What are the forms of damage caused by hydrogen damage?
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I saw an exam question (multiple choice): The failure modes of hydrogen damage in the materials of pressure vessels are (ABCD). (A). Hydrogen embrittlement (B). Hydrogen blistering (C) Decarburization (D) Hydrogen corrosion ； I always confuse hydrogen damage with hydrogen corrosion, and I think that hydrogen corrosion includes hydrogen embrittlement, bulging, decarburization, and cracking. Could someone please help clarify this for me?
Hydrogen embrittlement can’t be entirely attributed to corrosion, right?
Hydrogen embrittlement occurs when hydrogen dissolved in steel combines to form hydrogen molecules, resulting in stress concentration that exceeds the steel’s strength limit and leads to the formation of tiny cracks within the steel, also known as white spots. Hydrogen embrittlement can only be prevented, not cured. Once hydrogen embrittlement occurs, it cannot be eliminated. Trace amounts of hydrogen (on the order of 10 to the negative 6 power) that enter the steel during its smelting process and during the manufacturing and assembly of parts (such as electroplating and welding) can cause the material to become brittle or even crack under the effect of internal residual stresses or external stresses.
This post was last edited by Wang Wei2 on 2021-12-27 at 14:43. Hydrogen corrosion is the corrosion that occurs when hydrogen reacts with metals under certain temperatures and pressures; its main manifestations include hydrogen embrittlement, bulging, and cracking.
Thank you so much! Is hydrogen corrosion the destructive form of hydrogen damage?