October 2015 Spray 25 Why not raise the storage test temperature to accelerate the coating or metal corrosion? Increasing the storage test temperature does not normally increase the rate of detinning corrosion, aluminum or steel pitting corrosion or polymer laminate and coating corrosion (e.g., blistering). Consequently, raising the storage test temperature does not normally increase the rate of corrosion. In other words, storing test packages at 100°F (37°C) does not reduce the test time needed for a room temperature storage test. There are instances where thermally unstable products cause package corrosion above room temperature (i.e., 70°F). Thus, higher temperature testing is necessary to determine the thermal stability of your spray product in warmer climates, and if thermal instability contributes to or causes package corrosion. We would be happy to teach our Elements of Spray Package (Aerosol Container) Corrosion short course at your R&D facility. Want a specific topic discussed in an issue of Corrosion Corner? Please send your suggestion/ questions/comments to rustdr@pairodocspro.com or visit www.pairodocspro.com. Back articles of Corrosion Corner are available from Spray. Thanks for your interest and I’ll see you in November. SPRAY Figure 2: The behavior of corrosion with time
Spray October2015
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