Crevice corrosion of nickel in 1N H2SO4 will be one of the systems that will be studied and presented. A schematic of the new and old methods of fabricating crevice formers and substrates. The new technique creates crevice formers with much less surface roughness, thereby creating a more uniform crevice height. The addition of electroplated nickel allows for thicker substrates which more closely resemble the electrochemical behavior of pure nickel and allow for longer corrosion behavior experiments. Notice the lack of attack deep into the crevice.
V is the corresponding potential for the peak current density.
The potential distribution inside the crevice as a function of distance. The peak potential, Epass, was taken from the fitted curve and used to determine xcrit. An xcrit of 1.33 mm corresponds to the boundary between the attack band and the start of the gentle slope towards the crevice tip from the experimental results in Figure 3. The current distribution inside the crevice as a function of distance. The model predicts a morphology of little or no attack in front and behind a band of severe attack, which has a steep slope towards the crevice mouth and a gentle slope towards the back of the crevice.