Citation: Mohammed A. Amin. Role of dissolved oxygen reduction in improvement inhibition performance of ascorbic acid during copper corrosion in 0.50 mol/L sulphuric acid[J]. Chinese Chemical Letters, ;2010, 21(3): 341-345. doi: 10.1016/j.cclet.2009.10.026 shu

Role of dissolved oxygen reduction in improvement inhibition performance of ascorbic acid during copper corrosion in 0.50 mol/L sulphuric acid

Mohammed A. Amin

Chemistry Department, Faculty of Science, Ain Shams University, 11566 Abbassia, Cairo, Egypt

Received Date: 3 July 2009

The kinetics of dissolved O₂ reduction and hydrogen evolution reactions on copper surface was studied in naturally aerated and air and O₂-saturated 0.50 mol/L H₂SO₄ solutions using polarization measurements combined with the rotating disc electrode (RDE). The Koutecky-Levich plot indicated that the dissolved O₂ reduction at the copper electrode was an apparent four-electron process. A correlation between the presence of dissolved O₂ and the formation of Cu₂O, confirmed from XRD, was discussed. Ascorbic acid (AA) was tested as a safe inhibitor for copper corrosion in H₂SO₄ solutions at 25℃. Measurements were carried out as a function of dissolved oxygen concentration using Tafel polarization measurements. The addition of AA slowed down the reduction reaction of dissolved O₂ more effectively than the anodic reaction. Dissolved O₂ was found to enhance the inhibition performance of AA. Adsorption via hydrogen bonding was considered.
- Copper,
- Sulphuric acid solutions,
- Corrosion inhibition,
- Ascorbic acid,
- RDE,
- O₂reduction
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