Aviation Institute Of Maintenance (AIM) Block 2 Practice Exam

Which statement describes hydrogen embrittlement risk when using nonapproved cleaners?

Hydrogen embrittlement in metal structures Increased fatigue life Decreased corrosion risk Improved ductility

Correct Answer:

Hydrogen embrittlement in metal structures

Explanation:

Hydrogen embrittlement happens when hydrogen atoms diffuse into metal, making it brittle and more likely to crack under stress. Nonapproved cleaners can release hydrogen or create acidic or aggressive conditions during cleaning, which promote hydrogen uptake in the metal lattice. This is a real risk for aerospace alloys and high‑strength steels used in structural parts, where even normal service loads can cause cracking if hydrogen is trapped in the metal. So the described risk is specifically about hydrogen causing weakening of metal structures. The other ideas—gaining fatigue life, reducing corrosion risk, or improving ductility—don’t match what embrittlement does, which is to make the metal less ductile and more prone to brittle failure.

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