Table 1. Parameters of Weight Loss after 1 h of Immersion at Different Concentrations of Lignin Molecules.

additive (ppm)	weight loss, ΔW (mg cm–2)	inhibition efficiency, ηW (%)
0	16.9
100	13.7	18.9
300	11.5	32.0
500	10.6	37.3
600	8	52.7
700	7.8	54.1
800	7.6	55.3
1000	6.6	61.2
1500	4.5	73.4