Test

Question 1

Uniform surface corrosion leads to ____?

Answer 1

PITTING

Question 2

What kind of process is ANODIZING? Anodizing acts like what?

Answer 2

it is an ELECTROLYTIC process and it acts as an insulator

Question 3

Uniform surface corrosion can cause ____

Answer 3

causes dulling

Question 4

Magnesium parts are cleaned with ____

Answer 4

Non metallic tools and chromic acid

Question 5

Sea planes bilge is the bottom of the fuselage and is inside of the hull and it is protected by

Answer 5

Potassium dichromate

Question 6

Titanium is inherently ____ …and is it as strong as steel? Is it lighter?

Answer 6

Corrosion resistant and is as strong as steel but 45% lighter than steel

Question 7

When removing corrosion from magnesium parts use ____

Answer 7

Non metallic stiff bristle brushes - do not use metallic tools

Question 8

Most aircraft hardware is plated with ___

Answer 8

CADMIUM - should not be used for high temp applications such as 450 degrees as cadmium will diffuse into base metal and will become brittle

Question 9

Oxidation is known as ____ and occurs when?

Answer 9

DRY CORROSION and occurs when a metal is exposed to a gas containing oxygen

Question 10

Exfoliation occurs where/how?

Answer 10

Occurs in layered grain structure in extruded materials and looks like flaking and lifting at the surface

Question 11

Steels corrosion looks like ___

Answer 11

Reddish rust

Question 12

Anodizing damaged coating can be restored by ____

Answer 12

Partially restore by chemical surface treatment = alodine
Applied by dipping / brushing
Provides an oxide film

Question 13

Concentration cell corrosion is found where?

Answer 13

Found in overlapping surfaces - fretting

Question 14

Some metal alloys corrode because they are returning to____

Answer 14

Their natural state

Question 15

Anode / anodic

Answer 15

Positive charge

Question 16

Cathodic

Answer 16

Negative charge

Question 17

Aircraft’s are stored in the desert because

Answer 17

Air is dry less moisture - slows corrosion process

Question 18

Titanium alloy 6AL4V is a health hazard because …

Answer 18

It is cancer causing - by checking the MSDS

Question 19

Copper / copper alloys corrosion characteristic

Answer 19

Greenish film (patina)

Question 20

Welding fluxes are highly ___

Answer 20

CORROSIVE

Question 21

Galvanizing process involves coating steel with ____

Answer 21

ZINC

Question 22

Intergranular corrosion is caused by _____

Answer 22

IMPROPER HEAT TREATMENT , located INSIDE the metal
CANT ALWAYS BE DETECTED BY SURFACE INDICATIONS , can be detected by ULTRASOUND or X-RAY

Question 23

Clean plastic surfaces by

Answer 23

Flush surfaces with COOL CLEAN WATER to dissolve salt deposits and remove loose dirt before using soapy water to prevent scratching

Question 24

Neutralize NICAD battery with ___
Neutralize LEAD acid battery with ___

Answer 24

BORIC ACID
BAKING SODA / sodium bicarbonate

Question 25

Corrosion removal by mechanical means you can use ___

Answer 25

ALUMINUM WOOL / ALUMINUM WIRE BRUSH
(do not use steel with aluminum or vice versa)

Question 26

Smoking rivets is a sign of ____

Answer 26

Fretting corrosion

Question 27

Control cables are made of ____ and if they show signs on outerwear of corrosion then you must ____

Answer 27

Carbon steel / corrosion resistant steel ; replace the entire cable

Question 28

Seaplanes and amphibians must be checked more frequently for

Answer 28

Corrosion due to moisture because of their operating environment

Question 29

ALODINE increases the ____ to ______

Answer 29

THE RESISTANCE TO CORROSION / means slowing down corrosion

Question 30

ALODINE leaves an ____film on metal for ________

Answer 30

OXIDE FILM on metal for sacrificial corrosion

Question 31

Galvanic corrosion occurs when

Answer 31

Dissimilar metals make contact with each other and cause corrosion

Question 32

Lavatories & Galleys are HIGHLY____ areas because

Answer 32

CORROSIVE - Human waste and food are corrosive
Areas must be inspected carefully

Question 33

In early stages of Intergranular corrosion the corrosion is ___

Answer 33

NOT EASILY VISIBLE

Question 34

Fretting corrosion results from ___

Answer 34

Tight fitting parts moving relative to another