AMPP CP4 Specialist Practice Questions - AMPP CP4 Cathodic Protection Specialist Exam

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Which of the following BEST describes the hydrogen embrittlement risk for high-strength prestressing wire in PCCP when CP is over-applied?

Atomic hydrogen produced at the cathode under very negative potentials can diffuse into the steel lattice and cause brittle failure of the prestressing wire, sometimes catastrophically No risk at any potential Only a concern in fresh water Only affects coatings

Correct Answer:

Atomic hydrogen produced at the cathode under very negative potentials can diffuse into the steel lattice and cause brittle failure of the prestressing wire, sometimes catastrophically

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