University Chemistry ›› 2019, Vol. 34 ›› Issue (6): 33-37.doi: 10.3866/PKU.DXHX201810034

• Chemistry Laboratory • Previous Articles     Next Articles

Improvement in the Experiment of Corrosion of Carbon Steel in Ammonium Carbonate Solution

Yanfang DU*()   

  • Received:2018-10-31 Published:2018-12-06
  • Contact: Yanfang DU E-mail:yfdu@chem.ecnu.edu.cn
  • Supported by:
    华东师范大学设备处实验教学设备研制基金项目

Abstract:

The corrosion law of carbon steel under different experimental conditions was studied by linear sweep voltammetry and electrochemical impedance spectroscopy. The anodic process of carbon steel was dissolving, passivating and over passivating in ammonium carbonate solution. The mass transfer of the electrode at the initial phase was controlled by linear diffusion; with the increasing of solution temperature, the impedance spectrum was expressed as a single time constant. The diameter of reactance decreased gradually, the resistance became smaller and the corrosion rate of carbon steel increased. The greater the concentration of Cl-, the smaller the passivation area, the corrosion of carbon steel increased. With the addition of the thiourea corrosion inhibitor, the increasing of the diameter of the reactance, the resistance became larger, which was beneficial to the protection of carbon steel.

Key words: Carbon steel corrosion, Polarization curve, Corrosion inhibitor

MSC2000: 

  • G64