test is performed in accordance with the specifications found in the ASTM B 368 - Standard method for Copper
Accelerated Acetic Acid Salt Spray (Fog) Testing (Cass). A standard ASTM B117 salt
fog cabinet is employed. A 5% sodium chloride solution is used, with the
addition of 1 gram of copper chloride dihydrate per each 3.8 liters of salt
solution. The solution is then adjusted to a ph of 3.1-3.3 by adding acetic
acid, and the temperature is adjusted to the same range as for the neutral salt
spray (ASTM B117), and the acetic acid salt spray (ASTM G 85).
The CASS Test is widely used
for research and development, simulated service evaluation, manufacturing
control, and specification acceptance. It was developed specifically to test
nickel/chromium and copper/nickel/chromium electrodeposited coatings. And it is
also used to determine the corrosion resistance of various aluminum alloys.