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

Table 3

Activation parameters for the corrosion of aluminum in 0.5 M phosphoric acid containing different concentrations of inhibitor CSE.

Conc. of inhibitor; (ppm)	𝐸𝑎; (kJ mol^−1)	Δ𝐻𝑎; (kJ mol^−1)	Δ𝑆𝑎; (J mol^−1 K^−1)
0.0	45.70	43.15	−56.64
100	23.40	20.79	−176.29
200	23.23	20.62	−177.91
300	18.29	14.82	−197.46
400	17.43	15.68	−196.30
500	8.69	6.08	−228.52