ASTM G92-20

Standard Practice for Characterization of Atmospheric Test Sites

SIGNIFICANCE AND USE
4.1 This practice gives suggested procedures for characterization of atmospheric test sites. It can be useful to researchers, manufacturers, engineering firms, architects, and construction contractors to provide corrosion and environmental data, materials selection information, and a materials storage practice.  
4.2 This practice does not give specific parameters for classifying the type of test site.
SCOPE
1.1 This practice covers procedures for the characterization of atmospheric test sites. Continuous characterization can provide corrosion data, environmental data, or both which will signal changes in corrosivity of the atmospheric environment. This practice can also provide guidance for classification of future test sites.  
1.2 Two methods are defined in this practice for the characterization of atmospheric test sites. The methods are identified as characterization Methods A and B. The preferred characterization technique would require using both Method A and B for concurrent data collection.  
1.2.1 Method A is to be used when atmospheric corrosion is monitored on a continuing basis at a test site using specified materials and exposure configurations.  
1.2.2 Method B is specified when atmospheric factors are monitored on a continuing basis.  
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 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

• Status: Published
• Publication Date: 31-Oct-2020
• ICS: 19.040 - Environmental testing
• Technical Committee: G01 - Corrosion of Metals
• Drafting Committee: G01.04 - Corrosion of Metals in Natural Atmospheric and Aqueous Environments

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:G92 −20
Standard Practice for
1
Characterization of Atmospheric Test Sites
ThisstandardisissuedunderthefixeddesignationG92;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope B6 Specification for Zinc
G1 Practice for Preparing, Cleaning, and Evaluating Corro-
1.1 This practice covers procedures for the characterization
sion Test Specimens
of atmospheric test sites. Continuous characterization can
G50 Practice for Conducting Atmospheric Corrosion Tests
provide corrosion data, environmental data, or both which will
on Metals
signal changes in corrosivity of the atmospheric environment.
G84 Practice for Measurement of Time-of-Wetness on Sur-
This practice can also provide guidance for classification of
faces Exposed to Wetting Conditions as in Atmospheric
future test sites.
Corrosion Testing
1.2 Two methods are defined in this practice for the char-
G91 Practice for Monitoring Atmospheric SO Deposition
2
acterization of atmospheric test sites. The methods are identi-
Rate for Atmospheric Corrosivity Evaluation
fied as characterization Methods A and B. The preferred
characterization technique would require using both MethodA
3. Summary of Methods
and B for concurrent data collection.
3.1 Characterization Method A is to be used when atmo-
1.2.1 MethodAis to be used when atmospheric corrosion is
spheric corrosion data are to be obtained.
monitored on a continuing basis at a test site using specified
3.1.1 Corrosion tests to measure the corrosivity of the test
materials and exposure configurations.
site should follow the procedure established by Practice G50.
1.2.2 Method B is specified when atmospheric factors are
Additional special instructions are identified in this procedure
monitored on a continuing basis.
relating to types of materials for corrosion characterization
1.3 The values stated in SI units are to be regarded as
tests, time of test exposure, positioning of test specimens,
standard. No other units of measurement are included in this
removal of test specimens and proper identification, cleaning
standard.
practices, and reporting of data.
1.4 This standard does not purport to address all of the
3.2 Characterization Method B is to be used when atmo-
safety concerns, if any, associated with its use. It is the
spheric climatological factors influencing the corrosion of
responsibility of the user of this standard to establish appro-
metals are to be monitored.
priate safety, health, and environmental practices and deter-
3.2.1 Several atmospheric factors which have been identi-
mine the applicability of regulatory limitations prior to use.
fied as having significant bearing on the corrosion of metals
1.5 This international standard was developed in accor-
include, but are not limited to, sulfur dioxide, chlorides,
dance with internationally recognized principles on standard-
temperature, humidity, precipitation, time of wetness, and
ization established in the Decision on Principles for the
atmospheric particulate matter.
Development of International Standards, Guides and Recom-
3.3 The preferred technique utilizes both Methods A and B
mendations issued by the World Trade Organization Technical
for concurrent data to be collected.
Barriers to Trade (TBT) Committee.
3.3.1 Should either Method A or B be singled out as the
2. Referenced Documents
primary technique to be used on a continuing basis, both
2
should be used at some point in time to establish a data base.
2.1 ASTM Standards:
A36/A36M Specification for Carbon Structural Steel The availability of computerized weather stations greatly
facilitates the collection of reliable atmospheric data.
1
This practice is under the jurisdiction of ASTM Committee G01 on Corrosion
of Metals and is the direct responsibility of Subcommittee G01.04 on Corrosion of
4. Significance and Use
Metals in Natural Atmospheric and Aqueous Environments.
4.1 This practice gives suggested procedures for character-
CurrenteditionapprovedNov.1,2020.PublishedNovember2020.Lastprevious
edition approved in 2015 as G92–86(2015). DOI: 10.1520/G0092-20.
ization of atmospheric test sites. It can be useful to researchers,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
manufacturers, engineering firms, architects, and construction
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
contractors to provide corrosion and environmental data, ma-
Standards volume information, refer to the standard’s
...

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: G92 − 86 (Reapproved 2015) G92 − 20
Standard Practice for
1
Characterization of Atmospheric Test Sites
This standard is issued under the fixed designation G92; 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
1.1 This practice gives suggested covers procedures for the characterization of atmospheric test sites. Continuous characterization
can provide corrosion data, environmental data, or both which will signal changes in corrosivity of the atmospheric environment.
This practice can also provide guidance for classification of future test sites.
1.2 Two methods are defined in this practice for the characterization of atmospheric test sites. The methods are identified as
characterization Methods A and B. The preferred characterization technique would require using both Method A and B for
concurrent data collection.
1.2.1 Method A is to be used when atmospheric corrosion is monitored on a continuing basis at a test site using specified materials
and exposure configurations.
1.2.2 Method B is specified when atmospheric factors are monitored on a continuing basis.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.5 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.
2. Referenced Documents
2
2.1 ASTM Standards:
A36/A36M Specification for Carbon Structural Steel
B6 Specification for Zinc
G1 Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens
G50 Practice for Conducting Atmospheric Corrosion Tests on Metals
G84 Practice for Measurement of Time-of-Wetness on Surfaces Exposed to Wetting Conditions as in Atmospheric Corrosion
Testing
G91 Practice for Monitoring Atmospheric SO Deposition Rate for Atmospheric Corrosivity Evaluation
2
1
This practice is under the jurisdiction of ASTM Committee G01 on Corrosion of Metals and is the direct responsibility of Subcommittee G01.04 on Atmospheric
CorrosionCorrosion of Metals in Natural Atmospheric and Aqueous Environments.
Current edition approved Nov. 1, 2015Nov. 1, 2020. Published December 2015November 2020. Last previous edition approved in 20102015 as
G92–86(2010).G92–86(2015). DOI: 10.1520/G0092-86R15. 10.1520/G0092-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
G92 − 20
3. Summary of Methods
3.1 Characterization Method A is to be used when atmospheric corrosion data are to be obtained.
3.1.1 Corrosion tests to measure the corrosivity of the test site should follow the procedure established by Practice G50. Additional
special instructions are identified in this procedure relating to types of materials for corrosion characterization tests, time of test
exposure, positioning of test specimens, removal of test specimens and proper identification, cleaning practices, and reporting of
data.
3.2 Characterization Method B is to be used when atmospheric climatological factors influencing the corrosion of metals are to
be monitored.
3.2.1 Several atmospheric factors which have been identified as having significant bearing on the corrosion of metals include, but
are not limited to, sulfur dioxide, chlorides, temperature, humidity, precipitation, time of wetness, and atmospheric particulate
matter.
3.3 The preferred technique utilizes both Methods A and B for concurrent data to be collected.
3.3.1 Should either Method A or B be singled out a
...