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Title: High Temperature Corrosion of a Pt-30 wt.% Rh Alloy in a Phosphorizing Gas

Abstract

High temperature corrosion of a Pt-30 wt.% Rh alloy in a phosphorizing gas was isothermally investigated at 1285 K using a gas switching technique. Diffusion of P into the alloy created an outer layer of Pt-rich liquid and blocky (Pt, Rh)2P precipitates along with an inner layer of fcc and (Pt, Rh)2P plates in a cellular microstructure. Concentration profiles measured by SEM-WDS and EPMA across the layers at room temperature showed that there were three fcc phases: first was a 12 at.% Rh phase in the outer layer; second was a 37 at.% Rh phase in the cellular microstructure; and third was the initial 43 at.% Rh alloy. Also, the EPMA data registered approximately 0.1 at.% P in fcc of these layers. Based on the surrounding binary phase diagrams and the experimental data obtained in this study, a partial Pt-Rh-P phase diagram was constructed. A diffusion path for the corrosion microstructure was drawn on the partial phase diagram to help develop a step by step model for how the microstructure evolved. In conclusion, growth kinetics of the inner layer were used to calculate a P diffusivity of about 10–12 m2/s in the Pt-Rh alloy at 1285 K, suggesting rapid diffusionmore » by either an interstitial or interstitialcy mechanism.« less

Authors:
 [1];  [1];  [2];  [3]
+ Show Author Affiliations
  1. National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
  2. National Energy Technology Lab. (NETL), Albany, OR (United States)
  3. The Ohio State Univ., Columbus, OH (United States)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Albany, OR (United States)
Sponsoring Org.:
FE; USDOE
OSTI Identifier:
1509706
Grant/Contract Number:  
FE0004000; Inter-Agency Working Group for Air Force Research Laboratory
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Phase Equilibria and Diffusion
Additional Journal Information:
Journal Volume: 39; Journal Issue: 6; Journal ID: ISSN 1547-7037
Publisher:
ASM International
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; concentration profiles; diffusion; diffusion paths; electron probe microanalysis (EPMA); equilibrium diagram

Citation Formats

Nakano, Anna, Nakano, Jinichiro, Bennett, James P., and Morral, John E. High Temperature Corrosion of a Pt-30 wt.% Rh Alloy in a Phosphorizing Gas. United States: N. p., 2018. Web. doi:10.1007/s11669-018-0684-6.
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Nakano, Anna, Nakano, Jinichiro, Bennett, James P., & Morral, John E. High Temperature Corrosion of a Pt-30 wt.% Rh Alloy in a Phosphorizing Gas. United States. doi:https://doi.org/10.1007/s11669-018-0684-6
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Nakano, Anna, Nakano, Jinichiro, Bennett, James P., and Morral, John E. Mon . "High Temperature Corrosion of a Pt-30 wt.% Rh Alloy in a Phosphorizing Gas". United States. doi:https://doi.org/10.1007/s11669-018-0684-6. https://www.osti.gov/servlets/purl/1509706.
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@article{osti_1509706,
title = {High Temperature Corrosion of a Pt-30 wt.% Rh Alloy in a Phosphorizing Gas},
author = {Nakano, Anna and Nakano, Jinichiro and Bennett, James P. and Morral, John E.},
abstractNote = {High temperature corrosion of a Pt-30 wt.% Rh alloy in a phosphorizing gas was isothermally investigated at 1285 K using a gas switching technique. Diffusion of P into the alloy created an outer layer of Pt-rich liquid and blocky (Pt, Rh)2P precipitates along with an inner layer of fcc and (Pt, Rh)2P plates in a cellular microstructure. Concentration profiles measured by SEM-WDS and EPMA across the layers at room temperature showed that there were three fcc phases: first was a 12 at.% Rh phase in the outer layer; second was a 37 at.% Rh phase in the cellular microstructure; and third was the initial 43 at.% Rh alloy. Also, the EPMA data registered approximately 0.1 at.% P in fcc of these layers. Based on the surrounding binary phase diagrams and the experimental data obtained in this study, a partial Pt-Rh-P phase diagram was constructed. A diffusion path for the corrosion microstructure was drawn on the partial phase diagram to help develop a step by step model for how the microstructure evolved. In conclusion, growth kinetics of the inner layer were used to calculate a P diffusivity of about 10–12 m2/s in the Pt-Rh alloy at 1285 K, suggesting rapid diffusion by either an interstitial or interstitialcy mechanism.},
doi = {10.1007/s11669-018-0684-6},
journal = {Journal of Phase Equilibria and Diffusion},
number = 6,
volume = 39,
place = {United States},
year = {2018},
month = {10}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI:  https://doi.org/10.1007/s11669-018-0684-6
Copyright Statement
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Figures / Tables:

Fig. 1 Fig. 1: Schematic experimental set-up (Not to scale)
All figures and tables (11 total)
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Works referenced in this record:

The P-Rh (phosphorus-rhodium) system
journal, August 1990

The kinetics of cellular segregation reactions
journal, January 1959

The P-Pt (Phosphorus-Platinum) system
journal, October 1990

Phosphorus on platinum — Field electron emission microscopy studies
journal, February 1986

Failure mechanisms in Pt–Rh thermocouple sensors caused by gaseous phosphorous species
journal, February 2016

Diffusion Path Theorems for Ternary Diffusion Couples
journal, December 2011

Thermodynamic properties and phase equilibria for Pt-Rh alloys
journal, June 1998

  • Jacob, K. T.; Priya, Shashank; Waseda, Yoshio
  • Metallurgical and Materials Transactions A, Vol. 29, Issue 6
  • DOI: 10.1007/s11661-998-0076-3

Pt-Rh (platinum-rhodium)
journal, April 1992

The adsorption of sulfur on the (100) and (111) faces of platinum; A LEED and AES study
journal, April 1975

Diffusion Behaviour in Ternary, Multiphase Systems
journal, January 1963

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    Figures / Tables found in this record:

    Fig. 1 (p. 4)figure
    Fig. 2 (p. 5)figure
    Fig. 3 (p. 7)figure
    Fig. 4 (p. 8)figure
    Fig. 5 (p. 10)figure
    Fig. 6 (p. 12)figure
    Fig. 7 (p. 13)figure
    Fig. 8 (p. 16)figure
    Fig. 9 (p. 17)figure
    Fig. 10 (p. 20)figure
    Fig. 11 (p. 21)figure
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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

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