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Normas de Teste para Câmaras de Teste de Spray de Sal | Guia ASTM B117 e ISO 9227
Understanding Salt Spray Testing Salt spray testing is an accelerated corrosion test that uses a controlled salt fog environment to evaluate how well materials and coatings resist rust and corrosion. This method speeds up the natural corrosion process so manufacturers can predict product durability quickly. How Salt Spray Chambers Work Salt spray chambers create a fine mist of salty water through atomization. Inside the chamber, temperature and fog distribution are tightly controlled to ensure consistent, uniform exposure for every test sample. This setup simulates harsh outdoor conditions in a lab setting. Key Test Types Limitations to Keep in Mind Salt spray tests are excellent for comparing relative corrosion resistance between products or coatings. However, they don’t always predict exact real-world performance since actual environments vary in temperature, humidity, and contaminants. Use salt spray results as part of a broader corrosion evaluation strategy. Major International Standards for Salt Spray Testing When it comes to salt spray test standards, two big names lead the way: ASTM B117 and ISO 9227. Both set the rules for how salt spray chambers should operate, so you get consistent, reliable results. ASTM B117 – The Go-To Standard for NSS Testing ASTM B117 is the most widely used standard in the U.S. for Neutral Salt Spray (NSS) tests. Here are the key specs it covers: Parameter ASTM B117 Requirement Salt Solution 5% Sodium Chloride (NaCl) pH Range 6.5 to 7.2 Temperature 35°C ± 2°C Fog Collection Rate 1–2 ml per 80 cm² per hour Apparatus Specs Specific chamber dimensions & airflow rules Solution Prep Strict mixing procedures The standard mostly focuses on creating a consistent salt fog environment to test corrosion resistance on metals and coatings. ISO 9227 – International Salt Spray Test Guide ISO 9227 covers NSS like ASTM B117 but also expands to other test…
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