Issues related to hydrogen embrittlement
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This post was last edited by Rush2009 on 2010-8-31 at 11:46. Can anyone explain the issue of hydrogen embrittlement, for example, into which categories it can be divided? Is there such a thing as methane being formed from carbon in steel?
Hydrogen embrittlement is a phenomenon in which steel loses its strength and ductility under the influence of high-temperature and high-pressure hydrogen, resulting in brittle fracture at the fracture surface. The cause is that under high temperature and pressure, hydrogen enters the interior of the steel and reacts with cementite to produce methane, thereby significantly reducing the decarburization resistance of the steel. The properties of the steel can be restored through dehydrogenation treatment (for example, by heating to above 200°C for several hours to reduce internal hydrogen) before cracking occurs. However, heating will damage the coating; therefore, heat treatment is not suitable for electroplated workpieces.
For details, see the Nelson curve....