Exam Question
Briefly discuss the following and state how these can be prevented.
(a) Hydrogen blistering (4)
(b) Hydrogen embrittlement (4)
(c) Decarburization (4)
(d) Hydrogen attack (4)
Class 2 (2nd Engineer)
MEKG
📅 Mar 2024
Reference Answer
### (a) Hydrogen Blistering (4 Marks)
**Discussion:**
Hydrogen blistering is a form of mechanical damage caused by the accumulation of hydrogen gas within a metal. The process occurs in distinct stages:
1. **Hydrogen Generation:** An external corrosion process (e.g., in a sour environment containing H₂S) produces atomic hydrogen (H) on the metal surface.
**Discussion:**
Hydrogen blistering is a form of mechanical damage caused by the accumulation of hydrogen gas within a metal. The process occurs in distinct stages:
1. **Hydrogen Generation:** An external corrosion process (e.g., in a sour environment containing H₂S) produces atomic hydrogen (H) on the metal surface.
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