TO 1-1-700 - Robins Air Force Base

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TO 1-1-700 (2) If allowable damage limits will be exceeded, repair the damaged area or replace parts per procedures in system specific equipment repair manuals/technical orders. Coordinate any repair or part replacement not covered in these manuals/technical orders with the equipment SPM. 11.3.1 Mechanical Methods. There are various mechanical methods for removing corrosion from metal surfaces. The method used and the types of tools and equipment selected for the removal operation depend on the type of metal involved, the location and accessibility of the corroded area, the degree of damage, and the type of corrosion involved. It is important that the removal method, tools, and equipment selected be compatible with the metal surface. Compatibility involves two considerations: the mechanical effect of the equipment and tools on the surface, and the compatibility of metallic particles worn off the removal equipment and tools which might become embedded in the metal surface. Corrosion removal accessories/tools, such as flap brushes or rotary files, shall be used on one type of metal only. For example, a flap brush used to remove corrosion from aluminum alloys shall not be used to remove corrosion from magnesium alloys or steel also. 11.3.1.1 Mechanical Compatibility. Mechanical compatibility refers to the selection of the right tools and equipment to prevent additional damage caused by the removal process. Often it is necessary to select a series of removal techniques involving the use of different grades or classes of equipment and material to effectively remove the corrosion products. The initial use of a rapid and coarse removal method followed by a slower and finer removal method produces a smooth metal surface finish (e.g., using a vacuum blaster first followed by using a fine abrasive cloth or paper to finish the job). 11.3.1.2 Material Compatibility. Material compatibility refers to using a medium for brushing, abrading, blasting, etc., which will not cause additional corrosion. Material compatibilities are assured by using like metals during corrosion removal operations (e.g., regular carbon steel wool shall never be used to remove corrosion from aluminum alloys as it will embed in the aluminum alloy surface and cause galvanic corrosion). 11.4 NON-POWERED TOOLS AND MATERIALS. Below is a list of several non-powered tools and materials commonly used in the process of corrosion removal. For a complete list of tools and materials procurement information refer to Appendixes A and B in TO 1-1-691. 11.4.1 Abrasive Mats. Abrasive mats are made from a nylon mesh material impregnated with various grades of aluminum oxide. Abrasive mats are available in 9 x 11 inch sheets under A-A-58054, Type I, Class 1, Grade A - Very Fine (280-400 grit), Grade B - Fine (180 grit), and Grade C - Medium (100-150 grit). These mats are used by hand to remove small areas of corrosion and/or paint where the use of powered tools would be impractical or prevented by the shape or accessibility of the area. Use Table 11-2 as a guide to relate abrasive mat materials to coated abrasive paper and/or cloth grit particle sizes. 11.4.2 Abrasive Cloth. Abrasive cloths with bonded aluminum oxide grit per A-A-1048 and silicon carbide grit per A-A- 1200 are used for dry sanding of light to moderate corrosion products. They are available in 9 x 11 inch sheets and 2 or 3 inch wide x 150 foot long rolls in 240 grit (fine) and 320 grit (very fine) grades. 11.4.3 Abrasive Paper. Heavy paper with silicon carbide grit bonded to it per A-A-1047 is used for either wet or dry sanding to remove light to moderate corrosion. It is available in 9 x 11 inch sheets in 240 grit (Fine) and 320 grit (Very Fine) grades. Silicon carbide is usually more effective than aluminum oxide on harder metals such as low carbon and corrosion resistant steel alloys. Other abrasive paper and cloth with bonded emery or flint are available, but they suffer from poor efficiency and short working life. 11.4.4 Wire Brushes. Wire brushes are available with carbon steel, stainless steel (CRES), aluminum, and brass bristles and are used to remove heavy corrosion deposits and flaking paint that are not tightly bonded to the metal surface. Densely set, short, stiff bristles are most effective for rapid corrosion removal. The metallic bristles must be compatible with the metal surface being treated to prevent galvanic corrosion with stainless steel (CRES) being considered neutral and usable on all metals. Do not use brushes with a bristle wire gauge or diameter above 10.0 mils (0.010 inch), as severe gouging of the surface may occur and lead to stress risers that can cause stress and fatigue cracking. Remove the corrosion with a linear motion; do not cross-hatch as this will unnecessarily damage the surrounding surface area. After wire brushing, the surface areas must be polished with fine abrasive paper to remove and/or smooth out any gouges and scratches. 11.4.5 Scrapers. Scrapers are used primarily for the initial removal of heavy corrosion deposits such as flaking rust and exfoliation blisters, and are particularly effective in corners and crevices that cannot be reached with other equipment. 11-2
TO 1-1-700 11.4.5.1 Scrapers may be locally manufactured from phenolic plastic, fiberglass, aluminum alloys, plain carbon steel, carbide-tipped carbon steel, or stainless steel (CRES). Plastic and fiberglass scrapers may be used on any type of metal surface but are of limited value due to their softness relative to a metal surface. Stainless steel (CRES) and carbide-tipped carbon steel scrapers may be used on any type of metal surface. Aluminum alloy scrapers may be used only on aluminum or magnesium alloy surfaces. Plain carbon steel scrapers may be used only on carbon steel surfaces. 11.4.5.2 Scrapers made from copper or brass alloys shall never be used on any structural metal surface as galvanic corrosion will result. Failure to use the correct metal scraper can also lead to galvanic corrosion after the part is returned to service. Surface areas must receive further finishing after corrosion removal with scrapers due to the gouging action of scrapers and the difficulty in determining complete corrosion removal after their use. 11.5 POWER TOOLS AND MATERIALS. Power tools are used to remove heavy corrosion from localized areas on metal surfaces or mild to severe corrosion over large surface areas. Their use results in saving time and money, but care must be exercised when using power tools. Application of excessive pressure can easily damage metal surfaces and cause internal metallurgical changes in the metal due to excessive heat buildup. Refer to Appendixes A and B in TO 1-1-691 for procurement information. Table 11-1. Recommended Powered Abrasives for Corrosion Removal Alloy Flap Brush, Abrasive Wheels (1) Abrasive Cloth/ Paper (2) Abrasive Blasting Parameters Media (3) Pressure (PSI) Other Tools Aluminum alloys (Clad) Aluminum oxide or silicon carbide Aluminum oxide or silicon carbide Glass beads (Sizes 10- 13) or (AGB-15, 12, 9, or 6) 30-40 (4) None Aluminum alloys (Non-clad) Aluminum oxide or silicon carbide Aluminum oxide or silicon carbide Glass beads (Sizes 10- 13) or (AGB-15, 12, 9, or 6) 40-45 (4) Rotary files (fine fluted) Magnesium alloys Aluminum oxide or silicon carbide Aluminum oxide or silicon carbide Glass beads (Sizes 10- 13) or (AGB-15, 12, 9, or 6) 10-35 (4) Rotary files (fine fluted) Ferrous metals (other than stainless steel) Aluminum oxide or silicon carbide Aluminum oxide or silicon carbide Aluminum oxide (Type 1, Grade A or B); Glass beads (sizes 10-13) or (AGB-15, 12, 9, or 6); Steel shot # S110 or S70; Steel grit #G200 or G325 40-50 (4) 40-50 (4) Rotary files, Wire wheels (steel or stainless steel) Stainless steel and Nickel alloys Aluminum oxide or silicon carbide Aluminum oxide or silicon carbide Glass beads (Sizes 10- 13) or (AGB-15, 12, 9, or 6) (see Note 5) 40-50 (4) Wire wheels (stainless steel) Rotary files (fine fluted) Copper alloys DO NOT USE POWERED ABRASIVE METHODS DUE TO TOXICITY OF RESIDUE/ PARTICLES GIVEN OFF - IN PARTICULAR FROM BERYLLIUM-COPPER ALLOYS. 11-3
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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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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
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
Page 194 and 195: TO 1-1-700 Table 11-1. Recommended
Page 196 and 197: TO 1-1-700 11.6 3M CO. SCOTCH-BRITE
Page 198 and 199: TO 1-1-700 11.11.2 Control of Mecha
Page 200 and 201: TO 1-1-700 11.12.2 Mechanical Damag
Page 202 and 203: TO 1-1-700 MIL-DTL-81706 (ALODINE),
Page 204 and 205: TO 1-1-700 11.13.2.3 Application of
Page 206 and 207: TO 1-1-700 only when there is no da
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Page 212 and 213: TO 1-1-700 11.13.7.2 Treatment of C
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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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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