1、Designation:F142892(Reapproved 2011)Standard Specification forAluminum Particle-Filled Basecoat/Organic or InorganicTopcoat,Corrosion Protective Coatings for Fasteners1This standard is issued under the fixed designation F1428;the number immediately following the designation indicates the year oforig
2、inal adoption or,in the case of revision,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.1.Scope1.1 This specification covers the basic requirements for acorrosion-resist
3、ant coating consisting of an inorganic alumi-num particle-filled basecoat and an organic or inorganictopcoat,depending on the specific requirements.1.2 The coating may be specified with basecoat only,or withthe top coated with compatible organic polymer or inorganictopcoats,depending on the specific
4、 requirements.1.3 The basecoat is a water-dilutable slurry containingaluminum particles dispersed in a liquid binder of chromate/phosphate compounds.1.4 The organic topcoats consist of polymer resins anddispersed pigments and are for service where temperatures donot exceed 230C(450F).1.5 The inorgan
5、ic topcoats consist of ceramic oxide pig-ments dispersed in a liquid binder of chromate/phosphatecompounds and are for service where temperatures do notexceed 645C(1200F).1.6 These coatings are applied by conventional dip/spin,dip/drain,or spray methods.1.7 The coating process does not normally indu
6、ce hydrogenembrittlement,provided that the parts to be coated have notbeen subjected to an acid cleaner or pretreatment(see Note 1).NOTE1Although this coating material contains water,it has arelatively low susceptibility to inducing hydrogen embrittlement in steelparts of tensile strengths equal to
7、or greater than 1000 MPa(approxi-mately RC31).Normal precautions for preparing,descaling,and cleaningsteels of these tensile strengths must be observed.An initial stress relieftreatment should be considered prior to any chemical treatment orcleaning operation.Acids or other treatments that evolve hy
8、drogen shouldbe avoided.Mechanical cleaning methods may be considered.Some steelsare more susceptible to hydrogen embrittlement than others and may alsorequire hydrogen embrittlement relief baking after cleaning but beforecoating.Since no process can completely guarantee freedom fromembrittlement,ca
9、reful consideration must be given to the entire coatingprocess and the specific steel alloy employed.1.8 The coating systems defined by this specification can beapplied to ferrous alloy steels,aluminum,and ferritic andaustenitic stainless steels.1.9 The values stated in SI units are to be regarded a
10、s thestandard.The values given in parentheses are for informationonly.1.10 The following safety hazards caveat pertains only tothe test methods portion,Section 6,of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the respons
11、ibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2.Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray(Fog)ApparatusB487 Test Method for Measurement of Metal and
12、OxideCoating Thickness by Microscopical Examination ofCross SectionB568 Test Method for Measurement of Coating Thicknessby X-Ray SpectrometryD1186 Test Methods for Nondestructive Measurement ofDry Film Thickness of Nonmagnetic Coatings Applied toa Ferrous Base(Withdrawn 2006)3D2247 Practice for Test
13、ing Water Resistance of Coatings in100%Relative HumidityD3359 Test Methods for Measuring Adhesion by Tape TestE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or ProcessE376 Practice for Measuring Coating Thickness byMagnetic-Fiel
14、d or Eddy-Current(Electromagnetic)Test-ing Methods1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.03 on Coatings onFasteners.Current edition approved Nov.1,2011.Published May 2012.Originallyapproved in 1992.Last pre
15、vious edition approved in 2005 as F1428 92(2005).DOI:10.1520/F1428-92R05.2For 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 w
16、ebsite.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.Classification3.1 The inorganic aluminum particle-filled basecoat and thesubsequent topcoats are classified into three groups,withsubsequent subgroups formed according to the requirementsgiven in Table 1.The coating bath requirements and curetemperatures recommended by the chemical manufacturersh
