Benzoic acid sodium salt

Catalog Number	ACM532321-1
CAS Number	532-32-1
Structure
Synonyms	Sobenate
IUPAC Name	Sodium;benzoate
Molecular Weight	144.1
Molecular Formula	C7H5O2Na
Canonical SMILES	C1=CC=C(C=C1)C(=O)[O-].[Na+]
InChI	InChI=1S/C7H6O2.Na/c8-7(9)6-4-2-1-3-5-6;/h1-5H,(H,8,9);/q;+1/p-1
InChI Key	WXMKPNITSTVMEF-UHFFFAOYSA-M
Melting Point	>300 °C
Solubility	Soluble in water
Appearance	Crystalline powder
Storage	Room temperature
Exact Mass	144.01872368
Hydrogen-Bond Acceptor Count	2
Hydrogen-Bond Donor Count	0
Monoisotopic Mass	144.01872368
Rotatable-Bond Count	1
Topological Polar Surface Area	40.1 Ų

Case Study

Corrosion Inhibition Effect of Sodium Benzoate on Nanocrystalline Pure Iron Metal

Afshari, Vahid, and Changiz Dehghanian. Journal of Solid State Electrochemistry 14 (2010): 1855-1861.

Nanocrystalline iron coatings were prepared on carbon steel surfaces using a citric acid bath pulsed electrodeposition method. The electrochemical behavior of the nanocrystalline iron coatings in a 30 mg/L NaCl + 70 mg/L Na₂SO₄ aqueous solution containing sodium benzoate was evaluated using potentiodynamic polarization curves and electrochemical impedance spectroscopy.
The figure shows the potentiodynamic polarization curves for different samples in the 30 mg/L NaCl + 70 mg/L Na₂SO₄ solution. It was observed that the corrosion current density significantly changed with variations in the microstructural morphology. These results indicate that the addition of sodium benzoate to the corrosion solution caused the polarization curves to show a higher corrosion potential. Additionally, as the grain size decreased, the corrosion rate also decreased. This behavior is likely due to more inhibitor adsorption and the formation of a passivation film on the metal surface. The passivation film blocks the charge transfer of the anodic reaction, significantly reducing the corrosion rate.

Electrochemical Polymerization of Polyaniline on Copper Using Sodium Benzoate

Gvozdenović, M. M., Jugović, B. Z., Stevanović, J. S., Grgur, B., Trišović, T. L., & Jugović, Z. S. (2011). Synthetic Metals, 161(13-14), 1313-1318.

Polyaniline (PANI) coatings were electrochemically polymerized on copper electrodes in an aqueous solution of 0.3 mol dm^-3 sodium benzoate and 0.2 mol dm^-3 aniline using constant current.
Electrochemical Polymerization of Polyaniline on Copper
Potentiodynamic anodic polarization curves were recorded for copper in the presence and absence of 0.2 mol dm^-3 aniline in 0.1-0.3 mol dm^-3 sodium benzoate, with a scan rate of 0.5 mV s^-1.
Using electrochemical polymerization under constant current conditions, copper-based polyaniline (PANI) films were prepared in an aqueous solution containing 0.3 mol dm^-3 sodium benzoate and 0.2 mol dm^-3 aniline. The current density ranged from 0.50 to 1.25 mA cm^-2.

Sodium Benzoate's Effect on Zinc Electrodeposition in Chloride Solutions

Mo, Yeqiang, et al. Journal of Applied Electrochemistry 41 (2011): 859-865.

Electrodeposited zinc coatings have been widely used for corrosion protection of metals such as carbon steel.
The influence of sodium benzoate on zinc electrodeposition on carbon steel electrodes in acidic chloride solutions was studied using cyclic voltammetry (CV), differential capacitance (DC), chronoamperometry (CA), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The nucleation process of zinc was analyzed using dimensionless graphical models.
The results showed that when the sodium benzoate concentration exceeds 0.03 M, it inhibits zinc electrodeposition. However, when the concentration is below 0.03 M, it accelerates the rate of zinc nucleation. At concentrations lower than 0.03 M, sodium benzoate adsorbs on the electrode surface, reducing the electrode/solution interface tension and facilitating zinc nucleation and growth. When the concentration exceeds 0.03 M, sodium benzoate forms a separating layer, hindering the formation and growth of zinc nuclei.

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