FROSIO考试99个问问答Word文件下载.docx

FROSIO考试99个问问答Word文件下载.docx

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waterandpartlyoxygen

6.Doseacoatingheavilypigmentedwithzincphosphateprovidecorrosionprotectionbythe

galvanicprinciple?

No,byinhibitorprinciple

7.Whyisasurfaceprofileimportanttoadhesionofacoatingsystem?

Itenlargertheareatocontact,providinganchorage

8.Howdowechecksurfacesforametalcleanlinessofsa3ensurethatallsolublesubstancesare

removedfromthesurface?

AccordingtoISO8502-6andISO8502-9.

Sampling（“Breslemethod”）andmeasuretheconductivity.

9.Willblastingsteelsurfacetoametalcleanlinesssa3ensurethatallsolublesubstancesare

No,itcanonlyremovepartly.

Freshwaterwashingwilldoit.

10.Whatmustbedonetothesteelsurfacebeforegrinding?

Steelpreparationfirst（removingweldslag/weldspatter,chippingofflamination）,then

removingoil/greaseand/orwatersolublesubstancesbysolventcleaningand/orHPWwashing

11.Whyisasteelsurface,whichhasbeenburnishedthroughrotarywirebrushingnotavery

goodsurfacetoapplypaint?

Itistoomuchsmooth,thereisnogoodadhesionbetweenthecoatingandthesurface

12.Whatisthefunctionofamoistureseparatoronacompressor?

Toseparatewaterfromthecompressedair

13.Whatistheeffortofincreasingthedistancefromtheblastnozzletothesurface?

Itwilllosskineticenergy（shallowroughness/poorblasting）

14.Whichangle（theblastingnozzletosurface）shouldyouselectwhenblastingoffmostpartsof

thick,whichiswelladhesionepoxymasticsystem?

45to60degreeangle

15.Whatproblemconnectedtothepaintsystem’sservicelifecanyougetifyouuseaninhibitor

inconnectingwithwaterjetting?

Givelaterosmoticblisteringandaffecttheadhesionbetweenthepaintandthesubstrate.

16.Iswaterjettingsuitedforprimarysurfacepreparation?

Ifyouthinkso,pleasestatewhy?

If

youthinknot,pleasestatewhy?

No,itisonlysuitedforsecondarysurfacepreparation,becauseitdosenotcreategood

surfaceroughness

17.If,afterblasting,flashrustappearsrathermorequicklythanusual,whatcouldindicate?

Thereiswatersolublesubstanceonsurface;

thereiscondensationonsurface;

thehumidityis

high

18.WhatisthelowersliquidpressureaccordingtothejointSSPC/NACEstandardthatis

designatedwaterjetting

70Mpa（10000psi）

19.Whatislaitance?

Itistheoutercrustoffreshlycastconcrete.

20.Wherecanyoufindinformationsuchasthepotlifeofacoating?

Intheproductdatasheet.

21.Whenpaintsarestoredforlongperiodsoftime,whatcomponentsettlestothebottom?

Thepigmentwillsettletothebottom

22.Howcanyougetridofairthathasbeenmixedintoliquidpaintbeforeapplication?

Putisawhile,theairwillreleasetheairbyitselfintheinductiontime

23.Whateffectsdothetemperaturehasonthepotlifeofpaint?

Ifthetemperatureincrease,thepotlifewillreduce;

ifthetemperaturereduce,thepotlifewill

increase.

24.Whenwouldyouuseamoisture/oiltrapbetweenanaircompressorandthepressurepotinan

airsprayunit?

Themoisture/oiltrapwouldbealwaysusedwhenyouanairsprayunit

25.Whydosepaint“wraparound”tothesidesandthebackofanobjectduringelectrostaticspray

application?

Thepaintisgivenanelectrostaticcharge（usu.negative）,theobjectisearthed,thenegative

chargedpaintparticlesareattractedtoallpartsofobjectandthebuildupofpaintisespecially

goodonedges.

26.Whatdegreeofmetalcleanlinessisrequiredforthermalsprayingofametalliccoating,and

whatshouldthesurfaceprofilebe?

Sa3and50-80um

27.Whichmetalsaretheonesmostcommonlyusedinthermalsprayapplication?

Aluminumalloyandzincalloy

28.Whatisinductiontime?

Somepaintsneedtositforawhilepriortouseinorderforthetwocomponentstostart

reacting,thisperiodoftimeiscalledinductiontime

29.Whateffectwillhotweatherhaveonthepotlifeachemicalcuringcoating?

Hotweatherwillshortenthecuringtime

30.Whatisapotlife?

Whenthetwocomponentspaintismixed,itonlyhasashortperiodoftimebetweenthe

Mixingpointandthepointatwhichthepaintcured,cannotbeusedanymore,thisperiodof

Timeiscalledpotlife.

31.Whatisawaterbornecoating?

Inawaterbornecoatingtheorganicsolventsarealmostabsent,andthebinder,informof

smallspheroidsisdispersedinwater.

32.Whateffectwilllowtemperatureandhighhumidityhaveonthedrying/curingofwaterborne

coating?

Therewillbecondensationonthecoatingsurface,thecoatingmaynotdry/cure

33.“waterbornecoatingdosenotcontainanysolventatall”,Isthisacorrectstatement

Thisisnotcorrect.Waterbornecoatingcontainasmallamountofspecialsolvent—

plasticiser（usu.<

6%）

34.WhateffectwillincreasingthesolidscontentofacoatinghaveontheVOClevelofacoating?

TheVOCwillbelowered

35.Whateffectwillthinninghaveonthefilmbuildingpropertiesofacoating?

Itwillleadsagging/runs;

youwillincreasetheWFTinordertoachievethespecifiedDFT

36.WhatdoseSSPC-SP10designate?

Verythroughblastcleaning—nearwhitemetalblastcleaning

（ISOsa21/2）

37.Onaworksiteyoufindthatthewindisblowingsteadilyatapace15milesperhour.Willthis

affectairlesssprayapplicationofzincethylsilicate?

Yes,thevelocityistoohigh.Themaximumpermitis7.2km/hr

38.Whyshouldthesteeltemperatureduringblastingorpaintapplicationbeatleast3*cabovethe

dewpoint?

Avoidcondensationtoensuregoodadhesion

39.Howdowedetermineifablastedsteelsurfacetherequiredmetalcleanlinessornot?

YoucandeterminebyusingthestandardISO8501-1（withphotos）

40.WhatdoesPSa3designate?

Partial（localized）blastingtosa3toapreviouslycoatedsurface.

41.AndPSt2?

partial（localized）handorpowertoolcleaningtost2toapreviouslycoatedsurface.

42.Whatisthedifferencebetweenaspecificationandprocedure?

Aspecificationtellswhatwillbedone,aproceduretellshowwillbedone.

Aspecificationcomprisetheelementsnecessarytodescribetheresultaimedat.

Aproceduremustcoverallaspectsofthework–notonlysurfacepreparationandapplication.

43.“Reportingisdemandedtomakelifedifficultforcoatingadvisersandensurethattheydonot

gotobarsandloosewomen”isthisstatementcorrect?

Pleasejustifyyourviewpoint

regardlessofweatherornotyouagreewiththestatement?

No,Idonotagreewithit.Reportingisveryimportant,everythingshouldbewrittendown

clearlysothatwecanfindthereasonseasilyifsometroubleshappen.

44.Whyisitnecessarytoremovegreasefromasurfacepriortoblastcleaning?

Forblastcleaningwillnotfullyremovethegrease,instead,itwillspotthegreaseeverywhere.

45.Whenyouhaveremovedleadcontainingpaintfromsurfacethroughgrindingshouldyouthen

takeyourworkclotheshomeandwashthembyhands?

No,throwthemaway.

46.Whatistheflashpoint?

Flashpointisthelowesttemperatureatwhichaliquidliberatessufficientvaportoforma

mixturewiththeairnearitssurfacewhich,ifignited,willmakeasmallflash,butnotcatch

fire.

47.Howdowecheckthesurfaceprofileachievedonacleanedsurface?

ComparewithstandardISO8503

48.Howlongshallyoutwirlaslingpsychrometerinordertodeterminethewetanddry

temperature?

Donotstopuntilthetwothermometersstable.

49.Ifyouuseawornnozzleonanairlessspraygun,howwillthisaffectthethicknessofthewet

filmdepositedonthesurfaceascomparedtoanidenticalbutunusednozzle?

Highfilmthickness/maybesagging/orangepeel/

50.Whatshouldyoudoifyourreceiveashipmentofcoatingswhichhaveexceedtheirpotlife?

Returnthemback,reportaccordingly.

51.Whatdowemeanbytheoreticalcoverage?

Itisdefinesastheareaofsurfacethatcanbecoveredatuniformspecifieddryfilmthickness

byaspecifiedunitvolumeofacoatingintheory.

52.Whydowespecifyacertaindryfilmthicknessforacoatofpaint?

PLSlistentotheprofessor.

53.Whatcheckwouldyoubelikelytomaketofindthecauseoffisheyeinapaintfilm?

Oil/grease,silicone,dirt

54.Whatisthemaincausesofthebelowpaintfilmdefects?

Wrinkling:

a.Toothick

b.weathertoowarm

Orangepeel:

a.Painttooviscous

b.guntooclose

c.toofastsolventevaporation

d.toolowairpressure.

Pinhole:

a.Solvent/airpassagethroughthefilm

b.insufficientatomization

c.coarseatomization

d.settledpigment（s）

Dryspray:

a.Guntoofaraway

b.toohighatomization

c.incorrectspraytechnique

d.fall-outfromwind

e.toohighairtemperature

Sagg