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Which outcome occurs with increased hydrogen partial pressure?

A)Hydrogen embrittlement reduces fracture toughness
B)Increased oxide layer formation occurs
C)Lattice diffusion rates decrease sharply
D)Improved passivation layer creates stability

💡 Explanation

Increased hydrogen partial pressure induces hydrogen embrittlement, leading to a reduction in fracture toughness because diffusing hydrogen atoms weaken metal bonds causing crack propagation. Therefore, metal cracking resistance decreases, rather than increased passivation, since a different failure mechanism occurs.

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