NAVAIR 01-1A-509-1, Ch. 3 Flashcards Preview

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Flashcards in NAVAIR 01-1A-509-1, Ch. 3 Deck (68)
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1

Aluminum and magnesium form corrosion products that are white oxides or what else?

Hydroxides

2

What is the most common type of corrosion (and the one that can be most effectively treated by maintenance personnel)?

Electrochemical

3

What is the smallest unit of an element, made up of a positively charged nucleus surrounded by a system of negatively charged electrons?

Atom

4

There are over how many elements?

100

5

What is a negatively charged subatomic particle called?

Electron

6

What cannot move through metal conductors?

Ions

7

What is a liquid (usually water) solution containing ions called?

Electrolyte

8

Which branch of science is concerned with chemical reactions at surfaces in contact with electrolytes?

Electrochemistry

9

How many conditions must exist before metal corrosion can occur?

4

10

What is corroding metal called?

Anode

11

When corrosion products form, they often precipitate onto the corroding surface as a what?

Powdery deposit

12

Since corrosion products occupy more volume than the original metal, the paint surfaces may become blistered, flaked, chipped, or appear in which way?

Lumpy

13

Which stage is the best time to prevent corrosion?

Design

14

Aluminum, steel, titanium, along with which other type of metal are the most commonly used in aircraft construction?

Magnesium

15

Most alloys are made up entirely of small crystalline regions called what?

Grains

16

Which form of corrosion are many alloys used in aircraft construction sensitive to?

Stress corrosion cracking

17

Which type of corrosion is probably the most common type?

Uniform surface

18

Which type of corrosion occurs when different metals are in contact with each other and an electrolyte?

Galvanic

19

What is a form of extremely localized attack that results in holes in the metal?

Pitting

20

Which type of metals are most susceptible to pitting damage?

Stainless steels

21

Which type of corrosion is an attack on the grain boundaries of the metal?

Intergranular

22

What is an advanced form of intergranular corrosion where the surface grains of a metal are lifted up by the force of expanding corrosion products occurring at the grain boundaries?

Exfoliation

23

Which type of corrosion occurs because the environment of the local area is very different from the larger environment?

Crevice

24

Which type of corrosion is a form of crevice corrosion which occurs on metal surfaces having a thin (~4 mils) organic protective coating?

Filiform

25

Filiform corrosion occurs when the relative humidity of the air is between 65- 90%, and the air temperature is between which temperatures?

70°- 100°F

26

Which type of corrosion is the increase in the rate of attack on a metal due to the action of a corrosive fluid against the metal surface?

Erosion

27

Which type of corrosion is the intergranular or transgranular cracking of a metal caused by the combined effects of constant tensile stress (internal or applied) and corrosion?

Stress

28

Aluminum alloy can fail by stress corrosion cracking when subjected to a stress which is only what percent of its rated strength?

10%

29

What is the cracking of metals known as that is caused by the combined effects of cyclic stress and corrosion?

Corrosion fatigue

30

Which type of corrosion occurs at contact areas between materials under load subject to repeated vibration?

Fretting