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Citation: LI Dang-Guo, FENG Yao-Rong, BAI Zhen-Quan, ZHENG Mao-Sheng. Photo-electrochemical Characteristics of Passive Film Formed on N80 Tubular Steel[J]. Chinese Journal of Applied Chemistry, ;2007, 24(6): 688-692. shu

Photo-electrochemical Characteristics of Passive Film Formed on N80 Tubular Steel

1.
a School of Material Science and Engineering, Xi'an Jiaotong University, Xi'an 710049;
2.
b Tubular Goods Research Center of CNPC, Xi'an 710065

Corresponding author: LI Dang-Guo,
Received Date: 7 July 2006
Available Online: 26 September 2006

The semi-conductive properties of the passive film formed on N80 tube steel in 0.5 mol/L NaHCO₃ solution were investigated via capacitance measurement.Based on Mott-Schottky equation,the factors,such as measuring frequency,formation potential and Cl^- concentration,which affect the semi-conductive performance of the passive films,were analyzed.The results show that the passive film exhibited n-type semi-conductive character.The donor density of the passive film decreased with the increase of the measurement frequency,the formation potential,and Cl^- concentration.The photo-electrochemical experiments revealed that the photo-current increased with the increase of the formation potential and the formation time,which was attributed to the increasing mobility of the photo-generated holes or electrons.
- capacitance measurement,
- photocurrent measurement,
- passive film,
- semi-conductive property,
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