NACE CP2 Exam Questions and Correct Answers 2025/2026

NACE CP2 Exam Questions and Correct Answers 2025/2026 oxidation - Answer -loss of electrons, positive charge atoms (anode) reduction - Answer -gain of electrons, negative charged atoms (cathode) forms of corrosion - Answer -uniform, crevice, galvanic (dissimilar metals) if two metals have to be couple then best to couple metals close together in the galvanic series, pitting, intergranular, selective leaching (dezincification, graphitization), velocity phenomena, environmental cracking (corrosion fatigue, hydrogen embrittlement, SCC (Carbonates/bicarbonates) High PH - Answer -Low hydrogen, alkaline, easy polarization Low PH - Answer -high hydrogen, acidic, harder to polarize High oxygen/High Hydrogen concentration - Answer -harder to polarize, work at the cathode only, called cathodic depolarizers. factors affecting corrosion - Answer -A. anything that affects polarization. (temp. etc...) B. concentration cells (oxygen, temp, etc.) In an oxygen concentration cell, what is the anode? (i.e. the area with more or less oxygen?) In a metal ion cell, which area is the anode (i.e. the area with the greater of lower concentration)? C. Anaerobic bacteria (MIC) Absence of oxygen, depolarizerpolarization - Answer -a. corrosion current reduces with polarization b. polarization increases with CP current applied c. Occurs at surface of both anode and cathode. shielding - Answer -a. shorted casings b. proximity of other structures c. reinforced concrete amphoteric materials - Answer -corrode at low and high pH on potential - Answer -native + polarization + IR drop polarized potential (off) - Answer -native + polarization kirchoff's laws - Answer -a. voltage (series circuits) b. current (parallel circuits) faraday's law - Answer -W=KIT relates weight loss of metal in a corrosion cell with time and current flow. rate of corrosion - Answer -directly proportional to current flow cathodic protection limitations - Answer --shielding issues -attenuation -interference -excessive current density -contact with other metals (shorts)measurement methods - Answer -true voltage reading voltmeter reading % error calculations effect of voltmeter resistance IR correction methods test stations - Answer -allow electrical connection to structure for potential measurements and bonds. Spans allow current and direction (IR drop). inistall during construction pH - Answer -measure of acidity(hydrogen ion concentration) high pH is alkaline low pH is acid