TO 1-1-700 - Robins Air Force Base

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TO 1-1-700 Table 8-2. Materials, Their Electronic Applications, and Corrosion Symptoms - Continued Copper Cadmium Silver In electronics, copper is used for contacts, springs, leads, connectors, PCB conductors, and wires. While copper is fairly resistant to atmospheric corrosion, it is anodic to iron, steel, aluminum, and magnesium. This can cause galvanic deterioration in the presence of moisture. Cadmium is used as a plating to protect steel items. Cadmium is anodic with respect to steel, and thus is sacrificed when corrosive conditions exist. Silver is used as a plating in a variety of electronic applications. Corrosion of copper usually produces bluegreen salts, indicating active surface corrosion. The gray-green crust that frequently forms on copper structures is a protective oxide coating and should not be removed unless it is impairing the functionality of the device. Corrosion in cadmium plating produces a white, brown or black mottling on the surface. When this corrosion product is present, it indicates that the cadmium is still protecting the steel underneath. However, when rust appears, the cadmium is no longer providing protection to the steel underneath. Silver does not corrode in the conventional sense. It does, however, tarnish, producing a brown to black film. This film should only be removed if it is affecting the performance of the component. When silver is plated over copper, accelerated deterioration of the copper can occur. The product of this deterioration is called red plague. The product is a red and brown deposit on any exposed copper. Gold Gold is used as a plating in a variety of electronic applications. Purple Plague is a brittle compound formed when corrosion occurs in a gold-plated aluminum part. Tin Material Typical Applications Corrosion Symptoms Tin is used in solder. Also, tin plating is used on RF shields, filters, crystal covers, and automatic switching devices. Gold is very corrosion resistant and does not normally corrode. Gold will tarnish, however. Removing this tarnish is critical because gold plating is typically applied with a very small thickness. Also, gold plated over copper or silver will accelerate the corrosion of the copper or silver if there are any breaks in the plating. This corrosion is identified as tarnishing of the silver and blue-green deposits on the copper. Tin tends to grow “whiskers” on tin-plated wires or leads. Nickel Nickel is used as an electroless coating. Nickel is subject to pitting corrosion. Also, flaking of the nickel can occur as the base material corrodes. Table 8-3. Deterioration of Non-Metallic Materials Material Type of Attack to Which Material is Susceptible Appearance of Deterioration Acrylic UV light, moisture solvents Discoloration, cracking Adhesive Dirt, UV light, solvent moisture Cracking, peeling Ceramic Extreme heat Discoloration, cracking 8-6
TO 1-1-700 Table 8-3. Deterioration of Non-Metallic Materials - Continued Material Type of Attack to Which Material is Susceptible Cloth Dry rot, mildew Discoloration, tears, dust Conformal coating Moisture, scratches Peeling, flaking, bubbling Cork Moisture, mildew, dry rot Discoloration, dust, peeling Elastomer Heat, UV light, excessive cycling Cracks, crazing, discoloration Encapsulation UV light, moisture Cracking, peeling, disbonding Felt Moisture, mildew Discoloration, looseness Glass Heat, mechanical damage Cracked, discolored Appearance of Deterioration Laminates UV light, moisture solvents Discolored, disbond, delamination Paint Moisture, heat, humidity Bubbles, peeling, cracking Polymers Extreme heat, solvents Discoloration, deformation Potting compounds UV light, moisture, heat Discoloration, cracks, deformation RTV (non-corrosive) Moisture, UV light, heat Peeling, debonding, discoloration Sealants Moisture, UV light, heat Peeling, debonding, discoloration 8.5.6.3 Evaluation of Damage. Corrosion damage should be classified as either repairable or non-repairable. Non-repairable damage is damage that exceeds the limits specified in equipment system specific technical manuals. If no limits are present, consult the appropriate engineering authority for disposition of damaged items. 8.6 CLEANING. Cleaning is an essential step in performing preventative maintenance and corrosion control on electronic equipment. Thorough cleaning prior to the inspection maximizes the chances that the technician will be able to locate all signs of corrosion. Once the corrosion has been removed, thorough cleaning minimizes the chances that corrosion byproducts will contaminate the component and facilitate continued corrosion. 8.6.1 Required Materials and Support Equipment. It is essential that technicians understand the purpose, function, and applications of all materials and support equipment. Use of incorrect materials or processes can damage equipment, cause corrosion, or aggravate existing corrosion. Table 8-3 contains a list of approved consumable materials. Table 8-4 contains a listing of approved equipment and accessories. Table 8-5 contains recommended methods for cleaning various types of electronic equipment. Table 8-4. Electronic Cleaning and Corrosion Removal Consumable Materials Item No. Nomenclature Specification National Stock No. Unit of Issue Intended Use 1 Abrasive Mat, Aluminum Oxide Abrasive A-A-58054 Type I, Grade A, Class I (Very Fine) or A-A-58054 Type I, Grade B, Class 1 (Fine) ABRASIVES 5350-00-967-5089 5350-00-967-5093 Pkg. of 10, 9″ x 6″ pads Pkg. of 10, 9″ x 6″ pads Aluminum oxide impregnated nylon webbing used for removal of dirt and corrosive products from external avionic chassis, covers, mountings, hardware, antennas, electrical connector shells, etc. 8-7
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TO 1-1-700 TECHNICAL MANUAL CORROSI
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TO 1-1-700 TABLE OF CONTENTS Chapte
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TO 1-1-700 TABLE OF CONTENTS - CONT
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TO 1-1-700 LIST OF ILLUSTRATIONS -
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TO 1-1-700 FOREWORD 1. PURPOSE. The
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TO 1-1-700 List of Related Publicat
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TO 1-1-700 SAFETY SUMMARY 1. GENERA
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TO 1-1-700 AMS-G-6032, GREASE, PLUG
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TO 1-1-700 MIL-DTL-64159, COATING,
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TO 1-1-700 MIL-PRF-27617, GREASE, A
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TO 1-1-700 O-L-164, DRESSING, LEATH
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TO 1-1-700 MIL-T-81772, THINNER, PO
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TO 1-1-700 tronics equipment and th
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TO 1-1-700 cleaning situation, syst
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TO 1-1-700 c. Riveted joints shall
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TO 1-1-700 c. Remove and replace an
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TO 1-1-700 MIL-L-87177, LUBRICANT,
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TO 1-1-700 Figure 3-1. Simplified C
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TO 1-1-700 resistant, and also at t
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TO 1-1-700 is first noticeable as a
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TO 1-1-700 3.7.8 Oxygen Concentrati
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TO 1-1-700 Figure 3-14. Concentrati
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TO 1-1-700 Figure 3-17. Galvanic Se
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TO 1-1-700 Figure 3-20. Aluminum Su
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TO 1-1-700 3.8.7 CRES/Stainless Ste
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TO 1-1-700 3.9.10 Climate. Warm, mo
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TO 1-1-700 3.11 PREVENTATIVE MAINTE
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TO 1-1-700 CHAPTER 4 COMPOSITE AND
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TO 1-1-700 4.4.4.4 Glass parts shal
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TO 1-1-700 CHAPTER 5 PACKAGING (STO
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TO 1-1-700 extent of damage dependi
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TO 1-1-700 5.15 PRECAUTIONS FOR VCI
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TO 1-1-700 c. Secure the desiccant
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TO 1-1-700 Figure 5-8. Shock Isolat
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TO 1-1-700 Figure 5-9. Examples of
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TO 1-1-700 5.24.10 Rigid or Flexibl
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TO 1-1-700 CHAPTER 6 MOISTURE AND F
Page 83 and 84: TO 1-1-700 c. 6.2.6 Felt. Examine f
Page 85 and 86: TO 1-1-700 a. After first directing
Page 87: TO 1-1-700 6.4.5.14 Terminals, scre
Page 90 and 91: TO 1-1-700 NOTE • Authorized clea
Page 92 and 93: TO 1-1-700 Table 7-1. Cleaning of S
Page 102 and 103: TO 1-1-700 7.3.1.2.3 Portable, 45 g
Page 104 and 105: TO 1-1-700 Table 7-2. Common Milita
Page 106 and 107: TO 1-1-700 inactivity, storage, or
Page 108 and 109: TO 1-1-700 7.5.6.5.1 Grade 1 - A th
Page 110 and 111: TO 1-1-700 Table 7-4. Corrosion Pre
Page 112 and 113: TO 1-1-700 Table 7-5. Preservation
Page 114 and 115: TO 1-1-700 either case, MIL-PRF-269
Page 116 and 117: TO 1-1-700 MIL-PRF-85285, COATING,
Page 118 and 119: TO 1-1-700 c. Cadmium plated surfac
Page 120 and 121: TO 1-1-700 a. Scuff sand and feathe
Page 122 and 123: TO 1-1-700 7.7.7.2 If surface is no
Page 124 and 125: TO 1-1-700 7.7.9.2 Where only parti
Page 126 and 127: TO 1-1-700 7.8.1 Type I Application
Page 128 and 129: TO 1-1-700 Extend (Loctite) 32150 J
Page 130 and 131: TO 1-1-700 There are three ways to
Page 132 and 133: TO 1-1-700 vulnerable surfaces clea
Page 136 and 137: TO 1-1-700 Table 8-4. Electronic Cl
Page 150 and 151: TO 1-1-700 Table 8-5. Accessories o
Page 152 and 153: TO 1-1-700 Table 8-5. Accessories o
Page 154 and 155: TO 1-1-700 f. Devices with permanen
Page 156 and 157: TO 1-1-700 Table 8-7. Cleaning and
Page 158 and 159: TO 1-1-700 MIL-PRF-87937, CLEANING
Page 160 and 161: TO 1-1-700 of contamination). Maint
Page 162 and 163: TO 1-1-700 8.8.2 Protective Coating
Page 164 and 165: TO 1-1-700 • Tube clamps. • Min
Page 166 and 167: TO 1-1-700 a. For bonding/grounding
Page 168 and 169: TO 1-1-700 vertently destroy the mo
Page 170 and 171: TO 1-1-700 doors, and other corrosi
Page 173 and 174: TO 1-1-700 CHAPTER 10 CORROSION PRO
Page 175 and 176: TO 1-1-700 MIL-PRF-81733, SEALING A
Page 177 and 178: TO 1-1-700 d. After corrosion is re
Page 179 and 180: TO 1-1-700 (3) Stainless/CRES steel
Page 181 and 182: TO 1-1-700 10.9 WATER ENTRAPMENT AR
Page 183 and 184: TO 1-1-700 f. Shield equipment from
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TO 1-1-700 b. Use e-inch rivnuts of
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TO 1-1-700 10.17.3 If the plating s
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TO 1-1-700 Figure 10-16. Dissipatio
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TO 1-1-700 (2) If allowable damage
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TO 1-1-700 Table 11-1. Recommended
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TO 1-1-700 11.6 3M CO. SCOTCH-BRITE
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TO 1-1-700 11.11.2 Control of Mecha
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TO 1-1-700 11.12.2 Mechanical Damag
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TO 1-1-700 MIL-DTL-81706 (ALODINE),
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TO 1-1-700 11.13.2.3 Application of
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TO 1-1-700 only when there is no da
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TO 1-1-700 NOTE SEMCO PASA-JELL 101
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TO 1-1-700 (CRES), lead, ceramic, g
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TO 1-1-700 11.13.7.2 Treatment of C
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TO 1-1-700 MIL-A-46106, ADHESIVE/SE
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TO 1-1-700 Table 12-1. Sealing Comp
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TO 1-1-700 used to apply sealants i
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TO 1-1-700 Figure 12-2. Sealant App
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TO 1-1-700 Figure 12-4. Rivet Appli
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TO 1-1-700 Figure 12-6. Sealant Inj
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TO 1-1-700 below and adhere very po
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TO 1-1-700 Table 12-2. Time Require
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TO 1-1-700 Table 12-2. Time Require
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TO 1-1-700 of 20 to 25 seconds in a
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TO 1-1-700 d. Remove all uncured se
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TO 1-1-700 MIL-PRF-81733, SEALING A
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TO 1-1-700 MIL-PRF-81733, SEALING A
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TO 1-1-700 Figure 12-12. Typical Me
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TO 1-1-700 may be used for low temp
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TO 1-1-700 Figure 12-14. Sealing Pr
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TO 1-1-700 - Robins Air Force Base

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