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

Journal of Analytical Science and Technology

Table 1 Corrosion parameters of guar gum at 304 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	0.145	1.92	–	0.518	6.8867	–	0.957	12.71	–	1.727	22.944	–
	250	0.046	0.606	68.46	0.097	1.2881	81.295	0.145	1.9197	84.896	0.319	4.244	81.503
	500	0.040	0.536	72.07	0.094	1.252	81.819	0.134	1.7745	86.038	0.243	3.226	85.94
	750	0.036	0.484	74.82	0.079	1.0478	84.785	0.123	1.6283	87.189	0.208	2.7634	87.956
	1000	0.041	0.549	71.41	0.073	0.974	85.857	0.104	1.3843	89.108	0.163	2.1652	90.56
1N H₂SO₄	0	0.220	29.17	–	0.808	107.38	–	1.991	264.45	–	2.678	355.72	–
	250	0.048	6.409	78.03	0.165	21.954	79.555	0.509	67.56	74.453	0.945	125.59	64.695
	500	0.045	5.924	79.69	0.141	18.724	82.563	0.458	60.91	76.967	0.854	113.47	68.101
	750	0.033	4.415	84.86	0.120	15.971	85.127	0.372	49.432	81.307	0.670	88.943	74.996
	1000	0.030	4.024	86.21	0.102	13.516	87.41	0.324	42.979	83.747	0.496	65.859	81.485
1N HNO₃	0	0.882	117.1	–	1.537	204.14	–	1.212	160.98	–	1.121	148.86	–
	250	0.305	40.53	65.4	0.405	53.748	73.67	0.720	95.64	40.588	0.729	96.826	34.954
	500	0.333	44.17	62.29	0.59	78.393	61.6	0.875	116.24	27.789	0.905	120.24	19.224
	750	0.399	53.06	54.7	0.771	102.49	49.8	0.929	123.36	23.368	0.918	121.92	18.099
	1000	0.427	56.7	51.6	0.818	108.68	46.76	0.937	124.41	22.714	0.943	125.25	15.858