Table 1 Polarization parameters for copper in 1.0 M HCl solution in the absence and presence of AFM extract at 298 K.

From: Thermodynamic, chemical, and electrochemical studies of Aloe ferox Mill extract as a naturally developing copper corrosion inhibitor in HCl solution

AFM extract (mg L–1)

 − Ecorr. mV (SCE)

jcorr. μA cm–2

βa (mV dec−1)

 − βc (mV dec−1)

ηj%

Blank

114 ± 2.6

28.7 ± 1.2

67

178

–

50

125 ± 2.7

20.5 ± 1.1

66

164

28.5

100

139 ± 3.1

11.4 ± 0.9

73

156

60.2

150

151 ± 3.2

6.3 ± 0.6

78

177

78.0

200

160 ± 3.8

4.6 ± 0.3

83

152

83.9

250

182 ± 3.6

1.9 ± 0.2

88

134

93.3

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