It is complicated to categorically define high temperature without defining first the specific alloy system. The high temperature for a particular metal or alloy can be approximately 30 to 40% of the melting point.
Failures resulting from operation at high temperature can generally be attributed to two main causes:
- Interaction between the alloy and the environment resulting in the loss of protective behaviour, causing accelerated degradation.
- Inadequate control of the conditions of the process, leading to overheating with consequent reduced resistance and an increased corrosion, which can lead to failure.
High temperature corrosion control methods focus on material selection, design, environmental changes, inorganic and/or ceramic coatings.
Identifying corrosion shapes and failures requires specific knowledge, analytical resources, and experience.
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