Inhibition of Corrosion of Carbon Steel in Well Water by DL-Phenylalanine-Zn²⁺ System

Table 3

Corrosion rates (CRs) of carbon steel immersed in well water in the presence and absence of inhibitor system at various concentrations and the inhibition efficiencies (IEs) obtained by weight loss method.

DL-Phe ppm	Zn^2+ ppm	CR mm/y	IE %
0	0	0.0874	—
0	5	0.0743	15
50	5	0.0306	65
100	5	0.0183	79
150	5	0.00874	90
200	5	0.0139	84
250	5	0.0174	80

Inhibitor system: DL-phenylalanine-Zn²⁺ (5 ppm), immersion period: 7 days, pH = 8.