Optical and electrochemical studies of passive film formation in amorphous Ni‐Cr‐P‐C alloys

Authors

D. B. Hagan, Virginia Commonwealth University
B. W. Sloope, Virginia Commonwealth University
V. A. Niculescu, Virginia Commonwealth University

Document Type

Article

Original Publication Date

1989

Journal/Book/Conference Title

Journal of Applied Physics

Volume

66

Issue

8

DOI of Original Publication

10.1063/1.344024

Comments

Originally published at http://dx.doi.org/10.1063/1.344024

Date of Submission

October 2015

Abstract

The investigation of passivation of an amorphous Ni‐l4Cr‐17P‐0.5C alloy in lN H₂ SO₄ through anodic polarization and near‐normal optical reflectance is reported. It was found that the alloy passivates with a current density of 10^{− 1} A/m² extending to 1.0 V with current density dependent upon surface morphology. In the transpassive region under constant current density conditions the reflectance of the film exhibits strong interference phenomena and overall exponential decay in intensity. The behavior of the system in this region is described with a single thin‐film optical model consistent with the formation of a chromium phosphate deposit layer which increases in thickness at a rate of 7 nm/s at a 1.67 mV/s sweep rate.

Rights

Hagan, D. B., Sloope, B. W., Niculescu, V. A. Optical and electrochemical studies of passive film formation in amorphous Ni‐Cr‐P‐C alloys. Journal of Applied Physics 66, 3942 (1989). Copyright © 1989 AIP Publishing LLC.

Is Part Of

VCU Physics Publications