Diagrama de pourbaix del berilio

ANRCP-1999-30 October 1999

Amarillo National Resource Center for Plutonium
A Higher Education Consortium of The Texas A&M University System, Texas Tech University, and The University of Texas System

Modeling of Beryllium Corrosion

Juan Sanchez, Sheldon Landsberger, and Li Zhao Mechanical Engineering Department The University of Texas at Austin

This report was prepared with thesupport of the U.S. Department of Energy (DOE) Cooperative Agreement No. DEFC04-95AL85832. However, any opinions, findings, conclusions, or recommendations expressed herein are those of the author(s) and do not necessarily reflect the views of DOE. This work was conducted through the Amarillo National Resource Center for Plutonium.

Edited by Angela L. Woods Technical Editor

600 South Tyler • Suite800 • Amarillo, TX 79101 (806) 376-5533 • Fax: (806) 376-5561 http://www.pu.org

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ANRCP-1999-30

AMARILLO NATIONAL RESOURCE CENTER FOR PLUTONIUM/ A HIGHER EDUCATION CONSORTIUM

A Report on

Modeling of Beryllium Corrosion

Juan Sanchez, Sheldon Landsberger, and Li Zhao Department of Mechanical Engineering The University of Texas at Austin Austin,Texas 77812

Submitted for publication to

ANRC Nuclear Program

October 1999

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Modeling of Beryllium Corrosion
Juan Sanchez, Sheldon Landsberger, and Li Zhao Department of Mechanical Engineering The University of Texas at Austin

Abstract
This research examined whether experiments concerning beryllium corrosion can be conducted at roomtemperature with no adverse affects. Because corrosion depends on the respiratory environment, mechanisms and parameters associated with corrosion must be identified. There are 3 stages in the evolution of storage conditions. The ability to identify beryllium corrosion at various stages would be ideal.

Actual temperature for beryllium metal cladding is approximately 50°C. In calculating the Pourbaixdiagram of beryllium at room temperature (50°C) by Nerst equations, the diagram indicated a passivity range between pH 4 and pH 11. Comparing the passivity region at room temperature, almost no change at 50°C could be seen; in effect, room temperature did not affect the passivity of beryllium in aqueous solutions.

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TABLE OF CONTENTS

1.INTRODUCTION................................................................................................................... 1 2. IDENTIFICATION OF BERYLLIUM CORROSION....................................................... 2 3. THERMODYNAMIC CALCULATIONS FOR BERYLLIUM WITHIN CHLORINATE SOLVENTS................................................................................................ 5 4. POURBAIXDIAGRAM OF BERYLLIUM AT 50°C ...................................................... 11 5. CONCLUSIONS ................................................................................................................... 13 REFERENCES........................................................................................................................... 15

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Figure 1: Property Diagram of BeO in TCA ............................................................................... 6 Figure 2: Property Diagram of BeO in TCE ................................................................................ 6 Figure 3: BeCl2 in Solvents with Different Ratios of H/Cl.......................................................... 8 Figure 4:BeCl2 in Solvents with H/CL of Zero........................................................................... 8 Figure 5: The Property Diagram of BeO in CCl4 ......................................................................... 9 Figure 6: Pourbaix Diagram of Beryllium at Room Tempera*ture ........................................... 12 Figure 7: Pourbaix Diagram of Beryllium at 50°C...