Powder Coating using Metallic Powders
Architect Information Surface Finishes
Status 11/2014
Powder Coating in Metallic Colours
Architect Information
Contents
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Portfolio Metallic
Composition of powder-based Metallic Surface Finishes
Principle of Powder Production
Components of Metallic Powders
Pigment Types as distinguishing Features of Metallic Powders
Incorporation of Pigments
Coating using Metallic Powders
Surfaces based on Metallic Powders
Typical problems with Metallic Powders
Cleaning of Metallic Surface Finishes
Schüco System Finish Information
Contact details
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1. Schüco Overview System Finish
Schüco Options Metallics in coating (Status 11.2014) – Metallics in Red
Basis
Performance
Decor
Premium
MetallicEffekte
Fluorpolymer-Pulver
Cost
PowColor
Facade Quality
Powder Base Coat with
Topcoat
AnoLine
Pre-Anodisation with
Powder Top Coat
MetallicLine
DuraClean
(Powder)
Anti-Graffiti
High Durability Quality
Fine Texture Powder
AnoLine FS
Wood & Stone Optics:
DECORAL
NATURALL
WetLine
Trend/-colours Metallic
AnColor
Anodisation
(E6/EV1, C0)
MetallicLine Plus
INOX Optic Powder
Anodisation for Structural
Glassing
(SG Anodisation)
Coloured Anodisation with /
without mechanical Pretreatment
(E1 to E6, C0, C31 to C35)
(Anodisation)
INOX Optic Classic
INOX Optic Plus
Silbver & Gold (EV2 to
EV 4)
Gloss anodisation
S315
WetColor
(Liquid Paint)
Polyurethan (PUR)
Duraflon
PUR Trend
SANDALOR
Duraflon
Duraflon Trend
AnoLine DF
PVDF
PVDF Decor
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2. Composition of powder-based
Metallic Surface Finishes
Example:
Powder layer
layer
Powder
Protective &
& bonding
Protective
bondinglayer
layer
Metallicaluminium
aluminium
Metallic
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Quality-assured powder coating with
GSB/Qualicoat approval
Corrosion protection and bonding base
for powder coating as per GSB/Qualicoat
Schüco profiles, accessories and
customer material
3. Principle of Powder Production
Process of powder production
(Source: TIGER)
Steps:
1) Supply
2) Initial weight & logging
3) Pre-mixing
4) Extrusion
5) Rolling out
6) Breaking over rollers
7) Optimisation of particle size
in the grinder
8) Packaging
9) Bonding (if necessary)
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4. Components of Metallic Powders
Overview
Colour-independent components:
Colour-dependent components:
Polyester-based polymers
Curing components
These two components determine the basic
properties and are tailored to the architecture.
Pigment preparation
The effect is set up in a reproducible way by
means of the following properties:
- Material (chemical composition, finish)
- Particle size (effect & characteristic)
Additives
- Distributing agent (controls the position of the
Additives optimise the surface finish process
particles in the coating and thereby their
and the formation of effects and ageing
effect).
behaviour (where applicable). They also
prevent undesired effects such as rotting.
The entire product is tested and
Filling agent
Serves to support the process when covering
the colour layer.
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approved by quality assurance bodies
such as GSB and/or Qualicoat for use in
architecture.
5. Metallic powders: Pigment Types
Overview of Raw Materials available for Metallic Effects
Uncoated aluminium pigments and coated polymers or SiO2
- Very good decorative effects
- Can be attacked by oxidation, acids and bases
Copper and brass alloys
- Very good decorative effects
- Can be attacked by oxidation, acids, bases and ammonia
Stainless steel
- Attractive appearance, but high specific density makes it difficult to incorporate in powder coating
- Extremely durable (even in industrial and coastal areas)
- Problems owing to nitrogen content, labelling required above approx. 8% (sensitising, possibly
carcinogenic)
Coated mica pigments
- Attractive look paired with good incorporation and mechanical resistance
- Weather-resistant owing to the coating of TiO2
- Variable colour effect owing to coating with different metal oxides
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5. Metallic Powders: Pigment Types
Non-leafing Aluminium Pigments
(Images: Inver)
Non-leafing (sparkle/silver dollar)
-
Fine to mid-size particles, D 50 approx. 10 - 60µm
Grip and moisture-resistant
- Sparkling effects
- Natural anodised effects
- Weather-resistant thanks to coating with special
polymer or SiO2
Silver Dollar, Dv50 = 35
Sorgente
di Luce
Light source
Metallic powder
Substrato
Pre-treated
Aluminium
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5. Metallic Powders: Pigment Types
Leafing Aluminium Pigments
(images: Inver)
Leafing (brilliant, chrome effect)
- Coated with silica acid to achieve leafing
-
effect (position on surface finish)
Very small particles, Dv50 approx. 5 - 15µ
Low grip and scratch resistance
No weather resistance
Flakes Dv50 = 18
Sorgente
di Luce
Light source
Metallic powder
Pre-treated
Aluminium
Substrato
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5. Metallic Powders: Pigment Types
Raw Materials for Metallic Effects: Pearl Effect Pigments
Naturally or artificially produced mica
flakes are the main component of all
pearl effect pigments. Density of 2.7 to
3.1 g/cm3
Based on the naturally or artificially
produced mineral mica, the flakes are
treated with transparent metal oxides
(TiO2, Fe2O3, Cr2O3) having a high
reflection value.
Weather-resistant owing to the coating of
TiO2.
Mica
Metal oxide
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(Scheme Inver / image: Tiger)
5. Metallic Powders: Pigment Types
Colour Effects of Pearl Effect Pigments
Blue
Colour effects through interference
Green
Red
Yellow
Silver
TiO2
Mica
TiO2
TiO2
Mica
Mica
TiO2
TiO2
Mica
Mica
Colour effects through interference and absorption.
Red
Bronze
Copper
Fe2O3
Fe2O3
Fe2O3
Mica
Mica
Mica
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Brown
Green
Gold
Fe2O3
Fe2O3
TiO2
TiO2
Mica
Mica
Cr2O3
TiO2
Mica
5. Metallic Powders: Pigment Types
Difference in Effect of Effect Pigments
(Inver)
Principle: The light is refracted, reflected and distributed diffusely over the different
pigment lamina. Colour effects are generated by the superimposition of reflected light rays.
Metal pigments
Pearl effect pigments
Light reflection
Reflected and refracted light
Light
Sorgente
di luce
source
Light source
Sorgente
di luce
Powder layer
Powder layer
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6. Metallic Powder:
Incorporation of the Pigments
Dry blend
Powder coating
Bonding
Pigment
The bonding procedure does not improve
the chemical resilience of the pigments.
Scheme: TIGER
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6. Metallic Powders: Incorporation of Pigment
Differences in Effect dependent on Method of Incorporation
Dry Blend (dry mixture)
- Powder coating and pigment are mixed in the
drum-tumbling machine
- Pigment and powder lie next to one another as
loose material
- Cost-effective process
- Risk of separation with application (no cloudy
formations, delay in effect)
Illustrations:
- Left: microscopic view of metallic dry blend
(Image: Inver)
- Right: microscopic view of a metallic dry-blend with
assignment of components (Image: TIGER)
Pigment
particles
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Coating
particles
6. Metallic Powders: Incorporation of Pigment
Differences in Effect dependent on Method of Incorporation
Bonding (sintering)
- The pigment particles are bound to polymer
particles
- Recirculation of the finest particles
- Distribution of particle sizes changes
- More expensive (extra charge), but recovery
possible
Illustrations:
- Left: microscopic view of bonded metallic powder
coating (Image: Inver)
- Right: microscopic view of a bonded metallic
powder coating with assignment of components
(Image: TIGER)
Pigment
Powder corn
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7. Basics of processing Metallic Powders
General Principles for coating Metallic Colours
To avoid optical anomalies, a building project is handled by a single anodiser. Profiles and
customer material (accessories, metal sheets, fittings) must be processed
by one
anodiser to ensure the finish is as uniform as possible.
The surface finishes shown on colour charts and with samples are not binding for projects;
they serve merely as a guide.
When project orders are processed, Schüco sends finished samples with the metallic
colour provided by the surface finisher for approval by the architects/investor as a binding
basis for the surface finish order.
Additional orders must be specified as such by the architects, stating the sample or name
of the order wherever possible, to guarantee uniformity of colour (without ageing).
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7. Coating of Metallic Powders
Principles of electrostatic Powder Coating
Vertical coating facility at a Schüco partner in Points to note with metallic powders:
Germany (Schüco image)
• Extraction only through the fluidisation unit and
not from the box.
• Use of same application technology (Corona or
tribo technology) for all parts to be coated.
• The hanging is critical (same alignment, precoating if necessary for difficult geometry,
adjustment of belt speed).
• Adherence to the curing conditions (powder
manufacturer and Schüco SN 47): thick and
thin-walled parts must not be hung haphazardly
as this may result in uneven surface finishes.
• The main visible surface should always be
coated last; where there are several main visible
surfaces, the best possible method of hanging
and alignment needs to be found.
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7. Surface Finishes using Metallic Powders
Definition of Surface Finish Requirements
Schüco delivers its surface finishes based on
proven
GSB and/or
Qualicoat-approved
metallic
powders,
supplemented
by
monitoring of the surface finish partner by
Schüco (system finish).
Additional security of surface finish by Schüco
as part of the system finish warranty:
- Application tests of new surface finishes on
Schüco standard profiles (application)
Links:
Quality standards institutions
- GSB:
www.gsb-international.de
- Qualicaot: www.qualicoat.net
- AAMA:
www.aamanet.org
Schüco www.schüco.com
- Access for architects
- Download area
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- Application test on function and negative effects
with Schüco aids (cleaner, protective foiling)
- Sample sheets for approval
8. Surfaces based on Metallic Powders
Object Process
Schüco suggests for larger building projects Additional protective steps for the optical
(objects) the pre-agreed joint organisation of Results for Metallic Coatings of Objects:
the coating powder:
The metal builder provides the required total
volume of the object to order the required
Depending on the pigmentation of a metallic
powder in the smallest number of productions.
powder due to the general exiting tolerances in the
finish process, it can not always be avoided to
One object sshould be coated if possible just
have visible differences in colour / effect (compare
by one coater (Schüco material & customerSupplementary terms and conditions of sale and
owned material) due to the used application
delivery for surface finishing and associated
technology.
services of Schüco International KG § 6.9).
In preparation of an order Schüco can check with
the potential powder supplier upon request and will
inform the customer accordingly.
Written clearance of sample sheets by the
metal builder to Schüco.
Agreement for limiting samples out of
production or preparation of a sample facade.
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8. Surfaces based on Metallic Powders
Current Metallic Finishes based on Powder Coating – all in High Durable Quality (photos: Schüco)
MetallicLine Plus
Cupper as Fine Texture
(top) and smooth
(bottom)
Selection MetallicLine
Plus as Fine Texture
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MetallicLine Gold (top)
and Buliding Bronce (below)
with smooth texture
WetLine Overview
(Iron oxide)
8. Surfaces based on Metallic Powders
Current Metallic Finishes based on Powder & Liquid Paint Coating (AnoLine DF)
AnoLine
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AnoLine FS
(photo: Schüco)
AnoLine DF
8. Surfaces based on Metallic Powders
Current Schüco Metallic Surfaces developed in co-operation with powder suppliers
AnoLine SanLine – Sandalor® Optik
Trend colours Metallics – White Metallics
AnoLine Anolok – UK Anodisation Optics
Trend colours Metallics – iridescent Metallics
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9. Metallic Surface Finishes
Typical problems with Metallic Surface Finishes (images: Inver/FEM)
Different Application Technology
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Different Layer Thickness
9. Metallic Surface Finishes
Typical Problems
(Images: Inver)
Incorrect Cleaning Agent (corrosion)
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Insufficient Mortar Resistance
10. Cleaning and Maintenance of Metallic Surface Finishes
Notes
Metallic surface finishes fulfil the following coating requirements:
Protection of metallic base layer and decorative function
Maintenance and cleaning is required in order to retain these protective qualities and to maintain value
for as long as possible.
Owing to the chemical nature of the pigments used to generate the metallic effect, metallic coatings
must be maintained and cleaned carefully in accordance with the cleaning instructions.
For more information, see the relevant trade associations:
Gütegemeinschaft für die Reinigung von Metallfassaden e.V (GRM) (Quality Control
Association for Cleaning of Metal Façades)
Internet: www.grm-online.de
Window & Façade Association
Internet: http://window.de
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11. Viewing and Acceptance of Metallic Surfaces
Information
Metallic Surfaces offer interesting decorative properties.
Due to factors such as kind of effect, effect intensity, angle dependency (of effect),
application geometry and part geometry, the resulting decorative impression may
be different from a master sample.
The viewing and acceptance of objects with coated surfaces including metallic surfaces
is performed under diffuse day light at a 90° angle towards the building side in a distance
of 5 m (outside surface) or 3 m (inside surface). The result is based on the primate of the
eye, e.g. a uniform optic of the surface for each side is intended.
Additional information is provided by:
Verband der Fenster- & Fassadenhersteller e.V. (VFF)
Informationen at: http://www.window.de/vff.html
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12. Schüco System Finish Information
Overview of available information from Schüco – Status 11/2014
Downloads via www.schueco.com:
Architect info Pre-treatment
Architect info Powder Coating
Architect info Metallics
Architect info Dirt repellent Coatings
Architect info Liquid Paints
Architect info Anodisation
Videos Finish Methods
Digitale Info via SCV:
A wide series of information for current finish
products is also available as PDF.
Function and Service Information Schüco
All Information are available as PDF in German or
English.
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Printed Information:
Colour finishes for Aluminium (Colour Booklets)
Edition Basic 07/2012 (Art. No. 63116) for often
requested finishes used in end customer
business such as RAL, Standard Metallics and
Anodisation according to EURAS.
Edition Advance 12/2014 (Art. No. 63118)
contains also object surface options and special
finish methods used mainly for objects.
13. Contact Details
For additional information and support for the presented products, please
contact the Service Centre Finish (SCV)
Schüco International KG
Karolinenstraße 1-15
33615 Bielefeld
Tel.:
Fax:
0521 / 783 - 0
0521 / 783 - 451
www.schueco.com
info@schueco.com
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