Chloride Stress Corrosion
(Corrosion Offshore, Produced Waters, De-Salination)
In the drop evaporation method, tensile specimens are increasingly
loaded, in 10% increments, until the yield stress is reached.
Simultaneously, a solution of 0.1M NaCl is dripped on to the specimen,
the timing such that the previous drop has just evaporated when the next
one hits. The test temperature was 170 ºC; the test is complete when
failure occurs or 500 hours elapses without failure (tests in
duplicate).
VISTAR® performs well in this test showing at least the same resistance
as CK3MCuN (254 SMo®) when loaded with twice the applied stress.
Figure 1 illustrates the corrosion
resistance of VISTAR® to high temperature crevice corrosion from
simulated seawater tests.
