Corrosion Inhibition Effect of Carbon Steel in Sea Water by L-Arginine-Zn²⁺ System

Table 3

Synergism parameter (𝑆_𝐼) for carbon steel immersed in sea water in the absence and presence of inhibitors.

L-Arginine (ppm)	𝜃1	𝜃2 (Zn^2+—25 ppm)	𝜃^′1+2	𝑆𝐼
50	0.26	0.64	0.69	0.8594
100	0.32	0.64	0.72	0.8743
150	0.38	0.64	0.79	0.88
200	0.40	0.64	0.85	1.44
250	0.44	0.64	0.91	1.76