Electromagnetic Shielding and Corrosion Protection for Aerospace Vehicles

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Format: Hardcover
Pub. Date: 2007-02-28
Publisher(s): Springer Verlag
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Summary

Electromagnetic shielding is a critical requirement for aerospace, ground vehicles and structures that require protection from radiated electromagnetic energy and lightning strike. Corrosion destroys shielding effectiveness by reducing electrical conductivity. And therein lies the challenge: to maintain effective electromagnetic shielding while simultaneously negating environmental oxidation of metals, biological attack and general deterioration of conductive nonmetallic materials. The experimental work which forms the basis for this book has provided a novel technological understanding of electromagnetic shielding and how corrosion affects the shielding properties, and has been remarkably successful when applied to aerospace vehicles.

Author Biography

Dr. Jan W. Gooch earned a Bachelor of Science degree at Arkansas Polytechnic College and a Doctor of Philosophy degree in Polymer Science at the University of Southern Mississippi. Dr. Gooch is an Adjunct Professor of Chemical and Biomolecular Engineering at the Georgia Institute of Technology and an international consultant in the field of coatings technology, polymer science and engineering with twenty-seven years of research experience. Dr. Gooch was a Senior Engineer with Bechtel Group, Inc. and a Senior Scientist with Cook Paint & Varnish Company prior to joining the research faculty at the Georgia Institute of Technology. Dr. Gooch added biomedical materials and applications to his experience by serving as a National Research Council Associate from 2001 to 2004 years at the United States Army Institute of Surgical Research. Dr. Gooch has published one hundred and thirty-three journal papers and conference presentations, ten books and chapters, has been awarded fourteen patents and is affiliated with major national and international professional organizations. Dr. Gooch has assembled a comprehensive digest of scientific and engineering terms from a lengthy and successful career in polymeric materials and processing.

Table of Contents

Prefacep. ix
Acknowledgmentp. xi
Electromagnetic Shielding Effectiveness and Corrosion Preventionp. 1
Electromagnetic Environmentp. 1
Importance of Electromagnetic Shielding and Corrosion Prevention for Aircraftp. 1
Fundamentals of Corrosionp. 5
Corrosionp. 5
Conditions for Corrosionp. 6
Electrochemical Aspectsp. 6
Environmental Aspectsp. 8
Metallurgical Aspectsp. 10
Types of Corrosionp. 11
Uniform Attackp. 11
Galvanic or Two-Metal Corrosionp. 12
Crevice Corrosionp. 12
Pittingp. 13
Intergranular Corrosionp. 14
Selective Leachingp. 14
Erosion Corrosionp. 14
Stress Corrosionp. 14
Fundamentals of Electromagnetic Shieldingp. 17
Definition of Shielding Effectivenessp. 17
Factors that Determine Shielding Effectivenessp. 17
Electromagnetic Shielding Theoryp. 18
Absorption Lossp. 18
Reflection Lossp. 20
Multiple Reflection Correction Termp. 21
Effect of Near-Field Sources on Shielding Effectivenessp. 21
Practical Electromagnetic Shieldingp. 22
Role of Conductive Sealants in Electromagnetic Shieldingp. 24
Investigation of the Relationship Between DC Resistance and Shielding Effectivenessp. 25
Determining a Relationship Between DC Resistance and Shielding Effectivenessp. 25
Stainless Steel Test Joint for DC Resistance and Shielding Effectiveness Measurementsp. 25
DC Resistance Measurementsp. 28
Shielding Effectiveness Measurementsp. 29
Measurement Results on the Relationship Between DC Resistance and Shielding Effectivenessp. 30
Effect of Plate Separation on Shielding Effectivenessp. 33
Identification and Evaluation of Optimum Conductive Sealant Materialsp. 35
Identification of Materialsp. 35
Evaluation of Conductive Sealants in Salt Spray Environment per ASTM B117p. 38
Aluminum Test Jointsp. 38
Measurement Results of DC Resistance Versus Salt Spray Exposurep. 42
Measurement Results of Shielding Effectiveness Versus Salt Spray Exposurep. 43
Summary of Optimum Conductive Sealant Materialsp. 46
Relationship Between DC Resistance, Shielding Effectiveness, and Transfer Impedancep. 46
Evaluation of Laboratory Sealant Test Samplesp. 46
Field Test Evaluations on E-3A Aircraftp. 57
Introductionp. 57
Visits to Air Force Installationsp. 58
Field Test Descriptionp. 63
Location of Test Sitesp. 63
Field Test Methodsp. 63
E-3A Aircraft Field Test Resultsp. 72
Conclusionsp. 73
Recommendationsp. 74
Assessment of the Validity of the MIL-B-50878 Class R Bonding Requirementsp. 75
Backgroundp. 75
Basis/Rational Behind the 2.5-Milliohm Bonding Requirementsp. 76
Summary and Conclusions on Validity of 2.5 Milliohm Bonding Requirementsp. 78
Proposed Changes to Standards, Specification and Handbooksp. 78
Modifications to MIL-B-5087Bp. 80
Modifications to MIL-STD-188-124Ap. 82
Modifications to MIL-STD-1541p. 85
Modifications to MIL-STD-1542p. 86
Modifications to MIL-STD-454Kp. 87
Modifications to MIL-HDBK-253p. 88
Modifications to AFSC Design Handbook 1-4p. 91
Modifications to NATO STANAG No. 3659p. 97
Recommendations for Corrosion Prevention Materials/Processes for Use on Existing (and Future) Aircraft and Weapon Systemsp. 99
Recommendations for Using Corrosion Prevention Materials for retrofitting Existing Nuclear Harden Aircraft and Weapons Systemsp. 99
Retrofitting Aircraft with Conductive Sealantp. 99
Annodized and Chemical Conversion Type Treated Aluminum Surfacesp. 99
Resealable Joints Using Liquid Applied Conductive Sealantsp. 100
Resealable Joints in Salt Spray Chamberp. 100
Opening Resealable Jointsp. 101
Commentsp. 101
Shielding Effectiveness of Non-Conductive Corrosion Inhibitive Sealantp. 101
Aerospace Material Specificationp. 102
EMI Gasketsp. 103
EMI Gasket Applications and Selection Criteriap. 103
Stamped and Formed Metal Gasketsp. 103
Wire Mesh Gasketsp. 104
Conductively-Loaded Elastomeric Gasketsp. 105
Conductive Fabric-Clad Foam Gasketsp. 105
Conductive Gel Gasketsp. 106
Shielding Effectiveness Data for Test Joints with Varying Resistancesp. 107
Shielding Effectiveness Versus Plate Separation Datap. 117
Referencesp. 123
Indexp. 125
Table of Contents provided by Ingram. All Rights Reserved.

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