ASTM D1730-2009(2014) Standard Practices for Preparation of Aluminum and Aluminum-Alloy Surfaces for Painting《涂漆铝和铝合金表面预处理的标准实施规程》.pdf
《ASTM D1730-2009(2014) Standard Practices for Preparation of Aluminum and Aluminum-Alloy Surfaces for Painting《涂漆铝和铝合金表面预处理的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM D1730-2009(2014) Standard Practices for Preparation of Aluminum and Aluminum-Alloy Surfaces for Painting《涂漆铝和铝合金表面预处理的标准实施规程》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D1730 09 (Reapproved 2014)Standard Practices forPreparation of Aluminum and Aluminum-Alloy Surfaces forPainting1This standard is issued under the fixed designation D1730; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、 the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 These practices cov
3、er four types of treatment for prepa-ration of aluminum and aluminum-alloy surfaces for painting,as follows:1.1.1 Type ASolvent Cleaning.1.1.2 Type BChemical Treatments.1.1.3 Type CAnodic Treatments.1.1.4 Type DMechanical Treatments. These four typescover a number of procedures, as described herein.
4、1.2 Variations in surface treatment produce end conditionswhich differ, and which do not necessarily yield identicalresults when paints are applied. Service conditions will dictatethe type of surface preparation that should be selected, al-though the quality produced by any individual method mayvary
5、 with different alloys.1.3 This standard may involve hazardous materials,operations, and equipment. This standard does not purport toaddress all of the safety concerns, if any, associated with itsuse. It is the responsibility of the user of this standard toestablish appropriate safety and health pra
6、ctices and deter-mine the applicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D609 Practice for Preparation of Cold-Rolled Steel Panelsfor Testing Paint, Varnish, Conversion Coatings, andRelated Coating Products2.2 Military Standards:3MIL-A-8625 Anodic Coa
7、tings forAluminum andAluminumAlloysMIL-DTL-5541 Chemical Conversion Coatings on Alumi-num and Aluminum AlloysMIL-M-10578B Metal Conditioner and Rust Remover(Phosphoric Acid Type)MIL-P-15328bB Coating Compound Metal PretreatmentResin Resistant2.3 Federal Specification:3TT-C-490 Chemical Conversion Co
8、atings and Pretreatmentsfor Ferrous Surfaces (Base for Organic Coatings)3. Type ASolvent Cleaning3.1 Solvent cleaning does not disturb the natural oxide filmon the metal and may prove adequate for some applications,such as ambient indoor or very mild service conditions. Threemethods may be employed,
9、 as follows:3.1.1 Method 1, Manual Swabbing or Dip-Washing, with asolvent such as mineral spirits or high-flask solvent naphtha.With this method it is extremely difficult to prevent accumu-lation of contaminants on the swab or in the solvent. Thismethod is only recommended when other treatments arei
10、mpractical.3.1.2 Method 2, Solvent Spray Cleaning , in accordancewith Method A, Procedure 1 of Practice D609.3.1.3 Method 3, Vapor Degreasing , in special equipmentemploying trichloroethylene vapor, in accordance with MethodA, Procedure 2 of Practice D609.4. Type BChemical TreatmentsNOTE 1Materials
11、and procedures employed in these methods oftreatment are available from a number of sources as proprietary com-pounds or methods. Selection may be made from available sources. Thehexavalent chromium methods given are not recommended as hexavalentchromium is a known carcinogen.4.1 Method 1, Alkaline
12、CleanersAlkaline solutions, suchas caustic soda, etch the metal, thus destroying the naturaloxide film. They are followed by an acid treatment, preferablynitric acid or phosphoric acid. They shall not be used onassembled structures. Inhibited alkaline cleaners are sometimesemployed as a pretreatment
13、 to remove grease and oil prior to anacid treatment. Inhibited alkaline cleaners do not etch the1These practices are under the jurisdiction ofASTM Committee B08 on Metallicand Inorganic Coatings and is the direct responsibility of B08.07ConversionCoatings on Chromate Conversion Coatings.Current edit
14、ion approved Nov. 1, 2014. Published November 2014. Originallyapproved in 1960. Last previous edition approved in 2009 as D1730-09. DOI:10.1520/D1730-09R14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of AST
15、MStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshoho
16、cken, PA 19428-2959. United States1surface. They are not generally recommended unless followedby a conversion treatment, such as described in Methods 4, 5,6, or 7.4.2 Method 2, Sulfuric Acid, Chromium Trioxide EtchThis treatment provides a clean and uniform surface withoutundue etching, and is effec
17、tive for removing oil and waterstains and any film formed during heat-treatment. The etchingsolution is prepared by adding 1 gal (3.78 L) of concentratedsulfuric acid and 45 oz (1.28 kg) of chromium trioxide to 9 gal(34 L) of water. It is used at a temperature of 160 to 180F (71to 82C) (depending on
18、 the alloy and the amount of film) forabout 5 min and is followed by a water rinse. This treatmentproduces a passive surface suitable for painting under mild tointermediate exposure conditions and where clear finishes areto be applied.4.3 Method 3, Alcoholic Phosphoric Acid CleanerThistreatment invo
19、lves the use of an aqueous solution of phos-phoric acid (10 to 15 volume %) with alcohol or other organicsolvents, together with wetting agents, emulsifying agents, etc.The solution may be applied by swabbing or dipping at roomtemperature (70 to 90F (21 to 32C), and should be allowedto remain on the
20、 surface for several minutes, followed bythorough rinsing with clean water. A very thin phosphate filmis formed which tends to protect the metal and promote paintadhesion under mild to intermediate exposure conditions.NOTE 2U.S. Military Specification MIL-M-10578B describes a treat-ment of this type
21、.4.4 Method 4, Crystalline Phosphate TreatmentThissurface-coating method consists in reacting the aluminumsurface in a zinc-acid-phosphate solution containing oxidizingagents and other salts for accelerating the coating action. Thealuminum surface is converted to a finely crystalline, phos-phate coa
22、ting of the proper texture adapted to inhibit corrosionand increase the adherence and durability of any applied paintfilm. It is recommended for product finishes. The phosphatecoating process may be carried out by immersion or sprayapplication. The aluminum surface is converted to the phos-phate coa
23、ting by immersion in the processing solution for 30 sto 4 min at 125 to 140F (51 to 60C), or by spraying thesolution for 10 s to 2 min at 125 to 160F (51 to 71C).NOTE 3Before applying the treatments according to Methods 4, 5, 6,and 7 of Type B, the aluminum surfaces should be freed of grease, oil, o
24、rother foreign material by means of the procedure described in Method 3of Type A, Method 1 of Type B, or any other suitable method.NOTE 4This treatment complies with the requirements of U.S. FederalSpecification TT-C-490.4.5 Method 5, Amorphous Phosphate TreatmentThis pro-cess comprises treatment of
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