Journal of Chemistry / 2014 / Article / Tab 2

Research Article

Inhibition Effect of Glycerol on the Corrosion of Copper in NaCl Solutions at Different pH Values

Table 2

Electrochemical impedance parameters obtained by fitting the Nyquist plots for Cu in aerated NaCl (0.5 M) with and without glycerol at three pH values.

0.5 M NaCl
(pH)
GC
(M)

(Ω cm2)
Rp1
(Ω cm2)
CPE1 (Ω·cm2)CPE2W
−1 cm−2 S0.5)
(%)
−1 cm−2 ) −1 cm−2 )

4015.01063.9 × 10−50.8860.68.9 × 10−40.456.0 × 10−5bk
0.117.71056.9 × 10−50.8281.98.4 × 10−40.465.3 × 10−510
0.517.41757.1 × 10−50.8356.17.2 × 10−40.463.4 × 10−528
123.22002.6 × 10−50.9315.74.6 × 10−40.482.8 × 10−428
216.62474.2 × 10−50.8862.95.6 × 10−40.481.4 × 10−446

7016.750026.6 × 10−60.9893.27 × 10−31.2 × 10−40.495.1 × 10−2bk
0.115.265698.2 × 10−60.9802.0 × 10−37.9 × 10−50.513.1 × 10−223
0.516.178717.4 × 10−60.9804.9 × 10−33.9 × 10−50.555.4 × 10−236
116.0135901.0 × 10−50.9342.4 × 10−33.3 × 10−50.471.1 × 10−163
216.6146606.2 × 10−60.9803.0 × 10−32.5 × 10−50.20 1.2 × 10−165

10015.8619047.9 × 10−60.60835.5 × 10−35.9 × 10−60.92123.9 × 10−3bk
0.115.01356037.3 × 10−60.38292.5 × 10−313.9 × 10−60.8212.8 × 10−354
0.515.42254035.8 × 10−60.3215.6 × 10−313.6 × 10−60.911.3 × 10−372
119.62753030.6 × 10−60.302.65 × 10−312.96 × 10−60.900.1 × 10−377
219.73675029.0 × 10−60.322.2 × 10−311.6 × 10−60.900.2 × 10−383

GC = glycerol concentration.

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