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A device measuring solution resistance across a gold interdigitated electrode, surface temperature and relative humidity, dynamically monitors environmental parameters on board a naval ship over the period of 9 months. Rigorous statistical analysis is used to analyze solution resistance data.
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Evaluating the location-based risk of corrosion is critical to a number of fields of industry. Within naval aviation, knowing the risk of corrosion from environmental factors can be used to ensure that maintenance intervals are properly planned. From a basic research aspect, understanding how different sites behave allows researchers to better correlate how performance at a standard test site can be extrapolated in future research efforts. However, a survey of literature and conversations with many corrosion experts has shown variability in how environmental factors are assessed.
A series of experiments was conducted to examine the repeatability of corrosion rates of various coupons, cleaning procedures prior to exposure inside a test chamber, and removal of corrosion byproducts after their exposure.
Atmospheric corrosion of metal alloys in cold environments is assumed to be negligible. However, studies in the Arctic and Antarctic regions have shown significant corrosion damage when exposed to cold conditions. While thermodynamically this is correct, other factors in such environments can be responsible for driving corrosion.
Atmospheric corrosion proceeds via several processes that proceed in sequence and/or parallelacross multiple classes of matter (the atmosphere, condensed aqueous solution, polymer coatings, oxidescales, precipitated salts, and microstructurally heterogeneous metal alloys). Multiple physical andchemical phenomena contribute to the process of corrosion, including mass-transport, electrochemicaleffects, metal dissolution, grain-boundary transport, etc. For this reason, it is difficult to directly predict,using fundamental physics or chemical principles, the corrosion rate of a metal in its environment.