Materials And Corrosion Chap 6 Flashcards
Metals and alloys in aircraft should conform to …
How are metals and alloys identified
Colour codes
What do the British measure in
Standard wire gauge
What do french measure in
mm
What do Americans measure in
1000th of an inch
Def stan
Most frequently used in MOD
Conformity
A certificate to prove that the materials used are good quality
What is the colour coding
Used for rapid identification not to be used as sole means of identification
How are gauge sheets marked
Printed with ink on the surface
Ferrous metals
Contains mostly iron
Non-Ferrous metals
Contains no iron
Annealing
Changes the metal into a soft condition
Heat treatment
Metal is quenched and gives the metal specific properties
Refrigerated storage
Slows down the natural age process
Artificially age treatment
Precipitation (accelerated) treatment to get the maximum strength
Natural age process
Occurs at room temperature
Environmental damage
Includes corrosion, erosion and degradation of surface finish.
Prevention = coatings, tapes and corrosion prevention compounds
What does corrosion lead too
Reduce static strength, stress corrosion cracking, shortens fatigue life
Composite structure gets affected by what ? (4)
Fuels oils lubricants and UV light
Permanent coating
Includes paint
Supplementary protective
Temporary
Eg PX24
Iron and steel corrosion what do you see
Red rust deposits
What do you see with Aluminium and magnesium alloys corrosion
White to grey powdery deposits (magnesium is fluffy)
Most common
Surface corrosion
Sea air
Exhaust gases
Funnel smoke
