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《Electromagnetic Shielding and Corrosion Protection for Aerospace Vehicles》
航空航天车辆的电磁屏蔽与防腐
作者：
Jan W. Gooch
John K. Daher
GeorgiaInstituteof Technology, Atlanta
出版社：Springer
出版时间：2007年
《Electromagnetic Shielding and Corrosion Protection for Aerospace Vehicles》
《Electromagnetic Shielding and Corrosion Protection for Aerospace Vehicles》
《Electromagnetic Shielding and Corrosion Protection for Aerospace Vehicles》
《Electromagnetic Shielding and Corrosion Protection for Aerospace Vehicles》
目录
Preface ix
Acknowledgment xi
1. Electromagnetic Shielding Effectiveness and Corrosion Prevention 1
1.1 Electromagnetic Environment. 1
1.2 Importance of Electromagnetic Shielding and Corrosion
Prevention for Aircraft 1
2. Fundamentals of Corrosion 5
2.1 Corrosion 5
2.2 Conditions for Corrosion 6
2.2.1 Electrochemical Aspects 6
2.2.2 Environmental Aspects 8
2.2.3 Metallurgical Aspects 10
2.3 Types of Corrosion 11
2.3.1 Uniform Attack 11
2.3.2 Galvanic or Two-Metal Corrosion 12
2.3.3 Crevice Corrosion 12
2.3.4 Pitting 13
2.3.5 Intergranular Corrosion 14
2.3.6 Selective Leaching 14
2.3.7. Erosion Corrosion 14
2.3.8 Stress Corrosion 14
3. Fundamentals of Electromagnetic Shielding 17
3.1 Definition of Shielding Effectiveness 17
3.2 Factors that Determine Shielding Effectiveness 17
3.3 Electromagnetic Shielding Theory 18
3.3.1 Absorption Loss 18
3.3.2 Reflection Loss 20
3.3.3 Multiple Reflection Correction Term 21
3.3.4 Effect of Near-Field Sources on Shielding Effectiveness 21
3.4 Practical Electromagnetic Shielding 22
3.5 Role of Conductive Sealants in Electromagnetic Shielding 24
4. Investigation of the Relationship Between DC Resistance and
Shielding Effectiveness ..•.•.................................................................................. 25
4.1 Determining a Relationship Between DC Resistance and Shielding
Effectiveness 25
4.2 Stainless Steel Test Joint for DC Resistance and Shielding
Effectiveness Measurements 25
4.3 DC Resistance Measurements 28
4.4 Shielding Effectiveness Measurements 29
4.5 Measurement Results on the Relationship Between DC Resistance
and Shielding Effectiveness 30
4.6 Effect of Plate Separation on Shielding Effectiveness 33
5. Identification and Evaluation of Optimum Conductive Sealant
Materials 35
5.1 Identification of Materials 35
5.2 Evaluation of Conductive Sealants in Salt Spray Environment per
ASTM B117 38
5.2.1 Aluminum Test Joints 38
5.2.2 Measurement Results of DC Resistance Versus Salt Spray
Exposure 42
5.2.3 Measurement Results of Shielding Effectiveness Versus
Salt Spray Exposure 43
5.3 Summary of Optimum Conductive Sealant Materials 46
5.4 Relationship Between DC Resistance, Shielding Effectiveness, and
Transfer Impedance 46
5.4.1 Evaluation of Laboratory Sealant Test Samples 46
6. Field Test Evaluations on E-3A Aircraft 57
6.1 Introduction 57
6.1.2 Visits to Air Force Installations 58
6.2 Field Test Description 63
6.2.1 Location of Test Sites 63
6.2.2 Field Test Methods 63
6.2.3 E-3A Aircraft Field Test Results 72
6.3 Conclusions 73
6.4 Recommendations 74
7 Assessment of the Validity of the MIL-B-50878 Class R Bonding
Requirements 75
7.1 Background 75
7.2 BasislRational Behind the 2.5-Milliohm Bonding Requirements 76
7.3 Summary and Conclusions on Validity of2.5 Milliohm Bonding
Requirements 78
7.4 Proposed Changes to Standards, Specification and Handbooks 78
7.4.1 Modifications to MIL-B-5087B 80
7.4.2 Modifications to MIL-STD-188-124A 82
7.4.3 Modifications to MIL-STD-1541 85
7.4.4 Modifications to MIL-STD-1542 86
7.4.5 Modifications to MIL-STD-454K 87
7.4.6 Modifications to MIL-HDBK-253 88
7.4.7 Modifications to AFSC Design Handbook 1-4 91
7.4.8 Modifications to NATO STANAG No. 3659 97
7.5 Recommendations for Corrosion Prevention Materials/Processes
for Use on Existing (and Future) Aircraft and Weapon Systems 99
7.6 Recommendations for Using Corrosion Prevention Materials for
retrofitting Existing Nuclear Harden Aircraft and Weapons
Systems 99
7.6.1 Retrofitting Aircraft with Conductive Sealant 99
7.6.2. Annodized and Chemical Conversion Type Treated
Aluminum Surfaces 99
7.7 Resealable Joints Using Liquid Applied Conductive Sealantsl00
7.7.1 Resealable Joints in Salt Spray Chamber. 100
7.7.2 Opening Resealable Joints 101
7.7.3 Comments 101
7.8 Shielding Effectiveness of Non-Conductive Corrosion Inhibitive
Sealant 101
7.9 Aerospace Material Specification 102
8. EMI Gaskets 103
8.1 EMI Gasket Applications and Selection Criteria 103
8.2 Stamped and Formed Metal Gaskets 103
8.3 Wire Mesh Gaskets 104
8.4 Conductively-Loaded Elastomeric Gaskets 105
8.5 Conductive Fabric-Clad Foam Gaskets 105
8.6 Conductive Gel Gaskets 106
A. Shielding Effectiveness Data for Test Joints with Varying
Resistances ..........•.............................................................................................. 107
B. Shielding Effectiveness Versus Plate Separation Data.....•............................117
References.....•.•......••..•.•......................•.........................••.......•........•........................ 123
Index.••.•••........•.•.....•.......•...•.......................•...............•..............•........................•....• 125
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