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Formation and reduction of the passive film on iron in phosphate-borate buffer solution

✍ Scribed by Kotaro Ogura; Tosikazu Majima

Publisher: Elsevier Science
Year: 1978
Tongue: English
Weight: 447 KB
Volume: 23
Category: Article
ISSN: 0013-4686
DOI: 10.1016/0013-4686(78)80017-6

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✦ Synopsis

The formation and reduction of the passive film on iron was investigated in a phosphate-borate buffer solution. The passive film produced in the present solution was approximately 12% thicker than that produced in the borate-boric acid solution (pH 8.4). The formation ofthe passive film obeyed the mechanism proposed previously. The reduction of the passive film was carried out galvanostatically, and the pHdependence of the potential arrest at approximately -0.5 V (see) was --0.09 V/pH. It is concluded that the ferric oxide was simultaneously reduced to metallic iron and ferrous ion at the potential arrest.

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