Exam 1: Corrosion and Materials

Amine corrosion depends on the design, operating practices, the type of amine, amine concentration, temperature and _________.

Naphthenic acid is _____ by catalytic reactions in downstream hydro processing and FCC units.

Higher __________ containing alloys are used for improved resistance to naphthenic acid corrosion.

Corrosion by HF (Hydrofluoric) acid can result in high rates of general or localized corrosion and may be accompanied by hydrogen cracking, blistering and ________.

Which of the following materials is susceptible to carburization?

Sulfur and chlorine species in fuel will form sulfur dioxide, sulfur trioxide and hydrogen chloride within the combustion products. At low enough temperatures, these gases and the water vapor in the flue gas will condense to form _________ acid.

The more noble material, called the ________, is protected by sacrificial corrosion of the more active material, called the ________. The more active metal corrodes at a higher rate than it would if it were not connected to the more noble metal.

Where is PASCC normally located?

With sulfidation, the presence of oxygen ________ corrosion

Carbon steel is susceptible to SCC when used in ___________ service.

The sudden rapid fracture under stress (residual or applied) where the material exhibits little or no evidence of ductility or plastic deformation is called _________.

Sulfidation is also known as ____________.

Nitriding layers are magnetic. Therefore, _________ should be checked for magnetism as an initial screening for nitriding.

Amine cracking is a form of ________ stress corrosion cracking.

Corrosion from oxygen in boiler feed water usually creates:

Temper embrittlement can be identified by a(n) shift in the ductile-to-brittle transition temperature measured in a Charpy impact test.

Naphthenic acid corrosion is a form of high temperature corrosion that occurs primarily in crude and vacuum units and downstream units that process certain fractions that contain naphthenic acid. Which of the following materials is susceptible to naphthenic acid corrosion?

__________ is a form of cracking that results when certain molten metals come in contact with specific alloys. Cracking can be very sudden and brittle in nature.

In vessels and piping, creep cracking can occur where high metal temperatures and _________ occur together.

Soil to Air interface areas are usually more susceptible to corrosion than the rest of the structure because of ___________ and __________ availability.