Table 1 Electrochemical parameters obtained from the polarization curves of AZ91 Mg alloy in 3.5 wt% NaCl solution without and with addition of 1 g/L seven TCM extracts at normal temperature.

From: Traditional Chinese medicine extracts as novel corrosion inhibitors for AZ91 magnesium alloy in saline environment

System

βa (mV/dec)

βc (mV/dec)

−Ecorr (mV )

Icorr (μA cm−2)

ηIcorr (%)

Blank

223 ± 12

196.9 ± 9.6

1565 ± 9

104.69 ± 3.22

–

ZORE

184 ± 9

170.7 ± 6.3

1551 ± 7

92.36 ± 2.31

11.77

RSLE

197.9 ± 3.2

224.1 ± 3.3

1536 ± 6

111.35 ± 1.97

− 6.36

RPE

152.2 ± 4.5

210.8 ± 4.6

1533 ± 3

124.37 ± 2.73

− 18.80

CCE

162.2 ± 3.9

231.7 ± 5.3

1525 ± 5

122.12 ± 2.24

− 16.65

GUE

143.8 ± 5.1

167 ± 6

1553 ± 4

55.34 ± 1.02

47.14

PDE

136.7 ± 3.3

151.9 ± 4.7

1540 ± 6

34.65 ± 0.77

66.90

TOE

175 ± 6

169.8 ± 5.8

1562 ± 5

43.75 ± 1.15

58.21

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