ASTM_G_33_-_99_2015.pdf

Designation:G3399(Reapproved 2015)Standard Practice forRecording Data from Atmospheric Corrosion Tests ofMetallic-Coated Steel Specimens1This standard is issued under the fixed designation G33;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers a procedure for recording data ofatmospheric corrosion tests of metallic-coated steel specimens.Its objective is the assurance of(1)complete identification ofmaterials before testing,(2)objective reporting of materialappearance during visual inspections,and(3)adequatephotographic,micrographic,and chemical laboratory examina-tions at specific stages of deterioration,and at the end of thetests.1.2 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA428/A428M Test Method for Weight Mass of Coating onAluminum-Coated Iron or Steel ArticlesE376 Practice for Measuring Coating Thickness byMagnetic-Field or Eddy-Current(Electromagnetic)Test-ing MethodsG46 Guide for Examination and Evaluation of Pitting Cor-rosion3.Significance and Use3.1 Use of this practice will maximize the benefits to begained from atmospheric testing of metallic-coated steel.It willalso aid in comparing results from one location to anotherwhere similar tests have been conducted.4.Data to be Recorded Before Testing4.1 Material Characteristics:4.1.1 Coating and Basis Metal:4.1.1.1 Type of coating(zinc,aluminum,nickel-chromium,and so forth).4.1.1.2 Method of application(hot-dip,electroplated,electroless,mechanical plated,and so forth),(1)Area coated(if not 100%of surface),(2)Pre-treatment(basis metal:flux,sand-blast,and soforth),and(3)Post-treatment(heating,sealing,and so forth),4.1.1.3 Coating composition,4.1.1.4 Basis metal product.(1)Basis metal composition,and(2)Metallurgical history prior to coating(if any).4.1.1.5 Chemical treatment of coating.4.1.1.6 Black and white photograph of typical surface areaillustrating texture(1:1 magnification ratio).4.1.1.7 Micrograph of typical coating cross section(magni-fication and etchant to be specified).4.1.2 Coating Weight and Thickness:4.1.2.1 Weight by stripping.(See Test Method A90/A90Mor A428/A428M.)(1)Method.4.1.2.2 Measured Thickness.(1)Method(for example,eddy current,back scattering,magnetic),NOTE1If a magnetic type instrument is used,refer to Practice E376.(2)Number of determinations,(3)Mean,(4)Standard deviation,and(5)Range(spread of determinations).4.2 Specimen Identification and Exposure Location:4.2.1 Marking(method to be specified).4.2.2 Specimen position in test area.4.2.3 Angle of exposure from horizontal.4.2.4 Direction of specimen faces.4.2.5 Location of test area.4.2.6 Description of test area(location of nearby industry,ocean,and so forth,and recorded data on specific contaminantswhere possible).1This practice is under the jurisdiction of ASTM Committee G01 on Corrosionof Metals and is the direct responsibility of Subcommittee G01.04 on AtmosphericCorrosion.Current edition approved Nov.1,2015.Published November 2015.Originallyapproved in 1972.Last previous edition approved in 2010 as G3399(2010).DOI:10.1520/G0033-99R15.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.2.7 Exposure starting date:4.2.7.1 Weather conditions(for example,bright,cloudy,sunshine,rain,and so forth),4.3 Specimen Characteristics:4.3.1 Description(sheet,wire,hardware,and so forth).4.3.2 Specimen size:4.3.2.1 Specimen surface dimensions.4.3.2.2 Gage or thickness.4.3.3 Specimen weight(when applicable).4.3.4 Edge condition(to be specified).4.3.5 Specimen preparation(method of cleaning).4.3.6 Surface appearance(verbal description,color,texture,and so forth)(see 5.3).5.Data to be Recorded During Field Inspections5.1 Specimen Identification:5.1.1 Marking.5.1.2 Position in test area.5.2 Exposure Period and Location:5.2.1 Location.5.2.2 Inspection date.5.2.2.1 Weather conditions(for example,bright,cloudy,sunshine,rain,and so forth).5.3 Specimen Appearance(Top and Bottom Sides Should beRated Separately):5.3.1 Color:5.3.1.1 Hueshould be described by the following terms:red,orange,yellow,green,blue,violet,white,brown,gray,andblack.Combination colors should be d