The copper-accelerated acetic acid salt spray test, also known as the CASS test in Japan, is a more rigorous corrosion testing method compared to the neutral salt spray test. It meets several national standards, including GB/T 2423.17-1993, GB/T 2423.18-2000, GB/T 10125-1997, GB/T 10587-2006, GB/T 1771-2007, GB/T 1765-1979, GB/T 12967.3-2008, and GB/T 10593.2-1990, as well as international standards such as IEC, MIL, DIN, and ASTM. This test is widely used for evaluating the corrosion resistance of coated materials under accelerated conditions.
The preparation of the acetic acid solution for the copper-accelerated salt spray test involves several key steps. First, an analytical-grade sodium chloride (NaCl) solution is prepared using distilled water that meets the specifications of GB 6682. The concentration of the NaCl solution should be approximately (50 ± 10) g/L. Next, reagent-grade copper chloride is added to 3.8 liters of this brine solution and thoroughly dissolved to ensure complete mixing. Finally, the pH of the solution is adjusted using glacial acetic acid to fall within the range of 3.1 to 3.2. Maintaining the correct pH is crucial for ensuring consistent and reliable test results.
The construction of the salt spray test chamber is equally important. Traditional PVC plastic panels are not suitable for this type of test due to their inability to withstand high temperatures and strong acids. The operating temperature inside the chamber is typically 50°C, while the saturated steam chamber reaches around 63°C. Prolonged exposure to these conditions can cause deformation or damage to PVC-based chambers. Therefore, materials such as polypropylene or other corrosion-resistant plastics are commonly used to build the test chamber, ensuring long-term stability and accurate testing performance.
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