article · ChemistrySelect
A mixed-metal orthophosphate compound designated as FA59, containing barium, niobium, and aluminium, was synthesised using a standard solid-state technique to evaluate its ability to protect mild steel from acidic degradation. Tested in a 1.0 M hydrochloric acid solution, the compound demonstrated strong protective capabilities, reaching an inhibition efficiency of 96.3 percent at a concentration of 400 parts per million. Electrochemical testing showed that the compound acts as a mixed-type inhibitor, markedly lowering the corrosion current density while enhancing charge-transfer resistance. Thermodynamic assessments confirmed that the substance attaches spontaneously to the steel via physical adsorption following a Langmuir model. Surface characterisation verified the creation of a dense, protective barrier layer rich in barium, niobium, aluminium, and phosphorus across the metal surface, indicating strong potential as an eco-friendly inorganic corrosion inhibitor.
Mild steel is widely deployed across industrial infrastructure but suffers severe degradation when exposed to harsh acidic environments. Developing efficient, environmentally benign inorganic inhibitors provides an alternative to hazardous compounds. This work demonstrates a high-performance chemical alternative capable of forming a protective surface barrier, potentially reducing maintenance costs and prolonging the operating lifespan of industrial steel assets.
This compound could enable high-efficiency corrosion protection additives for mild steel equipment operating in acidic processing environments, serving chemical handling and steel processing sectors. Based strictly on the abstract, the technology is at an early laboratory stage, having demonstrated electrochemical efficacy and film formation in bench-scale hydrochloric acid tests. Scaling the solid-state synthesis and testing performance in realistic industrial conditions are necessary subsequent steps.
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ABSTRACT The mixed‐metal orthophosphate BaNb 0 . 5 Al 0 . 5 (PO 4 ) 2 (FA59) was synthesized by a conventional solid‐state method and evaluated as a corrosion inhibitor for mild steel in 1.0 M HCl solution. The inhibition performance was investigated using potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), thermodynamic analysis, adsorption isotherms, and SEM/EDS surface characterization. FA59 exhibited excellent corrosion inhibition efficiency, reaching 96.3% at 400 ppm . EIS results showed a significant increase in charge‐transfer resistance and a decrease in double‐layer capacitance, while polarization measurements revealed a substantial reduction in corrosion current density, indicating that FA59 acts as a mixed‐type inhibitor . Thermodynamic analysis demonstrated an increase in the activation energy of the corrosion process in the presence of FA59. Adsorption followed the Langmuir isotherm (R 2 = 0.9996), with a Gibbs free energy of adsorption of −17.7 kJ mol − 1 , indicating spontaneous physisorption. SEM/EDS observations confirmed the formation of a compact protective film enriched with Ba, Nb, Al, and P species on the steel surface. These findings demonstrate that FA59 is a highly efficient and environmentally friendly inorganic corrosion inhibitor with promising potential for protecting mild steel in acidic environments.
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DOI: 10.1002/slct.74376
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