【Basic Knowledge 19】What are hydrogen-resistant materials? (Premiated quiz)

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This post was last edited by lzy4225925 on 2015-12-19 22:01. What are hydrogen-resistant materials? Metal materials that can resist hydrogen damage or hydrogen embrittlement. Hydrogen damage refers to the damage that occurs in metals or alloys under tensile stress due to the presence of excessive hydrogen. Its manifestations mainly include hydrogen-induced plasticity loss, high-temperature hydrogen corrosion, hydrogen-induced irreversible damage (white spots, hydrogen bubbles, hydrogen-induced cracks, etc.), and hydrogen-induced delayed fracture. Hydrogen embrittlement refers to the phenomenon of material becoming brittle under the influence of internal hydrogen or ambient hydrogen. Common anti-hydrogen materials include austenitic stainless steels, precipitation-hardened austenitic alloys, low-alloy steels, aluminum alloys, and copper alloys. The main characteristic of hydrogen-resistant materials is that alloys with a face-centered cubic structure exhibit better hydrogen resistance than those with a body-centered cubic structure ； Anti-hydrogen alloys are sensitive to hydrogen only within a certain temperature range ； The hydrogen resistance of an alloy is related to its grain size and strain rate; the finer the grains, the better the hydrogen resistance, and as the strain rate increases, the tendency to hydrogen embrittlement decreases. Anti-hydrogen materials can be used as structural materials under high-pressure hydrogen conditions (715 MPa), as well as as lining materials for hydrogenation reactors and in the manufacture of hydrogen storage vessels.