2026-10-07T05:52:59Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33847309 2026-09-17T10:22:08Z category_25135 category_25234 category_25237 category_25228 category_25231 item_type_3 month_year_09_2026

<b>Metal Coordination Effects on Dithiocarbamate Adsorption and Corrosion Protection of Mild Steel in Hydrochloric Acid</b> IBUKUN SHOTONWA (23591683) EMMANUEL AKANDE (24999604) RILIWAN KAREEM (25011983) MOLAYO AGUNBIADE (25012039) ABISOLA AKINWUYI (25012070) ABIMBOLA AFOLABI (25012099) MARTIN AGOSU (25012100) BABATUNDE DAWODU (25012564) KENECHUKWU OKWONKWO (25012584) DAVID AYENI (25012613) Transition metal chemistry Electrochemistry Molecular imaging (incl. electron microscopy and neutron diffraction) Chemical thermodynamics and energetics Colloid and surface chemistry dithiocarbamate complexes Corrosion inhibition Electrochemical impedance spectroscopy Adsorption thermodynamics Structure-property relationship Interfacial film formation <p dir="ltr">Although dithiocarbamates are effective corrosion inhibitors in acidic media, the influence of transition-metal coordination on their adsorption behaviour and inhibition mechanism remains incompletely understood. Sodium <i>N</i>-methyl-<i>N</i>-phenyldithiocarbamate and its Mn(II), Fe(III), Co(II), Ni(II), and Zn(II) complexes were assessed for mild-steel corrosion protection in 1.0 M HCl using potentiodynamic polarization, electrochemical impedance spectroscopy, adsorption isotherms, SEM, and XRF. All compounds exhibited concentration-dependent inhibition through spontaneous adsorption and behaved as mixed-type inhibitors with a pronounced anodic tendency. Metal coordination strengthened adsorption and favoured formation of compact interfacial films, as reflected by reduced corrosion current densities, increased charge-transfer resistance, and enhanced inhibition compared with the free ligand. Langmuir and Temkin models supported spontaneous adsorption involving both physisorption and chemisorption, while SEM and XRF provided morphological and compositional evidence of inhibitor-derived surface films. Co(II) and Ni(II) complexes provided the strongest adsorption and greatest corrosion resistance, whereas Mn(II) produced a more hydrated, less compact interfacial film. These findings demonstrate that transition-metal coordination governs adsorption, interfacial film characteristics, and electrochemical performance, providing structure–performance relationships for the rational design of advanced dithiocarbamate corrosion inhibitors.</p> 2026-09-17T10:22:08Z Dataset Dataset 10.6084/m9.figshare.33847309.v1 https://figshare.com/articles/dataset/_b_Metal_Coordination_Effects_on_Dithiocarbamate_Adsorption_and_Corrosion_Protection_of_Mild_Steel_in_Hydrochloric_Acid_b_/33847309 CC BY 4.0