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Dry and wet lab analysis on benzofused heterocyclic compounds as effective corrosion inhibitors for mild steel in acidic medium

Journal of Industrial and Engineering Chemistry, ISSN: 1226-086X, Vol: 40, Page: 106-117
2016
  • 59
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  • 32
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Metrics Details

  • Citations
    59
    • Citation Indexes
      59
  • Captures
    32

Article Description

The influence of two benzofused heterocyclic compounds, namely 2-phenylquinazolin-4(3 H )-one(PQO) and 2-phenyl-4 H -benzo[ d ]oxazin-4-one(POO) in controlling mild steel corrosion in 1 M H 2 SO 4 solution was investigated using gravimetric and electrochemical methods. The experimental results revealed that both the inhibitors inhibit corrosion and their inhibition efficiency follows the order PQO > POO. A mixed mode of inhibition from polarization and a charge transfer mechanism from impedance study in the absence and presence of inhibitors were found. The passive film formed on the mild steel surface was characterized using SEM-EDX. Quantum chemical parameters derived using DFT performed at B3LYP/6-31G(d, p) level were used to correlate the molecular structure.

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