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Which outcome occurs when nascent hydrogen produced by steel cathodic protection diffuses into the metal lattice?

A)Blister formation due to gas pressure
B)Oxidation caused by catalytic reactions
C)Formation of protective oxide films
D)Improved ductility due interstitial hardening

💡 Explanation

When cathodic protection generates nascent hydrogen, hydrogen atoms diffuse into the steel lattice and combine to form molecular hydrogen, creating internal pressure and causing blistering. Therefore, blister formation occurs, rather than oxidation, film formation, or ductility gains which require different alloying elements or thermal processes.

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