Salt Spray Test Chamber Standard ASTM B368 pdf download

It is a cyclic corrosion test in which sodium chloride and ammonium sulphate solution are used. This solution is used because it is more dilute than traditional salt fog. This test is also known as the Cass test and it is most commonly conducted for evaluating steel paints and for checking the corrosion resistance of different products. Moreover, testing chromium plating on zinc can also be tested by following this test. This test is specially developed for testing the decorative coatings of nickel, copper and chromium. It is used in manufacturing, research, and for simulated service evaluations.

Salt Solution

Prepare a salt solution with a salt solution made up of standard ASTM B117 five parts and 95% of water. Add 1g copper chloride dihydrate in /4 litres of the salt solution in Salt spray chamber.

pH range

3.1 to 3.3

Temperature of the test

49+-1 degree

Background of the test

ASTM B368 is used for evaluating the corrosion resistance of various alloys. It can be used for testing chromium plating on steel and zinc. 

Sample Preparation

Coat the cut edges of the samples to prevent edge corrosion. When the test cabinet is ready, clean the metallic-coated samples with an appropriate cleaning agent. If the samples are organic and non-metallic then they do not need to be cleaned. 

Time of the test and inspections

The time of the test ranges from different hours depending on the sample to be tested. The general exposure length of the test is 6, 12, 24, 48, 96, 192, 240, 504, and 720 hours.