Colouring

EUR O INOX SEMINA R " INNO VAT IO N IN STAINL ES S STE EL FABR ICA TIO N" - MAAS T R ICH T, NL - 30 NOV 2011

EUR O INOX 2011 1

ColouringOptionsforStainlessSteel

Alenka Kosma,M.Sc.EuroInox,Brussels

Maastricht,30November 2011

Agenda

1 Introduction1. Introduction2. Electrochemicalcolouring3. Surfaceblackening4. PVDcoatingsandsputteredcolour5. Coilcoating6. Painting7. Metalliccoatingsg8. Newtechniques9. Conclusion


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Alloyingchromiumtothesteelremarkablyincreaseschemicalresistance

...andincreasesthepassivelayeronstainlesssteels


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Allstainlesssteelfamiliesarenotequallyappropriatefordifferentcolouringtechniques

BasicstainlesssteelfamiliesAustenitic Austenitic

Ferritic Martensiticandprecipitationhardening

Duplex

2.Electrochemicalcolouring

Chemical processChemicalprocess Chromicandsulphuricacids Hotalkalinesolutioncontaining

strongoxidisingagents Increasedpassivelayer(from

0.02mto0.36m) ) Widerangeofcolourscanbe

achieved


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Nopigments/nofading Austeniticsmostly Ferriticsonlydarkgrey


Not for hightraffic areasNotforhigh trafficareas irreparableifdamagedby

scratching,fabricationorcorrosion

Joiningtechniques NO welding,brazingg g YES adhesivebonding,

screwing,riveting

Sources:InoxColorGmbH,Walldrn(D)(top),SteelColorS.p.a,PescaroloedUniti(I)(below)


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3.Surfaceblackening

Chemical processChemicalprocess Immersioninamoltensalt

bathofsodiumdichromate Thinoxidefilmisformed Itdoesnotpeel Veryresistanttoheating

Sources:SteelColor S.p.a.,Pescarolo EdUniti (I)(left),

3.Surfaceblackening

Not only aethetic, but also functionalNotonlyaethetic,butalsofunctional Canbemoderatelydeformed Good resistancetoabrasion

Source: EnergieSolaire,Sierre(CH)


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4.PVDcoating

Coating material vaporisedCoatingmaterialvaporised,thinfilmdeposition

Besttechniqueforthinfilms Porefreeanddense

Source:HansHollein Atelier,Vienna(A),(right)

4.PVDcoating

For exposed and agressiveForexposedandagressiveapplications

Theunderlyingtextureisvisible

Colourdamaged,ifattackedagressively

Welding priortocoatingg p g

Source:InoxColor,Walldrn(D),HansHolleinl ( ) ( h )


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5.Coilcoating

Industrial inline processIndustrialin lineprocess Extensivecolourrange Clearvarnishes Coloursdonotincrease

thecorrosionresistance Nonweldable

Source:CentroInox,Milano(I)

5.Coilcoating

For nonglaring applicationsFornon glaringapplications Hightrafficroadtunnels

Source:CentroInox,Milan(I)


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5.Coilcoating

For antifingerprintForanti fingerprintapplications

Clearvarinshesforwhitegoodappliances

6.Painting

For aesthetic reasonsForaestheticreasonsmostly


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6.Painting

For increased visibilityForincreasedvisibility Cleanlinessisakeyelementinsuccessfulpaintingofstainless

steel

Source:CentroInox,Milan(I)

6.Painting

Userfriendly options for persons with impaired visibilityUser friendlyoptionsforpersonswithimpairedvisibility


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7.Metalliccoatings

Primarily used for roofingPrimarilyusedforroofingandrainwatergoods

Donotimprovecorrosionresistance

Easierfieldpaintingprocessthanpaintingbarestainlesssteel

Source:Spenglerdirect,Ermatingen (CH)

7.Metalliccoatings

TincoatedTin coated Coppercoated


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8.Newtechniques

Digital printing offersDigitalprintingoffersanycolourorpicturetobeapplied

Source:Albrigi,StallavenadeGrezzana(Verona)(I)

Conclusions

many different options and techniques availablemanydifferentoptionsandtechniquesavailable materialselectionshouldbebasedonexposure data Colouringstainlessdonotenhancecorrosionresistance

likeinthecaseofcarbonsteel


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