Acta Phys. -Chim. Sin. ›› 2000, Vol. 16 ›› Issue (09): 860-864.doi: 10.3866/PKU.WHXB20000919

• Note • Previous Articles    

Study of Surface Layer Structure and Corrosion Resistance on Octadecylamine-treated lron

Ge Hong-Hua, Liao Qiang-Qiang, Zhou Guo-Ding   

  1. Electrochemical Research Group,Shanghai Institute of Electric Power,Shanghai 200090
  • Received:1999-11-08 Revised:2000-04-20 Published:2000-09-15
  • Contact: Zhou Guo-Ding

Abstract:

The anti- corrosion performance of iron is greatly improved after octadecylamine (ODA) treatment. It is assumed from AES that the structure of surface layer of samples treated with ODA is as follows:
Lower ODA concentration: iron | iron oxide | ODA layer with iron oxide
Higher ODA concentration: iron | iron oxide | ODA layer with iron oxide | pure ODA layer
It is shown from infrared specular reflection that the surface layer of iron treated with higher ODA concentration reflects ν (CH) absorption peak corresponding to pure ODA layer. Every ν (CH) absorption peak shows opposite absorption phenomenon because of reflection from the iron oxide, which is under the pure ODA layer. Photoelectrochemical study exhibits that ODA treatment leads to the changes in physical structure of iron oxide layer.
ODA treatment was successfully applied to lay- up protection in power plant.

Key words: Octadecylamine, AC impedance, AES, Infrared specular reflection, Photoelectrochemistry