Corrosion Midterm Quiz

Cleaning and stripping the corroded area

What is the first step in any complete corrosion treatment?

Electrical

Which method is NOT used for corrosion removal?

Mechanical

Hand sanding is classified under which method?

Clean grease, oil, and dirt

What must be done before applying a stripping compound?

Water-based, non-toxic

Which type of cleaning compound is encouraged by modern environmental standards?

P-D-680

Which solvent may be used where permitted for removing oil or grease?

Rubber gloves and goggles

What personal protective equipment must be worn when using paint stripper?

1/32 to 1/16 inch

What is the depth of stripper application recommended?

Bristle brush with paint remover

After stripper wrinkles the paint, what should be used to scrub the surface?

Nonmetallic scrapers

What should only be used to scrape persistent paint finishes?

Environmental laws

Stripped residue should be disposed of according to

Elliptical

What shape must all dish-outs be when fairing areas?

Stress corrosion cracking

In critical areas, pits must be blended out to avoid

Abrasive blasting

On non-critical structures, pits may remain after

20:1

Recommended blending ratio for depressions is

Rust (ferrous oxide)

The most familiar corrosion of ferrous metal is

A catalyst for more corrosion

Rust attracts moisture and acts as

Bolt heads and hold-down nuts

Rust is first seen on

Other ferrous components

Rust residue may contaminate

Dangerous

Rust on highly stressed steel is

Complete removal of corrosion

The most practical means of controlling steel corrosion is

Acceptable cleanup procedures

Abrasive papers, steel wool, and small power buffers are

Residual rust remains in pits

Why does steel often corrode again after abrasive cleaning

Nonwoven abrasive pads

Which tool has increased options for removing rust?

Steel base metal

Chemical rust removers must not etch

Isolation from nonferrous metals

Caustic rust removers require

They may be trapped and cause attack

Why are chemical inhibitors dangerous on installed parts?

Mild abrasives

Corrosion on highly stressed steel parts must be removed using

Causes hydrogen embrittlement

Why is chemical removal prohibited on highstrength steel?

Galvanic corrosion, Pitting and intergranular cracking

Aluminum alloys are subject to