TO 1-1-700 - Robins Air Force Base

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TO 1-1-700 NOTE SEMCO PASA-JELL 101, CHEMICAL CORROSION REMOVAL FOR STAINLESS STEEL (CRES) AND NICKEL BASED ALLOYS 64 This process is for DEPOT AND OTHER AUTHO- RIZED FACILITY use only. 11.13.4.2.3 Acid Pickling for Corrosion Removal. Acid pickling solutions consisting of a mixture of A-A-59105 (O- N-350) Nitric Acid, MIL-A-24641 Hydrofluoric Acid, and water are used to remove corrosion/rust from removed stainless steel (CRES) and nickel based alloy parts that can be immersed in the solution. MIL-C-10578, COMPOUND, CORROSION REMOVING AND METAL CONDITIONING 20 A-A-59105 (O-N-350), NITRIC ACID 4 • Scale loosening, pickling, and passivation solutions are all strong acids which are toxic to the skin, eyes, and respiratory tract. Chemical splash proof goggles and/or face shield and chemical resistant rubber gloves and aprons are required. • In case of eye or skin contact, flush immediately with water and report to the Base Medical Facility. MIL-A-24641, ACID, HYDROFLUORIC 17 11.13.4.2 Chemical Corrosion Removing Materials for Stainless Steel (CRES) and Nickel Based Alloys. There are three types of chemicals used for corrosion removal from stainless steels (CRES) and nickel based alloys: Semco® Pasa-Jell 101 gel type mineral acid material; MIL-C-10578, Type III inhibited phosphoric acid based solution; and acid pickling solutions consisting of a mixture of A-A-59105 (O- N-350) Nitric Acid, MIL-A-24641 Hydrofluoric Acid, and water. 11.13.4.2.1 Semco® Pasa-Jell 101. This is a gel type mineral acid material used for chemical corrosion removal from assembled equipment structures in areas involving LOX storage and gaseous oxygen transfer systems and other areas where a gel type material is necessary and/or preferred. The directions for the application and use of this material are found in Chapter 5 of TO 1-1-691. 11.13.4.2.2 MIL-C-10578, Type III Corrosion Removing and Metal Conditioning Compound (Phosphoric Acid Base)/Inhibited. This is a phosphoric acid based material that can be used to remove corrosion from assembled equipment structures in areas that do not contain oxygen systems and where a liquid material is acceptable. The directions for the application and use of this material are found in Chapter 5 of TO 1-1-691. • Avoid inhaling fumes, and provide adequate ventilation. • Solution tanks shall be properly ventilated with a lateral exhaust type ventilation system. • The ventilation system and procedure shall be properly evaluated by the Bioenvironmental Engineer prior to initial use. • When preparing pickling solutions, never pour water into the acids as excessive heat will be generated. Always pour the acids into the water. • Rubber lined or Koroseal tanks shall be used to hold these solutions because they are so highly acidic. Heat-treatable stainless steel alloys, such as AISI types 403, 410, 420, and others, are susceptible to cracking when placed in pickling solutions. Use only mechanical methods to remove corrosion from these alloys. 11.13.4.2.3.1 Pickling Solution Concentration. Pickling solutions are prepared by mixing various amounts of A-A- 11-18
TO 1-1-700 59105 (O-N-350), Nitric Acid, and MIL-A-24641, Hydrofluoric Acid, in water. The correct content of the two acids for a given corrosion removal job is determined by the testing procedure outlined below. The nitric acid content may vary from 5 to 50% by volume, while the hydrofluoric acid content may vary from 0.5 to 5% by volume. A solution of 12 to 15% nitric acid by volume and 1% hydrofluoric acid by volume in water is normally used to remove light scale and/or corrosion/rust. Increase the percentage of hydrofluoric acid within the range specified above to remove heavier scale and/or corrosion/rust. As the amount of nitric acid increases with respect to the amount of hydrofluoric acid in the solution, the rate of corrosion/rust and/or scale removal decreases, because nitric acid inhibits the action of hydrofluoric acid. 11.13.4.2.3.2 Pickling Solution Temperature. The temperature of the pickling solution may be adjusted from ambient/room temperature up to a maximum of 140 °F (60 °C). Higher temperatures shall be avoided to reduce evaporation loss of hydrofluoric acid. Use temperatures below 120 °F (49 °C) if intergranular attack is experienced in localized areas, such as weld zones. NOTE AISI 300 series stainless steel (CRES) alloy tubing may be used to manufacture steam coils to heat the solution. The heating coils should be installed so that they are easily replaced, since they will be corroded by the solution over time. 11.13.4.2.3.3 Testing for Optimum Pickling Conditions. Optimum pickling conditions (temperature, time, and acid concentration) shall be determined by exposing test panels to various combinations of these parameters and processing them through the entire cleaning and corrosion removal/pickling cycle. Excessive etching and/or intergranular attack of the base metal indicates conditions are too aggressive, and slow removal rates indicate conditions are not aggressive enough. a. Make four inch square test panels from the same material from which the parts that will be treated are made. Process these test panels through the complete cleaning and corrosion removal/pickling cycle. b. If etching or intergranular attack is excessive (i.e., would cause the component to be condemned), or if corrosion removal is not complete, adjust the acid concentration, immersion time, and/or solution temperature until the desired result is obtained. Table 5-9 in Chapter 5 of TO 1-1-691 shows the effect that varying the parameters of acid concentration, immersion time, and/ or solution temperature has on the corrosion removal/ pickling action of the solution. 11.13.4.2.3.4 Application and Use of Acid Pickling Solutions for Corrosion Removal. The directions for the application and use of nitric acid-hydrofluoric acid solutions for corrosion removal are found in Chapter 5 of TO 1-1-691. 11.13.5 Copper and Copper Based Alloys. These paragraphs outline chemical corrosion removal procedures for copper and copper based alloy parts and assemblies of aircraft, missiles, and equipment. Table 5-10 in Chapter 5 of TO 1-1- 691 provides procedures for removing specific types of corrosion. 11.13.5.1 Preparation. If the corroded area is contaminated with grease, oil, dirt, or other foreign materials; clean the area per Chapter 7 of this manual. Protect adjacent components and areas not being treated by masking to prevent damaging them with the chemicals used. MIL-C-10578, COMPOUND, CORROSION REMOVING AND METAL CONDITIONING 20 A-A-55828 (O-S-809), SULFURIC ACID SOLUTIONS 3 11.13.5.2 Chemical Corrosion Removing Materials for Copper and Copper Based Alloys. There are two types of chemical solutions used for corrosion removal from copper and copper based alloys provided there is no danger of chemical entrapment in crevices and/or recesses: MIL-C-10578, Type III Corrosion Removing and Metal Conditioning Compound (Phosphoric Acid Base)/Inhibited solution and A-A- 55828 (O-S-809) Sulfuric Acid solution. 11.13.5.2.1 MIL-C-10578, Type III Corrosion Removing and Metal Conditioning Compound (Phosphoric Acid Base)/Inhibited. This is a phosphoric acid based material used to remove corrosion from assembled copper and/or copper alloy equipment structures in areas that do not contain oxygen systems and where a liquid material is acceptable. The directions for the application and use of this material are found in Chapter 5 of TO 1-1-691. 11.13.5.2.2 A-A-55828 (O-S-809) Sulfuric Acid Solutions. This process is restricted to DEPOT LEVEL maintenance only. Sulfuric acid solutions may be used to remove corrosion from copper and/or copper alloy components which can be disassembled and treated in immersion tanks. The tanks must be either manufactured from or lined with stainless steel 11-19
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TO 1-1-700 TECHNICAL MANUAL CORROSI
Page 3 and 4:
TO 1-1-700 TABLE OF CONTENTS Chapte
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TO 1-1-700 TABLE OF CONTENTS - CONT
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Page 13 and 14:
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
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 192 and 193: TO 1-1-700 (2) If allowable damage
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
Page 210 and 211: TO 1-1-700 (CRES), lead, ceramic, g
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
Page 224 and 225: TO 1-1-700 used to apply sealants i
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
Page 232 and 233: TO 1-1-700 below and adhere very po
Page 234 and 235: TO 1-1-700 Table 12-2. Time Require
Page 236 and 237: TO 1-1-700 Table 12-2. Time Require
Page 238 and 239: TO 1-1-700 of 20 to 25 seconds in a
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
Page 250 and 251: 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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