FAQ 4: What corrosion inhibitor works for most, if not all, spray package corrosion? No single corrosion inhibitor works for all situations. The chemical composition of your formula and types of materials used in your spray package determine if an individual inhibitor or an inhibitor blend inhibits package corrosion by your formula. FAQ 5: How long does a corrosion test need to last before making a commercial decision? It has been my experience that a storage test needs to be conducted for at least one year to reduce the corrosion risk to approximately 7%. Shorter storage test times have larger risks. Electrochemical corrosion testing requires less time because sensitive electronic instruments are used to detect corrosion long before it can be seen with the unaided eye or with a light microscope. The length of an electrochemical test is determined by the type of protocol used and the type of package being tested. FAQ 6: Can I use higher temperatures to shorten the length of a storage test? Corrosion of metals and polymers does not follow the Arrhenius equation. In other words, raising the storage test temperature does not accelerate corrosion of spray package materials and thus allow one to shorten the storage test length. Please see the March 2017 Corrosion Corner for a more detailed discussion on why higher temperatures do not accelerate the corrosion of spray package materials. Pair O Docs has a state-of-the art electrochemical corrosion testing laboratory; please contact me if you would like to know more about our faster and predictive corrosion testing. You can also visit our new website which has a short Vision Video that discusses all our corrosion prevention and control services. Please also contact me if you would like to a have our Elements of Spray Package Corrosion short course taught at your R&D facility. Thank you for reading Corrosion May 2017 Spray 35 Corner and I’ll see you in June. SPRAY
Spray May 2017
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