Corrosion Inhibition of Mild Steel in Sulphuric Acid Using Luffa Aegyptiaca Leaves Extract

doi:10.1007/s40195-014-0107-6

Abstract

Abstract:

The corrosion inhibition of mild steel (MS) in sulphuric acid using Luffa aegyptiaca (LA) leaves extract was investigated by weight loss studies, colorimetric measurements, potentiodynamic polarisation and electrochemical impedance spectroscopy. The adsorption of LA leaves extract was confirmed by Fourier transform infrared spectroscopy and optical profilometry. The inhibition efficiency increased with increasing concentration of the extract but decreased with rise in temperature and with the increase in acid strength. Furthermore, the inhibition efficiency synergistically increased on the addition of halide ions. Polarisation studies revealed that the LA extract acts as mixed- type inhibitor. Physical adsorption mechanism is proposed from the trend in inhibition efficiency with the change in temperature and from thermodynamic parameters. The adsorption of LA on MS surface obeys Langmuir adsorption isotherm and follows the kinetic thermodynamic model of El-Awady at all temperatures studied.

Key words: Mild, steel, Adsorption, Corrosion, Thermodynamic, properties, FTIR

Jyothi S., Ravichandran J.. Corrosion Inhibition of Mild Steel in Sulphuric Acid Using Luffa Aegyptiaca Leaves Extract[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(6): 969-980.

Figures/Tables 19

References 37

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ALA conc. (vol%)	1 h		3 h		5 h		7 h		9 h
ALA conc. (vol%)	CR (mpy)	IE	CR (mpy)	IE	CR (mpy)	IE	CR (mpy)	IE	CR (mpy)	IE
0	191.91	-	1,083.34	-	1,026.16	-	907.25	-	1,123.85	-
0.04	145.00	23.60	400.92	62.99	308.79	69.99	269.31	70.25	612.08	45.54
0.08	132.21	30.34	328.41	69.55	284.05	72.49	234.58	74.14	534.16	52.47
0.12	110.88	41.57	305.67	71.78	264.43	74.23	198.63	77.97	501.47	55.38
0.16	102.35	46.07	272.97	74.80	214.10	79.14	155.37	82.87	475.95	57.65
0.20	93.82	50.56	250.22	76.90	166.34	83.79	106.63	88.31	452.18	59.77
0.24	85.29	51.46	197.62	81.76	134.77	86.87	74.33	91.81	444.74	60.43
0.28	68.24	64.04	176.29	83.86	95.54	90.69	51.79	94.29	435.78	61.22
0.32	82.89	56.81	189.03	82.55	128.65	87.46	104.57	88.47	487.82	56.59
0.36	89.52	53.35	214.87	80.17	178.85	82.57	152.12	83.23	542.99	51.69

ALA conc. (vol%)	1 h		3 h		5 h		7 h		9 h
ALA conc. (vol%)	CR (mpy)	IE	CR (mpy)	IE	CR (mpy)	IE	CR (mpy)	IE	CR (mpy)	IE
0	191.91	-	1,083.34	-	1,026.16	-	907.25	-	1,123.85	-
0.04	145.00	23.60	400.92	62.99	308.79	69.99	269.31	70.25	612.08	45.54
0.08	132.21	30.34	328.41	69.55	284.05	72.49	234.58	74.14	534.16	52.47
0.12	110.88	41.57	305.67	71.78	264.43	74.23	198.63	77.97	501.47	55.38
0.16	102.35	46.07	272.97	74.80	214.10	79.14	155.37	82.87	475.95	57.65
0.20	93.82	50.56	250.22	76.90	166.34	83.79	106.63	88.31	452.18	59.77
0.24	85.29	51.46	197.62	81.76	134.77	86.87	74.33	91.81	444.74	60.43
0.28	68.24	64.04	176.29	83.86	95.54	90.69	51.79	94.29	435.78	61.22
0.32	82.89	56.81	189.03	82.55	128.65	87.46	104.57	88.47	487.82	56.59
0.36	89.52	53.35	214.87	80.17	178.85	82.57	152.12	83.23	542.99	51.69

ALA conc. (vol%)	1 h			3 h
ALA conc. (vol%)	Absorbance	Weight of iron (10^-3g)	IE (%)	Absorbance	Weight of iron (10^-3g)	IE (%)	Absorbance	Weight of iron (10^-3g)	IE (%)	Absorbance	Weight of iron (10^-3g)	IE (%)	Absorbance	Weight of iron (10^-3g)	IE (%)
0	0.19	5.51	-	0.52	13.68	-	0.62	16.16	-	0.76	19.59	-	0.77	19.8	-
0.04	0.09	3.03	45.0	0.155	4.64	66.1	0.16	4.72	70.8	0.16	4.72	75.9	0.45	12.01	39.34
0.08	0.06	2.32	57.9	0.135	4.14	69.7	0.14	4.24	73.8	0.14	4.24	78.4	0.39	10.52	46.87
0.12	0.055	2.20	60.1	0.12	3.75	72.6	0.11	3.54	78.1	0.12	3.75	80.9	0.31	8.48	57.17
0.16	0.050	2.02	63.4	0.10	3.23	76.4	0.09	3.03	81.3	0.08	2.74	86.0	0.25	7.02	64.55
0.20	0.045	1.82	67.0	0.07	2.43	82.2	0.07	2.43	85.0	0.06	2.32	88.2	0.21	5.71	71.16
0.24	0.040	1.62	70.6	0.06	2.32	83.0	0.05	2.02	87.5	0.04	1.62	91.7	0.19	5.51	72.17
0.28	0.035	1.41	74.4	0.045	1.82	86.7	0.035	1.41	91.3	0.025	1.01	94.8	0.17	4.91	75.20
0.32	0.052	2.28	62.8	0.11	4.28	63.8	0.10	4.56	75.8	0.09	4.61	75.9	0.29	7.92	60.00
0.36	0.080	2.85	49.3	0.14	4.54	50.3	0.165	4.65	51.8	0.015	4.70	56.2	0.415	11.11	43.89

ALA conc. (vol%)	1 h			3 h
ALA conc. (vol%)	Absorbance	Weight of iron (10^-3g)	IE (%)	Absorbance	Weight of iron (10^-3g)	IE (%)	Absorbance	Weight of iron (10^-3g)	IE (%)	Absorbance	Weight of iron (10^-3g)	IE (%)	Absorbance	Weight of iron (10^-3g)	IE (%)
0	0.19	5.51	-	0.52	13.68	-	0.62	16.16	-	0.76	19.59	-	0.77	19.8	-
0.04	0.09	3.03	45.0	0.155	4.64	66.1	0.16	4.72	70.8	0.16	4.72	75.9	0.45	12.01	39.34
0.08	0.06	2.32	57.9	0.135	4.14	69.7	0.14	4.24	73.8	0.14	4.24	78.4	0.39	10.52	46.87
0.12	0.055	2.20	60.1	0.12	3.75	72.6	0.11	3.54	78.1	0.12	3.75	80.9	0.31	8.48	57.17
0.16	0.050	2.02	63.4	0.10	3.23	76.4	0.09	3.03	81.3	0.08	2.74	86.0	0.25	7.02	64.55
0.20	0.045	1.82	67.0	0.07	2.43	82.2	0.07	2.43	85.0	0.06	2.32	88.2	0.21	5.71	71.16
0.24	0.040	1.62	70.6	0.06	2.32	83.0	0.05	2.02	87.5	0.04	1.62	91.7	0.19	5.51	72.17
0.28	0.035	1.41	74.4	0.045	1.82	86.7	0.035	1.41	91.3	0.025	1.01	94.8	0.17	4.91	75.20
0.32	0.052	2.28	62.8	0.11	4.28	63.8	0.10	4.56	75.8	0.09	4.61	75.9	0.29	7.92	60.00
0.36	0.080	2.85	49.3	0.14	4.54	50.3	0.165	4.65	51.8	0.015	4.70	56.2	0.415	11.11	43.89

ALA conc. (vol%)/0.001 (vol%) halide ion	IE
0.04	23.60
0.04 + KCl	34.09
0.04 + KBr	54.55
0.04 + KI	70.45
0.16	46.07
0.16 + KCl	56.82
0.16 + KBr	70.45
0.16 + KI	79.55
0.28	64.04
0.28 + KCl	75.00
0.28 + KBr	84.09
0.28 + KI	90.91