Repassivation of 304 Stainless Steel Investigated With a Single Scratch Test.
Proc Nat'l Assoc of Corrosion Engineers Corrosion '92 Conference Nace PP 218/1-218/16 :218/1-218/16
Reformation of the passive film on 304 stainless steel was investigated with a scratch test developed by the U.S. Bureau of Mines. Regrowth of the passive film was measured by recording the current that resulted from forming the scratch. Charge consumed during the reformation of the film was compared to wear produced by the scratch. Measured current transients were deconvoluted using the width of the scratch as a function of time, resulting in the current from an incremental area of the scratch. The maximum current density and the charge density were linearly dependent on the area fraction of bare surface. The other parameters used in the model of the current transients did not change as the area fraction of bare surface changed. The results showed that the passive film remained adherent to the surface of the stainless steel during the rubbing mode of wear.
Proc. Nat'l Assoc. of Corrosion Engineers; Corrosion '92 Conference; Nace, PP. 218/1-218/16