Exam Question
Briefly discuss the following and state how these can be prevented.
(a) Hydrogen blistering
(b) Hydrogen embrittlement.
(c) Decarburization.
(d) Hydrogen attack
Class 2 (2nd Engineer)
MEKG
📅 Sep 2022
Reference Answer
### Introduction to Hydrogen Damage
Hydrogen damage refers to the degradation of mechanical properties of a metal resulting from the presence of or interaction with hydrogen. The fundamental mechanism involves the diffusion of highly mobile atomic hydrogen (H) into the metal's crystal lattice. Once inside, this atomic hydrogen can cause various forms of damage depending on the material, temperature, and operating environment. In contrast, molecular hydrogen (H₂) is stable and too large to diffuse through the metal, a key factor in several damage mechanisms.
---
### (a) Hydrogen Blistering
Hydrogen damage refers to the degradation of mechanical properties of a metal resulting from the presence of or interaction with hydrogen. The fundamental mechanism involves the diffusion of highly mobile atomic hydrogen (H) into the metal's crystal lattice. Once inside, this atomic hydrogen can cause various forms of damage depending on the material, temperature, and operating environment. In contrast, molecular hydrogen (H₂) is stable and too large to diffuse through the metal, a key factor in several damage mechanisms.
---
### (a) Hydrogen Blistering
Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.
Prepare on Android — MeoMock on Google Play