Electrodeposition of BaCO₃ Coatings on Stainless Steel Substrates

Abstract

While cathodic deposits of BaCO 3 obtained from a dilute barium bicarbonate bath are unoriented, those obtained from EDTA-stabilized baths have a (200) orientation with respect to the substrate; thick coatings obtained at longer deposition times have a stronger orientation compared to thin coatings. The orienting influence is shown to be due to the combined effect of EDTA and the use of electrochemistry.

Shape Controlled Synthesis of Barium Carbonate Microclusters and Nanocrystallites using Natural Polysachharide – Gum Acacia

“…BaCO 3 has attracted a lot of recent research [27][28][29][30] due to its close relationship with aragonite, a prevalent and important biomineral, with many important applications in the ceramic and glass industries as well as its use as a precursor for magnetic ferrites and/or ferroelectric materials [31]. Barium carbonate (BaCO 3 ) is also used as a precursor for producing superconductor and ceramic materials [32] and other important applications in optical glass and electric condensers [33].…”

Electrodeposition of BaCO3 coatings on stainless steel substrates: Oriented growth in the presence of complexing agents

“…Electrodeposition yielded oriented coatings of BaCO 3 . 16 In later work on electrodeposition of isostructural SrCO 3 , 19 the EDTA bath yielded only unoriented coatings. Among other aminecarboxylates, only DTPA (diethylenetriaminepentaacetic acid) yielded an oriented coating of SrCO 3 .…”

“…These results are in keeping with our earlier observations of increased preferred orientation on increasing the thickness of the deposit. 16 The thickness of the deposit depends on the amount of charge passed, Q = current density × duration of deposition. So the Q was kept fixed at 300 mA min/cm 2 , in further experiments.…”

“…After deposition, the coating was rinsed with water and dried at 80°C. Prior to electrosynthesis, the working electrode was electrochemically polished as described elsewhere 16 .…”

“…14 On account of its ability to control growth kinetics, electrodeposition has emerged as a versatile synthetic technique for oxides, hydroxides, carbonates and sulphates. 15,16 Electrodeposition of metal carbonates has generated much interest, since the variable parameters in an electrodeposition directly affect the growth kinetics and properties of the phase that is synthesized. These parameters include deposition current/potential, deposition time, bath composition, pH, level of supersaturation and temperature.…”