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International Scholarly Research Notices
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International Scholarly Research Notices
/
2012
/
Article
/
Tab 5
/
Research Article
Black Wattle Tannin As Steel Corrosion Inhibitor
Table 5
Polarization parameters for the corrosion of carbon steel immersed in 0.1 mol L
−1
Na
2
SO
4
solution (pH 2.5), in the presence and absence of tannin, for different periods.
𝑗
c
o
r
r
(
μ
A cm
−2
)
𝐸
c
o
r
r
(V)
𝑅
𝑝
(Ω cm
2
)
IE (%)
1 day
103.4
−0.65
202.76
55.7
1 day with tannin
25.90
−0.60
457.58
3 days
123.73
−0.68
76.863
62.0
3 days with tannin
25.93
−0.63
202.23
7 days
122.90
−0.68
68.152
68.7
7 days with tannin
29.20
−0.63
217.72