TO 35-1-3 - Robins Air Force Base

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TO 35-1-3 or equivalent devices, to fog or spray the CPC MIL-PRF- 16173, Grade 4 or (MIL-PRF-81309 Type II), onto the interior surfaces of the hollow members ensuring complete interior coverage. Depot overhaul or contractor maintenance shall condition the interior of aluminum hollow members per TO 1-1-691 with a chromate conversion coating per MIL- DTL-5541, Class 1A or anodize per MIL-A-8625, Type II or III. The specific treatment shall depend on the alloy. Apply the appropriate CPC, as above, after the pretreatment operations. 3.16 COATING APPLICATIONS. 3.16.1 Material Selection. To provide optimum protection from deterioration and corrosion, the proper coating system (a combination of cleaning, pretreatment, priming and topcoat) must be selected for a specific application. See Table 3-1 for authorized coating systems. Table 3-2 is a brief abstract of the priming and painting functions necessary to maintain the coating systems on SE. Table 3-2. Pretreatment Instructions Material A. FERROUS ALLOYS other than stainless steel, mill-galvanized or mill-electrozinc coating, or mill-aluminized surfaces. Finish Process 1. Chemically clean the areas in accordance with Chapter 3. Remove all remaining coating and corrosion by abrasive blasting or other mechanical cleaning processes. Field organizations without abrasive blasting capabilities may proceed to Step 3. Depot and/or contractor level of maintenance apply zinc phosphate TT-C-490, Type I. 2. The blasted surfaces will be in a near-white condition per Steel Structures Painting Council (SSPC-SP 10). A near-white blast cleaned surface finish is defined as one from which all oil, grease, dirt, mill scale, rust, corrosion products, oxides, paint or other foreign matter have been completely removed from the surface except for very light shadows, very slight streaks, or slight discolorations caused by rust stain, mill scale oxides, or slight, tight residues of paint or coating that may remain. At least 95% of each square inch of surface area shall be free of all visible residues, and the remainder shall be limited to the light discoloration mentioned above. The National Association of Corrosion Engineers (NACE) Standard TM-01-70 (Visual Standard for Surfaces of New Steel Airblast Cleaned with Sand Abrasive) surface was produced as a visual standard to compare properly prepared surfaces. The Standard may be procured from NACE International, 440 South Creek Drive, Houston, TX 77084-4906. The blast-cleaned surface must be primed before any rusting occurs, otherwise the benefit of the near-white blast cleaning is lost. Under normal atmospheric conditions it is best practice to prime within one hour of blast cleaning. The following areas are exceptions to blasting: a. Abrasive blasting will not be performed on surfaces where there is a danger of warping or distorting the base metal. Sheet metal thinner than 0.0625 inch (U.S. Standard 16 gauge) will not be abrasive blasted. b. Parts whose dimensions must be retained or parts with deep crevices, threads, or machined surfaces will not be abrasive blasted. c. Heavy cast iron or tempered steel components such as engines, transmissions, gearboxes, differentials, leaf or coil springs, etc., shall not be abrasively blasted. d. Working surfaces that are to be lubricated. 3-10
TO 35-1-3 Table 3-2. Pretreatment Instructions Material A. FERROUS ALLOYS other than stainless steel, mill-galvanized or mill-electrozinc coating, or mill-aluminized surfaces. (Continued) Finish Process 3. Primer - The preferred coating system over abrasive blasted ferrous alloys is a zinc-rich primer and intermediate primer system. The primers will be applied in a “wet-to-wet” process. The basecoat zinc-rich primer, (MIL-PRF-26915) is applied and the intermediate primer (MIL-DTL-53030) is applied shortly thereafter over the zinc-rich primer. Follow the coating manufacturers' application instructions for the mixing, delays between the primer application and the required application equipment. The base coat zinc-rich primer shall conform to MIL-PRF-26915. Dry film thickness of the zinc-rich primer should be 2.0 - 2.5 mils. The intermediate primer shall conform to MIL-DTL-53030. Dry film thickness for MIL-DTL-53030 shall be 0.9 to 1.1 mils. If the surface is not reconditioned to bare metal, the use of a non-chromate tie-coat is recommended. Apply MIL-PRF-23377, Type I, Class N or MIL-DTL-53022, Type II over the areas to be painted. 4. Topcoat - Paint with one coat of MIL-PRF-85285, Type I applied to a dry film thickness of 1.6 to 2.4 mils. B. STAINLESS STEEL AND NICKEL BASE ALLOYS. 1. Most stainless steel surfaces do not require finishing. If there are requirements in the equipment specific technical order to coat stainless steel, and the technical order provided the coating procedures those instructions shall take precedence. If no instructions are available and coatings are required use the following application processes. 2. Clean in accordance with Chapter 2, if the surface remains contaminated refer to TO 1-1-691. 3. Passivate the surface in accordance with SAE-AMS-QQ-P-35 (Depot or Contractor levels of maintenance only). 4. Primer - MIL-DTL-53022, Type II (Lead and Chromate Free, Epoxy Primer). Allow the primer to dry. Dry film thickness for MIL-DTL-53022, Type II primed surfaces shall be 0.9 to 1.1 mils. 5. Finish - Paint with one coat of MIL-PRF-85285 applied to a dry film thickness of 1.6 to 2.4 mils. Total dry film thickness of all coatings: MIL-DTL-53022, Type II primed surfaces shall be 2.5 to 3.5 mils. C. MAGNESIUM ALLOYS. 1. Clean in accordance with Chapter 2, if the surface remains contaminated refer to TO 1-1-691. 2. Pretreat with dichromate film per SAE-AMS-M-3171, Type III. 3. Primer - Prime with one coat of epoxy primer, MIL-PRF-23377, Type I, Class 2. Dry film thickness for MIL-PRF-23377 primed surfaces shall be 0.6 to 0.8 mils. 4. Finish - Finish with one coat of MIL-PRF-85285 applied to a dry film thickness of 1.6 to 2.4 mils. Total dry film thickness of all coatings: MIL-PRF-23377 primed surfaces shall be 2.2 to 3.2 mils. Change 8 3-11
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TO 35-1-3 TECHNICAL MANUAL CORROSIO
Page 3 and 4:
TO 35-1-3 TABLE OF CONTENTS Chapter
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TO 35-1-3 TABLE OF CONTENTS - Conti
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TO 35-1-3 LIST OF ILLUSTRATIONS Num
Page 9 and 10: TO 35-1-3 FOREWORD 1. PURPOSE. The
Page 11 and 12: TO 35-1-3 SAFETY SUMMARY 1. GENERAL
Page 13 and 14: CHAPTER 1 CORROSION THEORY, IDENTIF
Page 15 and 16: TO 35-1-3 Table 1-1. Galvanic Serie
Page 17 and 18: TO 35-1-3 sion. Improper dilution o
Page 19 and 20: TO 35-1-3 1.6.7.3 When dry, some mi
Page 21 and 22: TO 35-1-3 Figure 1-7. Example of Pi
Page 23 and 24: TO 35-1-3 Figure 1-11. Illustration
Page 25 and 26: TO 35-1-3 1.8 METALS AFFECTED BY CO
Page 27 and 28: TO 35-1-3 CHAPTER 2 CLEANING 2.1 GE
Page 29 and 30: TO 35-1-3 E Table 2-1. Wash Interva
Page 31 and 32: TO 35-1-3 Table 2-1. Wash Interval
Page 34 and 35: TO 35-1-3 2.1.5.3 Immersion in clea
Page 36 and 37: TO 35-1-3 2.1.6.2.10 MIL-PRF-87937,
Page 38 and 39: TO 35-1-3 Table 2-2. Authorized Cle
Page 40 and 41: TO 35-1-3 2.1.7.2 Cleaning Compound
Page 42 and 43: TO 35-1-3 removal and surface treat
Page 44 and 45: TO 35-1-3 2.2.6.1 Authorized HPW Eq
Page 47 and 48: TO 35-1-3 CHAPTER 3 PAINTING, SEALI
Page 49 and 50: TO 35-1-3 3.3.2.3.1 Unless otherwis
Page 51 and 52: TO 35-1-3 Table 3-1. Authorized Coa
Page 53 and 54: TO 35-1-3 3.5.2.3 Air Force will ac
Page 55 and 56: TO 35-1-3 with AMS 3367, Class A or
Page 57 and 58: TO 35-1-3 3.11 MAINTENANCE STAND RA
Page 59: TO 35-1-3 b. Type III An ultra thin
Page 63 and 64: TO 35-1-3 b. Azko Nobel 10P3-2 Akzo
Page 65 and 66: TO 35-1-3 removed prior to the fina
Page 67 and 68: TO 35-1-3 3.22.1 SE Undercoating Co
Page 69: TO 35-1-3 3.26.7 Wire Harness and C
Page 72 and 73: TO 35-1-3 4.2.3.4 Other optional in
Page 74 and 75: TO 35-1-3 Figure 4-3. Sample Mobili
Page 76 and 77: TO 35-1-3 Legend for Figure 4-4. In
Page 88 and 89: TO 35-1-3 Legend for Figure 4-10. I
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TO 35-1-3 Legend for Figure 4-21. I
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TO 35-1-3 Pages 4-46 and 4-47 were
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TO 35-1-3 Legend for Figure 4-53 -
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TO 35-1-3 Figure 4-54. New Generati
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TO 35-1-3 Figure 5-1. Angle Iron Se
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TO 35-1-3 87937, Type I), which con
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TO 35-1-3 • Gas Tungsten-Arc (TIG
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TO 35-1-3 CHAPTER 7 SOUTHWEST ASIA
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TO 35-1-3 7.2.2.1.6 Felt-Soundproof
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TO 35-1-3 Table A-1. Equipment and
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TO 35-1-3 Nomenclature/Description
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TO 35-1-3 - Robins Air Force Base

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