ASTM D1731-2009 Standard Practices for Preparation of Hot-Dip Aluminum Surfaces for Painting《涂漆用热浸铝表面制备用标准实施规程》.pdf
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1、Designation: D 1731 09Standard Practices forPreparation of Hot-Dip Aluminum Surfaces for Painting1This standard is issued under the fixed designation D 1731; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision
2、. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 These practices describe procedures for the preparationof hot-dip aluminum surfaces for painting.1.2 This standard may involve haza
3、rdous materials, opera-tions, 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 practices and deter-mine the applicability of regulatory l
4、imitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 609 Practice for Preparation of Cold-Rolled Steel Panelsfor Testing Paint, Varnish, Conversion Coatings, andRelated Coating Products2.2 Military Standards:3MIL-DTL-5541 Chemical Conversion Coatings on Alumi-num and Aluminum AlloysM
5、IL-C-15328 Specification for Acid Wash PrimersMIL-M-10578B Metal Conditioner and Rust Remover(Phosphoric Acid Type)3. Types of Surface Preparations3.1 Two types of surface preparations are covered as fol-lows:3.1.1 Solvent Cleaning, and3.1.2 Chemical Treatments.3.2 These two types cover several meth
6、ods as described inSection 5. Variations in surface treatment produce end condi-tions which differ and which do not necessarily yield identicalresults when paints are applied. Service conditions will dictatethe type of surface preparation that should be selected.4. Solvent Cleaning4.1 The surfaces m
7、ay be prepared for painting by any of themethods for solvent cleaning described in 4.2 and 4.3.4.2 Method 1Manual swabbing or dip washing with asolvent such as mineral spirits or high flask solvent naphtha. Itis extremely difficult to produce a clean metal surface by thismethod. Accumulated contamin
8、ants in the solvent or on theswab are frequently redeposited on the surface being prepared.4.3 Method 2Solvent spray cleaning in accordance withMethod A, Procedure 1 of Practice D 609.4.4 Method 3Vapor degreasing in special equipment inaccordance with the latest revision of Method A, Procedure 2of P
9、ractice D 609, employing trichlorethylene or perchloreth-ylene vapor. Solvent cleaning does not disturb the natural oxidefilm on the metal and may prove adequate for some applica-tions.5. Chemical Treatment5.1 The surfaces may be prepared for painting by any of themethods for chemical treatment (Not
10、e 1) described in 5.2 to5.9:NOTE 1Materials 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 i
11、s a known carcinogen.5.2 Method 1, Alkaline CleanersEtching alkaline solu-tions, such as caustic soda, should be avoided because of thepossibility of dissolving away the aluminum coating therebyexposing the base metal. Since inhibited alkaline cleaners donot etch the surface, they can be used to rem
12、ove grease, oil, andother organic solids from hot dip aluminum. After alkalicleaning, the surface should be thoroughly rinsed with cleanwater. Most often alkaline-cleaned surfaces are subsequentlyprocessed by one of the following methods, described in5.3-5.9.5.3 Method 2, Alcoholic Phosphoric Acid C
13、leanersThistreatment involves the use of an aqueous solution of phospho-ric acid with alcohol or other organic solvents, together withwetting agents, emulsifying agents, etc. The solution may beapplied by swabbing or dipping (preferably at a temperature of70 to 90F (21 to 32C). The solution should r
14、emain on the1These practices are under the jurisdiction ofASTM Committee B08 on Metallicand Inorganic Coatings and is the direct responsibility of Subcommittee B08.07 onConversion Coatings.Current edition approved April 15, 2009. Published May 2009. Originallyapproved in 1960. Last previous edition
15、approved in 2003 as D 1731 03.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Standardization
16、 Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-50981Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.surface for several minutes, followed by thorough rinsing withclean water. A very thin pho
17、sphate film is formed which tendsto protect the metal and promote paint adhesion.NOTE 2Materials meeting the requirements of the latest revision ofU.S. Military Specification MIL-M-10578B may be used.5.4 Method 3, Acid Fluoride DeoxidizerThis treatmentincludes the use of nitric or sulfuric acid with
18、 chromiumtrioxide and a fluoride. It provides a clean and uniform surfacewithout undue roughening and is effective for removinginorganic soils and any film formed during the production ofthe hot dip aluminum. The deoxidizing solution is generallyused at a temperature of 70 to 130F (21 to 54C) (depen
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