Abstract
Polyanisidine (POA) and polyanisidine-molybdate (POA−MoO42-) coatings have been successfully synthesized on steel grade СТ3 from aqueous solutions of oxalic acid by electrochemical method using cyclic voltammetry. The morphology and composition of these films were characterized by scanning electron microscopy (SEM) and energydispersive X-ray (EDAX) methods. It was proven that the introduction of MoO42- into the polyanisidine matrix raised the corrosion resistance of the POA coating and also improved its adhesion properties. The protective properties of steel grade CT3 with POA and POA-MoO42- films were studied using potentiodynamic polarization in 3.5% NaCl solution. The results showed that ions improve anti-corrosion properties of POA films.
Highlights
CT3 mild steel is the main structural material in many industrial installations, in particular, in the metal, oil and gas industries, as well as in wastewater treatment plants [1,2,3], due to a number of advantages including ease of manufacturing, availability, high strength and low cost [4, 5]
Due to its high solubility in an aqueous medium, the electrochemical method of synthesis of POA from aqueous solution eliminates the use of toxic organic solvents and no need for waste disposal
POA and POA − MoO24− films were synthesized on CT3 steel by the cyclic voltammetry method
Summary
CT3 mild steel is the main structural material in many industrial installations, in particular, in the metal, oil and gas industries, as well as in wastewater treatment plants [1,2,3], due to a number of advantages including ease of manufacturing, availability, high strength and low cost [4, 5]. The main disadvantage of most organic and inorganic corrosion inhibitors is their toxicity, which leads to adverse effects on the environment and human health. With a number of advantages including – low cost, availability and environmental friendliness. Due to its high solubility in an aqueous medium, the electrochemical method of synthesis of POA from aqueous solution eliminates the use of toxic organic solvents and no need for waste disposal. The authors of an investigation of the corrosion behavior of grade 304 steel during the electrochemical synthesis of POA coatings [12] found out that polyanisidine decreases the corrosion rate of steel as much as 15 times in a solution containing chloride ions
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