ASTM_B_117_-_16.pdf

Designation:B11716Standard Practice forOperating Salt Spray(Fog)Apparatus1This standard is issued under the fixed designation B117;the number immediately following the designation indicates the year oforiginal 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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This practice covers the apparatus,procedure,andconditions required to create and maintain the salt spray(fog)test environment.Suitable apparatus which may be used isdescribed in Appendix X1.1.2 This practice does not prescribe the type of test speci-men or exposure periods to be used for a specific product,northe interpretation to be given to the results.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.4 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:2B368 Test Method for Copper-Accelerated Acetic Acid-SaltSpray(Fog)Testing(CASS Test)D609 Practice for Preparation of Cold-Rolled Steel Panelsfor Testing Paint,Varnish,Conversion Coatings,andRelated Coating ProductsD1193 Specification for Reagent WaterD1654 Test Method for Evaluation of Painted or CoatedSpecimens Subjected to Corrosive EnvironmentsE70 Test Method for pH of Aqueous Solutions With theGlass ElectrodeE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodG85 Practice for Modified Salt Spray(Fog)Testing3.Significance and Use3.1 This practice provides a controlled corrosive environ-ment which has been utilized to produce relative corrosionresistance information for specimens of metals and coatedmetals exposed in a given test chamber.3.2 Prediction of performance in natural environments hasseldom been correlated with salt spray results when used asstand alone data.3.2.1 Correlation and extrapolation of corrosion perfor-mance based on exposure to the test environment provided bythis practice are not always predictable.3.2.2 Correlation and extrapolation should be consideredonly in cases where appropriate corroborating long-term atmo-spheric exposures have been conducted.3.3 The reproducibility of results in the salt spray exposureis highly dependent on the type of specimens tested and theevaluation criteria selected,as well as the control of theoperating variables.In any testing program,sufficient repli-cates should be included to establish the variability of theresults.Variability has been observed when similar specimensare tested in different fog chambers even though the testingconditions are nominally similar and within the ranges speci-fied in this practice.4.Apparatus4.1 The apparatus required for salt spray(fog)exposureconsists of a fog chamber,a salt solution reservoir,a supply ofsuitably conditioned compressed air,one or more atomizingnozzles,specimen supports,provision for heating the chamber,and necessary means of control.The size and detailed con-struction of the apparatus are optional,provided the conditionsobtained meet the requirements of this practice.4.2 Drops of solution which accumulate on the ceiling orcover of the chamber shall not be permitted to fall on thespecimens being exposed.4.3 Drops of solution which fall from the specimens shallnot be returned to the solution reservoir for respraying.4.4 Material of construction shall be such that it will notaffect the corrosiveness of the fog.1This practice is under the jurisdiction of ASTM Committee G01 on Corrosionof Metals and is the direct responsibility of Subcommittee G01.05 on LaboratoryCorrosion Tests.Current edition approved March 15,2016.Published April 2016.Originallyapproved in 1939.Last previous edition approved in 2011 as B117 11.DOI:10.1520/B0117-16.2For 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 4.5 All water used for this practice shall conform to Type IVwater in Specification D1193(except that for this practicelimits for chlorides and sodium may be ignored).This does notapply to running tap water.All other water will be referred toas reagent grade.NOTE1Water used with a conductivity 1.0 S/cm(or resistivity 1.0Mcm)may cause damage to some equipment due to the reactive natureof the water.In addition,it may cause issues with stabilizing pHmeasurements.5.Test Specimens5.1 The type and number