New bipyrazolic compounds were synthesised and tested as a corrosion inhibi
tors of Armco Iron in 1 M HCl medium using weight loss, electrochemical pol
arisation and impedance measurements. Comparison of results showed that 1,3
-bis(3,5-dimethylpyrazolyl) propane 3 (inh2) was the best inhibitor. The ma
ximum inhibition efficiency was reached 93% at 10(-3) M. Inh2 adsorbs on th
e iron surface according to the Langmuir isotherm model. The inhibition eff
iciency of inh2 increases with the rise in temperature in the range 308-338
K. The apparent activation energy for iron corrosion has been determined.
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