Table 3 Percentage corrosion inhibition efficiency and EIS parameters of varied concentrations of BLE extract for X52-steel in 1.0 M HCl at 298 K calculated by EIS method.

From: Utilizing birch leaf extract in pickling liquid as a sustainable source of corrosion inhibitor for pipeline steel

BLE (mg L−1)

Rp (ohm cm2)

CPE (Y0 × 106 (Scm−2 Sn2)

n

χ2

Cdl (µF cm−2)

ηR%

Blank

53. 7

85.8

0.754

1.43 × 10−3

527.3

-

25

84.3

74.2

0.877

1.94 × 10−3

467.2

36.2

50

234.6

55.2

0.886

2.03 × 10−3

332.6

77.1

100

295.7

35.6

0.891

1.61 × 10−3

203.5

81.8

200

345.8

25.8

0.823

1.09 × 10−3

145.3

84.4

300

799.2

23.5

0.811

2.15 × 10−3

128.4

93.2

400

855.8

9.6

0.893

1.20 × 10−3

60.6

93.7

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