In absence of corrosion and tensile stress environmental cracking will not occur.

• A. Environmental Cracking
• B. Pitting
• C. Galvanic Corrosion
• D. Uniform Corrosion

Answer: (A)

Environmental cracking happens only when a corrosive environment and tensile stress are present. The crack forms because the environment assists or enables crack growth under a tensile load, so if there’s no corrosion or no tensile stress, this type of cracking can’t occur. Other listed processes are different: pitting and uniform corrosion are corrosion phenomena that can happen without any tensile stress, and galvanic corrosion arises from electrochemical differences between metals in contact, not necessarily requiring a tensile load. Thus, the statement correctly identifies environmental cracking as the mechanism that requires both conditions to occur.