Garcinia indica as an Environmentally Safe Corrosion Inhibitor for Aluminium in 0.5 M Phosphoric Acid

Table 2

Electrochemical impedance values of aluminum in 0.5 M phosphoric acid solution containing different concentrations of inhibitor (GIE) at different temperatures.

𝑇; (°C)	Conc.; (ppm)	𝑅𝑝; (Ω cm^2)	CPE; (𝜇F cm^−2)	𝜂; (%)
30	0	241.30	15	—
	100	411.38	14	41.34
	200	462.29	12	47.80
	300	493.50	11	51.10
	400	641.99	9	62.41
	500	712.02	8	66.11
35	0	195.90	26	—
	100	386.88	24	49.36
	200	431.81	22	54.63
	300	475.86	18	58.83
	400	578.29	17	66.12
	500	651.15	15	69.91
40	0	154.20	32	—
	100	335.58	30	54.05
	200	388.45	28	60.30
	300	425.10	25	63.73
	400	543.68	23	71.64
	500	611.02	20	74.76
45	0	102.40	46	—
	100	246.26	43	58.42
	200	291.27	39	64.84
	300	351.84	35	70.90
	400	384.30	33	73.35
	500	524.45	30	80.47
50	0	85.10	58	—
	100	245.64	46	65.40
	200	274.19	43	69.00
	300	335.25	37	74.65
	400	424.56	34	79.98
	500	579.87	31	85.34