All electrochemical experiments were performed in a standard
one-compartment three-electrode cell. The reference electrode
was Ag/AgCl (3 M, KCl) and the counter electrode was a platinum
sheet with surface area of 0.36 cm2. In this study, all electrode
potential values were referred to this reference electrode. The
working electrode used in this study was carbon steel with the composition:
0.0561% C, 0.4498% Mn, 0.0103% P, 0.0036% S, 0.14085
Si and 99.3394% Fe. The surface of this electrode was carefully
polished with abrasive paper (1200 grid), degreased with 1/1
ethanol/acetone mixture, washed with distilled water and dried.
CHI 606C and CHI 660B model digital electrochemical analysers
were used for all electrochemical measurements. Zinc–cobalt plating
(CS/ZnCo) was carried out in a bath including by weight 42.75%
zinc sulphate (ZnSO4), 8.22% cobalt sulphate (CoSO4), 11.64%
sodium citrate (Na3C6H5O), 13.26% boric acid (H3BO3), 23.87%
ammonium chloride (NH4Cl) and 0.27% sodium sulphate (Na2SO4).
Meanwhile pH was approximately 5.0. The thickness of alloy plating was determined by estimation of the passing charge amount
applying 2 mA constant current. The thickness of ZnCo alloy plating
was estimated to be between approx. 2.14 m and 2.97 m. ZnCo
plating was accomplished under atmospheric condition without
stirring the solution. Polyaniline film was synthesized electrochemically
using cyclic voltammetry technique. Electrochemical
impedance measurements were obtained at measured open circuit
potential values applying 7 mV of amplitude in frequency
range from 105 Hz to 10−3 Hz. The anodic polarization curves were
recorded after 168 h of immersion time in corrosive test solution.
The scan rate was 4 mV s−1 and the measured open circuit potential
value was the initial potential for the scan. PANI film was analysed
with FT-IR spectral peaks (Perkin-Elmer spectrum 65 model
with universal attenuated total reflectance (ATR) attachment with
diamond).
All electrochemical experiments were performed in a standardone-compartment three-electrode cell. The reference electrodewas Ag/AgCl (3 M, KCl) and the counter electrode was a platinumsheet with surface area of 0.36 cm2. In this study, all electrodepotential values were referred to this reference electrode. Theworking electrode used in this study was carbon steel with the composition:0.0561% C, 0.4498% Mn, 0.0103% P, 0.0036% S, 0.14085Si and 99.3394% Fe. The surface of this electrode was carefullypolished with abrasive paper (1200 grid), degreased with 1/1ethanol/acetone mixture, washed with distilled water and dried.CHI 606C and CHI 660B model digital electrochemical analyserswere used for all electrochemical measurements. Zinc–cobalt plating(CS/ZnCo) was carried out in a bath including by weight 42.75%zinc sulphate (ZnSO4), 8.22% cobalt sulphate (CoSO4), 11.64%sodium citrate (Na3C6H5O), 13.26% boric acid (H3BO3), 23.87%ammonium chloride (NH4Cl) and 0.27% sodium sulphate (Na2SO4).Meanwhile pH was approximately 5.0. The thickness of alloy plating was determined by estimation of the passing charge amountapplying 2 mA constant current. The thickness of ZnCo alloy platingwas estimated to be between approx. 2.14 m and 2.97 m. ZnCoplating was accomplished under atmospheric condition withoutstirring the solution. Polyaniline film was synthesized electrochemicallyusing cyclic voltammetry technique. Electrochemicalimpedance measurements were obtained at measured open circuit
potential values applying 7 mV of amplitude in frequency
range from 105 Hz to 10−3 Hz. The anodic polarization curves were
recorded after 168 h of immersion time in corrosive test solution.
The scan rate was 4 mV s−1 and the measured open circuit potential
value was the initial potential for the scan. PANI film was analysed
with FT-IR spectral peaks (Perkin-Elmer spectrum 65 model
with universal attenuated total reflectance (ATR) attachment with
diamond).
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