How is Lipophilic diffusion stopped?

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Prepare for the Surface Methods - Liquid Penetrant Inspection (LPI) Exam. Utilize flashcards and multiple-choice questions with detailed hints and explanations. Ace your exam with confidence!

Multiple Choice

How is Lipophilic diffusion stopped?

Explanation:
Diffusion of lipophilic penetrant continues as long as there is penetrant at the surface to move toward/away from defects. Stopping this diffusion happens by removing the surface film and drying the surface, which cuts off the driving force and immobilizes the penetrant that remains. Lipophilic (oil-based) penetrants are not effectively removed by water, and heating or adding more penetrant would increase diffusion, not stop it. Drying with air cleanly removes surface residuum and halts further diffusion, preparing for the developer to reveal true indications.

Diffusion of lipophilic penetrant continues as long as there is penetrant at the surface to move toward/away from defects. Stopping this diffusion happens by removing the surface film and drying the surface, which cuts off the driving force and immobilizes the penetrant that remains. Lipophilic (oil-based) penetrants are not effectively removed by water, and heating or adding more penetrant would increase diffusion, not stop it. Drying with air cleanly removes surface residuum and halts further diffusion, preparing for the developer to reveal true indications.

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