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Heritage Science

Table 5 Electrochemical parameters of the fit of B72 and B72/TiO2 coatings before and after ageing

From: Exploration of coating alternatives for the protection of bare steel and brass in scientific-technical artefacts

Steel

Rs (Ω cm2)

CPEcoat-Y1 (S sα1  cm−2)

α1

Rcoat (Ω cm2)

CPEdl-Y2 (S sα2 cm−2)

α2

Rct (Ω cm2)

B72 (t = 0)

3.79E + 03

5.70E-10

0.96

1.08E + 08

1.29E-09

0.84

1.14E + 08

B72 (t = 1)

2.92E + 03

4.85E-10

0.97

3.49E + 06

4.89E-09

0.59

1.39E + 07

B72-TiO2 (t = 0)

2.37E + 03

5.21E-10

0.96

1.04E + 07

7.48E-09

0.39

1.22E + 08

B72-TiO2 (t = 1)

2.49E + 03

5.14E-10

0.96

3.21E + 03

2.34E-05

0.58

1.29E + 04

Brass

Rs (Ω cm2)

CPEcoat-Y1 (S sα1  cm−2)

α1

Rcoat (Ω cm2)

CPEdl-Y2 (S sα2 cm−2)

α2

Rct (Ω cm2)

B72 (t = 0)

3.82E + 03

5.08E-10

0.96

6.12E + 07

2.76E-09

0.42

9.29E + 08

B72 (t = 1)

2.68E + 03

6.41E-10

0.96

6.99E + 06

1.16E-08

0.50

8.32E + 07

B72-TiO2 (t = 0)

3.42E + 03

6.78E-10

0.96

6.32E + 06

6.44E-09

0.53

2.55E + 08

B72-TiO2 (t = 1)

2.71E + 03

7.28E-06

0.54

2.68E + 04

2.50E-05

0.96

1.36E + 04

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