Table 4: Potentiostatic parameters and corrosion rate (CR).

Solution and time of measurementPipe 𝐸 PR (ohms) 𝛽 𝑎 (mV/decade) 𝛽 𝑐 (mV/decade)CR (mm/year)

Static tap water after one year1−0.692854782500.136
2−0.695543592210.146
3−0.685754022440.136

Aerated tap water after one year1−0.472632301650.188
2−0.5151422992180.122
3−0.467542221640.195

Aerated solution of 3.5% NaCl after six months1−0.691 1061280.18
2−0.697 854290.152
3−0.687 959250.135