1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Te
3、l: +1 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS79_015 AEROSPACE MATERIAL SPECIFICATION AMS79-015 Issued 2017
4、-12 Compound, Cleaning Gel for Aircraft Surfaces RATIONALE This Standard is a direct replacement for DEF STAN 79-15, Issue 2 and has been reproduced by SAE International under D/IPR Agreement D/IPR/04/CR-0239-17-0008. The technical content remains unchanged from Issue 2 of the Defence Standard it su
5、persedes. Any queries should be referred via the link shown in the feedback box at the bottom of this page. LICENSING AGREEMENT Ministry of Defence Crown Copyright 2017. Data is reproduced with permission of the Controller, Her Majestys Stationery Office. The phrases “DStan“ and “Def Stan“, and the
6、DStan logo, are registered trademarks of the Ministry of Defence. FOREWORD REVISION NOTE This Defence Standard was raised to Issue 2 to update its content and incorporate the latest MoD/DStan policy in place at the time. HISTORICAL RECORD This Standard supersedes the following: TS 10304A dated 23 No
7、vember 1988 Interim Def Stan 79-15 Issue 1 dated 11 May 1994 AMENDMENT ISSUED SINCE PUBLICATION Amendment 1, 6 February 2004, Clause 4, page 5 Revision Note: Test methods have been updated to reflect current procedures and terminology. SAE INTERNATIONAL AMS79-015 Page 2 of 20 TABLE OF CONTENTS 1. SC
8、OPE 3 2. WARNING . 3 3. RELATED DOCUMENTS . 3 4. DESCRIPTION 4 5. STORAGE LIFE 4 6. TEST METHODS 4 6.1 Test Conditions . 4 6.2 Composition 4 6.3 Condition . 4 6.4 Viscosity 4 6.5 Test Requirements 4 7. CONTAINERS AND MARKING OF CONTAINERS . 6 8. NOTES 6 8.1 Revision Indicator 6 ANNEX A STABILITY 7 A
9、NNEX B FREEDOM FROM CRAZING ACTION . 8 ANNEX C DETERMINATION OF EASE OF RINSING 11 ANNEX D DETERMINATION OF CLEANING POWER 12 ANNEX E FREEDOM FROM CORROSIVE ACTION . 15 ANNEX F REMOVAL OF RESIDUE AFTER DRYING 16 ANNEX G FREEDOM FROM DAMAGE 17 ANNEX H EFFECT OF REPEATED CLEANING 18 ANNEX J STRESS COR
10、ROSION CRACKING 19 ANNEX K REMOVAL OF TEMPORARY CAMOUFLAGE PAINT . 20 Table 1 Test requirements . 5 SAE INTERNATIONAL AMS79-015 Page 3 of 20 1. SCOPE This SAE Standard specifies requirements for a gelled compound for cleaning the soiled exterior of service aircraft. The cleaning gel may be applied b
11、y pressure pump as a thixotropic liquid, by brushing or by swabbing. The surfaces to be cleaned may be unpainted metal or surfaces painted with glossy or matt schemes, including strippable acrylic paint complying with DTD 5599. This Standard includes tests to limit specific forms of corrosion that a
12、ffect aircraft structural materials. 2. WARNING This section which appeared in DEF STAN 79-15 Issue 2 has been deliberately deleted. 3. RELATED DOCUMENTS 3.1 Reference is made in this Standard to: BS EN ISO 1513 Paints and Varnishes. Examination and Preparation of Samples for Testing BS EN ISO 1519
13、Paints and Varnishes, Bend Test (Cylindrical Mandrel) BS EN ISO 3696 Water for Analytical Laboratory Use. Specification and Test Methods BS EN 605 Paints and Varnishes. Standard Panels for Testing BS EN 2395 Aluminium Alloy AL-P2014A-T4 or T42. Sheet and Strip 0.4 mm a 6 mm BS 1449 Steel Plate, Shee
14、t and Strip: Part 1 Carbon and Carbon-Manganese Plate, Sheet and Strip BS 1595 Propan-2-ol (Isopropyl Alcohol) for Industrial Use BS 3370 Specification for Wrought Magnesium Alloys for General Engineering Purposes. Plate, Sheet and Strip BS 3900 Methods of Test for Paints Part A13: Test for Flash/no
15、 Flash (Rapid Equilibrium Method) Part D8: Determination of Colour and Colour Difference: Principles Part D9: Determination of Colour and Colour Difference: Measurement Part D10: Determination of Colour and Colour Difference: Calculation Part E2: Mechanical Tests on Paint Films: Scratch Test BS 5690
16、 Method for Determination of Abrasion Resistance of Fabrics BS 2L 95 Specification for Plate of Aluminium-zinc-magnesium-copper-chromium Alloy (Solution Treated, Controlled Stretched and Precipitation Treated) (Zn 5.8, Mg 2.5, Cu 1.6, Cr 0.15) BS 2L 500 Procedure for Inspection and Testing of Wrough
17、t Magnesium-base Alloys BS X 33 Two Component Epoxy Primer for Aerospace Purposes BS X 34 Air Drying, Two Component, Polyurethane Finish for Aerospace Purposes SAE INTERNATIONAL AMS79-015 Page 4 of 20 Def Stan 03-19 Electro-deposition of Cadmium AMS03-19 Electro-deposition of Cadmium Def Stan 68-10
18、Corrosion Preventive, Water Displacing NATO Code C-634 Joint Service Designation: PX-24 Def Stan 80-128 Paint, Finishing, Temporary Camouflage, Alkali Removable Def Stan 91-98 Lubricating Oil, Gas Turbine Engine, Synthetic Grade 7.5 cSt NATO Code 0-149 Joint Service Designation OX-38 DTD 911 Protect
19、ion of Magnesium-rich Alloys against Corrosion DTD 5592 Acrylic Sheets for Aircraft Glazing DTD 5599 Selectively Strippable Acrylic Finishing Schemes - Matt and Glossy - for Use on Aircraft ASTM G47 Determining Susceptibility to Stress-corrosion Cracking of High-strength Aluminium Alloy Products 3.2
20、 This section which appeared in DEF STAN 79-15 Issue 2 has been deliberately deleted. 3.3 This section which appeared in DEF STAN 79-15 Issue 2 has been deliberately deleted. 4. DESCRIPTION The cleaning gel shall be a homogeneous gelatinous compound, free from abrasive matter, visible impurities and
21、 objectionable odor. The residues of the material in the effluent resulting from aircraft cleaning shall not interfere with the biological treatment of sewage, assuming a final dilution of 4000:1 v/v. 5. STORAGE LIFE The cleaning gel, when stored in its original sealed containers at a temperature be
22、tween 5 C and 35 C, shall retain the properties described in this Standard for a period, from the date of dispatch by the manufacturer, of not less than 24 months. 6. TEST METHODS 6.1 Test Conditions Unless otherwise specified, all tests shall be carried out at 23 C 2 C. 6.2 Composition Samples take
23、n from any portion of the supply shall be of the same formulation as that of the original test sample. 6.3 Condition When the material in the original containers or in the laboratory sample containers is examined in accordance with BS EN ISO 1513, it shall conform to Section 4. 6.4 Viscosity The mat
24、erial as supplied shall be suitable for both brush and spray application. 6.5 Test Requirements A sample taken from any portion of the supply shall comply with the requirements of Table 1. If any sample is found not to conform to the requirements of this Standard, the whole batch may be rejected. SA
25、E INTERNATIONAL AMS79-015 Page 5 of 20 Table 1 - Test requirements Test Number Property Requirement Method of Test 1 Stability Shall yield a solution or mixture stable for at least 24 hours and free from insoluble precipitate matter Annex A 2 Freedom from crazing action No crazing Annex B 3 Ease of
26、rinsing No signs of visible residue, pink discoloration not greater than the control Annex C 4 Cleaning power Not inferior to the reference gel by visual assessment Annex D 5 Freedom from corrosive action Increase in mass, 1 mg maximum Decrease in mass, 5 mg maximum No signs of etching, pitting or f
27、ormation of adherent deposits Annex E 6 Flashpoint 55 C minimum BS 3900: Part A13 7 Removal of residue after drying No visible residue, change in mass not greater than the control using standard hard water Annex F 8 Freedom from damage a. Bend test: The paint system shall not become detached or dama
28、ged b. Scratch test: The needle shall not penetrate the topcoat Annex G 9 Cleaning power (laboratory) dEd value no lower than the reference gel Annex D 10 Cleaning power (field trial) To the satisfaction of the Customer Practical aircraft cleaning trial 11 Repeated cleaning Any damage not greater th
29、an the control using standard hard water Annex H 12 Stress corrosion cracking No stress corrosion cracking Annex J 13 Removal of temporary camouflage paint Complete removal Annex K SAE INTERNATIONAL AMS79-015 Page 6 of 20 7. CONTAINERS AND MARKING OF CONTAINERS 7.1 Unless the form of packaging is sp
30、ecified in the contract or order, the cleaning gel shall be supplied in sound, clean and dry containers suitable for the product. The use of contaminated containers may render the whole consignment liable to rejection. After filling, each container shall be securely closed. 7.2 Each container shall
31、be legibly and durably marked according to legal and statutory requirements and with at least the following details: Designation viz: COMPOUND CLEANING GEL FOR AIRCRAFT SURFACES AMS79-015 Distinctive batch number: Contract or order number: Quantity of contents: Date of manufacture: Date of dispatch:
32、 Manufacturers name, initials or recognized trade mark: Any additional markings called for in the contract or order 8. NOTES 8.1 Revision Indicator A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have
33、been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY
34、 AMS COMMITTEE “J” SAE INTERNATIONAL AMS79-015 Page 7 of 20 ANNEX A - STABILITY A.1 REAGENTS Standard hard water: Calcium acetate anhydrous 0.32 g 0.005 g Magnesium sulfate heptahydrate 0.28 g 0.005 g Dissolve the calcium acetate and magnesium sulfate in 1 dm3of water complying with BS EN ISO 3696 G
35、rade 3 (boiled and cooled). A.2 PROCEDURE Dilute the cleaning gel 1:4 v/v with the standard hard water, leave to stand for 24 hours and then examine. A.3 REPORTING Report any insoluble precipitate matter formed, or separation of the mixture. SAE INTERNATIONAL AMS79-015 Page 8 of 20 ANNEX B - FREEDOM
36、 FROM CRAZING ACTION B.1 APPARATUS Air-circulating oven capable of maintaining 93 C 3 C Humidity cabinet capable of maintaining 23 C 2 C and 50% 5% relative humidity Panels of nominal dimension 180 mm x 25 mm cut from clear polymethylmethacrylate (PMMA) cast sheet, nominal thickness 6 mm, complying
37、with DTD 5592 Jig for holding the panel across a fulcrum (see Figure B1) Stirrups for holding weights Lint or other absorbent fabric B.2 PROCEDURE B.2.1 Remove the protective paper from the panel by soaking in water and smooth the edges of the panel by abrading in the direction of the longest edge o
38、n a sheet of 220 grade silicon carbide paper. B.2.2 Cut a groove 2 mm radius parallel to the short edge and 15 mm from one end of the panel. This may be conveniently done by clamping two panels together and drilling a 4-mm diameter hole at the interface (see Figure B2). B.2.3 Anneal the panels by he
39、ating in an air-circulating oven at 93 C 3 C for 3 hours and then allow to cool at a rate of 27 C hour-1 5 C hour-1to 23 C 2 C. Condition the panel for at least a further 16 hours at 23 C 2 C and 50% 5% relative humidity (RH). B.2.4 Measure the width and thickness of the panels to the nearest 0.1 mm
40、 at a point 65 mm 1 mm from the non-grooved end of the panel. B.2.5 Mount the test panel in the jig and place a 20-mm square piece of lint or other absorbent fabric soaked in the undiluted cleaning gel on top of the panel immediately above the fulcrum (see Figure B1). B.2.6 Place the stirrup in the
41、groove and load to produce a stress of 21 MPa. The load used shall be calculated for each individual test panel from the following formula: Lg6btSm2= (Eq. B1) where: m = total mass required in kg S = stress in MPa b = width of panel in mm t = thickness of panel in mm L = distance from the groove to
42、fulcrum in mm g = gravitational acceleration m/s-2SAE INTERNATIONAL AMS79-015 Page 9 of 20 Under the conditions of the test, this reduces to: 3210bt569.3m= (Eq. B2) or 2.280btm2= (Eq. B3) (For a test panel of exact dimensions, m = 3.212 kg) B.2.7 Allow the panel to remain under stress for a period o
43、f 8 hours, keeping the lint or absorbent fabric moistened with the undiluted cleaning gel. B.2.8 Remove weights and the panel from the jig and examine the panel for crazing using oblique lighting. Ignore slight crazing initiated at the edges of the panel. B.3 REPORTING Report whether there is any cr
44、azing. Figure B1 - Loading configuration Lint (20 x 20) soaked in test cleaner1090-15-00150 100 15ClampClampFulcrum support 12 diaStirrupLOAD (m kg)Dimensions in mmSAE INTERNATIONAL AMS79-015 Page 10 of 20 1090-15-0024ClampClampFigure B2 - Method of drilling grooves SAE INTERNATIONAL AMS79-015 Page
45、11 of 20 ANNEX C - DETERMINATION OF EASE OF RINSING C.1 APPARATUS Rose spray with a substantially flat face, approximately 125 mm in diameter and drilled with 75 to 80 holes of 1 mm diameter distributed evenly across the face. A convenient configuration is a central hole surrounded by 5 n holes on e
46、ach of five concentric circles of radius 11 n where n ranges from 1 to 5. The apparatus shall be capable of maintaining a pressure of approximately 14 kN m-2at the rose face and ensuring that the cleaning gel under test is above the level of the drainage water. Two panels 100 x 100 mm of acid chroma
47、te pickled hard aluminum complying with and prepared in accordance with BS EN 605 and coated with a paint scheme complying with and applied in accordance with BS X 33 Type B primer with a finish to BS X 34 Type B (matt white). Allow the painted panels to dry for not less than 28 days at 23 C 2 C and
48、 50% 5% RH after application of the final coat. Dropping pipette C.2 REAGENT Phenolphthalein/propan-2-ol indicator solution 1 g in 100 cm3C.3 PROCEDURE C.3.1 Apply the cleaning gel to the painted surface of one of the panels at a spreading rate of approximately 250 g m-2and allow the panel to remain
49、 in a horizontal attitude for 10 minutes. C.3.2 Operate the rose spray apparatus and place the panel under the water shower at an angle of 45 with the lower edge 375 mm below the rose for 2 minutes. C.3.3 Remove the panel and apply, by pipette, a copious amount of the phenolphthalein indicator solution to the painted surface of the panel. C.3.4 Repeat the procedure using the other panel as
