Surface Protection Flashcards
What is the purpose of surface protection treatments?
To prevent corrosion,damage by aggressive fluids & provide erosion protection against metallic structures and UV
What is surface protection use based on?
-material
-function
-location
What do nearly all external areas on an aircraft share?
Surface protection
What areas are exempt from surface protection?
-leading edges of slats,wing tips & fences (bonding primer on anodised surfaces only)
-leading edges of the engine intake cowls
-external surfaces of the pylon made of corrosion resistant materials eg titanium
-scuff plates on passenger or cargo doors
-equipped components eg angles of an attached sensor & static port areas
What are the 3 types of surface protection?
-pre-treatment
-paint coatings
-special coatings
Name 5 methods of surface protection?
-passivisation
-sacrificial coatings
-chemical films
-electroplating
-mechanical processes such as painting
Name the 2 types of pre-treatment?
-anodising
-chromating
Name the two parts in which painting is divided into?
-primer
-topcoat
Name the two types of special coatings?
Type 1 = water repellent coating is generally made from silicone-free materials organically bound with a mineral il base to repel moisture
Type 2 = heavy duty corrosion preventing compound
Name the 3 cleaning methods?
-wet washing
-dry washing
-polishing (broken down into hand & mechanical)
What is the cleaning method used on an aircraft determined by?
Type of dirt & desired result
Define a wet wash?
Removes oil,grease,carbon deposits & most dirt apart from corrosion & oxide films
Define a dry wash?
Removes film,dust & small accumulations of dirt where wet wash isn’t desirable or practical uses spray,mops,cloths etc
Define polishing?
Restores brightness,colour. Done after cleaning & can also remove oxidation + corrosion
Is periodic cleaning part of routine maintenance?
Yes
