The essential facts about the nature of hydrogen embrittlement have been known since the 19th century. Copper, aluminium, and stainless steels are less susceptible to hydrogen embrittlement. Hydrogen embrittlement occurs most notably in steels, as well as in iron, nickel, titanium, cobalt, and their alloys. Once absorbed, hydrogen lowers the stress required for cracks in the metal to initiate and propagate, resulting in embrittlement. ![]() Hydrogen atoms are small and can permeate solid metals. ![]() Hydrogen embrittlement ( HE), also known as hydrogen-assisted cracking or hydrogen-induced cracking ( HIC), is a reduction in the ductility of a metal due to absorbed hydrogen.
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