FREE NACE Materials Selection & Design Questions and Answers

Question 1

What is the primary factor to consider when selecting materials for corrosive environments?

Accepted Answer

Environmental resistance and corrosion rate.

Answer

Cost of the material.

Answer

Aesthetic appearance of the material.

Answer

Availability of the material in the market.

Question 2

Which of the following materials is highly resistant to chloride-induced stress corrosion cracking (SCC)?

Accepted Answer

Duplex stainless steel (2205).

Answer

Carbon steel.

Answer

Austenitic stainless steel (304/316).

Answer

Aluminum.

Question 3

What design practice helps minimize crevice corrosion?

Accepted Answer

Avoiding sharp corners and ensuring proper drainage.

Answer

Using thicker materials.

Answer

Increasing the surface roughness.

Answer

Applying a single coat of paint.

Question 4

Why is galvanic corrosion a concern when joining dissimilar metals?

Accepted Answer

It accelerates the corrosion of the less noble metal.

Answer

It increases mechanical strength.

Answer

It improves thermal conductivity.

Answer

It reduces material costs.

Question 5

Which coating method is commonly used for corrosion protection of underground pipelines?

Accepted Answer

Fusion-bonded epoxy (FBE).

Answer

Anodizing.

Answer

Galvanizing.

Answer

Powder coating.

Question 6

What is the purpose of a corrosion allowance in material selection?

Accepted Answer

To compensate for predicted corrosion rates and extend service life.

Answer

To reduce manufacturing costs.

Answer

To improve the material's appearance.

Answer

To simplify inspection procedures.

Question 7

Which material property is critical for resisting erosion-corrosion in high-velocity fluid systems?

Accepted Answer

High hardness and impact resistance.

Answer

Electrical conductivity.

Answer

Thermal expansion coefficient.

Answer

Magnetic permeability.

Question 8

What is a common mitigation strategy for hydrogen embrittlement in high-strength steels?

Accepted Answer

Post-weld heat treatment (PWHT).

Answer

Increasing the carbon content.

Answer

Applying a thick paint coating.

Answer

Using smaller grain-sized materials.

Question 9

Which standard provides guidelines for material selection in sour (H2S-containing) environments?

Accepted Answer

NACE MR0175/ISO 15156.

Answer

ASTM A36.

Answer

ASME B31.3.

Answer

API 5L.