Ca. Odegard et A. Bronson, TRANSIENT CURRENT RESPONSE OF IRON-NICKEL-CHROMIUM ALLOY ROTATING CYLINDRICAL ELECTRODES SCRIBED WITH A DROPPED STYLUS, Corrosion, 53(10), 1997, pp. 800-807
The scribing technique was used to investigate dissolution and repassi
vation kinetics of three iron-nickel-chromium (Fe-Ni-Cr) electrodes im
mersed in a 0.01 M potassium chloride (KCl) + 0.01 M sulfuric acid (H2
SO4) electrolyte. The study related the extent of surface deformation
with the electrochemical response, as a result of a Vickers diamond im
pacting a rotating cylindrical electrode (RCE). The transient current
response and transient impact force (F-imp) of the stylus were measure
d simultaneously. For a given alloy, the scratch current density (i(s)
) was observed to remain unchanged with respect to F-imp of the stylus
from 44 N to 432 N. Activation charge density (q(act)) was observed t
o remain constant with F-imp, whereas the repassivation charge density
(q(rep)) increased with increasing F-imp. Surface deformation of the
alloys was discussed according to the principles of microindentation o
f alloys, which showed that electrochemical responses for the alloys c
orresponded with the plastically deformed zone associated with the scr
atch Alloy composition affected I-s q(act), and q(rep) for the F-imp v
alues measured.