Copper Accelerated Acetic Acid Salt Spray (Fog) Testing
Can be used to test the relative resistance to corrosion of anodized aluminium and decorative copper/nickel/chromium or nickel/chromium coatings on steel and zinc based die castings, when exposed to a copper accelerated acetic acid salt spray climate at an elevated temperature.
Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of acidified (pH 3.1to 3.3) salt water solution, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour, in a chamber temperature of +49C. This climate is maintained under constant steady state conditions. The test duration is variable.
This test is also referred to as a CASS test.
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Operating Salt Spray (Fog) Apparatus
Can be used to test the relative resistance to corrosion of coated and uncoated metallic specimens, when exposed to a salt spray climate at an elevated temperature.
Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of neutral (pH 6.5 to 7.2) salt water solution, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour, in a chamber temperature of +35C. This climate is maintained under constant steady state conditions. The test duration is variable.
This test is also referred to as a Neutral Salt Spray or NSS test.
For further information on this standard visit; www.astmb117.com
For further information on ASTM standards visit; www.astm.com
Testing water resistance of coatings using water fog apparatus
Can be used to test the water resistance of coatings by exposing coated specimens to water fog at an elevated temperature, using apparatus similar to that used for salt spray testing to ASTM B117.
Test specimens are placed in an enclosed chamber that meets the apparatus requirements of ASTM B117. Here they are exposed to a continuous indirect spray water, which falls-out on to the specimens at a rate of 1.5 to 3.0ml/80cm²/hour, in a chamber temperature of +38C. This climate is maintained under constant steady state conditions. The test duration is variable.
For further information on ASTM standards visit; www.astm.com
Testing Water Resistance in 100% RH
ASTM D2247 – Can be used to test the water resistance of coatings by exposing coated specimens to a high relative humidity at an elevated constant temperature, so that condensation forms upon them.
Test specimens are placed in an enclosed chamber, in which a climate is created that comprises of a heated, saturated mixture of air and water vapour, at a temperature of +38C and a relative humidity of 100%RH. This climate is maintained under constant steady state conditions. The test duration is variable.
For further information on ASTM standards visit; www.astm.com
