Condition

I corr (A/µcm2)

Corrosion rate (mils/year)

Ecorr

(mV)

ßa

mv/decade

ßc

mv/decade

NS4

21.2

20.2

−642

130

160

NS4 + 0.4 MNa2S

31

30

−720

162

170

NS4 + 2 mNa2S

15.34

14.74

−667

151.5

200

NS4 + 4 mNa2S

15.5

15

−768

37.4

162.8

NS4 + 10 mNa2S

18.8

18.1

−627

180

175