Standard Practice for Operating Salt Spray (Fog) Apparatus

SIGNIFICANCE AND USE
This practice provides a controlled corrosive environment which has been utilized to produce relative corrosion resistance information for specimens of metals and coated metals exposed in a given test chamber.  
Prediction of performance in natural environments has seldom been correlated with salt spray results when used as stand alone data.
3.2.1 Correlation and extrapolation of corrosion performance based on exposure to the test environment provided by this practice are not always predictable.
3.2.2 Correlation and extrapolation should be considered only in cases where appropriate corroborating long-term atmospheric exposures have been conducted.
The reproducibility of results in the salt spray exposure is highly dependent on the type of specimens tested and the evaluation criteria selected, as well as the control of the operating variables. In any testing program, sufficient replicates should be included to establish the variability of the results. Variability has been observed when similar specimens are tested in different fog chambers even though the testing conditions are nominally similar and within the ranges specified in this practice.
SCOPE
1.1 This practice covers the apparatus, procedure, and conditions required to create and maintain the salt spray (fog) test environment. Suitable apparatus which may be used is described in Appendix X1.
1.2 This practice does not prescribe the type of test specimen or exposure periods to be used for a specific product, nor the interpretation to be given to the results.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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 and health practices and determine the applicability of regulatory limitations prior to use.

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Historical
Publication Date
28-Feb-2007
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ASTM B117-07 - Standard Practice for Operating Salt Spray (Fog) Apparatus
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:B117–07
Standard Practice for
1
Operating Salt Spray (Fog) Apparatus
This standard is issued under the fixed designation B 117; 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 Department of Defense.
1. Scope 3. Significance and Use
1.1 This practice covers the apparatus, procedure, and 3.1 This practice provides a controlled corrosive environ-
conditions required to create and maintain the salt spray (fog) ment which has been utilized to produce relative corrosion
test environment. Suitable apparatus which may be used is resistance information for specimens of metals and coated
described in Appendix X1. metals exposed in a given test chamber.
1.2 This practice does not prescribe the type of test speci- 3.2 Prediction of performance in natural environments has
men or exposure periods to be used for a specific product, nor seldom been correlated with salt spray results when used as
the interpretation to be given to the results. stand alone data.
1.3 3.2.1 Correlation and extrapolation of corrosion perfor-
1.4 This standard does not purport to address all of the mance based on exposure to the test environment provided by
safety concerns, if any, associated with its use. It is the this practice are not always predictable.
responsibility of the user of this standard to establish appro- 3.2.2 Correlation and extrapolation should be considered
priate safety and health practices and determine the applica- only in cases where appropriate corroborating long-term atmo-
bility of regulatory limitations prior to use. spheric exposures have been conducted.
3.3 The reproducibility of results in the salt spray exposure
2. Referenced Documents
is highly dependent on the type of specimens tested and the
2
2.1 ASTM Standards:
evaluation criteria selected, as well as the control of the
B 368 Test Method for Copper-Accelerated Acetic Acid- operating variables. In any testing program, sufficient repli-
Salt Spray (Fog) Testing (CASS Test)
cates should be included to establish the variability of the
D 609 Practice for Preparation of Cold-Rolled Steel Panels
results. Variability has been observed when similar specimens
for Testing Paint, Varnish, Conversion Coatings, and are tested in different fog chambers even though the testing
Related Coating Products
conditions are nominally similar and within the ranges speci-
D 1193 Specification for Reagent Water fied in this practice.
D 1654 Test Method for Evaluation of Painted or Coated
4. Apparatus
Specimens Subjected to Corrosive Environments
E70 Test Method for pH of Aqueous Solutions With the 4.1 The apparatus required for salt spray (fog) exposure
Glass Electrode consists of a fog chamber, a salt solution reservoir, a supply of
E 691 Practice for Conducting an Interlaboratory Study to suitably conditioned compressed air, one or more atomizing
Determine the Precision of a Test Method nozzles, specimen supports, provision for heating the chamber,
G85 Practice for Modified Salt Spray (Fog) Testing and necessary means of control. The size and detailed con-
struction of the apparatus are optional, provided the conditions
obtained meet the requirements of this practice.
1
This practice is under the jurisdiction of ASTM Committee G01 on Corrosion
4.2 Drops of solution which accumulate on the ceiling or
of Metals and is the direct responsibility of Subcommittee G01.05 on Laboratory
cover of the chamber shall not be permitted to fall on the
Corrosion Tests.
specimens being exposed.
Current edition approved March 1, 2007. Published March 2007. Originally
approved in 1939. Last previous edition approved in 2003 as B 117–03.
4.3 Drops of solution which fall from the specimens shall
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
not be returned to the solution reservoir for respraying.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.4 Material of construction shall be such that it will not
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. affect the corrosiveness of the fog.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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B117–07
4.5 AllwaterusedforthispracticeshallconformtoTypeIV 7.1.4 Salt solution from one specimen shall not drip on any
water in Specification D 1193 (except that for this practice other specimen.
limits for chlorides and sodium may be ignored).This does not
NOTE 2—Suitable
...

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