NACE 2 Ultimate Study Guide
Questions and Answers | Latest
Version | 2025/2026 | Correct & Verified
What is the primary purpose of protective coatings on steel?
✔✔To prevent corrosion by isolating the metal from the environment.
Which type of corrosion occurs uniformly across a metal surface?
✔✔Uniform corrosion.
Why is surface preparation critical before coating application?
✔✔To ensure proper adhesion and maximize coating performance.
Which abrasive blasting method produces the cleanest metal surface?
✔✔White metal blast cleaning.
What does SSPC-SP 6 standard represent?
✔✔Commercial blast cleaning.
Which environmental factor most accelerates steel corrosion?
✔✔Presence of moisture and oxygen.
Why should a home inspector check the substrate temperature before coating?
1
,✔✔Because temperature affects coating adhesion and curing.
Which defect appears as small raised bubbles on a coating?
✔✔Blistering.
What is the primary function of a primer in a coating system?
✔✔To provide corrosion protection and enhance adhesion for subsequent layers.
Which tool is used to measure surface profile after blasting?
✔✔Replica tape or depth gauge.
Why is measuring dry film thickness important?
✔✔To ensure the coating meets specification and provides adequate protection.
Which corrosion occurs when two dissimilar metals are electrically connected?
✔✔Galvanic corrosion.
What is the main cause of coating delamination?
✔✔Poor surface preparation or contamination.
Which coating defect looks like wrinkled skin?
✔✔Wrinkling.
2
,Why should relative humidity be monitored during coating application?
✔✔High humidity can cause condensation, leading to coating failure.
Which coating failure appears as fine cracks across the surface?
✔✔Checking or crazing.
What is the purpose of an intermediate coat?
✔✔To build thickness and enhance overall protection of the coating system.
Which coating property allows it to stretch without cracking?
✔✔Flexibility.
Why is adhesion testing important?
✔✔To verify the coating properly bonds to the substrate.
Which corrosion type occurs in confined areas with stagnant water?
✔✔Crevice corrosion.
Why is it important to check the surface for oil or grease before coating?
✔✔Contaminants prevent proper adhesion and can cause coating failure.
3
, What does DFT stand for?
✔✔Dry Film Thickness.
Which tool measures DFT on ferrous metals?
✔✔Magnetic pull-off or electronic gauge.
Why should coatings not be applied below the dew point?
✔✔Condensation can form on the surface, preventing proper adhesion.
Which coating defect appears as small holes exposing the metal?
✔✔Pinholing.
Why is UV resistance important in topcoats?
✔✔To prevent degradation from sunlight and maintain appearance.
Which coating component provides corrosion resistance and pigment color?
✔✔Pigment.
What is the purpose of binders in a coating?
✔✔To form the film and bind pigments together for durability.
Which type of corrosion results in deep, localized pits?
4
Questions and Answers | Latest
Version | 2025/2026 | Correct & Verified
What is the primary purpose of protective coatings on steel?
✔✔To prevent corrosion by isolating the metal from the environment.
Which type of corrosion occurs uniformly across a metal surface?
✔✔Uniform corrosion.
Why is surface preparation critical before coating application?
✔✔To ensure proper adhesion and maximize coating performance.
Which abrasive blasting method produces the cleanest metal surface?
✔✔White metal blast cleaning.
What does SSPC-SP 6 standard represent?
✔✔Commercial blast cleaning.
Which environmental factor most accelerates steel corrosion?
✔✔Presence of moisture and oxygen.
Why should a home inspector check the substrate temperature before coating?
1
,✔✔Because temperature affects coating adhesion and curing.
Which defect appears as small raised bubbles on a coating?
✔✔Blistering.
What is the primary function of a primer in a coating system?
✔✔To provide corrosion protection and enhance adhesion for subsequent layers.
Which tool is used to measure surface profile after blasting?
✔✔Replica tape or depth gauge.
Why is measuring dry film thickness important?
✔✔To ensure the coating meets specification and provides adequate protection.
Which corrosion occurs when two dissimilar metals are electrically connected?
✔✔Galvanic corrosion.
What is the main cause of coating delamination?
✔✔Poor surface preparation or contamination.
Which coating defect looks like wrinkled skin?
✔✔Wrinkling.
2
,Why should relative humidity be monitored during coating application?
✔✔High humidity can cause condensation, leading to coating failure.
Which coating failure appears as fine cracks across the surface?
✔✔Checking or crazing.
What is the purpose of an intermediate coat?
✔✔To build thickness and enhance overall protection of the coating system.
Which coating property allows it to stretch without cracking?
✔✔Flexibility.
Why is adhesion testing important?
✔✔To verify the coating properly bonds to the substrate.
Which corrosion type occurs in confined areas with stagnant water?
✔✔Crevice corrosion.
Why is it important to check the surface for oil or grease before coating?
✔✔Contaminants prevent proper adhesion and can cause coating failure.
3
, What does DFT stand for?
✔✔Dry Film Thickness.
Which tool measures DFT on ferrous metals?
✔✔Magnetic pull-off or electronic gauge.
Why should coatings not be applied below the dew point?
✔✔Condensation can form on the surface, preventing proper adhesion.
Which coating defect appears as small holes exposing the metal?
✔✔Pinholing.
Why is UV resistance important in topcoats?
✔✔To prevent degradation from sunlight and maintain appearance.
Which coating component provides corrosion resistance and pigment color?
✔✔Pigment.
What is the purpose of binders in a coating?
✔✔To form the film and bind pigments together for durability.
Which type of corrosion results in deep, localized pits?
4
