Boots – shoes – and leggings
Patent
1995-06-28
1999-05-04
Teska, Kevin J.
Boots, shoes, and leggings
148240, 436 6, G06F 1700
Patent
active
059010711
ABSTRACT:
The composition of an alloy is inhomogeneous, so that the Fermi level of electrons in the surface of the alloy differs depending upon positions. It is accordingly considered that a part susceptible to corrosion and a part less susceptible thereto will coexist in the alloy. The corrosion rate of the alloy is indicated as the exponential function of a potential difference (.DELTA..PHI..sub.H) within an electric double layer. The potential difference remains unchanged as long as the Fermi level lies within the forbidden band of the electrons. However, in a range in which the Fermi level falls within the valence band of the electrons, the lowering thereof leads to the increase of the potential difference. Accordingly, a corrosion-resisting alloy is designed in accordance with the following guidelines: a) The electron energy level (Ev) of the valence band is low, b) an oxide film to be formed on the alloy is an n-type semiconductor, c) a band gap (Ec-Ev) is wide where Ec denotes the conduction band of the electrons, and d) a flatband potential (E.sub.f1) is low. Further, the operation of a plant and the evaluation of a corrosional damage can be based on such a theory.
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Fujimori Haruo
Ishikawa Yuichi
Isobe Yusuke
Ohnaka Noriyuki
Sakai Masanori
Hitachi , Ltd.
Roberts A. S.
Teska Kevin J.
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