Experimental Investigation on Corrosion of Cast Iron Pipes

Table 4

Potentiostatic parameters and corrosion rate (CR).

Solution and time of measurement	Pipe	𝐸	PR (ohms)	𝛽𝑎 (mV/decade)	𝛽𝑐 (mV/decade)	CR (mm/year)
Static tap water after one year	1	−0.692	85	478	250	0.136
	2	−0.695	54	359	221	0.146
	3	−0.685	75	402	244	0.136
Aerated tap water after one year	1	−0.472	63	230	165	0.188
	2	−0.515	142	299	218	0.122
	3	−0.467	54	222	164	0.195
Aerated solution of 3.5% NaCl after six months	1	−0.691	10	61	28	0.18
	2	−0.697	8	54	29	0.152
	3	−0.687	9	59	25	0.135