ECLSS Universal Waste Management System (UWMS) ??Electrochemical and Crevice Corrosion Evaluation ... Results of Corrosion Testing ... Method for evaluation of critical pitting and

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  • NASA/CR2017218240

    ECLSS Universal Waste Management System (UWMS) Metal Materials Compatibility StudyElectrochemical and Crevice Corrosion EvaluationR.E. LeeJacobs ESSSA Group, Huntsville, Alabama

    May 2017

    National Aeronautics andSpace AdministrationIS02George C. Marshall Space Flight CenterHuntsville, Alabama 35812

    Prepared for Marshall Space Flight Centerunder Contract NNM12AA41C

    https://ntrs.nasa.gov/search.jsp?R=20170005171 2018-05-30T15:01:06+00:00Z

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  • i

    NASA/CR2017218240

    ECLSS Universal Waste Management System (UWMS) Metal Materials Compatibility StudyElectrochemical and Crevice Corrosion EvaluationR.E. LeeJacobs ESSSA Group, Huntsville, Alabama

    May 2017

    National Aeronautics andSpace Administration

    Marshall Space Flight Center Huntsville, Alabama 35812

    Prepared for Marshall Space Flight Centerunder Contract NNM12AA41Cand sponsored byJacobs ESSSA Groupmanaged at Marshall Space Flight Center

  • ii

    Available from:

    NASA STI Information DeskMail Stop 148

    NASA Langley Research CenterHampton, VA 236812199, USA

    7578649658

    This report is also available in electronic form at

    TRADEMARKS

    Trade names and trademarks are used in this report for identification only. This usage does not constitute an official endorsement, either expressed or implied, by the National Aeronautics and Space Administration.

  • iii

    TABLE OF CONTENTS

    1. Introduction ........................................................................................................................ 1

    1.1 Background and Summary ........................................................................................... 1 1.2 Polarization Concepts ................................................................................................... 2

    2. Experimental ....................................................................................................................... 3

    2.1 Test Sample Preparation ............................................................................................... 3 2.2 Procedures and Techniques ........................................................................................... 4

    3. Results of Corrosion Testing ............................................................................................... 9

    3.1 Crevice Corrosion Assessment ...................................................................................... 9 3.2 Electrochemical Assessment ......................................................................................... 11 3.3 Summary and Conclusions ........................................................................................... 22

    APPENDIX ............................................................................................................................. 23

    A.1 Electrochemistry Concepts ......................................................................................... 23 A.2 Test Configuration and Parameter Definition ............................................................ 23 A.3 The Polarization Curve .............................................................................................. 25 A.4 The Butler-Volmer Equation ...................................................................................... 26 A.5 Faradays Law and Oxidation Rates ........................................................................... 28 A.6 Estimation of Currents and Rates .............................................................................. 29 A.7 Analysis of Cyclic Polarization Curves ...................................................................... 34 A.8 Semi-Log vs. Normal Cyclic Polarization Plots ........................................................... 37 A.9 Special Method for Determination of Electron Exchange Equivalents ....................... 39 A.10 Model Development for Pitting Rates and Penetration Depths Over Time ................ 42 A.11 Increasing Solution pH Over Time ............................................................................. 45 A.12 Special Method for Estimating Corrosion Susceptibilities .......................................... 48 A.13 Passive Films as Pseudo-Capacitors and Semiconductors ........................................... 53 A.14 Anomalies on Nickel Alloys under Extreme Test Conditions ...................................... 54

    REFERENCES ....................................................................................................................... 61

  • iv

    LIST OF FIGURES

    1. Images of the (a) PAR 2273 potentiostat test system, (b) Gamry 300 potentiostat test unit and (c) flat test cell which can be attached to either system ........................................................................................................... 5

    2. Typical workstation and test cell configuration showing two stacked PAR workstations with two test cells in operation (center) at MSFC ...................... 6

    3. Incremental flow sequence for polarization testing ................................................. 8

    4. Images with descriptions of crevice sample surfaces after six months in the test solutions ................................................................................................. 10

    5. Images with descriptions of crevice sample surfaces after one year storage ............. 10

    6. Linear polarization test plot and analysis for Hastelloy C276 in Concentrated Pretreat ................................................................................................................... 12

    7. Tafel polarization test plot and analysis for Titanium 6Al-4V in Diluted Pretreat ................................................................................................................... 13

    8. Cyclic polarization test plot with parameter descriptions for Inconel 625 in Concentrated Pretreat ......................................................................................... 15

    A1. Simple diagram of the PAR potentiostat and flat cell connections used in this project .......................................................................................................... 24

    A2. Current versus potential plot for one of the Cronidur samples showing anodic and cathodic branches ................................................................................. 25

    A3. Linear polarization test plot and analysis for Hastelloy C276 in Concentrated Pretreat ......................................................................................... 31

    A4. Semi-log Tafel polarization test plot and analysis for Titanium 6AI-4V in Diluted Pretreat .................................................................................................. 32

    A5. Possible pathways of Titanium, Chromium, and Nickel in acidic solution ...............................................................