TO 1-1-700 - Robins Air Force Base

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TO 1-1-700 11.13.7.2 Treatment of Corroded Areas on Cadmium or Zinc Plated Surfaces. Cadmium and zinc platings provide anodic protection to underlying steel (ferrous) and sometimes copper base metals. If the plating surface is broken during normal usage, the cadmium or zinc plate, being anodic to the base metal, will corrode preferentially and sacrificially protect the base metal. The removal of corrosion from cadmium or zinc plated surfaces shall be limited to the removal of the plating and the base metal corrosion products from the localized area of the underlying base metal. The directions for the application and use of chemical removers on these plated surfaces are found in Table 5-12 in Chapter 5 of TO 1-1-691. NOTE These procedures are intended only for field level treatment of localized corroded areas on cadmium or zinc plated surfaces and reapplication of a protective coating after corrosion removal. When the use of organic finishes or the thickness of the organic finish will impair the normal operation of a part, severely corroded parts must be removed and replaced. Where facilities are available, parts with severely corroded cadmium or zinc plating may be stripped and replated in accordance with procedures in TO 42C2-1-7. Small areas with severe corrosion may be replated by brush plating per MIL-STD-8651 using procedures in TO 42C2-1-7. When high strength steels are being replated, use only those specialized procedures authorized for high strength steels as many plating solutions can cause hydrogen embrittlement of these materials. 11.13.7.3 Treatment of Corroded Areas on Plated Surfaces Except Cadmium or Zinc Plating. When a break occurs in the surface of either chromium, nickel, tin, or copper platings, corrosion of the steel/ferrous base metal and undercutting of the plating will rapidly follow. The corrosion will occur at a highly accelerated rate due to the galvanic action of these platings which are highly cathodic to the steel (ferrous) base metals. Directions for the application and use of chemical removers on plated surfaces except cadmium and zinc platings are found in Table 5-12 in Chapter 5 of TO 1-1-691. NOTE These procedures are intended only for field level treatment of localized corroded areas on chromium, nickel, tin, and copper plated surfaces. Where service temperatures preclude the use of organic finishes and/ or the film thickness of the organic finish will impair normal operation of the part, severely corroded parts must be removed and replaced. Small areas with severe corrosion may be replated by brush plating per MIL-STD-8651 using procedures in TO 42C2-1-7. Where facilities are available, severely corroded parts with chromium, nickel, tin, or copper plating may be stripped and replated in accordance with procedures in TO 42C2-1-7. When high strength steels are being replated, use only those specialized procedures authorized for high strength steels as many plating solutions can cause hydrogen embrittlement of these materials. 11.13.7.4 Treatment of Corroded Areas on Phosphate Surfaces. Cadmium and zinc plated surfaces as well as many bare steel surfaces are treated with a phosphate coating at the time of manufacture to improve paint adhesion and corrosion resistance of the surfaces or as a base for the application of grease, oil, or CPCs. When phosphate surfaces corrode, corrosion should be removed by the method recommended for the base material. 11.13.8 Application of Organic Coatings. Organic coatings may be applied to phosphate surfaces and some plated surfaces to provide corrosion protection to the plating and/or to increase the corrosion protection the plating or phosphate coating provides to the base metal. They should not be used when the part operates at temperatures which preclude their use or when the finish will prevent the part from performing its intended function. Organic coatings shall not be used on bearing or wearing surfaces of gears, cams, slides, etc., and on surfaces requiring electrical conductivity. Apply the organic finish system specified in the applicable system specific equipment maintenance manual and/or engineering drawing and TO 35-1-3 for support equipment (SE) using TO 1-1-8 for application procedures. 11-22
TO 1-1-700 CHAPTER 12 SEALANTS 12.1 PURPOSE. This chapter covers sealing compounds and procedures for their application. When properly applied, sealants prevent the intrusion of moisture from condensation, rain, and salt water as well as dust, dirt, and fluids into joint areas where they can cause extensive corrosion. Sealants are one of the most important tools for corrosion prevention and control. To be effective, it is critical that the correct sealant be chosen for a specific area/situation and that it be applied correctly. Only qualified personnel thoroughly familiar with sealants and their application shall be permitted to handle and apply them. 12.2 APPLICATIONS. Sealants are used for the following reasons: • Fuel sealing (fuel tanks and delivery components). • Weather and fluid sealing (exterior and interior skin and structural joints and surfaces). • Electrical sealing (bulkhead wiring, electrical connectors and components). • Acid-resistant sealing (battery compartments). • High temperature sealing 12.3 SEALING COMPOUNDS. Table 12-1 lists approved sealing compounds, and their available types, properties, and intended use. Refer to the applicable maintenance manual and paragraph 12-7 for specific information concerning selection of the proper sealing compound and its application. Observe the warnings and cautions in paragraph 12-6 when using any sealing compound. NOTE See the Appendix A in TOs 1-1-691 and 1-1-689-5 for procurement information on sealants (NSNs, quantities, etc.) 12.3.1.1 Two-Part Kit (KT). The package consists of two separate containers, usually metal cans; one contains the catalyst (part A) and the other contains the base compound (part B), each in pre-measured amounts for mixing together. 12.3.1.2 Cartridge (CA). Cartridges come in two different types: one for single component sealants and one for two component sealants. 12.3.1.2.1 Single component sealants are contained in a plastic cartridge or tube in a ready to use condition requiring no mixing. If some of a single component sealant remains after a job, it can be stored and used at a future time as long as the cartridge/tube is tightly capped at the nozzle opening to prevent contact with air. 12.3.1.2.2 Two component sealants are packaged in Semkits® which are complete plastic cartridge assemblies that store both sealant components (each in separate chambers). Mixing of sealant materials is accomplished within the assembly, which is then used for application. Semkits® are convenient because they eliminate the need to measure and handle the materials for mixing, and generate less waste as they contain small quantities for small area applications. 12.3.1.3 Premixed and Frozen (PMF). Two component sealants can be premeasured, mixed, and frozen at temperatures of -40 °F (-40 °C) and stored at temperatures of -20 °F (-29 °C) or lower with the unit of issue being in ounces. The PMF material in plastic tubes is a convenient package configuration for low and intermittent usage applications, particularly in depot level operations. Simply thaw the material and use. 12.3.2 Polysulfide, Polyurethane, and Polythioether Sealing Compounds. All these materials are two component with the Part B base containing the prepolymer and the Part A catalyst containing the curing agent packaged in separate containers supplied together as a kit. When thoroughly mixed, the catalyst cures the prepolymer to a rubbery solid. The rate of cure depend on the type of prepolymer and catalyst, as well as the temperature and humidity. Full cure of these materials may require as long as 7 days. Refer to Table 12-1 for a general description of these materials. 12.3.1 Sealant Packaging. Sealants are generally packaged and available as three different types of packaging or units of issue (U/I): 12-1
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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
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TO 1-1-700 c. 6.2.6 Felt. Examine f
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TO 1-1-700 a. After first directing
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TO 1-1-700 6.4.5.14 Terminals, scre
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TO 1-1-700 NOTE • Authorized clea
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TO 1-1-700 Table 7-1. Cleaning of S
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TO 1-1-700 7.3.1.2.3 Portable, 45 g
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TO 1-1-700 Table 7-2. Common Milita
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TO 1-1-700 inactivity, storage, or
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TO 1-1-700 7.5.6.5.1 Grade 1 - A th
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TO 1-1-700 Table 7-4. Corrosion Pre
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TO 1-1-700 Table 7-5. Preservation
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TO 1-1-700 either case, MIL-PRF-269
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TO 1-1-700 MIL-PRF-85285, COATING,
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TO 1-1-700 c. Cadmium plated surfac
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TO 1-1-700 a. Scuff sand and feathe
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TO 1-1-700 7.7.7.2 If surface is no
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TO 1-1-700 7.7.9.2 Where only parti
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TO 1-1-700 7.8.1 Type I Application
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TO 1-1-700 Extend (Loctite) 32150 J
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TO 1-1-700 There are three ways to
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TO 1-1-700 vulnerable surfaces clea
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TO 1-1-700 Table 8-2. Materials, Th
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TO 1-1-700 Table 8-4. Electronic Cl
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TO 1-1-700 Table 8-5. Accessories o
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TO 1-1-700 Table 8-5. Accessories o
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TO 1-1-700 f. Devices with permanen
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TO 1-1-700 Table 8-7. Cleaning and
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TO 1-1-700 MIL-PRF-87937, CLEANING
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TO 1-1-700 of contamination). Maint
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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
Page 185 and 186: TO 1-1-700 b. Use e-inch rivnuts of
Page 187 and 188: TO 1-1-700 10.17.3 If the plating s
Page 189: TO 1-1-700 Figure 10-16. Dissipatio
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Page 196 and 197: TO 1-1-700 11.6 3M CO. SCOTCH-BRITE
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Page 204 and 205: TO 1-1-700 11.13.2.3 Application of
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Page 214 and 215: TO 1-1-700 MIL-A-46106, ADHESIVE/SE
Page 216 and 217: TO 1-1-700 Table 12-1. Sealing Comp
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Page 226 and 227: TO 1-1-700 Figure 12-2. Sealant App
Page 228 and 229: TO 1-1-700 Figure 12-4. Rivet Appli
Page 230 and 231: TO 1-1-700 Figure 12-6. Sealant Inj
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Page 240 and 241: TO 1-1-700 d. Remove all uncured se
Page 246 and 247: TO 1-1-700 Figure 12-12. Typical Me
Page 248 and 249: TO 1-1-700 may be used for low temp
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TO 1-1-700 - Robins Air Force Base

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