Table 1 Fitting results of XRR data obtained during exposure to 1 M NaCl solution at room temperature, at each step-wisely increased anodic potential

From: Redefining passivity breakdown of super duplex stainless steel by electrochemical operando synchrotron near surface X-ray analyses

Potential (mVAg/AgCl)

Alloy surface layer

Passive film

Thickness (nm)

Density (g/cm³)

Roughness (nm)

Thickness (nm)

Density (g/cm³)

Roughness (nm)

OCP

2.5

8.3

0.5

2.1

5.2

0.7

900

2.6

8.8

0.5

3.3

5.0

0.9

1000

2.8

9.1

0.5

3.7

5.0

0.9

1100

3.0

9.0

0.6

3.8

4.7

1.0

1200

3.4

9.1

0.6

4.0

4.3

1.2

1300

3.8

8.7

0.7

3.3

4.0

1.5

1400

Fringes in the spectrum became unclear

  1. The systematic error of the measurement was 2–5%. Using Genx program, the error bar was estimated to be <0.1 nm for the thickness and ≤0.01 g/cm3 for the density of the two surface layers, and ≤0.02 nm for the roughness
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