8 - Chloride Stress Corrosion Cracking (Cl-SCC)

Question 1

Cl-SCC - Surface initiated cracks caused by environmental cracking of 300 Series SS and some nickel base alloys under the combined action of,,,,,,

Answer 1

tensile stress, temperature and an aqueous chloride environment

Question 2

For Cl-SCC - The presence of dissolved oxygen increases ,,,,,, for cracking

Answer 2

propensity

Question 3

SCC usually occurs at pH values above ,,,,,,

Answer 3

2

Question 4

SCC tendency decreases toward the ,,,,,,

Answer 4

alkaline pH region

Question 5

Cl-SCC - Cracking usually occurs at metal temperatures above about ,,,,,

Answer 5

140oF

Question 6

Cl-SCC - has greatest susceptibility is at a nickel

content of ,,,,,

Answer 6

8% to 12%

Question 7

Alloys with nickel contents above ,,,, are highly resistant

Answer 7

35%

Question 8

Alloys with nickel contents above ,,,,, are nearly immune

Answer 8

45%

Question 9

Carbon steels, low alloy steels and 400 Series SS are not susceptible to ,,,,,,

Answer 9

Cl-SCC

Question 10

Cl-SCC - Metallography of cracked samples typically shows ,,,,,

Answer 10

branched transgranular cracks