Abstract

NEZA, Ezekiel; AYOOLA, Ayodeji; BABALOLA, Rasheed  and  DURODOLA, Bamidele. Adsorption of Calcium Particles on A36 Mild Steel and its Thermodynamic Parameters. Port. Electrochim. Acta [online]. 2024, vol.42, n.2, pp.93-100.  Epub Jan 31, 2024. ISSN 0872-1904.  https://doi.org/10.4152/pea.2024420201.

Adsorption behavior of Ca particles obtained from SS, PS and ES calcination, as well as its Td parameters, during A36 MS coating via phosphating process, was investigated. A36 MS coupons surfaces were coated with phosphates and varied C of Ca particles (from 1 to 2.5 g/dm3), at a T of 60 and 80 ºC. Ca particles (as inhibitor) adsorption onto the MS surface obeyed Freundlich’s isotherm, with R2 values around 1. Kads and Td parameters, such as ∆G, ΔH and ΔS, were also determined. A36 MS coated with Ca particles obtained from calcined SS gave the best A capacity, as revealed in terms of Kads, ∆G and ∆S values. Higher Kads was obtained when T increased from 60 to 80 ºC. Also, Td parameters results revealed that Ca particles adsorption mechanism on MS was a more spontaneous process, at an increased T of 80 ºC.

Keywords : adsorption; Ca particles; corrosion; MS; Td.

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