WL results for C-steel sheets in 1 M HCl solution without and with gradual concentrations of (H1, H2 and H3) at 30–45 °C.

Conc	Temp.	30 °C		35 °C		40 °C		45 °C
Comp.	Conc., (M)	θ	% IE	θ	% IE	θ	% IE	θ	% IE
H1	1 × 10−6	0.288	28.8	0.383	38.3	0.422	42.2	0.433	43.3
	2 × 10−6	0.385	38.5	0.442	44.2	0.461	46.1	0.482	48.2
	5 × 10−6	0.588	58.8	0.626	62.6	0.683	68.3	0.691	69.1
	10 × 10−6	0.659	65.9	0.664	66.4	0.695	69.5	0.732	73.2
	15 × 10−6	0.827	82.7	0.852	85.2	0.854	85.4	0.862	86.2
	20 × 10−6	0.934	93.4	0.930	93.0	0.932	93.2	0.944	94.4
H2	1 × 10−6	0.481	48.1	0.491	49.1	0.563	56.3	0.595	59.5
	2 × 10−6	0.565	56.5	0.584	58.4	0.581	58.1	0.602	60.2
	5 × 10−6	0.632	63.2	0.675	67.5	0.692	69.2	0.743	74.3
	10 × 10−6	0.684	68.4	0.724	72.4	0.731	73.1	0.746	74.6
	15 × 10−6	0.755	75.5	0.762	76.2	0.765	76.5	0.774	77.4
	20 × 10−6	0.876	87.6	0.903	90.3	0.908	90.8	0.917	91.7
H3	1 × 10−6	0.344	34.4	0.381	38.1	0.427	42.7	0.432	43.2
	2 × 10−6	0.552	55.2	0.573	57.3	0.571	57.1	0.582	58.2
	5 × 10−6	0.601	60.1	0.622	62.2	0.644	64.4	0.651	65.1
	10 × 10−6	0.643	64.3	0.645	64.5	0.663	66.3	0.685	68.5
	15 × 10−6	0.802	80.2	0.824	82.4	0.825	82.5	0.844	84.4
	20 × 10−6	0.955	95.5	0.953	95.3	0.952	95.2	0.965	96.5