Effect of Piperidin-4-ones on the Corrosion Inhibition of Mild Steel in 1 N H₂SO₄

Table 4

Inhibition efficiency and synergism parameter of variously substituted 2,6-diphenylpiperidin-4-ones (0.4 × 10⁻³ M) and KCl, KBr, and KI (1 × 10⁻³ M) systems in 1 N H₂SO₄ solution.

Inhibitors	Without KCl, KBr, and KI; IE (%)	KCl		KBr		KI
		IE (%)		IE (%)		IE (%)
(02)	51.76	61.08	1.14	72.38	1.47	87.44	2.69
(03)	38.03	53.97	1.24	66.10	1.54	82.84	2.53
(04)	22.27	36.40	1.12	50.20	1.31	71.12	1.88
(05)	32.26	45.19	1.14	58.16	1.36	76.99	2.06