Effect of Hydrogen on Electronic Properties of Passive Film on Pure Iron

J Chin Soc Corr Pro

2000, Vol. 20

Issue (2): 74-80 DOI:

Research Report

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Effect of Hydrogen on Electronic Properties of Passive Film on Pure Iron

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北京科技大学材料物理系

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Abstract Pure iron membranes were pre-charged with hydrogen at various current densities.Effect of hydrogen on the film formation process on iron was studied by electrochemical methods. It showed that charged hydrogen delays the film formation and enhances the dissolution rate at passive state. After hydrogen injection and film formation at different passivation potentials, the AC impedance of the passive film has been measured. The results revealed that the capacitance and adulterated concentration of the film is increased, but the flat band potential is decreased by intrinsic hydrogen. Photoelectrochemical test indicated that hydrogen does not change the semiconductor types of the film, but enhances the photocurrent and reduces forbidden band gap. The results are discussed in relation to semiconductor model, and it was found that hydrogen influences the electronic properties mainly through changing the composition of passive film.

Key words: pure iron sulfuric acid photoelectric chemistry impendance

Received: 26 April 1999

ZTFLH:

TG174.5

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;. Effect of Hydrogen on Electronic Properties of Passive Film on Pure Iron. J Chin Soc Corr Pro, 2000, 20(2): 74-80 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2000/V20/I2/74

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