Study on the Influence of Pulse Current Cathodic Protection Parameters of Oil Well Casing

Table 2

Corrosion test time.

Estimation or prediction of the corrosion rate (mm/a)	Test time (h)	Replacement of solution or not
>1.0	24–72	No
1.0–0.1	72–168	No
0.1–0.01	168–336	Replacement once in about 7 days
<0.01	336–720	Replacement once in about 7 days
>1.0	24–72	No