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Which risk increases when dissolved hydrogen reaches supersaturation in aluminum alloys?

A)Hydrogen embrittlement crack propagation
B)Galvanic corrosion rate decreases
C)Oxidation layer prevents diffusion
D)Improved weld strength and hardness

💡 Explanation

Hydrogen embrittlement promotes crack propagation because atomic hydrogen diffuses to regions of high stress, reducing the material's ductility. Therefore, failure risk elevates dramatically, rather than enhancing strength or preventing diffusion due to typical oxidation behaviours or galvanic inertness.

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