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Inhibition effect of
potassium dichromate on the corrosion protection of mild
steel reinforcement in concrete
C. A. Loto1,2*,
O. A. Omotosho2 and A. P. I. Popoola1
1Department
of Chemical and Metallurgical Engineering, Tshwane
University of Technology, Pretoria, South Africa.
2Department
of Mechanical Engineering, Covenant University, P.M.B. 1023,
Ota, Nigeria.
*Corresponding author. E-mail:
akinloto@gmail.com.
Accepted 11
April, 2011. |
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The inhibition of potassium dichromate on the corrosion
protection of mild steel embedded in concrete and partially
immersed in sulphuric acid and sodium chloride environments
was evaluated at ambient temperatures. The experiments were
performed using electrochemical potential monitoring method.
Varying quantities of the inhibitor was used. In the NaCl
test medium, the effectiveness of the inhibitor improved as
higher concentration was used. The best inhibition was
achieved in the reinforced concrete sample admixed with 9 g
potassium dichromate. Steel-reinforced concrete sample
admixed with 3 and 9 g potassium dichromate inhibitor had
the highest improvement in compressive strength. The
potassium dichromate inhibitor was most effective amongst
other inhibitor concentrations used when 7.5 g was admixed
with the sample in the H2SO4 medium.
The sulphuric acid medium had a deleterious effect on the
strength of concrete test specimens.
Key words: Corrosion, passive/active corrosion, inhibitors, sulphuric
acid, sodium chloride media. |
