Anticorrosive efficacy and adsorptive study of guar gum with mild steel in acidic medium

Journal of Analytical Science and Technology

Table 2 Corrosion parameters of guar gum at 313 K temperature in different acidic medium with mild steel at different immersion time periods

Medium	Inhibitor conc.	6 h			24 h			48 h			72 h
		Wt.loss	CR	IE%	Wt.loss	CR	IE%	Wt.loss	CR	IE%	Wt.loss	CR	IE%
		(gm)	(mm/yr)		(gm)	(mm/yr)		(gm)	(mm/yr)		(gm)	(mm/yr)
1N HCl	0	0.161	2.134	–	0.536	7.118	–	0.967	12.842	–	1.754	23.304	–
	250	0.052	0.693	67.52	0.103	1.3726	80.717	0.167	2.2245	82.679	0.339	4.5021	80.681
	500	0.047	0.621	70.9	0.101	1.345	81.105	0.140	1.8638	85.487	0.264	3.5061	84.955
	750	0.047	0.619	71	0.089	1.1784	83.445	0.129	1.7133	86.659	0.215	2.853	87.758
	1000	0.045	0.592	72.28	0.083	1.1031	84.502	0.117	1.5541	87.899	0.182	2.4245	89.6
1N H₂SO₄	0	0.243	32.26	–	0.841	111.78	–	2.023	268.75	–	2.724	361.84	–
	250	0.058	7.733	76.03	0.192	25.526	77.163	0.639	84.917	68.403	1.084	144.04	60.193
	500	0.054	7.203	77.67	0.176	23.327	79.131	0.531	70.582	73.737	0.966	128.33	64.534
	750	0.043	5.724	82.25	0.138	18.344	83.589	0.471	62.58	76.715	0.800	106.24	70.638
	1000	0.037	4.906	84.79	0.130	17.282	84.54	0.418	55.567	79.324	0.714	94.8	73.8
1N HNO₃	0	0.882	117.1	–	1.537	204.14	–	1.212	160.98	–	1.121	148.86	–
	250	0.305	40.53	62.73	0.405	53.748	71.63	0.929	123.36	38.454	0.729	96.826	31.651
	500	0.333	44.17	60.74	0.59	78.393	59.82	0.937	124.41	25.902	0.905	120.24	17.326
	750	0.399	53.06	50.9	0.771	102.49	48.526	0.875	116.24	21.663	0.918	121.92	15.733
	1000	0.427	56.7	48.6	0.818	108.68	44.468	0.823	109.33	19.805	0.943	125.25	13.253