Materials and Composites Test #4

How are Aluminum alloys naturally protected from corrosion?

How might Steels be protected from corrosion?

What are the main causes of intergranualr corrosion?

Where would you possibly see Electro chemical attack?

Which type of corrosion usually appears as clumps of white powder or gray dots on surface of aluminum

How are tubular structures protected from corrosion?

What is the Ph of an acid verses an alkaline?

Define: A localized form of corrosion by which cavities or "holes" are produced in the material.

What are some of the hazards of corrosion?

Define: A form of oxygen concentration cell corrosion, Appears as a thread or wormlike lines/ puffiness under the skin

Why do we NOT use metal scrapers to remove sealant on Aluminum alloy structures? What do we use?

How do you neutralize these battery materials: Lead Acid and Nickel Cadmium?

Where would you possibly see Direct chemical attack?

In fuel cells, the corrosion concern is; corrosion due to microbe growth in the fuel tanks due to entrapped water

Define the following: Chemical used to coat bare metal and protect from corrosion

Does the Anode or Cathode give up electrons during Electro chemical attack?

Why are primers used on aircraft?

When accomplishing paint stripping and corrosion removal on the aircraft what safety precautions must be practiced?

Why is dope proofing of metal parts done before fabric covering?

If you eliminate any of the 4 factors required for electro-chemcial corrosion to occur, it will stop all together

Nickel and Titanium mated together would cause significant Dissimilar metals corrosion

Define: Water readily absorbs Oxygen from the air which attracts electrons from metal forming negative hydroxide ions

What steps may be necessary to accomplish a Detailed Visual Inspection for corrosion?

What precautions must be taken when protective covers are installed on aircraft?

What precautions must be taken when using corrosion protection chemicals- Alodine, Zinc Chromate Primer and Epoxy primer

Where are some locations corrosion commonly occurs?

What kinds of sandpaper can be used to remove corrosion on Steel and Titanium components?

What is another name for Galvanic corrosion?

What is used to protect newly exposed bare metals?

What are the hazard(s) of using alodine?

Define: Water/Vapours containing salt combines with oxygen in the atmosphere to produce the main source of corrosion

What if I cannot be sure the structure that my work card has asked me to inspect is free from corrosion?

List some factors that would affect the rate of corrosion in Dissimilar Metals corrosion?

What precautions may be taken to prevent corrosion on Magnesium structures?

Define the following: The deterioration of metal by chemical or electrochemical attack

D.V.I.-Detailed Visual Inspection and G.V.I.-General Visual Inspection: Where would I look for the definitions

The greater the distance apart on the galvanic series chart =The slower the anode will corrode

Define the following: Steel or iron parts treated with a coating of zinc to prevent rusting

What are safety concerns when using Corrosion Inhibiting compounds such as Dinitral and LSP3 which are mineral based?

What is the most chemically active metal used on aircraft?

Define: Corrosion damage induced when two dissimilar materials are coupled in a corrosive electrolyte.

The type of water the aircraft flies around be a factor in corrosion

Define: Sealing around windows, panels, antennas, pitot/static ports to prevent corrosion

Where is stress corrosion most commonly found?

What is the last step after removing corrosion on non painted Aluminum structure?

What are some of the least chemically active metals used on aircraft?

It's a poor practice to bring a full bottle of Alodine into the aircraft when making repairs

What do salts do in relation to corrosion?

What kinds of sandpaper can be used to remove corrosion on Aluminum and Magnesium components?

What is meant by the Galvanic Series?

Anodizing is more effective of Alodizing

What media in the bead blaster can be used to remove corrosion on Aluminum Alloy components?

Define: Localized attack along the grain boundaries, or immediately adjacent to grain boundaries

Once corrosion is removed, what tools can we use to measure the material remaining?

Define: Corrosive attack proceeding evenly over the entire surface area

Define the following: Applying a thin layer of aluminum oxide on and below surface

Define: The combined influence of tensile stress and a corrosive environment

What conditions must exist for Electro chemical corrosion to occur?

Explain a detailed inspection for corrosion on a ‘lapseam’?

Define: An attack resulting from a direct exposure of a bare surface to caustic liquid or gaseous agents

How long do you have once you remove the corrosion to protect the bare metal? (Steel)

Where is exfoliation corrosion most commonly found?

Define: The surface grains of the material are lifted by the coercive force of expanding oxidation products

Certain structural parts require a specific material thickness to have the proper strength and integrity

What NDT methods are effective in detecting corrosion?