AMPP Corrosion Specialist Practice Questions - AMPP Corrosion Specialist Certification Exam

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Electrochemical impedance spectroscopy (EIS) of a coated metal typically shows which behavior when the coating is intact and high-quality?

Low-frequency impedance near 10 ohm·cm2 High low-frequency impedance modulus (>10^9 ohm·cm2) and nearly pure capacitive (phase -90°) behavior No phase shift Only low-frequency response

Correct Answer:

High low-frequency impedance modulus (>10^9 ohm·cm2) and nearly pure capacitive (phase -90°) behavior

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