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Some Characteristics of ASTM B117 -
Standard Practice for Operating Salt Spray (Fog) Apparatus:
- Considered most useful for measuring relative corrosion resistance of closely related
materials (comparative test).
- Widely used for process qualification and quality acceptance.
- Applicable to metals/alloys and their coatings (there are some important exceptions -
see ASTM B117 standard).
- Provides a controlled corrosive environment representing accelerated marine type
atmospheric conditions (acceleration from prevailing test temperature and/or degree of
wetness).
- Reproducibility of results can be affected by specimen type, details surrounding
specimen surface condition, evaluation criteria, operating variables and the type of test
chamber.
- Correlation of test results to in-service (field) performance only to be considered if
supported by results from long term in-service atmospheric exposures.
- Salt spray resistance results tend to differ from resistance to other media -
alternative tests are designed for other media.
- Does not define test specimens nor exposure time.
- Does not address meaning (interpretation) of test results.
References/Literature:
ASTM B117: Standard Practice for Operating Salt Spray (Fog) Apparatus, ASTM
International (1997 Edition).
Links:
History of the salt spray test - History Module in
corrosion-club.com
ASTM International
www.astm.org
Technical Notes from GalvInfo Center (see Note No.15)
http://www.galvinfo.com/GalvInfoNotes.htm
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