The Effect of Concentration of Lawsonia inermis as a Corrosion Inhibitor for Aluminum Alloy in Seawater

Table 4

Nyquist parameters for aluminum alloy in the absence and presence of Lawsonia inermis.

Concentration (ppm)	(V/dec)	(V/dec)	(V)	(A/cm^2)	Corr. rate (mm/year)	(%)
0	0.27	0.26	−0.72		1.10	—
200	0.09	0.12	−0.73		0.32	79
400	0.07	0.07	−0.74		0.28	89
600	0.07	0.12	−0.76		0.09	93
800	0.12	0.19	−0.73		0.40	89
1000	0.13	0.19	−0.74		0.18	81