Agglomeration is can be defined as a process of
collecting in a mass or a particle size-enlargement technique in which the
primary particles are joined with each other, having the relatively weak force
between the particles or externally added elements.
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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