scope:

Scope of application

Part 1 deals with fundamentals, terminology and definitions, as well as the process of a failure analysis and its documentation.

Part 2 to Part 5 describe different types of failures, characteristics of failure and the failure processes:

Part 2: Failures due to mechanical stress

Part 3: Failures due to corrosion in electrolytes

Part 4: Failures due to thermal stress

Part 5: Failures due to tribologic stress

The guidelines VDI 3822 Part 2 to Part 5 are valid only in conjunction with guideline VDI 3822 Part 1.

This guideline deals with failures due to corrosion that occur in, for the most part, aqueous electrolytes at temperatures generally below their boiling points

Most of the types of corrosion discussed are a result of electrochemical reactions. Most of these take place in the presence of ionically conducting phases (electrolyte solutions) and cause the electrolytic loss of metals or the impairment of the material's properties

Corrosion reactions can also take place in the absence of ionically conducting phases. In such cases corrosion is the result of chemical or metal physical processes. This guideline does not address this type of corrosion.

Types of corrosion caused by electrochemical corrosion reactions or by corresponding metal physical and chemical reactions at high temperatures are described in VDI 3822 Part 4.

In the case of the types of corrosion addressed in this guideline we can distinguish between types that are initiated without mechanical stress and those for which mechanical stress on a component is a necessary precondition.

All types of mechanically initiated corrosion, failure, with the exception of tribochemical failures, which will be addressed in VDI 3822 Part 5, are considered in this Part.