抗石击 标准PSA_D241312

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PSA PEUGEOT - CITROËN

Méthodes d'essai matériaux

D24 1312

PAINT COATINGS RESISTANCE TO CHIPPINGPage 1/10 NO USE RESTRICTIONThis is a translation, the French original shall be used in all cases of litigation Date of translation: 25/11/2003

1.OBJECT AND FIELD OF APPLICATIONThe object of this method is to assess the resistance to chipping of a paint coating, single or mutli-coats applied to a metal or plastic substrate.

2.PRINCIPLEThe chipping test consists of projecting a determined mass of specified metal granules, at an angle of incidence, with a well defined output and energy, on the paint coating applied to a test specimen. The same test specimen is subjected to a second chipping test identical to the previous one after it has been submerged in water at 40°C for a duration of 24 hours. The resistance to chipping is then evaluated, after application of adhesive tape, by the dimension of flakes their density and optionally by the number of impacts reaching the substrate.

3.EQUIPMENT AND REAGENT3.1.CONDITIONED ENCLOSUREAt 23°C± 2°C and with no hygrometry requirements.

3.2.METAL GRANULE BLASTING EQUIPMENT,According to the schematic diagram of the equipment shown in Appendix 1, marketed by the ERICHSEN company, reference VDA 508. This equipment must be modified in such a way that the test specimens to be chipped are at a right angle to the axis of projection of the metal granules. Detailed drawings of this modification can be obtained by simple request to the"PEINTURES" (Paints) department of DPTA/DMOV/MXP at VELIZY. Note: The precision of the manometer, with which it is equipped, must be of± 0,1 bar.

3.3.GRANULES,Quenched cast iron of“diamond” shape, to a ROCKWELL hardness of between 61 and 65 angular in form and with a mean diameter of 4 mm to 5 mm, marketed by the ERICHSEN company.

3.4."FORD" TANK,Conforms to that used in test method D27 1327.

3.5.PLATES,In sheet steel or aluminium or in plastic, defined in standards documents relating to paints applied on these substrates, with minimal dimensions of 85 mm x 85 mm.

OR: 01/05/1980 D: 20/05/2003

General use

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3.6.ADHESIVETAPE,

ConformstothatusedintestmethodD251075.

3.7.BALANCE,

Witharangeof2kg,accuratetowithinonegram.

3.8.CHRONOMETER

3.9.DE-IONISEDWATER,

Availableinthelaboratory,withresistivity>200000 /cmwhenthetankisassembled.

Thisistoberenewedweekly.

4.PREPARATIONOFTESTSPECIMENS

BORATORYTESTSPECIMENS

Usethesheetsteeloraluminiumorplasticplates(3.5.).

Theseplatesreceivetherangeofpaintsforwhichresistancetochippingisbeingassessed.

Recordalltheparameterslinkedwiththecompleterangeofpaints:surfacetreatment,thicknessofeachcoat,stovingtemperatureetc…

4.2.SAMPLINGOFTESTSPECIMENSFROMPARTS

Whentheresistancetochippingofpaintedpartshastobeassessedforexample:doors,bonnets,plasticparts,cutouttestspecimensofatleast50mmx50mmintheflattestareaofthepart,radiusofcurvatureexceeding1metre,whiletakingcaretonotgeneratestressesoutsidetheedgesofthespecimen.

Ifthedimensionsofthistestspecimenarelessthan85mmx85mm,bondthetestspecimentoasteelplatewithminimumdimensionsof85mmx85mm.

Inthecasewherenorelativelyflattestspecimencanbecutoutfromthepart,forexampleantirollbar,torsionbar,wiperbrush,rim…,exposethepart,oraportionofthepartdirectlyinfrontoftheprojectionwindow(3.2.).

Acoveradaptedtothegeometryofeachpartmustbeappliedbehindthepartandonthewindowoftheequipment(3.2.)topreventgranulesfrombeingprojectedoutsidetheequipment

Orequally,2ormoreparts,placedsidebyside,maybeusedtoblankthewindow;andavoidusingacoverifthisisamorepracticalmethod.

4.3.CONDITIONINGOFTESTSPECIMENS

Paintedtestspecimensmustbeconditionedintheenclosure(3.1.)foratleast16hours.

Note:Inthecaseofpaintscurableatatemperaturebelow120°C,the16hourconditioningmustonlybecarriedout7daysafterthepainthasbeenappliedtothetestspecimens.

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5.METHODOFOPERATION

Connecttheblastingequipment(3.2)tothecompressedairnetworkwithaminimumpressureof6barandmaximumpressure10bar.

Applythevoltageandensurethattheairreservoirisadequatelyfilled.

5.1.CALIBRATIONOFEQUIPMENT

Protectthetestspecimenfixingsystembyfittingametalplate.

Withthesolenoidvalveopen,setthecompressedairpressureto1bar±0,1bar(unlessotherwisespecified).

Raisethewindowby10mm,usedasapartitionbetweenthehopperandtheaccelerationtube,toallowtheflowofmetalgranules.

Pour500g±1gofmetalgranules(3.3.)intothehopper.

Switchontheequipment.

Startthechronometer(3.8.)assoonasthefirstmetalgranulesfallintotheaccelerationtube.

Stopthechronometerassoonasthelastmetalgranuleshavedisappearedandrecordthetimeelapsed. Iftheflowtimeisdifferentfrom10s±1s,increaseordecreasethespeedofflowbymeansoftheknobprovided.

Repeattheoperationuntiltheflowtimeofthemetalgranulesisequalto10s±1s.

5.2.TEST

5.2.1.Fixthetestspecimenpreviouslyconditioned,accordingto§4.3.,ontotheequipmentsupport(3.2.).Duetothenoisemadeasaresultofthetest,theequipmentisoftenlocatedoutsideoftheconditionedenclosure.Inthiscase,ensurethatlessthan5minuteselapsesbetweenthepartbeingremovedfromtheconditionedenclosureandthebeginningofthetest.

5.2.2.Pour500gofmetalgranules(3.3.)intothehopperandfixtotheequipment(3.2.)thetrayforcollectingthemetalgranules.

5.2.3.Switchontheequipmentuntilthemetalgranuleshavecompletelypassedthrough.

5.2.4.Stoptheequipment,thenremovethetestspecimenfromthesupport.

5.2.5.Submergefor24hours±1hour,thetestspecimeninthetank(3.4.),fillwithde-ionisedwater(3.9.)andthermostaticallycontrolledto40°C±1°C.

5.2.6.Proceedtoasecondchippingoperation,between1and1½hourafterthespecimenhasbeenremovedfromthetank(3.4.),followingtheproceduredescribedin§5.2.1.to5.2.4.inclusive.

5.2.7.Whentheequipment(3.2.)isnottobeusedforthenext24hours,itmustbeswitchedoffandtheairreservoiremptied.

5.2.8.Applyadhesivetape(3.6.)overthewholechippedsurfaceandpeelitofffollowingtheprocedureasindicatedin§METHODOFOPERATIONoftestmethodD251075.

5.3.QUALITYANDSAFETYCONTROL

5.3.1.QualityControl

Theprojectiontubeforthemetalgranulesmustbeinspectedyearly.

Theedgesoftheshotframewindow,PSAPEUGEOTCITROËNmodificationoftheoriginalequipment,mustshownodefects.

ethetestcounterfittedtotheblastingequipment.

Thepressure,weightofgranules,andtimetakenforthegranulestopassthrougharetobecheckeddaily,priortobeginningthetest.

5.3.2.Safety

Itisrecommendedtoswitchofftheblastingequipment(3.2.)andemptytheairreservoirwhenthetestingisstoppedforlongerthan24hours.

Theoperatormustwearnoiseprotectionequipmentduringtesting.

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6.EXPRESSIONOFRESULTS

Aftertesting,theresistancetochippingofthetestspecimenistobeestimatedaccordingtothreecriteria,oneofwhichisoptional.

6.1.GRADINGOFTHESIZEOFFLAKING

Thisgradingcorrespondstonumbers1to6oftherepresentativephotographsshowninAppendix2,withthesurfaceareaofthelargestflakesidenticaltothoseonthelargestflakesonthetestspecimen.

Ifthesurfaceofthelargestflakesonthetestspecimenisbetweentwoofthegradesshown,thenanintermediategrademaybeused.

Example:Surfaceofthelargestflakesonthetestspecimenisbetweengrades3and4→grading3/4.Note:

Eliminatesystematicallythelargestflakeonthetestspecimenanddonottakeintoaccountflakessituatedlessthan5mmfromanedge.

Whenalargeflakeiscausedbythegroupingofmanysmallerflakes(manyimpactsclosetooneanother),donottakeintoaccount,forthegrading,thelargeflakingareabutassesswhichgradingwouldhavebeenallocatedtotheflakesiftheimpactshadbeenmoreapartfromoneanother.

Remark:Concernsonlygradings1,2and3.

Markingswithnoflakingonthepaintcoatingduetothepermanentdeformationofaplasticsubstratemustnotbeconsideredtobeflaking.

Theplateswhichshownoflaking,butonlymarkings,correspondtograde1.

6.2.DENSITYOFFLAKING

Counttheflakespresentonthetestspecimen,thesurfaceareaofwhichisbetweenthatofthelargestflakesonthegradingobtainedaccordingto§6.1GRADINGOFTHESIZEOFFLAKING,andthatofthelargestflakesontheimmediatelylowergrading,donottakeintoaccountflakesonasmallerarea;letnbethisnumber.

2Ifthesurfaceofthetestspecimenexposedtochippingisdifferentfrom0,64dm,surfaceofthewindowofthe

equipment(3.2.).

2CalculatethenumberofflakesNrelatingtoasurfaceareaof0,64dm,accordingtothefollowingrelationship:

N=n.0,64

S

Inwhich:n=Numberofflakespresentoverthewholetestspecimen,

S=Surfaceofthetestspecimenexposedtochippingexpressedinsquaredecimetres.

Gradethedensityofflakes,lettersAtoE,accordingtothefollowingtable:Grading

A

B

C

D

En(orNifS≠0,64dm2)1to910to2425to7475to150>150

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6.3.NUMBEROFIMPACTSTOREACHTHEMETALLICSUBSTRATE

(optional)

ThegradingofthenumberofimpactsreachingthemetalsubstratemustbeexpressesinconformitywithtestmethodD295342.

6.4.EXAMPLEOFGRADING

Thegradingoftheresistancetochippingmustbeexpressedbythethreegradingstogether,thethirdbeingoptional,definedin§6.1.,6.2.and6.3.,inthatorder.

Example:3C2

7.MEASUREMENTUNCERTAINTY

Theevaluationoftheresistancetochippingisagradingmethod:themeasurementuncertaintycannotbedefined.

8.TESTREPORT

Aswellastheresults,thetestreportmustinclude:

thereferencetothismethod,

thereferencetothepart,inthecaseofatestspecimenbeingsampledfromapart,

thetypeofsubstrate,

thedetailedrangeofpaintappliedtothetestspecimen,referenceoftheproducts,nameofsuppliers,thicknessapplied,etc…,

thestovingconditionsforthelaboratorytestspecimens,aswellasforspecimenstakenfromparts,ifthedataisavailable.

Theoperationaldetailsnotspecifiedinthemethodaswellasanyincidentslikelytoaffecttheresults.

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APPENDIX1

SCHEMATICDIAGRAMOFTHEEQUIPMENT

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APPENDIX2(1/3)

GRADINGSCALE

NUMBER1

NUMBER2

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APPENDIX2(2/3)

GRADINGSCALE(continued)

NUMBER3

NUMBER4

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APPENDIX2(3/3)

GRADINGSCALE(continued)

NUMBER5

NUMBER6

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9.RECORDSANDREFERENCEDOCUMENTS

9.1.RECORDS

9.1.1.CREATION

OR:01/05/1980–CREATIONOFTHEPSANORME.REPLACESTHEPEUGEOTNORMENo.1312

9.1.2.OBJECTOFTHEMODIFICATION

D:20/05/2003–UPDATEOFTHETESTMETHOD.

C:28/03/1997-INTRODUCEDINTOIDEM(Frenchonly).

9.2.REFERENCESDOCUMENTS

9.2.1.PSADOCUMENTS

9.2.1.1.Normes

D251075

D271327

D295342PAINTCOATINGS–CROSSHATCHTESTPAINTCOATINGS–RESISTANCETOIMMERSIONINWATER(FORDTANK)PAINTCOATINGSONMETALLICSUPPORTS-HIGHLIGHTINGANDGRADINGOFIMPACT

REACHINGTHESUPPORT

9.2.1.2Others

9.2.2.EXTERNALDOCUMENTS

9.3.EQUIVALENTTO:

9.4.CONFORMSTO:

9.5.KEY-WORDS

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