
Electromagnetic Shielding and Corrosion Protection for Aerospace Vehicles
by Gooch, Jan W.; Daher, John K.-
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Summary
Author Biography
Table of Contents
Preface | p. ix |
Acknowledgment | p. xi |
Electromagnetic Shielding Effectiveness and Corrosion Prevention | p. 1 |
Electromagnetic Environment | p. 1 |
Importance of Electromagnetic Shielding and Corrosion Prevention for Aircraft | p. 1 |
Fundamentals of Corrosion | p. 5 |
Corrosion | p. 5 |
Conditions for Corrosion | p. 6 |
Electrochemical Aspects | p. 6 |
Environmental Aspects | p. 8 |
Metallurgical Aspects | p. 10 |
Types of Corrosion | p. 11 |
Uniform Attack | p. 11 |
Galvanic or Two-Metal Corrosion | p. 12 |
Crevice Corrosion | p. 12 |
Pitting | p. 13 |
Intergranular Corrosion | p. 14 |
Selective Leaching | p. 14 |
Erosion Corrosion | p. 14 |
Stress Corrosion | p. 14 |
Fundamentals of Electromagnetic Shielding | p. 17 |
Definition of Shielding Effectiveness | p. 17 |
Factors that Determine Shielding Effectiveness | p. 17 |
Electromagnetic Shielding Theory | p. 18 |
Absorption Loss | p. 18 |
Reflection Loss | p. 20 |
Multiple Reflection Correction Term | p. 21 |
Effect of Near-Field Sources on Shielding Effectiveness | p. 21 |
Practical Electromagnetic Shielding | p. 22 |
Role of Conductive Sealants in Electromagnetic Shielding | p. 24 |
Investigation of the Relationship Between DC Resistance and Shielding Effectiveness | p. 25 |
Determining a Relationship Between DC Resistance and Shielding Effectiveness | p. 25 |
Stainless Steel Test Joint for DC Resistance and Shielding Effectiveness Measurements | p. 25 |
DC Resistance Measurements | p. 28 |
Shielding Effectiveness Measurements | p. 29 |
Measurement Results on the Relationship Between DC Resistance and Shielding Effectiveness | p. 30 |
Effect of Plate Separation on Shielding Effectiveness | p. 33 |
Identification and Evaluation of Optimum Conductive Sealant Materials | p. 35 |
Identification of Materials | p. 35 |
Evaluation of Conductive Sealants in Salt Spray Environment per ASTM B117 | p. 38 |
Aluminum Test Joints | p. 38 |
Measurement Results of DC Resistance Versus Salt Spray Exposure | p. 42 |
Measurement Results of Shielding Effectiveness Versus Salt Spray Exposure | p. 43 |
Summary of Optimum Conductive Sealant Materials | p. 46 |
Relationship Between DC Resistance, Shielding Effectiveness, and Transfer Impedance | p. 46 |
Evaluation of Laboratory Sealant Test Samples | p. 46 |
Field Test Evaluations on E-3A Aircraft | p. 57 |
Introduction | p. 57 |
Visits to Air Force Installations | p. 58 |
Field Test Description | p. 63 |
Location of Test Sites | p. 63 |
Field Test Methods | p. 63 |
E-3A Aircraft Field Test Results | p. 72 |
Conclusions | p. 73 |
Recommendations | p. 74 |
Assessment of the Validity of the MIL-B-50878 Class R Bonding Requirements | p. 75 |
Background | p. 75 |
Basis/Rational Behind the 2.5-Milliohm Bonding Requirements | p. 76 |
Summary and Conclusions on Validity of 2.5 Milliohm Bonding Requirements | p. 78 |
Proposed Changes to Standards, Specification and Handbooks | p. 78 |
Modifications to MIL-B-5087B | p. 80 |
Modifications to MIL-STD-188-124A | p. 82 |
Modifications to MIL-STD-1541 | p. 85 |
Modifications to MIL-STD-1542 | p. 86 |
Modifications to MIL-STD-454K | p. 87 |
Modifications to MIL-HDBK-253 | p. 88 |
Modifications to AFSC Design Handbook 1-4 | p. 91 |
Modifications to NATO STANAG No. 3659 | p. 97 |
Recommendations for Corrosion Prevention Materials/Processes for Use on Existing (and Future) Aircraft and Weapon Systems | p. 99 |
Recommendations for Using Corrosion Prevention Materials for retrofitting Existing Nuclear Harden Aircraft and Weapons Systems | p. 99 |
Retrofitting Aircraft with Conductive Sealant | p. 99 |
Annodized and Chemical Conversion Type Treated Aluminum Surfaces | p. 99 |
Resealable Joints Using Liquid Applied Conductive Sealants | p. 100 |
Resealable Joints in Salt Spray Chamber | p. 100 |
Opening Resealable Joints | p. 101 |
Comments | p. 101 |
Shielding Effectiveness of Non-Conductive Corrosion Inhibitive Sealant | p. 101 |
Aerospace Material Specification | p. 102 |
EMI Gaskets | p. 103 |
EMI Gasket Applications and Selection Criteria | p. 103 |
Stamped and Formed Metal Gaskets | p. 103 |
Wire Mesh Gaskets | p. 104 |
Conductively-Loaded Elastomeric Gaskets | p. 105 |
Conductive Fabric-Clad Foam Gaskets | p. 105 |
Conductive Gel Gaskets | p. 106 |
Shielding Effectiveness Data for Test Joints with Varying Resistances | p. 107 |
Shielding Effectiveness Versus Plate Separation Data | p. 117 |
References | p. 123 |
Index | p. 125 |
Table of Contents provided by Ingram. All Rights Reserved. |
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