Module 8 Corrosion and Failure Analysis Objective Three

Question 1

corrosion test: labratory

Answer 1

exposure testing under simulated service conditions can be better controlled in laboratory testing

Question 2

Corrosion test: pilot-plant

Answer 2

tests are made in a small-scale plant, replicating large scale operation

Question 3

Corrosion test: In-service

Answer 3

tests are performed in a particular service. The test piece is exposed in a piece of industrial process equipment under actual service conditions

Question 4

Corrosion Test: Field

Answer 4

the test piece is exposed to the same type of atmosphere as that occurring where the material is to be used.

Question 5

Faraday’s law

Answer 5

mass(g)=(I(current amps) time(s)mol mass)/(95500*ions charge(n))

Question 6

corrosion rate (mils per year)

Answer 6

mpy=534W(weight loss in mg)/(D(density in g/cm^3)A(surface area in square inch)T(time in hours)

Question 7

Electrical Resistance (ER)

Answer 7

probe elements are a wire made of a similar material to that of the pipe/vessel being tested. the resistance in the wire is periodically measured and as the probe wire corrodes, the resistance will increase.