The effect of a new organic compounds 4-benzylidene-5-methyl-2-phenylpyrazolidin-3-one (BMP) and (4Z)-4-[(4-methoxyphenyl)methylidene]-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol- 3-one (MMDP) on the corrosion behavior of zinc by surface modification was investigated. Electrochemical study of the surface modified zinc specimens were carried out in 0.1 M HCl and 3.5% NaCl solution using galvanostatic polarization and linear polarization method. The surface modification of zinc was achieved by immersion in solutions of different concentration of BMP and MMDP for different immersion time. MMDP shows more protection efficiency than BMP. The corrosion protection could be explained by the formation of a protective organometallic layer on the zinc surface due to the chelation reaction between zinc and organic compound. Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FT-IR) were applied to study formation of the protective layer.
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