Exam 1: Corrosion and Materials

Which of these materials is susceptible to 885º F embrittlement?

Cracking can occur at low caustic levels if a concentrating mechanism is present. In such cases, caustic concentrations of ________ ppm are sufficient to cause cracking.

It is generally accepted that stresses approaching _________ are required for SCC to occur so that thermal stress relief is effective in preventing caustic SCC.

Low creep ductility is __________ severe in high tensile strength materials and welds.

Most brittle failures occur:

Oxygen and iron in the wash water injected into reactor effluent can lead to __________ corrosion and fouling.

_________ is a mechanical form of degradation that occurs when a component is exposed to cyclical stresses for an extended period, often resulting in sudden, unexpected failure.

Susceptibility to hydrogen stress cracking __________ with __________ hardness.

To prevent carburization, select alloys with a strong surface oxide or sulfide film former such as ________.

_________ is a selective corrosion mechanism in which one or more constituents of an alloy are preferentially attacked leaving a lower density often porous structure.

For 5Cr-0.5Mo, what is the threshold temperature for creep?

The most common method used for monitoring underground structures is measuring the structure to soil ______ using dedicated reference electrodes near the structure.

____________ is often found in piping and equipment that handles caustic, including H₂S and mercaptan removal units, as well as equipment that uses caustic for neutralization in sulfuric acid and HF acid units.

When caustic stress corrosion cracking is a concern, steam out of _________ carbon steel piping and equipment should be avoided.

SSC generally occurs below about ________.

When connected to a more anodic material, titanium may suffer severe __________.

Vessels constructed after December, 1987 are subject to the requirements of ________ of ASME Section VIII, Division 1.

The best method to inspect for SCC is ____.

Stainless steels with sigma can normally withstand normal operating stresses but upon cooling to temperatures below _______ may show a complete lack of fracture toughness as measured by a Charpy impact test.

Proper application of ________ will control but not eliminate microbes that cause MIC so that continued treatment is necessary.