**Appendix B**
**(Informational Appendix)**
**Supplementary Method for Evaluating Corrosion in a Salt Spray Test Chamber Using a Zinc Reference Sample**
**B.1 Reference Sample**
As specified in this standard, to ensure the accuracy of corrosion testing in the salt spray chamber, 4 or 6 reference samples are used. Each sample must have a mass fraction of less than 0.1%. These samples are typically made of pure zinc or a zinc alloy with minimal impurities.
The dimensions of each reference sample should be 50 mm × 100 mm × 1 mm. Before testing, the samples are carefully cleaned using a hydrocarbon solvent to remove any dirt, oils, or foreign substances that might interfere with the corrosion measurement. After thorough drying, the samples are weighed with a precision of ±1 mg to ensure accurate baseline measurements.
To prevent unintended corrosion on the back side, especially if the sample is coated with an adsorptive material like a plastic film, the reverse side can be protected by removing the coating or covering it with a non-reactive material.
**B.2 Placement of the Reference Sample**
Place the 4 reference specimens in the four corners of the salt spray test chamber. If 6 samples are used, they should be distributed across six different positions, including the four corners. The unprotected side of the samples should be placed upward and positioned at an angle of 20° ± 5° relative to the vertical.
The reference sample holders must be constructed from or coated with inert materials such as plastic to avoid any chemical interactions. The height of the reference samples should match the height of the test samples being evaluated to maintain consistent exposure conditions.
For the Neutral Salt Spray (NSS) test, the recommended duration is 48 hours. For the Acetic Acid Salt Spray (AASS) and Copper Accelerated Acetic Acid Salt Spray (CASS) tests, the recommended time is 24 hours. This ensures reliable and repeatable results when assessing the corrosivity of the test chamber.
By following these procedures, laboratories can effectively monitor and validate the performance of their salt spray test chambers, ensuring that the test conditions remain consistent and representative of real-world corrosion environments.
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