Zinc Flake Coatings
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Zinc Flake Coatings
Zinc Flake Coatings
Introduction to Zinc Flake Coatings-
Zinc flake coatings are advanced, non-electrolytic anticorrosion systems designed for automotive, construction, and
industrial components. They provide a thin, uniform barrier layer that delivers long-lasting protection without altering
dimensions. Their biggest advantage is no hydrogen embrittlement, making them ideal for high-strength fasteners.
Key Benefits of Zinc Flake Coatings
Superior corrosion resistance (up to 1000–2000 hours SST)
Thin coating thickness (5–20 microns)
No risk of hydrogen embrittlement
High chemical and heat resistance (up to 300°C)
Eco-friendly and fully RoHS/REACH compliant
Excellent adhesion for topcoats and lubricants
Geomet Coatings
Introduction to Geomet Coatings
Geomet is a globally trusted, water-based zinc–aluminum flake coating offering exceptional corrosion protection with
extremely thin layers. Used extensively for fasteners, chassis parts, and industrial hardware.
Corrosion Protection
GEOMET® 500 alone or in combination with our range of topcoats passes the most severe corrosion cyclic tests. It
protects parts from rust even after mechanical damages, such as stone chipping, thanks to its self-healing property. It
also ensures bimetallic compatibility with aluminum alloys. Its nominal thickness can be adjusted (from 6 to 15 μm and
from 1 to 3 layers depending the type of application process) to meet the expected performance
Lubrication
GEOMET® 500 is a self-lubricated basecoat, which allows to obtain a stable and controlled friction coefficient in the
range of 0.12-0.18. This is a simplified solution compared to using a “base coat + top coat” system.
0.12-0.18
(ISO 16047)
Temperature resistance
Performances maintained up to 300°C.
Electrical properties
Conductive and offers perfect galvanic properties to avoid bi-metallic corrosion in most of industrial assemblies (cast
iron, carbon steel and aluminum alloys).
Paintability
Good surface conditions for paints or additional coatings.
No hydrogen embrittlement
Implemented via non-electrolytic application processes. This avoids the hydrogen embrittlement phenomenon that
causes cracking of metals.
GEOMET® 720 alone or in combination with our range of topcoats passes the most severe corrosion cyclic tests. It
protects parts from rust even after mechanical damages, such as stone chipping, thanks to its self-healing property. It
also ensures bimetallic compatibility with aluminum alloys. Its nominal thickness can be adjusted (from 6 to 15 μm and
from 1 to 3 layers depending on the type of application process) to meet the expected performance
Temperature resistance
Performances maintained up to 300°C.
Static friction
Static friction coefficient > 0.20.
Electrical properties
Conductive and offers perfect galvanic properties to avoid bi-metallic corrosion in most of industrial assemblies (cast
iron, carbon steel and aluminum alloys).
Paintability
Excellent surface conditions for paints or additional coatings.
No hydrogen embrittlement
Implemented via non-electrolytic application processes. This avoids the hydrogen embrittlement phenomenon that
causes cracking of metals.
Corrosion protection
GEOMET® 321 alone or in combination with our range of topcoats passes the most severe corrosion cyclic tests. It
protects parts from rust even after mechanical damages, such as stone chipping, thanks to its self-healing property. It
also ensures bimetallic compatibility with aluminum alloys. Its nominal thickness can be adjusted (from 6 to 15 μm and
from 1 to 3 layers depending on the type of application process) to meet the expected performance.Implemented via non-electrolytic application processes. This avoids the hydrogen embrittlement phenomenon that
causes cracking of metals.
Temperature resistance
Performances maintained up to 300°C.
Static friction
Static friction coefficient > 0.20.
Electrical properties
Conductive and offers perfect galvanic properties to avoid bi-metallic corrosion in most of industrial assemblies (cast
iron, carbon steel and aluminum alloys).
Paintability
Excellent surface conditions for paints or additional coatings.
No hydrogen embrittlement
Implemented via non-electrolytic application processes. This avoids the hydrogen embrittlement phenomenon that
causes cracking of metals.
SIMPLIFIED TECHNOLOGY with GOOD PERFORMANCE
ZINCROKOTE® is a zinc flake anticorrosion coating using water- based chemistry. Derived from reference technologies
developed by NOF METAL COATINGS, it is applied in 2 coats and meets corrosion resistance requirements up to 400
hours in salt spray test.
Coating with metallic silver appearance consisting of:
Thin dry film, non electrolytic
1 basecoat coat + 1 topcoat coat
Water-based chemistry
Free from hexavalent and/or trivalent chromium, nickel and cobalt Passivated zinc and aluminum flakes in a binder
Characteristics and performance
● Adjustable coefficient of friction thanks to PLUS-family topcoats
● Performance maintained at elevated temperatures (up to 300C) .
● Electrical conductivity for most application
● Bimetallic compatibility with aluminum
● No hydrogen embrittlement
● Paintable coating
Corrosion resistance
Average thickness Salt Spray
Test (ISO 9227)
6 μm
> 72 hours without white rust
> 400 hours without red rust
Results may vary depending on substrate, geometry of parts and type of application processes, without thermal shock
nor mechanical damage.
Application processes
ZINCROKOTE® can be applied by Dip-Spin, using bulk or rack coating process
Health and Safety
- ● Aqueous dispersion
- ● Complies with REACHZINCROKOTE® can be applied by Dip-Spin, using bulk or rack coating process
Complies with the 2011/65/EU and (EU) 2015/863 directives
International standards
ISO 10683 – Fasteners: non-electrolytically applied zinc-flake coatings
EN 13858 – Non-electrolytically applied zinc-flake coatings on iron or steel parts
ASTM F1136/F1136 M – Zinc/Aluminum Corrosion Protective Coatings for Fasteners
GEOMET 720HP provides enhanced corrosion performance even on areas subjected to mechanical damage. The
combination with various topcoats provides a large range of COF, and excellent galvanic protection. It also fulfills
various OEM requirements and meets the environmental rules and regulations introduced by various organizations
around the world.
1000-2000 h
(ISO 9227/ASTM B117/JIS Z2371)
* The standard application of GEOMET® 720HP is 2 coats 2 bakes.
Temperature resistance
Performances maintained up to 300°C.
Static friction
Static friction coefficient 0.19-0.23 (ISO 16047)
Electrical properties
This film is conductive and offers perfect galvanic properties to avoid bi-metallic corrosion in most industrial assemblies
(cast iron, carbon steel and aluminum alloys).
Paintability
Excellent surface conditions for paints or additional coatings.
No hydrogen embrittlement
Implemented via non-electrolytic application processes. This avoids the hydrogen embrittlement phenomenon that
causes cracking of metals.
Processes
GEOMET® 720HP can be applied via bulk dip/spin, rack dip/spin, spray or electrostatic spray. This variety of processes
allows coating of all types of parts, even those requiring partial coating, or with recessed and hollow surfaces
Moreover, they are non-electrolytic and thus avoid the phenomenon of hydrogen embrittlement which causes cracking
of metals.
BULK DIP/SPIN
ELECTROSTATIC SPRAY
RACK DIP/SPIN
SPRAY
Waterborne zinc flake
GEOMET® 720 HP is developed, using an advanced technology perfected by NOF Metal Coating Group for over 45
years. To enhance the corrosion resistance, an innovative binder is used with zinc and aluminum flakes. It complies with
various environmental directives, health and safety requirements. It is water-based, chrome-free, nonylphenol-free and
PFAS-free.
The performance described above was obtained by the test method specified by us and does not guarantee all
performance under the customer’s usage conditions.
Compliant with
REACh – Registration, Evaluation, Authorization and restriction of Chemicals
2011/65/EU and (EU) 2015/863 – Directive of the European Parliament on the restriction of the use of certain hazardous
substances in electrical and electronic equipment
ASTM F1136 / F1136 M – Zinc/Aluminum Corrosion Protective Coatings for Fasteners
EN 13858 – Corrosion protection of metals – Non-electrolytically applied zinc flake coatings on iron or steel components
EN ISO 10683 – Fasteners – Non-electrolytically applied zinc flake coating systems
WEEE – Waste from Electrical and Electronic Equipment
Advantages Over GEOMET®720LS
- ● Lower Film Density: Increased coating thickness (approx. 11%) at the same coating weight.
● Reduced Weight: Decreases material usage, contributing to cost efficiency.
● Improved Corrosion Performance:
○ Outperforms in Cyclic Corrosion Tests (CCT-C, CCT-HB, and CCT-1).
○ Achieves greater longevity under scratched and unscreened conditions.
● Meets Resistance Standards: Oil, water, humidity, and heat resistance are equal or superior to
GEOMET®720LS.
Delta Coatings: (dorken)
High-performance zinc flake coatings offer superior corrosion protection, electrochemical conductivity, and
controlled friction through integrated lubrication. PFAS-free, with excellent adhesion, ductility, and
high-temperature resistance for automotive and industrial components.
Disclaimer: The Delta coating is carried out at Aum Korro Tech (Unit 4 of the Aum Dacro Coatings Group)
Base coat -
The basecoat is the zinc flake coating that is applied directly to the substrate. It determines the corrosion
protection characteristics of the system, with the zinc making it responsible for the cathodic protection. The
application technology may vary, depending on the component.
Basecoat from DÖRKEN
The basecoats from Dörken have a high level of electrochemical conductivity, thanks to the high zinc flake content. The flakes
are each in electrochemical contact to one another. If the coating is damaged, the zinc sacrifices itself, thereby protecting the
steel surface. All Dörken zinc flake basecoats can be combined with the Dörken topcoats
DELTA®-TONE 9000
DELTA-PROTEKT® KL 100
DELTA-PROTEKT® KL 105
Excellent combination with DELTA®-SEAL-Series Frequently used for springs, hose clamps and stamping parts Very good adhesion and ductility
deally tailored for threaded parts Temperature resistant PFAS free
Integrated lubricant additive for a defined coefficient of friction Ideally tailored for threaded parts Resource efficiency Good protection against white rust High temperature resistance
DELTA-PROTEKT® KL 130
DELTA-PROTEKT® KL 120
DELTA-PROTEKT® KL 170 RT
Dark grey basecoat Ideally suited for black topcoats (avoids silver shimmer)
Suitable for coating of many different components Excellent adhesion Especially high temperature resistance Very good protection against white rust Very good ductility
Room temperature curing zinc flake For industrial coating in the low temperature range Coating of temperature-sensitive components possible PFAS free
Top coat -
A topcoat complements the properties of the base coat or galvanic substrate: it enhances corrosion protection. A topcoat can also achieve various characteristics of the coating system: setting of a definedcoefficient of friction, chemical and mechanical resistance, coloring or wear resistance
DELTA®-SEAL-Series
DELTA-PROTEKT® VL-Series
DELTA-PROTEKT® VH-Series
Solvent-based topcoats
For universal application on various
substrates
Available in a range of colours
Chemical resistance
Partly with in order to fulfil
requirements of friction coefficie
Solvent-based topcoats
For universal application on various
substrates
Developed for special applications
requiring UV- and chemical
resistance
Partly with lubricant additive in
order to fulfil requirements for
friction coefficient
Water-based sealings
Extremely thin layers of 1-5 μm
Suitable for zinc flake, galvanic zinc
coating and zinc alloys
Partly with lubricant additive in
order to fulfil requirements for
friction coefficient
DELTA-COLL®-Series
Special products
Solvent-based sealings
Extremely thin layers of 1-5 μm
Colorless or black
Ideally suited for galvanic zinc
coatings and zinc alloys
Partly with lubricant additive in
order to fulfill requirements for
friction coefficient
Bonding agents
Lubricants
Sliding lacquer
High temperature protection
Zintek® (Atotech)
Zintek offers advanced modular zinc flake coating systems engineered for superior corrosion resistance, precise friction
control, and lasting surface performance. These coatings combine innovative base coats and compatible topcoats,
providing tailored solutions that meet or exceed global OEM standards for automotive, construction, and industrial
applications.
Zintek coatings ensure exceptional protection against red rust and white rust even under extreme environmental
conditions. The system’s modular nature allows flexibility in coating selection—ensuring optimal performance for
fasteners, brake components, chassis parts, and other critical metal elements.
Superior protection with just one coat:
Key features & Benefits:
- ● Inorganic silver zinc flake base coat
- ● One layer system
- ● Excellent cathodic corrosion protection
- ● Reliable corrosion protection of 720 h NSST with only one coat (6 – 8 μm)
- ● Very good adhesion and wear resistance
- ● Attractive alternative to HDG, multi-layer zinc flake coatings as well as plating finishes
- ● Free of harmful heavy metals such as Cr(VI), cadmium, cobalt, lead or nickel
- ● Combinable with Atotech’s top coats
- ● Reduces operating cost and processing time compared to standard two layer coatings
- ● Increased coating line capacity
APPLICATIONS:
- ● Coating material for dip-spin and rack-spin application
- ● Fasteners like bolts, screws, nuts or clamps
- ● Stamping parts, brake components, chassis parts or springs
The neXT level base coat
Key features & Benefits:
- ● Inorganic silver premium zinc flake base coat
- ● Outstanding cathodic corrosion protection
- ● Exceptional performance in NSST as well as CCT
- ● Excellent delay in white rust formation
- ● Very good adhesion
- ● Attractive silver appearance
- ● No hydrogen embrittlement
- ● Free of harmful heavy metals such as Cr(VI), cadmium, cobalt, lead or nickel
- ● Combinable with Atotech’s Zintek® Top, Techseal® or Techdip® top coats
APPLICATIONS:
- ● Fasteners, springs, clips, brake components
- ● Large chassis and stamping parts
- ● Dip-spin, rack-spin and spray
Thin-layer topcoat for optimal protection
Key features & Benefits:
- ● Water-based inorganic clear top coat
- ● Tremendously boosts corrosion protection
- ● Best-in-class results in NSST as well as cyclic corrosion resistance (CCT)
- ● Outstanding white rust resistance
- ● Very good adhesion
- ● Thin layer application with approx. 1 μm thickness
- ● Moderate curing temperatures
- ● Attractive transparent appearance
- ● Controlled friction properties
- ● Excellent results on zinc flake base coats as well as on electroplated zinc/zinc alloys
APPLICATIONS:
- ● Suitable for dip-spin, rack-spin and spray
- ● Fasteners, springs or clips
- ● Large automotive parts such as chassis or stamping part
The best base for deep black zinc flake surfaces for deep black zinc flake surfaces
Key features & Benefits:
- ● Inorganic black zinc flake base coat
- ● Excellent corrosion protection in combination with Atotech’s top coats
- ● Excellent delay of white corrosion formation
- ● Very good adhesion
- ● Attractive uniform dark appearance
- ● Solvent-based
- ● No hydrogen embrittlement
- ● Free of harmful heavy metals such as Cr(VI), cadmium, cobalt, lead or nickel
APPLICATIONS:
- ● Suitable for dip-spin method
Excellent corrosion resistance with modern black design
Key features & Benefits:
- ● Organic black top coat
- ● Attractive, semi-bright black finish
- ● Excellent corrosion protection
- ● High color stability in combination with a black base coat
- ● Solvent-based with integrated lubricant
- ● Fulfilling the Volkswagen requirements for CoF even after multiple mounting and heat-loosening
- ● High chemical resistance
- ● Excellent handling – lowest abrasion, best adhesion
- ● Approved for Volkswagen TL180
APPLICATIONS:
- ● Suitable for dip-spin and spray
- ● Typically used for any kind of fasteners and other parts
Premium silver zinc flake basecoat A proven and reliable basecoat designed for consistent quality and outstanding protection. Zintek® 200 offers a bright metallic appearance, durable finish, and compatibility with various Techseal® and Zintek® topcoats.
Key features & Benefits:
- ● Inorganic silver premium zinc flake basecoat process
- ● Excellent cathodic corrosion protection
- ● Very good adhesion
- ● Attractive silver appearance
- ● Solvent-based
- ● No hydrogen embrittlement
- ● Free of harmful heavy metals such as Cr(VI), cadmium, cobalt, lead or nickel; non-PFAS version available
- ● Combinable with MKS’ Atotech topcoats
APPLICATIONS:
- ● Appropriate for fasteners, chassis parts, brake components, springs, and clips
- ● The process is suitable for a wide range of applications in the automotive, construction, heavy machinery,
and agriculture industries.
Property
Zinc Flake
PTFE
Zinc
Thermal
Spray
Alkaline Zinc
Alkaline Zinc Nickel
Hot-Dip Galvanizing (HDG)
Application
Method
Non-electrolytic
(Dip-Spin/Spray)
Spraying,
Coating
Thermal
SprayingVery Good to
Excellent
(Cathodic/Ba
rrier)
Electroplating
Electroplating
Immersion in Molten Zinc
Corrosion
Protection
Level
Excellent
(Cathodic/Barrie
r)
Good to
Excellent
(Barrier)
Very Good to
Excellent
(Cathodic/Ba
rrier)
Good
(Cathodic)
Superior
(Cathodic)
Excellent
(Cathodic/Barr
ier)
Thickness
Range
($\mu$m)
Thin (5-15)
Varies
greatlyGood to
Excellent
(Barrier)
Thick
(50-500)
Thin (5-20)
Thin (5-15)
Thick (45-200)
Unique
Selling
Proposition
(USP)
Absence of
Hydrogen
Embrittlement
Risk (Ideal for
high-strength
steel fasteners)
Extremely
Low
Coefficient
of Friction
(Non-Stick)
& Excellent
Chemical
Resistance
Ability to
Coat
Extremely
Large
Structures
On-Site
Exceptional
Throwing
Power and
Uniform
Coverage on
Complex
Parts
Highest
Corrosion
Resistance of
Electroplated
Coatings
(Often >1000
hrs salt spray)
Metallurgical
Bond & Most
Cost-Effectiv
e Long-Term
Solution for
Structural
Steel