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

Table 1

Corrosion parameters for mild steel in 1 N H₂SO₄ in the absence and presence of optimum concentration of variously substituted piperidin-4-ones (0.4 × 10⁻³ M) obtained from weight loss measurements at different temperatures.

Temperature (±1 K)	Inhibitor	Inhibitor efficiency (%)	Corrosion rate (mmpy)	Surface coverage (θ)
300	Blank	—	57.88	—
	(01)	51.76	18.25	0.5038
	(02)	84.62	08.90	0.8462
	(03)	79.62	11.80	0.7962
	(04)	47.31	30.50	0.4731
	(05)	51.15	28.27	0.5115
	(06)	80.16	09.25	0.8016
313	Blank	—	97.06	—
	(01)	33.49	64.56	0.3349
	(02)	57.57	41.18	0.5757
	(03)	49.54	48.98	0.4954
	(04)	28.21	69.68	0.2821
	(05)	30.05	67.90	0.3005
	(06)	52.40	44.65	0.5240
318	Blank	—	136.02	—
	(01)	30.93	93.94	0.3093
	(02)	48.28	70.35	0.4828
	(03)	44.52	75.47	0.4452
	(04)	26.19	100.40	0.2619
	(05)	31.59	93.05	0.3159
	(06)	46.73	73.18	0.4673
323	Blank	—	152.05	—
	(01)	19.91	121.77	0.1991
	(02)	33.82	100.62	0.3382
	(03)	26.65	111.53	0.2665
	(04)	14.93	129.34	0.1493
	(05)	20.50	120.88	0.2050
	(06)	30.15	105.84	0.3015