CCT Surface Preparation & Bonding Techniques Flashcards

What is the primary purpose of surface preparation before bonding composite parts?

Answer: To improve adhesion by removing contaminants and creating surface energy

Surface preparation removes contaminants and increases surface energy to maximize adhesive bond strength.

Which solvent is commonly used to clean composite surfaces before bonding?

Answer: Methyl ethyl ketone (MEK) or acetone

MEK and acetone effectively remove oils, mold release agents, and other contaminants from composite surfaces before bonding.

What does peel ply leave behind when removed from a cured composite surface?

Answer: A textured, chemically active surface ready for bonding

Peel ply creates a textured, resin-rich surface that is chemically active and ready for secondary bonding without additional abrasion.

What is the purpose of abrasion sanding during composite bonding surface preparation?

Answer: To create mechanical interlocking sites and increase surface area

Abrasion sanding creates microscopic mechanical interlocking sites and increases surface area, improving mechanical adhesion of the bond.

How must aerospace film adhesives typically be stored to maintain their properties?

Answer: In a freezer to prevent premature cure

Aerospace film adhesives are stored in a freezer to halt the cure reaction and preserve their tack and mechanical properties until use.

What is the purpose of applying a primer to composite surfaces before adhesive bonding?

Answer: To enhance adhesion, corrosion resistance, and chemical compatibility

Primers enhance adhesion between the adhesive and substrate, provide corrosion resistance, and improve chemical compatibility for a durable bond.