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 GC
2 )Rp1 2 ) CPE1
(Ω·cm2 )CPE2 W
(Ω−1 cm−2 S0.5 )
(%)
(Ω−1 cm−2
)
(Ω−1 cm−2
)
4 0 15.0 106 3.9 × 10−5 0.88 60.6 8.9 × 10−4 0.45 6.0 × 10−5 bk 0.1 17.7 105 6.9 × 10−5 0.82 81.9 8.4 × 10−4 0.46 5.3 × 10−5 10 0.5 17.4 175 7.1 × 10−5 0.83 56.1 7.2 × 10−4 0.46 3.4 × 10−5 28 1 23.2 200 2.6 × 10−5 0.93 15.7 4.6 × 10−4 0.48 2.8 × 10−4 28 2 16.6 247 4.2 × 10−5 0.88 62.9 5.6 × 10−4 0.48 1.4 × 10−4 46 7 0 16.7 5002 6.6 × 10−6 0.989 3.27 × 10−3 1.2 × 10−4 0.49 5.1 × 10−2 bk 0.1 15.2 6569 8.2 × 10−6 0.980 2.0 × 10−3 7.9 × 10−5 0.51 3.1 × 10−2 23 0.5 16.1 7871 7.4 × 10−6 0.980 4.9 × 10−3 3.9 × 10−5 0.55 5.4 × 10−2 36 1 16.0 13590 1.0 × 10−5 0.934 2.4 × 10−3 3.3 × 10−5 0.47 1.1 × 10−1 63 2 16.6 14660 6.2 × 10−6 0.980 3.0 × 10−3 2.5 × 10−5 0.20 1.2 × 10−1 65 10 0 15.8 6190 47.9 × 10−6 0.60 835.5 × 10−3 5.9 × 10−6 0.92 123.9 × 10−3 bk 0.1 15.0 13560 37.3 × 10−6 0.38 292.5 × 10−3 13.9 × 10−6 0.82 12.8 × 10−3 54 0.5 15.4 22540 35.8 × 10−6 0.32 15.6 × 10−3 13.6 × 10−6 0.91 1.3 × 10−3 72 1 19.6 27530 30.6 × 10−6 0.30 2.65 × 10−3 12.96 × 10−6 0.90 0.1 × 10−3 77 2 19.7 36750 29.0 × 10−6 0.32 2.2 × 10−3 11.6 × 10−6 0.90 0.2 × 10−3 83
GC = glycerol concentration.
