Cleaning And Corrosion Control

Question 1

What are the five common forms of corrosion

Answer 1

Fretting, the similar metal, intrgranular, Surface, and stress corrosion

Question 2

Name at least three factors that influence corrosion

Answer 2

Temperature, metal, Availability of electrolytes and dissimilar metals,Condition of protective coating

Question 3

What are the two general conditions that may cause stress corrosion cracking

Answer 3

Sustained tensile stress, and corrosive environment

Question 4

What is the cause of fretting corrosion

Answer 4

When two matting surfaces, Which are normally at rest with respect to each other, are subject to slight relative motion. It’s characterized by pitting of the surface and the generation of large quantities of fine debris between the services, identified as smoking rivets

Question 5

What is the principal cause of filiform corrosion

Answer 5

Surfaces that have not had a proper chemical treatment prior to painting

Question 6

Where is intergranular Corrosion most likely to occur

Answer 6

Typically along the green boundaries of extrude metal

Question 7

What is another name for dissimilar metal corrosion

Answer 7

Galvanic corrosion

Question 8

What are the factors which affect the type of corrosion

Answer 8

Varies with atmospheric conditions, size and shape of the metal, the type of metal, the corrosion producing agents present

Question 9

What methods are used for removing rust from Aircraft materials

Answer 9

use of abrasive paper and compounds, small power buffers and buffing compound, hand wire brushing and steel wool

Question 10

What is an acceptable method for removing surface corrosion from titanium

Answer 10

A stainless steel brush, aluminum oxide sandpaper, scotch bright, abrasive blasting using glass beads, hand polish using aluminum polish and soft cotton cloth

Question 11

What specific operations are part of corrosion preventative maintenance

Answer 11

Adequate cleaning,Periodic lubrication, detailed inspections, prompt corrosion treatment, touch up of damage paint, ceiling, use of protective covers, and Daly wipe down of expose critical areas

Question 12

Name the steps for corrosion removal

Answer 12

Clean and strip the corroded area, remove as much corrosion as possible, neutralize any residual material remaining in pits and crevices, restore protective surface films and paint

Question 13

What tools are approved for cleaning corroded anodized services

Answer 13

Fiber bristle brush, aluminum wool, and aluminum wire brush

Question 14

What is used to keep corrosion from forming on aluminum alloy

Answer 14

And oxide coding or aluminum cladding

Question 15

What can be used to repair the anodized surface of an aluminum alloy part

Answer 15

Aladin or other chemical conversion coatings

Question 16

What products should be used to clean an aircraft engine

Answer 16

Define spray of kerosene or solvent

Question 17

What is the preferred cleaning agent for plastic and rubber surfaces

Answer 17

Soap and water

Question 18

What should be used to clean Greece, fuel, or oil from Aircraft tires

Answer 18

Soap and water

Question 19

Why should only recommended cleaners be used on aircraft fabric and plastics

Answer 19

Their use causes less degeneration of the material

Question 20

Name five areas of an aircraft that are more prone to corrosion

Answer 20

Battery compartment’s, bilge areas, wheel wells and landing gear, flap recesses, laboratory, galley, and other areas where water might be entrapped

Question 21

What form of corrosion can be found in battery compartment

Answer 21

Direct chemical corrosion

Question 22

Why are piano type hinges prime locations for corrosion

Answer 22

Does similar metals and tend to trap contaminants between the pin and the hinge surface

Question 23

What is used to neutralize a lead acid battery electrolyte

Answer 23

Baking soda and water

Question 24

What is the difference between wet wash and dry wash Aircraft cleaning

Answer 24

Wet wash cleaning is used to remove oil, grease, carbon deposits and soil’s with the exception of corrosion and oxide films

Dry wash is used to remove film, dust, and small accumulations of dirt

Question 25

What are types of light duty and heavy duty Aircraft cleaning agents

Answer 25

Light duty cleaning agents are soap and synthetic detergent

Heavy duty cleaning agents are solvents and emulsion type cleaners

Question 26

What would you do before cleaning a windscreen

Answer 26

What the surface to prevent scratching

Question 27

What does filiform corrosion look like and where can it be found

Answer 27

Looks like thread or worm like puffiness of the paint surface. It occurs between the metals surface and the protective coating

Question 28

How is the inside of structural tubing prevented from corroding corroding

Answer 28

Hot linseed oil can be poured into the hole, then the access is drain