Journal
CORROSION SCIENCE
Volume 51, Issue 2, Pages 409-414Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2008.11.010
Keywords
Mild steel; Neutral inhibition; EIS; SEM; Transition metal complexes
Funding
- NPC-RT
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Corrosion inhibition of some metal acetylacetonate complexes including Co(acac)(2), Cu(acac)(2), Mn(acac)(2) and Zn(acac)(2) was evaluated using electrochemical impedance spectroscopy (EIS) in 3.5% NaCl for mild steel. The results were compared to zinc potassium chromate (ZPC) solution in 3.5% NaCl. Corrosion inhibition of these metal complexes followed the order: ZPC > Co(acac)(2) > Zn(acac)(2) > Mn(acac)(2) while Cu(acac)(2) displayed corrosion catalytic activity. Solutions containing metal acetylacetonate complexes had an increase in pH compared to Blank and ZPC solutions, which indicated partial dissociation of ligand and metallic cations. However, after 24-h contact with the mild steel samples the solutions pH were dropped which implied decrease of the complex concentration in the test solutions. SEM images showed no detectable deposited film on the surface exposed Co(acac)(2) solution while EDX analysis revealed precipitation of a layer containing 4.14% Co. SEM-EDX results for samples immersed in Zn(acac)(2) and Mn(acac)(2) solution showed precipitation or Zn and Na components and Mn complex on the surface, respectively. (C) 2008 Elsevier Ltd. All rights reserved.
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