Fog testing

MSTM B117, Std Test Method of Salt Spray (Fog) Testings American Society for Testing and Materials, Philadelphia, Pa., 1990. 

Standard method for evaluation of painted or coated specimens subjected to corrosive environments Standard test method of salt spray (FOG) testing... 

The most common of the spray tests is the salt-spray or salt-fog test which was developed originally by Capp in 1914 for studying the protective values of metallic coatings on steel under conditions that he hoped would simulate exposure to a sea-coast atmosphere. Since then the test has been used for a number of purposes, for many of which it is not well suited Although there is no standard size or shape of salt-spray box certain other features of the test have been standardised in ASTM B117 1990. Various... 

Practice for detecting susceptibility to intergranular attack in ferritic stainless steels Method of salt spray (fog) testing Method for mercurous nitrate test for copper and copper alloys... 

Method for copper-accelerated acetic acid-salt spray (fog) testing (CASS test)... 

For the salt fog test, ASTM-B117, panels were placed on a rack in a salt fog spray for 500 or 1000 hours at a... 

Metallic corrosion is an electrochemical process associated with the flow of current between surface sites having a difference in electrochemical potential. The assessment and evaluation of organic coatings to prevent metal corrosion has traditionally been accomplished through salt fog testing (ASTM B-117) and long term exposure tests in particular service environments. Electrochemical techniques have often been considered (, but are not routinely employed in practice. 

Salt Spray (fog) test (ASTM B 117) with a testing period of 3200 hours. 

In all the paint systems tested in the atmosphere, the presence of the chloride contaminant at its highest concentration, causes the appearance of small blisters. Such blisters may in time burst due to the oxide built-up inside them, as was seen in the case in the CR system ("Table III.") In the P system ("Table III."), the blistering seen with the third level of chlorides continues after two years outdoor exposure, without rust coming through the coating. This same effect is also seen in salt fog test panels, but it does not appear in those test specimens subjected to accelerated weathering tests. 

Panels of high strength aluminum alloy (7075-T6) were used in this study. The panels were approximately 10 x 3 x 0.032 inch (25 x 7.5 x 0.08 cm) in size. The test environments for coating evaluation were (1) a 5% NaCl spray (fog) chamber according to ASTM Standard Method of Salt Spray (Fog) Testing (B117-73), and (2) a modified 5% NaCl/S02 spray (fog) chamber with SO gas introduced periodically - ASTM Standard Practice for Modified Salt Spray (Fog) Testing (G85-84(A4)). In the latter case, a constant spray of 5% NaCl was maintained in the chamber and SO2 was introduced for one hour four tines a day (every 6 hours)( ). Coated test panels were examined for corrosion after one- and two- eek exposure periods. 

Salt Spray (Fog) Test 107 is briefly described in Vol 4, pp D1096-R 8 D1097-L. 

Salt Spray Fog Test with Sodium Chloride Solutions. The sample is sprayed continuously with a 5 % aqueous sodium chloride solution. There are three variations of the test the salt spray fog test, the acetic add salt spray test, and the copper chloride-acetic acid salt spray test. 

Annual Book of ASTM Standards, Practice for Operating Salt Spray (Fog) Testing Apparatus, B117-95, ASTM, Philadelphia, PA, 1995. 

Nevertheless, there were reliable reports of corrosion occurring with molybdenum disulphide in films and in greases. Several such reports arose from the US Army , originating with a salt fog test of a missile launcher in which all parts coated with solid film lubricant rusted badly. Subsequent reports described galvanic corrosion of various metals with molybdenum disulphide in moist atmospheres. 

Salt Spray Fog Test with Sodium Chloride Solutions... 

Fig. 9 Results of fogging tests in micrograms (sampled on 450 cm over 14 days)...

Metallic Mat Testing Combustion, Noise, Pressure Drop, Creep, and Salt Fog Tests.509... 

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