal oscillator, or thin-film evaporation monitor.)  
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Standard Test Method for Monitoring Atmospheric Corrosion Tests by Electrical Resistance Probes

SIGNIFICANCE AND USE
4.1 Corrosivity monitoring of test environments provides a means to monitor an integrated value of test corrosivity which cannot be evaluated from test parameters themselves, such as temperature, humidity, and gas concentration. As such the monitor value can be used for specification purposes such as test validation. Electrical resistance monitoring of conductors exposed to corrosive media is a well-established practice.3,4,5,6  
4.2 The resistance method assumes uniform corrosion over the entire surface of the exposed metal conductor segment. Local corrosion such as pitting, crevice, or grain boundary corrosion may provide invalid estimates of test corrosivity. Marked changes in slope of the curve of electrical resistance ratio versus time may indicate undesired processes which can be due to deficiencies in the test atmosphere or in the monitor itself.  
4.3 Because of limitations of the diffusion process within the corrosion product formed on the metal conductor segment of the RM probe when passivating corrosion films are formed, resistance monitoring may not be useful for test chamber monitoring purposes for very long test exposures. Chamber monitoring is dependent on detecting changes in the rate of corrosion of the RM as an indicator signal that specified gas concentrations must be reverified. However, low corrosion rates limit the absolute value of the rate of change of corrosion rate with change of test conditions; for parabolic film growth processes, the growth rate decreases with time limiting the sensitivity of the RM at extended test times.  
4.4 Since corrosion rate can be a complex function of test parameters in MFG tests with any given metal primarily responsive to a subset of the gases in the MFG environment, more than one type metal resistance probe is required in order to assist in maintenance of relative gas concentrations. For such test specifications, values of resistance ratios must be referred to ratios obtained under known test conditions a...
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1.1 This test method provides a means for monitoring corrosivity of environmental tests that involve exposure to corrosive gases.  
1.2 This test method uses a resistance monitor (RM) probe fabricated from a chosen metal conductor, with one conductor segment uncovered to permit exposure of the chosen metal conductor to the corrosive gas mixture and the second conductor segment covered to protect the metal conductor of this segment from direct attack by the corrosive gas mixture. The covered conductor segment provides a reference for evaluating changes in the uncovered segment. The ratio of the resistance of the exposed segment to that of the covered segment provides a measure of the amount of metal conductor that has reacted with the corrosive gas test environment to form poorly conducting corrosion product, thus providing a measure of test corrosivity.  
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SCOPE
1.1 This practice covers the apparatus and procedure to be used in conducting qualitative assessment tests in accordance with the requirements of material or product specifications by means of specimen exposure to condensed moisture containing sulfur dioxide.  
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5.1 This test method is designed to rank material couples, surface treatments, and lubricants by CFT and in their resistance to adhesive wear. Since adhesive wear is a complex phenomenon and stochastic in nature, it is essential to evaluate surfaces to confirm the presence of adhesion.  
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4.1 Nickel/chromium and copper/nickel/chromium electrodeposited coatings are widely used for decorative and protective applications. The Corrodkote test provides a method of controlling the quality of electroplated articles and is suitable for manufacturing control, as well as research and development.
SCOPE
1.1 This test method covers the Corrodkote2 method of evaluating the corrosion performance of copper/nickel/chromium and nickel/chromium coatings electrodeposited on steel, zinc alloys, aluminum alloys, plastics and other substrates.  
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