GroupstandardVW13750

Issue2018-07

Class.No.:50204

Descriptors:code,corrosion,corrosionprotection,metal,metalpart,rustprotection,surfaceprotection,surface

protectiontype

SurfaceProtectionforMetalParts

SurfaceProtectionTypes,Codes

Previousissues

VW13750:1953-06,1954-07,1956-10,1958-04,1959-03,1959-06,1963-03,1963-05,1966-06,1966-06,1966-10,1967-05,1967-11,1969-10,1970-11,1971-12,1972-02,1974-08,1975-06,

1976-07,1980-09,1983-10,1986-10,1989-12,1991-11,1994-10,1999-04,2005-02,2008-01,2008-06,2014-05,2016-12

Changes

ThefollowingchangeshavebeenmadetoVW13750:2016-12:

–Technicalresponsibilitychanged

–

Section1"Scope"

:Supplement1supersededby

VW13750-1

–

Section3.6"Zincandzincalloycoatings"

:ReferencetoDINENISO4042deletedandsectionrephrased

–

Table2

:AssignmenttoTL240forOfl-b111andOfl-b113deleted(becausetheplannedincor‐porationintoTL240wasrejected)

–

Table2

expandedbyOfl-w626,Ofl-w645,Ofl-w646(allasper

TL182

)

–

Table2

expandedbyOfl-w699asper

TL212

–Section"Applicabledocuments"updated

Alwaysusethelatestversionofthisstandard.

Thiselectronicallygeneratedstandardisauthenticandvalidwithoutsignature.

TheEnglishtranslationisbelievedtobeaccurate.Incaseofdiscrepancies,theGermanversioncontrols.

Page1

of16

Technicalresponsibility

GQL-M/1

Tobias

Schilling

Tel.:

+495361937641

GQL-M/1

Tobias

Uschkurat

Tel.:

+495361944832

GQL-M

Dr.FrankR?per

EXDV/3

Matthias

Jesser

Tel.:

+495361948810

TheStandardsdepartment

K-ILI/5Ute

Hager-Suess

K-ILI

Tel.:

+495361949035

UweWiesner

Allrightsreserved.NopartofthisdocumentmaybeprovidedtothirdpartiesorreproducedwithoutthepriorconsentofoneoftheVolkswagenGroup’sStandardsdepartments.

?VolkswagenAktiengesellschaftVWNORM-2018-02

Page2

VW13750:2018-07

Contents

Page

1

Scope

2

2

Designation

2

2.1

Structureofthecodes

2

2.2

Designationexample

3

3

Requirements

3

3.1

Basicrequirements

3

3.2

Specificationsindrawings

4

3.3

Weldability

4

3.4

Agentsimpairingwettingability

4

3.5

Frictionbehavior

4

3.6

Zincandzincalloycoatings

5

3.7

Screws,bolts,nuts,threadedparts,andmoldedparts

5

3.8

Commercialsurfaceprotectiontypes

6

3.9

Partswithoutsurfaceprotection

6

3.9.1

Metalpartsexceptforthepartsinsection3.9.2

6

3.9.2

FastenerswithametricISOthread

6

3.10

Assignmentofsurfaceprotectiontypesandcodes

7

4

Applicabledocuments

13

AppendixA

SurfaceprotectiontypesasperVDA235-104

16

A.1

SurfaceprotectiontypesasperVDA235-104andVW13750

16

1Scope

Thisstandardappliestotheidentificationofgeneralsurfaceprotectiontypesforvehiclepartsandunitsindrawingsandtechnicaldocumentation.

Volkswagenstandard

VW13750-1

(previouslyVW13750supplement1)listsallinvalidsurfaceprotectiontypesthatwerecontainedinearlierissuesofVW13750.

2Designation

2.1Structureofthecodes

See

figure1

:Theabbreviationforsurfaceprotection('Ofl-',fromtheGermanwordfor'surface'),isfollowedbya4-charactercodefrom

table2

.

Figure1–Structureofthecodeforsurfaceprotectiontypes

Page3

VW13750:2018-07

2.2Designationexample

Forsurfaceprotection:Electrolyticallyzinc-alloy-plated,heavyprotection,silver-coloredtoslightlyiridescentblue,passivated,transparentlysealedandtreatedwithlubricant,asperTechnicalSup‐plySpecification

TL244

:

VW13750–Ofl-r645

3Requirements

3.1Basicrequirements

TogetherwithVolkswagenMaterialsEngineeringforMetals(GQL-M)and/ortheAudiAGLabora‐tory(I/GQ-L),theappropriateDevelopmentdepartmentwillclassifythevehiclepartsandunitsac‐cordingtotheircorrosionloadandassignthemtoaprotectionclasswithacodenumber(asper

table1

).

Ifthepartsandunitsarehandledaccordingtotheirintendedapplications,theremustbenodam‐

agethatleadstoafunctionalimpairmentand/oradecreaseintheprescribedcorrosionprotection.Therestrictionsasper

VW60361

mustbeobservedformechanicalfasteners.

Thefollowingstandardsapplytothreaddimensionsbeforeasurfacetreatment:

VW11610

,

VW11614

,

VW11624

,

VW11625

,and

VW11627

.

Thefollowingstandardsapplytothreaddimensionsaftersurfacetreatment:

VW11611

,

VW11615

,and

VW11628

.

Avoidanceofhazardoussubstancesasper

VW91101

.

Table1–Classificationofvehicleparts

Partgroups

Corrosionload

Protectionclass

–Partsthatarenotvisibleintheirinstalledconditionandthathavecorrosionprotectionthatisintendedexclusivelyasatransitcoatingandisnotrequiredfortheparts'properfunc‐tion.

Lowload

Lightprotection

Codenumber1

–Componentsinthevehicleinteriorandintheexteriorinaprotectedinstallationposition;notforfasteners(forexcep‐tions,see

VW01110-1

)

Mediumload

MediumprotectionCodenumber3

–Partsexposedtodirectopen-airweathering(e.g.,chassis,engine,motor,transmission)

–Partsthatcanbeseenintheirinstalledcondition(includingfromthebottomofthevehicle)

–Partsforwhichcorrosionprotectionisrequiredinordertosafeguardproperfunctionoftheparts

–Parts,e.g.,fasteners,thatcanbeusedinthevehicleinteri‐ororintheexteriorforreasonsofminimizingpartprolifera‐tion

Heavyload

HeavyprotectionCodenumber6

Page4

VW13750:2018-07

3.2Specificationsindrawings

Ifaspecificsurfaceprotectionisrequiredfortheentirepartorforseveralpartsintheassembly

(ASSY),thecodemustbeenteredinthetitleblockunder"Surfaceprotection";e.g.,Ofl-t650(seealso

VW01058

).Ifseveralsurfaceprotectiontypesareapprovedforuseattheuser'sdiscretion,

thecodesofallapprovedtreatmentsareindicated,e.g.,Ofl-r673/x630.

Ifonlypartialprotectionisappliedtoaworkpiece,"Seedrawing"mustbeenteredinthetitleblockunder"Surfaceprotection",theaffectedareaonthepartmustbemarkedwithawidedash-dotline(

figure2

),andthecodemustbeindicatedwithadatumline.

Ifonlyasmallareaontheparthasnosurfaceprotection,thentheunprotectedareamustbemarked(

figure3

).Inthiscase,"Seedrawing"isindicatedunder"Surfaceprotection."

Figure2

Figure3

Ifdifferentsurfacetreatmentsarespecifiedforasinglepart,"Seedrawing"mustbeenteredunder"Surfaceprotection."Theaffectedareasonthepartmustbeclearlydelineated.

IfpartsfromoneASSYarecoatedindividually(oneorseveraldifferentsurfacetreatments),then"Seedrawing"mustbeenteredunder"Surfaceprotection"intheassemblydrawing.Thesurfacetreatmentsmustthenbelistedindividuallyonapart-specificbasisintherespectivedrawingitself.

3.3Weldability

Ifpartswithsurfaceprotectionaretobeweldedtogetherwithoneanotherorwithothermetalparts,thenthepartsmustbetestedforweldability.

Ofl-c340mustbereservedasthestandardsurfaceprotectiontypeforweldingpartsinbodymanu‐facture(e.g.,forweldnuts).

3.4Agentsimpairingwettingability

Lubricantsandslushingoilsmustbefreeofsiliconeoilsandotheragentsthatsignificantlyimpairwettingability.

3.5Frictionbehavior

ThreadedpartswithametricISOthreadmuststaywithinthecoefficient-of-frictionrangein

VW01129

withintegratedoradditionallubricanttreatment.

Thelubricantmustbeneitherhazardoustotheuser'shealthnoremitanunpleasantodorduringthescrew-onprocess.Itmustalsobesuitableforautomatedbolting.

All-metalprevailingtorquetypenutsmustalwaysbetreatedwithanadditionalorintegratedlubri‐cant.Nutswithnon-metallicclampingmaybelubricatedinordertoachievethespecifiedfunctionalcharacteristics.Thefunctionalcharacteristicsofnutstreatedwithaprotectivecoatingand/orwitha

Page5VW13750:2018-07

lubricantmustnotdeterioratewithinastorageperiodof6monthsinweather-shelteredrooms.Thestoragetemperaturemustbebetween-5°Cand40°C.

Fastenersmadeofstainlessorheat-resistantmaterialsmayrequireanadditionallubricanttreat‐mentinordertomeettherequirementsin

VW01129

.

Theinfluenceofthesurfaceprotectiononthefrictionbehavior,particularlyforpartswithametricISOthread,mustbedeterminedbytestingandmatchedtotheperformancecharacteristics(see

VW01131

).

Forcoatingswithoutlubrication,thereisnoguaranteethatthecoefficient-of-frictionrangeasper

VW01129

isadheredto.

NOTE1:FastenerswithoutlubricationusuallymeetthecriteriaoffrictionclassDorEinAssocia‐tionofGermanEngineers(VDI)technicalrule

VDI2230,sheet1

,table"Assignmentofcoefficient-of-frictionclasseswithreferencevaluesforvariousmaterials/surfacesandlubricationconditionsinthreadedconnections."Forpartswithoutlubricanttreatmentandalockingoradhesivecoatingwithasetthreadcoefficientoffriction,acoefficient-of-frictionrangeofμtot=0.18to0.25mustbead‐

heredto.

3.6Zincandzincalloycoatings

Electroplated/galvanizedcoatingsarenotpermissibleforhigh-strengthsteelorstandardpartswithatensilestrengthofRm>1000MPaandthreadedpartswithapropertyclass≥10.9.Theuseof

zincflakecoatingsaspercodelettertispreferred.

ExceptionsarepossibleforZn/Nicoatingsasper

TL244

and

TL196

forsteelpartswithatensilestrengthof1000to1200MPa(max.Vickershardnessof370HV),aswellasforcomponentsthatareonlysubjectedtocompressionloads,e.g.,nutswithapropertyclass≤12.ThesameappliestoPTscrewsasper

VW60358

andself-tappingscrewsasper

DINENISO1478

.Inalltheafore‐

mentionedusecases,aheattreatmentisrequired.Referencevaluesfortemperingprocessesaredescribedin

DINENISO19598

,table"Standardvaluesforaheattreatmentforhydrogeneffusionaftergalvanizing."Theheattreatmentmusttakeplacewithinfourhours,preferablywithinone

hour,afterthecoating.Thetemperatureandholdtimesmustbespecifiedintheinitialsamplein‐spectionreport(ISIR).Thesuppliermusttakeintoaccountthenoticesof

DIN50969-1

and

DIN50969-2

whendesigningtheprocesses.Thesuppliermustensuretheeffectivenessofthemeasuresforpreventinghydrogen-inducedbrittlefractures.

Electro-galvanizedandzincalloyelectroplatedpartsmaybepost-treatedinpassivationsolutionsinordertoimprovetheircorrosionresistance.YellowpassivationtreatmentswiththeappearanceofyellowchromateconversioncoatingscontainingCr(VI)arenotpermissible.

Galvanizedzincsystemswithoutadditionalcoatings(e.g.,paintfinishesorsealants)areonlyper‐missibleforthevehicleinteriorarea.

Zinc/nickelalloycoatingsforelectricallyconductiveconnectionsarepermissibleonlywithtranspar‐entpassivation.

3.7Screws,bolts,nuts,threadedparts,andmoldedparts

Forscrews,bolts,nuts,andsimilarthreadedpartsandmoldedparts,morestringenttestrequire‐mentsapplytothethread-freeareasthantothethreadprofileandshank.Detailsconcerningthetestrequirementsaredescribedintherelevantstandards.

Theapplicationoftheprotectivecoatingsmustnotresultinthehtolerancezonepositionbeingex‐ceededinthecaseofexternalthreadsortheHtolerancezonepositionnotbeingreachedinthe

caseofinternalthreads.

Page6

VW13750:2018-07

3.8Commercialsurfaceprotectiontypes

Commercialsurfaceprotectiontypesmaybeusedforlessimportantapplications(e.g.,steelwire).However,theyarenotsubjecttocorrosionresistancetesting.Ifsuchprotectionissufficientfora

givenpart,onlythecodeletterfortherespectiveprocedureandthenumbers010mustbeprovi‐ded.Thedesignationwillthenread,e.g.,forcommercialpaint:Ofl-x010.

Thecommercialsurfaceprotectiontypes,e.g.,Ofl-c010,"commercialzinccoating,"andOfl-r010,"commercialelectroplatedzincalloycoating,"mustnotcontainanyCr(VI)compounds.

Theavoidanceofhazardoussubstancesasper

VW91101

alsoappliestocommercialsurfacepro‐tectiontypes.

3.9

3.9.1

Partswithoutsurfaceprotection

Metalpartsexceptforthepartsinsection3.9.2

Thecomponentsmustbedeliveredinacleanandcorrosion-freeconditionallthewaytotheirin‐

stallation.Itmustbepossibletofurtherprocessthecomponents(e.g.,welding)withoutanytrouble,andtheymustbeabletobestoredtemporarilyfor12weeksatthehall.Appropriatepackaging

measuresmustbeadditionallyincorporated.

FordrawingnoteOfl-a103,oilingasperQualitySpecification

QPA001

,appendix"Productlists"isrequired.Ifalternativeproductsmustbeused,thismustbediscussedandagreeduponwiththe

ProcessEngineeringdepartmentsattheplantsusingtheparts.Alternativeproductsmustalsomeettherequirementsin

QPA001

.

If,inexceptionalcases,partswithouttheirowntemporarysurfaceprotectionaretobedelivered,thismustbeexplicitlyindicatedinthedrawingwithdrawingnoteOfl-a100.Thesepartswillrequirepackagingthatisadequatefortherelevanttransportroute.

Drawingnotessuchas"plain","none","nodesignation",and"-"arenolongerpermissible.ThesenotesmustusuallybereplacedwithOfl-a103.

3.9.2FastenerswithametricISOthread

Thefollowingcodesmustbeusedforsurfaceprotectiontypes:

Ofl-a100:Correspondsto"notoiled"

Ofl-a101:Correspondsto"lightlyoiled"asper

DINISO8992

Ofl-a102:Oilfilmdependentonmanufacturingand/ormaterialconditionspermissible

Page7VW13750:2018-07

3.10Assignmentofsurfaceprotectiontypesandcodes

Thespecificationsin

table2

apply.

Theuseofsurfaceprotectiontypeswithcodesinitalicsandboldispreferred.

Surfaceprotectiontypeswithcodeshighlightedingrayarestandardsurfaceprotectiontypesforcomponentswithoutthreads.

TableA.1

liststhesurfaceprotectiontypesasperVW13750thatcorrespondtothesurfaceprotec‐

tiontypesasper

VDA235-104

.

Table2–Codesforsurfaceprotectiontypes

Surfaceprotectiontype

Code

Code

letter

Coatingmethod

Finish

orsystem;

Requirements

Post-treatment

andappearance

Codenumberforprotectionclass

1

Light

3

Medium

6

Heavy

a

Untreated

None

Notoiled

a100

-

-

Seefootnote

a)

Lightlyoiled

a101

-

-

Oilfilmdependentonmanufacturingand/ormaterialconditionspermissible

a102

-

-

Oilingasper

QPA001

a103

-

-

b

Phosphated

Phosphatedusinganymethod

Seefootnote

b)

Notoiled,gray

b100

c)

-

-

Passivated,gray

b101

-

-

Oiled,greased,gray

b110

d)

-

-

Layercontainingzinc,sil‐vergray(forinteriorarea)

b111

b)

-

-

Zincflakecoatingwithtopcoatcontaininglubricant,darkgray

b113

b)

-

-

Thin-layer

zincphosphated;

TL240

b)

Oiled,gray

b140

-

-

Notoiled,gray

b149

c)

-

-

c

Hot-dipgalvanized

TL217

Withoutpost-treatment,silvercolor

-

c330

c630

Electro-galvanized

e)

Anymethod;forhigh-strengthparts,butre‐strictedasper

section3.6

;

TL217

Withoutpost-treatment

f)

,silvercolor

-

c310

c610

Passivated

g)

,silvercolor

-

c340

c)

c640

c)

Passivatedand

sealed

g)

,silvertoslightlyiridescentbluecolor

-

c341

c641

Thick-layerpassivated

g)

,silvercolor,

iridescentcolor

-

c342

c642

Thick-layerpassivatedandsealed

g)

,silvercolor,iri‐descentcolor

-

c343

c643

Page8

VW13750:2018-07

Surfaceprotectiontype

Code

Code

letter

Coatingmethod

Finish

orsystem;

Requirements

Post-treatment

andappearance

Codenumberforprotectionclass

1

Light

3

Medium

6

Heavy

c

Electro-galvanized

e)

Anymethod;forhigh-strengthparts,butre‐strictedasper

section3.6

;

TL217

Thick-layerpassivated,treatedwithlubricant

g)

-

c347

h)

c647

h)

ForcontactwithMg;

forhigh-strengthparts,butrestrictedasper

section3.6

;

TL194

Passivatedand

sealed

g)

,

i)

,silvercolor

-

-

c696

Passivatedandsealed,

treatedwithlubricant

g)

,

i)

,silvercolor

-

-

c697

h)

e

Electrolytically

nickel-plated

e)

Semi-brightnickel-plat‐ed

Withoutpost-treatment,silvercolor

-

e310

j)

e610

j)

Brightnickel-plated

Withoutpost-treatment,silvercolor

-

e320

j)

e620

j)

f

Chromeelectroplated

Brightchrome-plated;

TL203

High-gloss,withmicro-cracks,silvercolor

-

-

f620

High-gloss,silvercolor

-

f350

f650

g

Electrolyticallytin-plat‐ed

k)

Brighttin-plated

Withoutpost-treatment

l)

,silvercolor

g100

g300

g600

Withoutpost-treatment

l)

,treatedwithlubricant,

silvercolor

-

-

g605

h)

Hot-diptin-plated

k)

Withoutpost-treatment,silvercolor

g120

g320

g620

k

Copperelectroplated

Withoutpost-treatment

k110

m)

-

-

r

Electrolyticallyzinc-al‐loy-plated

e)

AlloyedwithFe;

TL153

Transparentpassivation

g)

,silvercolor

-

r301

-

Passivated,sealed,black

-

r302

-

AlloyedwithNi,alka‐line;

TL244

Transparentpassivation

(silvertoslightlyiridescentbluecolor)

g)

-

-

r642

c)

Sealingandtransparent

passivation

g)

(silvercolor)

-

-

r643

n)

Sealingandtransparentpassivation,treatedwithlubricant

g)

(silvercolor)

-

-

r645

h)

AlloyedwithNi,weaklyacidic;

TL244

Transparentpassivation,silvercolor,onlyfor

castings

g)

-

-

r649

AlloyedwithNi,alka‐line;

TL244

Passivated,black

-

-

r672

c)

Passivated,sealed,black

-

-

r673

n)

Page9VW13750:2018-07

Surfaceprotectiontype

Code

Code

letter

Coatingmethod

Finish

orsystem;

Requirements

Post-treatment

andappearance

Codenumberforprotectionclass

1

Light

3

Medium

6

Heavy

r

Electrolyticallyzinc-al‐loy-plated

e)

AlloyedwithNi,alka‐line;

TL244

Passivated,sealed,trea‐tedwithlubricant,black

-

-

r677

h)

s

Duplexcoating(zincorzinc/nickelpluscathodicelectrocoating)

TL196

Zinccoatingasper

TL217

,phosphatedpluscathodicelectrocoating,jetblack

-

-

s611

Zn/Nialloycoatingasper

TL244

,phosphatedpluscathodicelectrocoating,jetblack

-

-

s621

Zn/Nialloycoatingasper

TL244

,phosphatedpluscathodicelectrocoating,treatedwithlubricant,jetblack

-

-

s627

h)

t

Zincflakecoating

TL245

Withoutpost-treatment,sil‐vergray

-

-

t601

Withtopcoat,silvergray

-

-

t602

Withoutpost-treatment,sil‐vergray

-

-

t610

c)

Withtopcoat,silvergray

-

-

t611

Treatedwithlubricantasper

TL52165

,silvergray

-

-

t615

o)

TL233

Withtopcoatcontaininglubricant

p)

;preferablyblack

-

t330

t630

TL245

Withtopcoatcontaininglubricant,silvergray

-

-

t647

TL233

Withtopcoat,preferablyblack

p)

-

t350

t650

TL180

Withtopcoat,black

-

-

t660

Withtopcoatcontaininglubricant,black

-

-

t667

TL134

Withtopcoat,anthracitegray

-

-

t670

Withtopcoat,brightgray

-

-

t680

u

Self-oxidation

DIN50938

Oiled

u110

-

-

Zn-ThDcoating

TL184

Passivated,silvergray

-

-

u610

Passivated,treatedwithlu‐bricant,silvergray

-

-

u615

h)

Page10

VW13750:2018-07

Surfaceprotectiontype

Code

Code

letter

Coatingmethod

Finish

orsystem;

Requirements

Post-treatment

andappearance

Codenumberforprotectionclass

1

Light

3

Medium

6

Heavy

u

Zn-ThDcoating

TL184

Passivated,organiccoat‐ing(cathodicelectrocoat‐ing),jetblack

-

-

u620

v

Passivation

Passivated,gray

v111

q)

-

-

Passivatedpluspost-dipsolution,gray

v112

r)

-

-

w

Anodizing

TL212

,decorativeuse

Anodized,matte,silvercol‐or

s)

-

-

w610

Anodized,glossy,silvercolor

-

-

w620

TL182

,decorativeuse

Anodized,glossy;inorgan‐iccoating,silvercolor

-

-

w625

Anodized,glossy;organiccoating,silvercolor

-

-

w626

TL212

,decorativeuse

Anodized,dyed,matte

s)

-

-

w630

Anodized,dyed,glossy

-

-

w640

TL182

,decorativeuse

Anodized,glossy;inorgan‐iccoating,blackcolored

-

-

w645

Anodized,glossy;organiccoating,blackcolored

-

-

w646

TL212

,decorativeuse

Anodized,matte

s)

,silvercolor

-

-

w660

Anodized,glossy,silvercolor

-

-

w670

TL212

,technicallyfunctionaluse

Anodized;colordependentonmaterial

w180

-

w680

Hard-anodized;colorde‐pendentonmaterial

-

-

w690

Hard-anodizedandim‐

pregnated;colordepend‐entonmaterial

-

-

w695

Castsurfaceblastedor

pickled,andhard-anodized

-

-

w699

x

Finish

Pretreatmentandcathodicelectrocoating,

TL178

-

-

x590

Pretreatmentnotrequired,single-layerliquidpaintorcathodicelectrocoating

t)

;

TL260

x100

x300

x600

Passivatedwithtopcoatcontaininglubricantasper

VW60469

-

-

x607

Tri-cationicphosphatecoating;

TL218

Multi-coatsystem

-

-

x610

Pianolacquerstructure

-

-

x611

Page11VW13750:2018-07

Surfaceprotectiontype

Code

Code

letter

Coatingmethod

Finish

orsystem;

Requirements

Post-treatment

andappearance

Codenumberforprotectionclass

1

Light

3

Medium

6

Heavy

x

Finish

Galvanized,tri-cationicphosphatecoating;

TL218

Multi-coatsystem

-

-

x612

Pianolacquerstructure

-

-

x613

Zirconium-dioxide-

basedpretreatment;

Fe,Zn,orMnphosph‐ated;

TL260

Single-layerliquidpaintorcathodicelectrocoating

t)

-

x330

-

Zincortri-cationicphosphatecoating;

TL260

Cathodicelectrocoating

t)

-

-

x630

u)

Zincortri-cationicphosphatecoating;

TL260

Double-layerpaint(dip

painting+spraypainting)

t)

-

-

x631

Zincortri-cationicphosphatecoating;electro-galvanized(batchgalvanized);

TL227

Cathodicelectrocoating

t)

-

-

x632

Zincortri-cationic

phosphatecoating

(passivationinexcep‐tionalcases);galvan‐izedsemi-finished

product;

TL227

Cathodicelectrocoating

t)

-

-

x633

Zincortri-cationicphosphatecoating;

TL260

Thick-layercathodicelec‐trocoating

t)

-

-

x634

Tri-cationicphosphatecoating;

TL262

Thick-layercathodicelec‐trocoating

t)

-

-

x635

Zincortri-cationicphosphatecoating,electro-galvanized(batchgalvanized);

TL227

Thick-layercathodicelec‐trocoating

t)

-

-

x638

Zincortri-cationic

phosphatecoating

(passivationinexcep‐tionalcases),galvan‐izedsemi-finished

product;

TL227

Thick-layercathodicelec‐trocoating

t)

-

-

x639

Tri-cationicphosphatecoating;

TL227

Cathodicelectrocoating

-

-

x640

Powdercoating

t)

Anypretreatment;

TL256

Forvehicleinteriorpartsinnon-visibleareas

-

x340

-

Page12

VW13750:2018-07

Surfaceprotectiontype

Code

Code

letter

Coatingmethod

Finish

orsystem;

Requirements

Post-treatment

andappearance

Codenumberforprotectionclass

1

Light

3

Medium

6

Heavy

x

Powdercoating

t)

Film-formingpretreat‐ment;

TL256

Foruseintheexterior,innon-visibleareas

-

-

x650

Film-formingpretreat‐ment,primed;

TL256

Foruseintheexterior,invisibleareasaswell

-

-

x651

y

Finishwithzincdustpaint

TL214

Basecoating,e.g.forleafsprings

-

-

y600

Heat-resistantzincdustpaint

-

-

y650

z

Electroplatedtin/zinccoating

Transparentpassivation,silvercolor

-

z300

v)

-

Transparentpassivation,treatedwithlubricant,sil‐vercolor

-

z305

h)

-

a)Nobasemetalcorrosionafterfourhoursinthecondensationstandardatmospherewithconstanthumidityasper

DINENISO6270-2

.

b)Ifnecessary,afterbeingphosphated,steelpartswithtensilestrengthvaluesgreaterthan1200MPamustbesubjectedtoanap‐propriateheattreatmentwithatemperatureofup200°Cinordertopreventbrittlefracturesinducedbyhydrogen

(

DINENISO9717

).

Inadditiontothespecificationsin

table2

,thefollowingperiodsoftimemustbeobservedfortheindividualprotectionclasseswhenperformingtheneutralsaltspraytestasper

DINENISO9227

:

Ofl-b100,Ofl-b1012hours,withoutbasemetalcorrosion

Ofl-b1106hours,withoutbasemetalcorrosion

Ofl-b111,Ofl-b11348hours,withoutbasemetalcorrosion

NOTE2:Ofl-b111=Ofl-b100+(2-μmto4-μm)zincflakecoating;lightabrasion,highsusceptibilitytosoilingofotherpartsintheeventofcontact.

NOTE3:Ofl-b113=Ofl-b149+(2-μmto4-μm)zincflakecoating+(2-μmto3-μm)topcoat(lubricantadditive);lessabrasionthanforOfl-b111.

c)Suitableforfastenersusedinthebody-in-whiteandforfastenerswithadhesivecoatingsasper

DIN267-27

,lockingcoatingsasper

DIN267-28

,andsealingcoatingsasper

TL195

.

d)Forthreadedparts,onlyoiloroilemulsionsarepermissible.

e)Immediatelyaftersurfacetreatment,steelpartsthataresubjecttotensileloadsandhavetensilestrengthvaluesgreaterthan

1000MPamustbesubjectedtoanappropriateheattreatmentinordertopreventbrittlefracturesinducedbyhydrogen.Thismustbeverifiedbymeansof