Theory Questions with Correct Answers
2025/2026 Updated New!!
What are Volatile Organic Compounds (VOCs)? - CORRECT ANSWER -
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Chemicals that easily evaporate at room temperature.
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What are solvents? - CORRECT ANSWER -
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Substances that dissolve other substances to form a solution. I l I l I l I l I l I l I l I l
Why can solvents in coatings be harmful? - CORRECT ANSWER -
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Because they can release VOCs into the air.
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What are some examples of solvents used in coatings? - CORRECT ANSWER -
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Acetone, toluene, xylene, and ethyl acetate.
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What are three commonly used galvanic anodes for carbon steel? - CORRECT ANSWER
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- Zinc, Aluminum, and Magnesium
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What is the effect of temperature on corrosion rate? - CORRECT ANSWER -
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Decrease in temperature decreases corrosion rate.
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What is an electrolyte? - CORRECT ANSWER -A medium that carries ionic current.
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What is sacrificial coating? - CORRECT ANSWER -
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A type of coating that becomes the anode of an electrochemical cell.
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What is the role of binders in coating? - CORRECT ANSWER
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- Binders form a stable film that retains its properties.
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,What is a barrier coating? - CORRECT ANSWER -
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A coating that interrupts the electrolyte of an electrochemical cell.
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What are two environments most susceptible to corrosion? - CORRECT ANSWER
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- Marine Environment, Chemical with High Humidity Environment
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What is the direction of electron flow in an oxidation reaction? - CORRECT ANSWER -
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From the anode to the cathode through the metallic path.
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What is the role of binders? - CORRECT ANSWER -
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Binders bonds pigments together and adhere to
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surface.
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What are solvents? - CORRECT ANSWER -Solvents are liquids that dissolve the solid resins.
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What is the purpose of pigments? - CORRECT ANSWER -
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Pigments hide the substrates, provide decorative color, and enhance desired properties.
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What are additives? - CORRECT ANSWER -
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Additives are special purpose ingredients used to enhance the performance.
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What are vehicles? - CORRECT ANSWER -Vehicles are the liquid portions of the coating.
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What is corrosion? - CORRECT ANSWER -
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Deterioration of metal or alloy due to electrochemical reaction. I l I l I l I l I l I l I l I l
What is passivation? - CORRECT ANSWER -
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Layer of oxides on metal surface for corrosion protection.
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,Give an example of a metal that undergoes passivation. - CORRECT ANSWER -Stainless steel
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What is an anode? - CORRECT ANSWER -The electrode where oxidation occurs.
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What is a cathode? - CORRECT ANSWER -The electrode where reduction occurs.
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What is a metallic pathway? - CORRECT ANSWER -The conductive path for electrons to flow.
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What are electrolytes? - CORRECT ANSWER -
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Substances that conduct electricity when dissolved in water. I l I l I l I l I l I l I l
What is the function of an electrolyte in corrosion? - CORRECT ANSWER
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- Allows passage of ions in corrosion cell.
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What is the function of a metallic pathway in corrosion? - CORRECT ANSWER -
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Allows flow of electrons in corrosion cell.
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What is the galvanic series? - CORRECT ANSWER -Listing of metals in order of reactivity.
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What is the general rule of the galvanic series? - CORRECT ANSWER -
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Less noble metal connected to a more noble metal will corrode preferentially.
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What is localized corrosion? - CORRECT ANSWER -Corrosion that occurs in specific areas.
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What are the types of localized corrosion? - CORRECT ANSWER -
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Pitting and crevice corrosion.
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, Why is localized corrosion concerning? - CORRECT ANSWER -
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Damage is concentrated and can lead to structural
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Ifailure.
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What is general corrosion? - CORRECT ANSWER -
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Uniform loss of material over entire surface.
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How does general corrosion affect the surface? - CORRECT ANSWER
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- Results in general thinning of affected surface.
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Is general corrosion easy to inspect? - CORRECT ANSWER -
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Yes, it is relatively easy to inspect.
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Does general corrosion cause catastrophic failure? - CORRECT ANSWER -
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No, it does not cause catastrophic failure.
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What is inorganic convertible thermosetting? - CORRECT ANSWER -
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Coating that undergoes irreversible chemical changes upon
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curing.
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What is inorganic non-convertible thermoplastic? - CORRECT ANSWER -
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Coating that softens upon heating and hardens upon cooling.
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What are the primary components of a liquid applied coating? - CORRECT ANSWER -
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Pigments and Vehicle (Resin or Binder and Solvent)
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What is a sacrificial coating system? - CORRECT ANSWER -
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A coating system where a more active metal is applied over a less active metal to act as
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an anode and protect the underlying metal.
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