The corrosion inhibition of C38 steel in molar HCl by N,N-bis[2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyl]buthylamine (P1) and 5-{N,N-bis[2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyl] amino} pentanol (P2) has been investigated at 308 K using electrochemical and weight loss measurements. Measurements show that these compounds act as good inhibitors without changing the mechanism of the corrosion process. Moreover, the inhibiting efficiency increases with the increase in concentration of the studied inhibitors. Compound P2 showed better protection properties even at relatively higher temperatures when compared to P1. The associated activation corrosion and free adsorption energies have been determined. P1 and P2 are adsorbed on the C38 steel surface according to a Langmuir isotherm adsorption model.

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The synthesis of two new C,C-bipyrazoles ligands with a side-arm bearing a functionalised donor-group is reported. The complexation properties of these compounds towards bivalent metal ions (Hg 2+ , Cd 2+ , Pb 2+ , Cu 2+ , Zn 2+ ) and alkaline metal ions (Li + , Na + , K + ) was studied by a liquid-liquid extraction process and the extracted cation percentage was determined by atomic absorption measurements.