High Temperature Corrosion and Degradation Mechanisms

This degradation module summarizes all high temperature corrosion and degradation mechanisms for which currently no specific S-RBI guidance is available. These include:

1. Corrosion

   1. Carburisation

   2. High Temperature Hydrogen Chloride (HCl) and Chorine Corrosion (Cl2)

   3. Metal Dusting

   4. Molten Salt Corrosion (Flue Ash Corrosion)

   5. Nitridation

   6. Oxi-Nitridation

2. High Temperature Material Degradation

   1. 475°C (885°F) Embrittlement

   2. Graphitisation

   3. Hydrogen Embrittlement

   4. Liquid Metal Cracking (LMC) also known as Liquid Metal Embrittlement (LME)

      1. Mercury Attack (of Aluminium)

   5. Reheat Cracking

   6. Short-term Overheating

   7. Sigma Phase Embrittlement (see also SR.16.10663 [1])

   8. Spheroidisation

   9. Strain Ageing