Background: Corrosion is a major problem in most industries making use of metals
across the world. The protection of metals and pipelines in the petroleum industry against
different forms of corrosion has been of interest to stakeholders for many years.
Objective: In this study, the effects of NaCl concentration, crevice scaling factor and immersion
time on the percentage area attacked and the maximum depth of crevice attack in type-
304 stainless steels were investigated.
Methods: The assembly and experimentation of crevice attack in type-304 stainless steels
were according to ASTM G-78. Furthermore, the open circuit potential of the system was
determined and numerical optimisation of the process factors was conducted.
Results: The open-circuit potential for creviced SS-304 revealed a greater susceptibility to
crevice corrosion at higher NaCl concentrations. It was observed that the percentage area attacked
and the maximum depth of attack increased with increasing NaCl concentration and
time. However, the higher scaling factors led to a lesser area and depth of attack. Numerical
optimisation revealed that the optimum value (minimum) of % area attacked and the maximum
depth of attack were 0.00005847% and 0.00984 mm at 2.43 wt% NaCl, 19.3 crevices
scaling factor and 15 days, respectively.
Conclusion: It can be concluded that by taking appropriate measures of maintenance and
avoidance of moist environment (supplying O and H2O), the crevice corrosion of SS-304 can