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?

Solvent-based

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:

Painting without removal

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?

Aluminum alloys

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?

Caustic cleaners

Corrosion on highly stressed steel parts must be removed using:

Causes hydrogen embrittlement

Why is chemical removal prohibited on high￾strength steel?

Both Galvanic corrosion and Pitting and intergranular cracking

Aluminum alloys are subject to: