Ashcroft. Since the dawn of the Iron Age, people have struggled with the detrimental effects of corrosion. Caused by natural chemical reactions with substances that contact the surface, this destructive process deteriorates metals and affects their properties. Despite this shortcoming, they have been an integral part of the growth of our civilization, allowing us to build taller buildings, bigger ships and superior machinery. However, since 1200 B.C. when iron was first applied, corrosion is still metal’s Achilles heel. Corrodents can exist in the environment surrounding the instrument as well as the pressure medium that is in contact with the elastic element inside.