Application of Carboxymethyl Chitosan-Benzaldehyde as Anticorrosion Agent on Steel

Table 3

The effect of concentration of CMC-benzaldehyde with and without the addition of starch on the dripping and coating methods to the corrosion current, corrosion rate, and inhibition efficiency.

Treatment	Concentration (g/60 mL of solvent)	Corrosion current (μA/cm^2)	Corrosion rate (mm/year)	Efficiency of inhibitor (%)
Negative control	-	506.89	5.8900	-
Dripping with CMC-benzaldehyde	1	234.97	2.7303	53.65
	3	157.88	1.8346	68.85
	5	142.21	1.6525	71.94
	7	131.13	1.5237	74.13
Dripping with CMC-benzaldehyde and starch	1	404.55	4.7008	20.19
	3	209.64	2.4360	58.64
	5	4.9576	0.0576	99.02
	7	2.2381	0.0260	99.56
Coating with CMC-benzaldehyde	1	388.48	4.5141	23.36
	3	365.21	4.2437	27.95
	5	79.701	0.9261	84.28
	7	14.661	0.1704	97.11
Coating with CMC-benzaldehyde and starch	1	353.53	4.1080	30.25
	3	298.71	3.4710	41.07
	5	2.5404	0.0295	99.50
	7	1.0203	0.0119	99.80