pintura iii

What is the purpose of a conversion coating on metal surfaces?. To improve paint adhesion. To form an airtight film preventing electrolyte contact. To enhance metal's appearance. To increase metal hardness.

What chemical can be used to form a phosphate film on metal?. Sulfuric acid. Nitric acid. Hydrochloric acid. Phosphoric acid.

What is Alodine used for?. Cleaning metal surfaces. Forming a protective film on metal. Removing paint. Sanding metal.

What is the first step in applying Alodine?. Rinsing with water. Applying a coat of aluminum cleaner. Spraying Alodine. Drying the surface.

How can you check if the surface is free of contaminants after rinsing?. By its color. By its texture. By ensuring it supports an unbroken film of water. By its smell.

How should Alodine be applied to the surface?. Using a cloth. With a brush or spray. By dipping the part. Using sandpaper.

How long should Alodine remain on the surface before rinsing off?. 1 to 2 minutes. 2 to 5 minutes. 5 to 10 minutes. 10 to 15 minutes.

What happens to the Alodine film once it dries?. It becomes hard and protective. It remains soft. It dissolves. It changes color.

Why should rags used to apply Alodine be kept wet until washed?. To avoid contamination. To prevent fire hazard. To keep the metal surface clean. To enhance the coating effectiveness.

What is the primary purpose of a primer in aircraft finishing?. To improve aerodynamics. To provide a bond between the surface and topcoat. To enhance color. To protect from UV rays.

Which primer has been a standard for decades in aircraft finishing?. Epoxy primer. Zinc chromate. Wash primer. Polyurethane primer.

What type of primer is zinc chromate?. Reactive primer. Inhibitive primer. Protective primer. Decorative primer.

What is the base of zinc chromate primer?. Alkyd resin. Epoxy resin. Polyurethane. Acrylic.

Why should zinc chromate not be applied over an improperly cured wash primer?. It will not adhere. It will cause filiform corrosion. It will lose its color. It will dry too quickly.

What is a potential health risk associated with excessive inhalation of zinc chromate dust?. Skin irritation. Eye damage. Lung cancer. Asthma.

What should be used to thin zinc chromate primer for spraying?. Water. Acetone. Toluene. MEK.

What product is used to form a phosphate film on metal surfaces?. Alodine. MEK. Scotch-Brite pad. Zinc chromate.

What is a key characteristic of wash primer?. Long curing time. Quick curing time. High durability. Glossy finish.

How is wash primer prepared?. Mixing 4 parts primer, 1 part activator, and 4-8 parts thinner. Mixing 2 parts primer, 3 parts activator, and 1 part thinner. Mixing 1 part primer, 1 part activator, and 2 parts thinner. Mixing 3 parts primer, 1 part activator, and 2-4 parts thinner.

What is the required thickness for wash primer application?. 0.1 inch. 0.0003 inch. 0.003 inch. 0.03 inch.

What environmental condition is crucial for converting the acid in wash primer to a phosphate film?. High temperature. Low temperature. High humidity. Low humidity.

Which primer gives the best corrosion protection?. Zinc chromate. Epoxy primer. Wash primer. Acrylic lacquer.

What should be done before applying epoxy primer?. Wash the surface with MEK. Sand the surface. Apply a base coat. Heat the surface.

How long should epoxy primer be allowed to cure before applying acrylic lacquer or synthetic enamel topcoats?. 1 hour. 2 hours. 5 hours. 24 hours.

Which type of topcoat is ideally suited for application over epoxy primer?. Acrylic lacquer. Synthetic enamel. Polyurethane. Zinc chromate.

What must be done if epoxy primer has been applied for more than 24 hours before topcoat application?. Apply another coat of epoxy primer. Remove the old primer. Scuff the surface. Apply a base coat.

What type of finishing system is known for its chemical resistance and durability?. Acrylic lacquer. Synthetic enamel. Polyurethane. Epoxy.

What should be done to the primer before applying acrylic lacquer topcoats?. Rub it down with kraft paper. Apply another coat. Heat it. Wash it with MEK.