Which set contains the two main types of environmental cracking?

Which set contains the two main types of environmental cracking?

• A. Caustic stress corrosion cracking and Caustic embrittlement
• B. Hydrogen-induced cracking and caustic embrittlement
• C. Pitting and intergranular corrosion
• D. Stress corrosion cracking and hydrogen embrittlement

Answer: (A)

Environmental cracking is cracking caused by chemical environments in service. In caustic-containing systems, the two primary cracking modes are caustic stress corrosion cracking, which happens when tensile stress and a caustic environment drive crack growth by a corrosion-assisted mechanism, and caustic embrittlement, where exposure to concentrated caustic reduces ductility and makes cracking possible even with little or no applied stress. These two modes together capture the main ways caustic environments can cause cracking in piping, which is why this set is the best choice. Other options involve hydrogen-related cracking or different forms of corrosion, which are not the two caustic-specific cracking modes emphasized here.

Environmental cracking is cracking caused by chemical environments in service. In caustic-containing systems, the two primary cracking modes are caustic stress corrosion cracking, which happens when tensile stress and a caustic environment drive crack growth by a corrosion-assisted mechanism, and caustic embrittlement, where exposure to concentrated caustic reduces ductility and makes cracking possible even with little or no applied stress. These two modes together capture the main ways caustic environments can cause cracking in piping, which is why this set is the best choice. Other options involve hydrogen-related cracking or different forms of corrosion, which are not the two caustic-specific cracking modes emphasized here.