Corrosion inhibition of carbon steel in chloride solutions by blends of calcium gluconate and sodium benzoate

Abstract

Inhibition efficiency of calcium gluconate, alone and in blends with sodium benzoate, on the corrosion of carbon steel in chloride solutions has been assessed by potentiodynamic polarization measurements and mass loss detection in the temperature range from 25 to 70 °C. Sodium benzoate efficient in hindering the general corrosion in chloride solutions can induce pitting of carbon steel. Along with decreasing the general corrosion calcium gluconate, an ecologically acceptable compound, eliminated the susceptibility to pitting formation. The inhibition of the anodic reaction by gluconate and benzoate, and the slowing down the cathodic reaction in solutions of calcium gluconate was confirmed.

Effect of amino acids containing sulfur on the corrosion of mild steel in phosphoric acid solutions containing Cl−, F− and Fe3+ ions: Behavior under polarization conditions

“…Among the non-toxic chemicals tested as efficient inhibitors are N-arylpyrroles for zinc [1] and Al [2] in acid solutions, imidazole derivatives, linear sodium heptanoate and some Schiff bases for copper [3][4][5], blends of calcium gluconate/sodium benzoate, SAHMT, fatty acid triazoles and rare earth cinnamate compounds for steel [6][7][8][9] and benzimidazole derivatives for iron in acid solution [10]. Amino acids have been successfully used as corrosion inhibitors in many practical applications [11][12][13][14][15][16][17][18][19][20].…”

Synergistic inhibition of carbon steel corrosion in seawater by cerium chloride and sodium gluconate

“…Zinc gluconate is used for common cold treatment and for better wound healing. The efficiency and the mechanism of the corrosion inhibition by gluconates, either as single compound or in a mixture, have been described in a number of recent studies [2,[38][39][40][41][42][43][44][45]. A successful inhibition of carbon steel was obtained in the seawater or solutions containing different chloride concentrations by gluconate [1,2,40,[45][46][47][48][49].…”

Corrosion inhibition of carbon steel in various water types by zinc gluconate

“…A number of recent studies have been carried out on the efficiency and the mechanism of the gluconate corrosion inhibition either as single compound or in a mixture [2,3,[7][8][9][10][11][12][13][14][15]. The efficiency of gluconate inhibition depends on inhibitor concentration, pH value and chemical composition of investigated solution, the nature of cations introduced in the solution as gluconate or already present in water and the state of the metal surface [11,16]. Gluconates are part of the successful commercial corrosion inhibitors and are recommended in mixture with water soluble polymeric dispersant, organophosphonate and silicate [17].…”

“…It is speculated that gluconate can repair the oxide film by adsorption on the exposed metal surface in weak spots of porous oxide film. Gluconates can be incorporated in the oxide film during its formation and/or gluconate are forming more or less soluble complexes that can be precipitated on the metal surface [11]. A successful inhibition of mild steel and zinc was obtained in the seawater and solutions containing different chloride concentrations by zinc gluconate [18,20,21].…”