NACE CP1 – EXAM
Questions and Answers
1. corrosion
ANS The deterioration of a substance, usually a metal from a reaction with its environment
2. Passivation
ANS A layer of oxides formed on the surface of a metal that provides corrosion protection.
3. the elements of a corrosion cell
ANS Anode, cathode, metallic pathway, electrolyte
4. what happens at the anode
ANS The metal dissolves into the electrolyte
5. the function of the metallic pathway
ANS Allows the flow of electrons to connect the corrosion cell
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5
, 6. galvanic series
ANS A listing in order of reactivity (more or less noble) in seawater 25c
7. The general rules of galvanic corrosion
ANS The less noble (more reactive) metal when connected to a more noble (or less
reactive metal) will corrode preferentially.
8. the five most important factors that affect the rate of corrosion.
ANS Humidity, oxygen, chemical salts, pollutants, temperature
9. General corrosion
ANS 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.
10. Localized corrosion
ANS 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.
11. Common tool/ methods used for corrosion control.
2/
5
Questions and Answers
1. corrosion
ANS The deterioration of a substance, usually a metal from a reaction with its environment
2. Passivation
ANS A layer of oxides formed on the surface of a metal that provides corrosion protection.
3. the elements of a corrosion cell
ANS Anode, cathode, metallic pathway, electrolyte
4. what happens at the anode
ANS The metal dissolves into the electrolyte
5. the function of the metallic pathway
ANS Allows the flow of electrons to connect the corrosion cell
1/
5
, 6. galvanic series
ANS A listing in order of reactivity (more or less noble) in seawater 25c
7. The general rules of galvanic corrosion
ANS The less noble (more reactive) metal when connected to a more noble (or less
reactive metal) will corrode preferentially.
8. the five most important factors that affect the rate of corrosion.
ANS Humidity, oxygen, chemical salts, pollutants, temperature
9. General corrosion
ANS 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.
10. Localized corrosion
ANS 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.
11. Common tool/ methods used for corrosion control.
2/
5
