Role of Chromium in Anomalous Behavior of the Passive Layer in Ni-Cr-Mo Alloys in 1 M HCl Solution

M. Karri; A. Verma; J.B. Singh; S.K. Bonagani; U.K. Goutam

doi:10.5006/3767

journal article Jan 07, 2022

Role of Chromium in Anomalous Behavior of the Passive Layer in Ni-Cr-Mo Alloys in 1 M HCl Solution

M. Karri A. Verma

J.B. Singh S.K. Bonagani U.K. Goutam

Corrosion Vol. 78 No. 3 pp. 228-238 · Association for Materials Protection and Performance (AMPP)

View at Publisher Save 10.5006/3767

Abstract

This work seeks to understand the underlying mechanism involved in the passivity of Ni-Cr-Mo alloys in a less concentrated HCl solution (1 M) by systematically varying contents of Cr and Mo solutes in model Ni-Cr-Mo alloys. Corrosion behavior was evaluated based on potentiodynamic polarization tests performed in conjunction with electrochemical impedance and x-ray photoelectron spectroscopies of passive films that formed on alloys during their exposure to the HCl solution. Results have shown that an increase in Mo alone is not sufficient to improve the corrosion resistance of the alloys at lower concentrations of HCl. Optimum concentrations of Cr and Mo solutes have been found to be in the vicinity of ∼17 wt% Cr and ∼19 wt% Mo for superior corrosion resistance of the alloys. This was attributed to the protection of the Cr2O3 layer as a consequence of the enrichment of Mo6+ ions in the passive film in 1 M HCl solution.

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Metrics

8

Citations

68

References

Details

Published: Jan 07, 2022
Vol/Issue: 78(3)
Pages: 228-238

Authors

M

M. Karri

*Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Mumbai 400085, India.

A

A. Verma

*Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Mumbai 400085, India.

J

J.B. Singh

*Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Mumbai 400085, India.

S

S.K. Bonagani

**Materials Processing & Corrosion Engineering Division, Bhabha Atomic Research Centre, Mumbai 400085, India.

U

U.K. Goutam

***Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India.

Cite This Article

M. Karri, A. Verma, J.B. Singh, et al. (2022). Role of Chromium in Anomalous Behavior of the Passive Layer in Ni-Cr-Mo Alloys in 1 M HCl Solution. Corrosion, 78(3), 228-238. https://doi.org/10.5006/3767

Role of Chromium in Anomalous Behavior of the Passive Layer in Ni-Cr-Mo Alloys in 1 M HCl Solution

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