Table 4. Electrochemical Parameters of the Al Anode in the Presence and Absence of Lignin Molecules in 4 M NaOH Solution.

concentration (ppm)	Rs (Ω cm2)	CPE1Y0 (μF cm–2)	frequency power	Rct1 (Ω cm2)	RL1 (Ω cm2)	L1 (H cm2)	Cfilm (F cm2)	Rfilm (Ω cm2)
0	2.505	7.127 × 10–5	0.9819	0.943	0.1293	0.0001748	0.06563	0.2529
100	2.458	1.787 × 10–5	1	1.174	0.1332	0.0001444	0.06721	0.3503
200	2.532	2.213 × 10–5	0.9776	1.347	0.1483	0.0001669	0.08075	0.3897
300	2.63	3.112 × 10–5	0.9281	1.749	0.2065	0.0002155	0.06735	0.4994
400	2.638	2.448 × 10–5	0.9443	1.953	0.2228	0.000321	0.06147	0.6019
500	2.563	1.82 × 10–5	0.9727	1.947	0.2091	0.0003672	0.06384	0.5686
600	4.15	2.72 × 10–5	0.9254	2.013	0.2912	0.0004678	0.05518	0.5686
800	4.472	3.367 × 10–5	0.9104	2.954	0.4026	0.0007165	0.07254	0.7679
1000	4.901	2.714 × 10–5	0.9279	2.736	0.4183	0.0006761	0.07334	0.7118