Standard Practice for Operating Salt Spray (Fog) Apparatus

SCOPE
1.1 This practice describes 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 standard. The inch-pound units in parentheses are provided for information and may be approximate.  
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
09-Apr-1997
Current Stage
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ASTM B117-97 - 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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: B 117 – 97
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 (e) 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 describes 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 The values stated in SI units are to be regarded as 3.2.1 Correlation and extrapolation of corrosion perfor-
standard. The inch-pound units in parentheses are provided for mance based on exposure to the test environment provided by
information and may be approximate. this practice are not always predictable.
1.4 This standard does not purport to address all of the 3.2.2 Correlation and extrapolation should be considered
safety concerns, if any, associated with its use. It is the only in cases where appropriate corroborating long-term atmo-
responsibility of the user of this standard to establish appro- spheric exposures have been conducted.
priate safety and health practices and determine the applica- 3.3 The reproducibility of results in the salt spray exposure
bility of regulatory limitations prior to use. is highly dependent on the type of specimens tested and the
evaluation criteria selected, as well as the control of the
2. Referenced Documents
operating variables. In any testing program, sufficient repli-
2.1 ASTM Standards:
cates should be included to establish the variability of the
B 368 Method for Copper-Accelerated Acetic Acid-Salt results. Variability has been observed when similar specimens
2
Spray (Fog) Testing (CASS Test)
are tested in different fog chambers even though the testing
D 609 Practice for Preparation of Cold-Rolled Steel Panels conditions are nominally similar and within the ranges speci-
for Testing Paint, Varnish, Conversion Coatings, and
fied in this practice.
3
Related Coating Products
4
4. Apparatus
D 1193 Specification for Reagent Water
D 1654 Test Method for Evaluation of Painted or Coated 4.1 The apparatus required for salt spray (fog) exposure
3
Specimens Subjected to Corrosive Environments consists of a fog chamber, a salt solution reservoir, a supply of
E 70 Test Method for pH of Aqueous Solutions with the suitably conditioned compressed air, one or more atomizing
5
Glass Electrode nozzles, specimen supports, provision for heating the chamber,
E 691 Practice for Conducting an Interlaboratory Study to and necessary means of control. The size and detailed con-
6
Determine the Precision of a Test Method struction of the apparatus are optional, provided the conditions
7
G 85 Practice for Modified Salt Spray (Fog) Testing obtained meet the requirements of this practice.
4.2 Drops of solution which accumulate on the ceiling or
cover of the chamber shall not be permitted to fall on the
1 specimens being exposed.
This practice is under the jurisdiction of ASTM Committee G01 on Corrosion
4.3 Drops of solution which fall from the specimens shall
of Metals and is the direct responsibility of Subcommittee G01.05 on Laboratory
Corrosion Tests.
not be returned to the solution reservoir for respraying.
Current edition approved Apr. 10, 1997. Published November 1997. Originally
4.4 Material of construction shall be such that it will not
published as B 117 – 39 T. Last previous edition B 117 – 95.
2
affect the corrosiveness of the fog.
Annual Book of ASTM Standards, Vol 02.05.
3
Annual Book of ASTM Standards, Vol 06.01.
4.5 All water used for this practice shall conform to Type IV
4
Annual Book of ASTM Standards, Vol 11.01.
water in Specification D 1193 (except that for this practice
5
Annual Book of ASTM Standards, Vol 15.05.
6 limits for chlorides and sodium may be ignored). This does not
Annual Book of ASTM Standards, Vol 14.02.
7
Annual Book of ASTM Standards, Vol 03.02.
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