Abstract
In the present research, the synergism corrosion inhibition effects between the phytic acid (PA) molecules and zinc cations (Zn (II)) were investigated in 3.5 wt% NaCl solution through electrochemical measurements as well as surface (in micro/atomic scales) characterization methods. The efficiency and mechanism of inhibition were evaluated by the EIS and polarization techniques. The chelation between the PA and Zn (II) ions was studied by UV–vis spectroscopy. FT-IR, GIXRD, and FE-SEM/EDS analyses were conducted to identify the composition and structure of the precipitated film over the substrates. The hydrophobic/hydrophilic properties of the surface were assessed by the static contact angle (CA) measurements. The EIS studies proved that the PA-Zn (II) mixture acted as an efficient hybrid in the corrosion inhibition of the steel sample. The polarization plots indicated that the deposition of the PA-metal complexes led to the mixed-type corrosion inhibition mechanism. According to the electrochemical methods, the 250PA:750Zn sample resulted in the highest efficiency (95%) after 2 h. The FT-IR and EDS analyses verified the chelation and adsorption of the PA and Zn (II). The presence of the precipitated compounds on the sample was proved by FE-SEM images and GIXRD analysis.
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