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International Journal of Corrosion
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International Journal of Corrosion
/
2013
/
Article
/
Tab 5
/
Research Article
Marjoram Extract as Corrosion Inhibitor for Dissolution of Zinc in 1.0 M HCl
Table 5
Activation parameters of the dissolution reaction of zinc in 1.0 M HCl in the absence and presence of 500 ppm of marjoram extract.
System
(kJ mol
−1
)
(kJ mol
−1
)
(J mol
−1
)
1.0 M HCl
9.83
16.12
−209.35
1.0 M HCl + 500 ppm inhibitor
13.18
23.20
−213.40