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→13.4 Testing Procedures for Power Engineering
Main Articel: [[Testing Procedures for Power Engineering| Testing Procedures for Power Engineering]]
==13.5 Corrosion Testing==
===13.5.1 Definition of “Corrosion”===
The definition of corrosion can be found in DIN 500900 Part 1 as follows: Reaction of a metallic material with its environment, which produces a
measurable change in the material and can lead to corrosion damage. This reaction is in most cases an electrochemical one. It can however also be based on chemical and metal-physics effects.
During corrosive influences metal is dissolved. This metal loss can be uniformly spread out over a certain area or be limited to locally smaller spots. This process usually proceeds with constant speed up to the total material loss, or after certain reaction times a natural corrosion limiting surface layer can be formed (i.e. on aluminum).
===13.5.2 Special Types of Corrosion===
*Contact corrosion: <br />Corrosion of a metal object after coming into physical contact with another metallic body. This can occur also on metallic impurities in alloys, on chemically and physically heterogeneous surfaces and on heterogeneous solutions on homogeneous surfaces, as well as through contacting a metal object by non-metallic materials through formation of corrosion compounds.<br />
