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7 Nano-Mechanical Properties of Solid Surfaces Obtained …
600
400
200
0
Load,
L / µN
120
100
80
60
40
20
0
Depth, h / nm
pH 8.4 borate solution
0.25 V (SHE)
Fe (100)
Fe (110)
Fig. 7.19 Averaged load-depth curves of the Fe (100) and (110) surfaces passivated at 0.25 V
(SHE) in pH 8.4 borate solution [24]. The load-depth curves measured twenty times at a maximum
load of L max = 100–500 µN for each loading and unloading time of 5 s were averaged because of
fluctuation in each load-depth curve. Reprinted from [24], Copyright 2001, with permission from
Elsevier
Fig. 7.20 Values of hardness H for the passive Fe (100) and Fe (110) surfaces determined from the
averaged load-depth curves at L max = 400 µN as a function of applied potential [24]. The dashed
line represents the linear relationship between thickness of passive film d f and potential E[54].
The square marks ( and ) represent the values of H = 3.75 and 3.62 GPa determined from the
averaged load-depth curves at L max = 400 µN, respectively, for the Fe (100) and Fe (110) surfaces
passivated at 0.25 V (SHE) in pH 8.4 borate solution after the chromate treatment. Reprinted from
[24], Copyright 2001, with permission from Elsevier