NACE CP1 questions and answers with solutions 2025

corrosion - ANSWER The deterioration of a substance, usually a metal from a reaction with its environment Passivation - ANSWER A layer of oxides formed on the surface of a metal that provides corrosion protection. the elements of a corrosion cell - ANSWER Anode, cathode, metallic pathway, electrolyte what happens at the anode - ANSWER The metal dissolves into the electrolyte the function of the metallic pathway - ANSWER Allows the flow of electrons to connect the corrosion cell galvanic series - ANSWER A listing in order of reactivity ( more or less noble) in seawater 25c The general rules of galvanic corrosion - ANSWER The less noble (more reactive) metal when connected to a more noble (or less reactive metal) will corrode preferentially. the five most important factors that affect the rate of corrosion. - ANSWER Humidity, oxygen, chemical salts, pollutants, temperature General corrosion - ANSWER Results in a relatively uniform loss of material over the entire surface. Results in a general thinning of the affected surface. Realively easy to inspect. Does not cause catastrophic failures. Localized corrosion - ANSWER Typically pitting and crevice corrosion. It is typically of the most concern as damage is concentrated and loss of integrity or structure failure can result. Common tool/ methods used for corrosion control. - ANSWER Design, inhibitors, material selection, cathodic protection, protective coatings, splas