Most designers protect field process instrumentation and control equipment against the effects of its environment by using some form of enclosure. But if, as is often the case, the environment contains corrosive chemicals, the long term integrity of the enclosure can be threatened. Corrosion is a gradual, diffusioncontrolled process, causing progressive destruction of metal through electrochemical reaction. For any application with a long lifecycle, it is therefore essential that the enclosure fabrication material does not contribute to, or suffer from, corrosion.
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