Abstract
In this current paper, we report the use of inexpensive, simple electrophoretic deposition (EPD) technique in developing polyaniline (PANI) aqueous colloidal suspension coating on copper (Cu) substrate. Polyaniline nanoparticle films were deposited electrophoretically on the surface of copper sheet electrode. A colloidal suspension with high stability was produced by a liquid polyaniline in the presence of formic acid and acetonitrile as electrolyte for the EPD process. The suspension of the PANI was characterized by measuring the zeta potential of the suspension using zeta-sizer analyser. The PANI coating was used as barrier for corrosion protection of the Cu sheet. Operating parameters such as operating time, applied voltage, and the concentration were used with deposition at the cathode. Characterization such as XRD, SEM, FT-IR, and UV–Vis was carried out, and the corrosion protection offered by the PANI on the Cu surface was examined using potentiodynamic (Tafel) polarization in 3.5% NaCl solution at room temperature. As a result, the optimum parameters for obtaining a homogenous coating on the Cu sheet were attained at the voltage of 15 V and deposition time of 180 s with 50 mg/mL PANI concentration. The attained results indicated inhibition efficiency for PANI deposit of 92.92% indicating protection against corrosion.
Highlights
Copper and its alloys have many properties that make them stand out, and such properties play vital role in it functions
The rationale behind utilizing these mixtures for the suspension is that there is solubility of formic acid in PANI in the emeraldine base form; as a result, the formic acid isolates the random chains of the PANI which has intertwined and breaks down the PANI in its chains level
This study focused on the formation of uniform PANI coatings on copper sheet as means of corrosion resistance
Summary
Copper and its alloys have many properties that make them stand out, and such properties play vital role in it functions. To the best of our knowledge, this simple method of colloidal suspension using polyaniline, formic acid, and acetonitrile on copper sheet for corrosion protection has not been reported. The performance of the PANI-EPD-coated copper sheet against corrosion was carried out by potentiodynamic (Tafel) polarization method using Gamry Potentiostat (reference 3000, Gamry instrument) in 3.5% NaCl solution.
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