Atmospheric corrosion tests recording specimens ASTM

ASTM G33, Standard Practice for Recording Data from Atmospheric Corrosion Tests of Metallic-coated Steel Specimens, West Conshohoken, PA, 1988. 

ASTM 033 2004 Standard practice for recording data from atmospheric corrosion tests of metallic-coated steel specimens... 

ASTM G 33, Practice for Recording Data from Atmospheric Corrosion Tests of Metallic-Coated Steel Specimens G 50, Practice for Conducting Atmospheric Corrosion Tests on Metals G 84, Practice for Measurement of Time-of-Wetness on Surfaces Exposed to Wetting Conditions as in Atmospheric Corrosion Testing G 92, Practice for Characterization of Atmospheric Test Sites. 

There are several other aspects of atmospheric characterization which, if measured, can provide pertinent information related to the performance of materials. Probably the most important and universal is the determination of the TOW, described earlier. ASTM G 84, Practice for Measurement of Time-of-Wetness on Surfaces Exposed to Wetting Conditions as in Atmospheric Corrosion Testing, describes instrumentation and techniques for measuring TOW. This parameter can most easily (and adequately) be estimated from weather bureau records. It is generally accepted that metal atmospheric test specimens are wet when the temperature is above freezing and the relative humidity is above 80 %. There are indications that corrosion can occur under arctic conditions down to 0°F if... 

After removal at the specified exposure period, the specimens are evaluated. Visual examination of the specimens upon removal is usually performed, and a photographic record of appearance is valuable. ASTM G 33, Practice for Recording Data from Atmospheric Corrosion Tests of MetaUic-Coated Steel Specimens, can provide guidance for evaluation procedures. Before determination of mass loss, or for most other evaluation techniques, the specimens must be cleaned. Again, cleaning procedures are described in ASTM G 1 and A 380 for most materials of interest. ASTM G 1 also includes a procedure for determining when the corrosion products have been removed. After cleaning, specimens should be placed in a desiccator with fresh dessicant until ready for further evaluation. 

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