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← ScienceWhich risk increases when dissolved hydrogen reaches supersaturation in steel?
A)Catalytic surface passivation
B)Excessive grain boundary diffusion
C)Hydrogen embrittlement cracking✓
D)Increased electrical resistivity
💡 Explanation
Hydrogen embrittlement becomes more likely because hydrogen atoms diffuse to regions of high stress at grain boundaries, leading to crack inititiation. Therefore 'hydrogen embrittlement' is the result, rather than surface passivation, since stress cracks form under high hydrogen levels.
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