A surprising fact is that hydrogen atoms are very small and hydrogen ions even smaller and can penetrate most metals. Hydrogen, by various mechanisms, embrittles a metal especially in areas of high hardness causing blistering or cracking especially in the presence of tensile stresses.
Prevent
This problem can be prevented by
- Using a resistant or hydrogen free material
- Avoiding sources of hydrogen such as cathodic protection, pickling processes and certain welding processes
- Removal of hydrogen in the metal by baking.
Corrosion Main
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