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

doi:10.1007/s11669-018-0684-6

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

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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 m ²/s in the Pt-Rh alloy at 1285more »« less

Authors:

Nakano, Anna ^[1]; Nakano, Jinichiro ^[1]; Bennett, James P. ^[2]; Morral, John E. ^[3]

National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
National Energy Technology Lab. (NETL), Albany, OR (United States)
The Ohio State Univ., Columbus, OH (United States)

Publication Date:: 2018-10-08

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:: 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: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: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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