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The effects of P implantation on passivity of Fe—Cr alloys in acidic electrolytes

Published online by Cambridge University Press:  29 June 2016

N. R. Sorensen ,
R. B. Diegle  and
S. T. Picraux
N. R. Sorensen
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
R. B. Diegle
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
S. T. Picraux
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
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Abstract

The passivation behavior of the P-implanted alloys in a Cl-containing electrolyte as a function of Cr concentration and P implantation has been investigated. At low Cr concentrations (6% Cr), P implantation sufficient to form an amorphous layer degrades the passive behavior of the base alloy and induces pitting, and at high-Cr levels (18%) P has little effect on passivation. However, at intermediate Cr levels (8%, 10%), P implantation significantly improves passivity, with the greatest improvement occurring at 10% Cr. When implanted to ∼25% P, the Fe–1OCr alloy exhibits a decrease in the passive current density by 4 orders of magnitude relative to the unimplanted alloy, and shows current decay characteristics that closely resemble those of the Fe–18Cr alloy.

Type
Articles
Information
Journal of Materials Research , Volume 1 , Issue 6 , December 1986 , pp. 752 - 757
Copyright
Copyright © Materials Research Society 1986

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