Hydrogen embrittlement is an undesirable process resulting
loss of ductility of metal, decrease
of the toughness and reduction of load-bearing
capability occurs due to the absorption of hydrogen atoms by the
metal. So that there is crack formation in metal component and fracture at lower
stresses conditions.
There
are mainly two types of Hydrogen embrittlement. The first one is internal hydrogen embrittlement,
It occurs when the hydrogen dissolved in molten metal which becomes
supersaturated with hydrogen immediately after solidification.
And
the second type is environmental hydrogen embrittlement,
which results from by hydrogen absorption by the solid metal. This condition
can occur during high-temperature thermal treatment & during
electroplating, during corrosion reactions, during cathodic protection,
operating hydrogen in high-pressure conditions etc.
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