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Zinc flake coatings

Overview

What is Zinc Flake Coating?

Zinc flake coatings consist of a combination of zinc and aluminum flakes suspended in a binder or resin matrix. The flakes form a layered structure on the surface, creating a barrier that shields the metal from environmental factors such as moisture, salt spray, and chemicals. This layered structure also offers cathodic protection to the underlying metal, which means that even if the coating is damaged or scratched, the zinc flakes sacrificially corrode instead of the metal substrate, providing an added level of protection.

These coatings are typically applied using a spray or dip process and then cured through heat or air drying. They can be used as standalone coatings or as part of a multilayer coating system, where they serve as a base layer for additional paint or powder coatings.

What is GEOMET ®

GEOMET coating film has a silver-metallic look. Layers of metal flakes are connected with one another through the use of a special inorganic binder.Because the film is extremely thin-only about 8um-it won’t negatively affect the optimal fit between bolts and nuts.
2C2B is the standard manufacturing process.

How it works?

Barrier effect

The positioning of the zinc flakes gives the film a barrier effect that isolates the metal from the corrosive environment. Indeed the flake morphology increases the length of the path that the aggressive substances must travel to reach and corrode the substrate.

Sacrificial protection

When steel is coated with zinc flake, cathodic protection is achieved. Because of its lower electrochemical potential, compared to iron, zinc oxidizes preferentially: it “sacrifices” itself to protect the steel substrate.

Self Healing

The cathodic protection of zinc produces various kinds of salts (oxides, hydroxides, carbonates…), also known as “white rust”. Thanks to their mobility and adherence properties, these compounds heal the damaged areas of the coating and therefore act as a corrosion inhibitor to protect the substrate.

Adhesion to substrate

Our zinc flake sol-gel binders create strong covalent bonds with the substrate, which ensures excellent adhesion. In addition, at the interface, the migration of corrosion precursors (O2 and H2O) becomes more difficult, which reinforces the barrier effect of the coating.

Benefits of Zinc Flake Coating:

Exceptional Corrosion Resistance:

The zinc flake layer acts as a sacrificial barrier, providing outstanding corrosion protection to the underlying substrate. It offers superior resistance against moisture, chemicals, salt, and other corrosive elements, thereby significantly extending the lifespan of coated products.

Uniform Coating Thickness:

The application of zinc flake coating ensures consistent and uniform thickness across complex geometries, including recessed areas and threaded surfaces. This ensures comprehensive coverage and protection for all parts of your products, even those with intricate designs.

High Temperature Performance:

Zinc flake coatings are designed to withstand high-temperature environments, making them suitable for applications where exposure to heat is a concern. This makes the coating ideal for automotive, aerospace, and industrial components.

Low Environmental Impact:

Zinc flake coatings are environmentally friendly, as they are free from harmful heavy metals like lead and chromium. Additionally, the coating process itself involves minimal waste generation and can be easily applied using eco-friendly techniques.

Versatile Application:

Zinc flake coatings can be applied to various substrates, including steel, aluminum, and other metal alloys. This versatility makes it an excellent choice for a wide range of industries, such as automotive, construction, marine, and oil and gas.

GEOMET ®

GEOMET® 720

Corrosion protection

GEOMET® 720 alone or in combination with our range of topcoats passes the most severe 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 um and from 1 to 3 layers depending the type of application process to meet the expected performance.

^ Results depend on substrate, geometry of parts and type of application processes.

720-2000 h

(ISO 9227/ASTM B117)

Temperature resistance

Performances maintained up to 350°C.

Static friction

Static friction coefficient > 0.20. (ISO16047)

Electrical properties

Conductive and offers perfect galvanic properties to avoid bimetallic 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.

GEOMET® 321

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 the type of application process) to meet the expected performance.

720-2000 h

(ISO 9227/ASTM B117/JIS Z2371)

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 bimetallic 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.

GEOMET® 500

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.

720-2000 h

(ISO 9227/ASTM B117/JIS Z2371)

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 bimetallic 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.

ZINCROKOTE®

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:

1 basecoat coat + 1 topcoat coat

Thin dry film, non electrolytic

  • 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 REACH

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

Topcoats

Torquer Series

Preventing looseness / Cost reduction / Weight reduction The Torquer Series is effective in every situation

Increasing the size and number of bottles is not enough to prevent loosening.

Combined with our zinc flake basecoats, ECHOTE® WH700 reacts and creates a barrier effect that improves both the corrosion resistance of the system and the galvanic corrosion protection with aluminum and different noble metals.

The most effective way to prevent loosening is to stabilize the coefficient of friction and exert an appropriate tightening axial force.

01. Stable fasteninig axial force prevent looseness

When the friction coefficient it stable, it is possible to obtain a stable tightening axial force without any variantion in all bolts when tightening with the same tightening torque.

02. A stable friction coefficient

Applying the Torquer Series reduses the variation in the friction coefficient and makes it stable. We offer 3 types of lineups that allow you to choose the one that suits your needs best.

03. Maximize the utilization of bolts without sacrificing performance

When the tightening torque is 20N*m, with M8 x 1.25 bolts (strength classification 6.8), only 7KN of tightening axial force can be obtained with non-lubricated bolts. However, when Neotorquer is applied, a tightening axial force of 17KN can be obtained.

In this way the Torquer series can maximize bolt performance.

04. No more increasing the size ir the number of bolts

Until now, it was necessary to increase the size and number of bolts in order to obtain the required tightening axial force. By using the Torquer series, more tightening axial force can be obtained. As a result, it is possible to reduce the size and number of bolts, thus reducing both the cost and the overall weight.

PLUS® VL

Lubrication

PLUS® VL allows to obtain a stable and controlled friction coefficient in the range of 0.09-0.14.

0.09-0.14

Coefficient of friction (ISO 16047)

Corrosion
protection

Combined with our zinc flake basecoats, PLUS® VL reacts and creates a barrier effect that improves both the corrosion resistance of the system and the contact corrosion with aluminum and other materials.

Chemical
resistance

Resistance to industrial solvents and automotive fluids.

Color tracing

PLUS® VL can be colored for part visual identification and differentiation.
 

No hydrogen embrittlement

Implemented via non-electrolytic application processes. This avoids the hydrogen embrittlement phenomenon that causes cracking of metals.

PLUS® VLh

Lubrication

PLUS® VLh allows to obtain a stable and controlled friction coefficient in the range of 0.09-0.14. It provides outstanding tribological performances and stability regarding multi-tightening with various counterparts materials (cataphoretic paint, aluminum alloys, cast iron and steel) while avoiding stick-slip problems. It also offers excellent behaviour in loosening tests, including at high temperature.

0.09-0.14

Coefficient of friction (ISO 16047)

Corrosion
protection

Combined with our zinc flake basecoats, PLUS® VLh reacts and creates a barrier effect that improves both the corrosion resistance of the system and the contact corrosion with aluminum and other materials.

Chemical
resistance

Resistance to industrial solvents and automotive fluids.

Color tracing

PLUS® VLh can be colored for part visual identification and differentiation.

No hydrogen embrittlement

Implemented via non-electrolytic application processes. This avoids the hydrogen embrittlement phenomenon that causes cracking of metals.

PLUS® ML

Lubrication

PLUS® ML allows to obtain a stable and controlled friction coefficient in the range of 0.10-0.16. It provides outstanding tribological performances and stability regarding multi-tightening with various counterparts materials (cataphoretic paint, aluminum alloys, cast iron and steel) while avoiding stick-slip problems. It also offers excellent behaviour in loosening tests, including at high temperature.

0.10-0.16

Coefficient of friction (ISO 16047)

Corrosion
protection

Combined with our zinc flake basecoats, PLUS® ML reacts and creates a barrier effect that improves both the corrosion resistance of the system and the contact corrosion with aluminum and other materials.

Chemical
resistance

Resistance to industrial solvents and automotive fluids.

Color tracing

PLUS® ML can be colored for part visual identification and differentiation.

UV tracing

PLUS® ML can be functionalized with a UV tracer for part visual identification and differentiation.

No hydrogen embrittlement

Implemented via non-electrolytic application processes. This avoids the hydrogen embrittlement phenomenon that causes cracking of metals.

PLUS® ML Black

Lubrication

PLUS® ML Black allows to obtain a stable and controlled friction coefficient in the range of 0.10-0.16 when applied on GEOMET® 321 or GEOMET® 720. It provides outstanding tribological performances and stability regarding multi-tightening with various counterparts materials (cataphoretic paint, aluminum alloys, cast iron and steel) while avoiding stick-slip problems. It also offers excellent behaviour in loosening tests, including at high temperature.

0.10-0.16

Coefficient of friction (ISO 16047)

Cosmetic

Very uniform and aesthetic black finish (2 layers needed when applied via bulk dip/spin on GEOMET® 321, GEOMET® 500 or GEOMET® 720, 1 layer when applied on GEOMET® 430).

Corrosion
protection

Combined with our zinc flake basecoats, PLUS® ML Black reacts and creates a barrier effect that improves both the corrosion resistance of the system and the contact corrosion with aluminum and other materials.

Chemical
resistance

Resistance to industrial solvents and automotive fluids.

No hydrogen embrittlement

Implemented via non-electrolytic application processes. This avoids the hydrogen embrittlement phenomenon that causes cracking of metals.

PLUS® M

Lubrication

PLUS® M allows to obtain a stable and controlled friction coefficient in the range of 0.12-0.18.

0.12-0.18

Coefficient of friction (ISO 16047)

Corrosion
protection

Combined with our zinc flake basecoats, PLUS® M reacts and creates a barrier effect that improves both the corrosion resistance of the system and the contact corrosion with aluminum and other materials.

Temperature
resistance

Combined with our zinc flake base coats, PLUS® M reacts and improves their temperature resistance by raising it to 400°C.

Chemical
resistance

Resistance to industrial solvents and automotive fluids.

No hydrogen embrittlement

Implemented via non-electrolytic application processes. This avoids the hydrogen embrittlement phenomenon that causes cracking of metals.

PLUS XL

Lubrication

PLUS® XL allows to obtain a stable and controlled friction coefficient in the range of 0.06-0.09, which is the lowest of our portfolio. It provides outstanding tribological performances and stability regarding multi-tightening with various counterparts materials (cataphoretic paint, aluminum alloys, cast iron and steel) while avoiding stick-slip problems. This topcoat is also perfectly adapted to torque + angle tightenings.

0.06-0.09

Coefficient of friction (ISO 16047)

Corrosion
protection

Combined with our zinc flake basecoats, PLUS® XL reacts and creates a barrier effect that improves both the corrosion resistance of the system and the contact corrosion with aluminum and other materials.

Chemical
resistance

Resistance to industrial solvents and automotive fluids.

No hydrogen
embrittlement

Implemented via non-electrolytic application processes. This avoids the hydrogen embrittlement phenomenon that causes cracking of metals.

PLUS L

Lubrication

PLUS® L allows to obtain a stable and controlled friction coefficient in the range of 0.08-0.14. It provides outstanding tribological performances and stability regarding multi-tightening with various counterparts materials (cataphoretic paint, aluminum alloys, cast iron and steel) while avoiding stick-slip problems.

0.08-0.14

Coefficient of friction (ISO 16047)

Corrosion
protection

Combined with our zinc flake basecoats, PLUS® L reacts and creates a barrier effect that improves both the corrosion resistance of the system and the contact corrosion with aluminum and other materials.

Chemical
resistance

Resistance to industrial solvents and automotive fluids.

Color tracing

PLUS® L can be colored for part visual identification and differentiation.

No hydrogen embrittlement

Implemented via non-electrolytic application processes. This avoids the hydrogen embrittlement phenomenon that causes cracking of metals.

Plus 10

Corrosion protection

PLUS® 10 reacts and creates a barrier effect that improves both the corrosion resistance of the system and the contact corrosion with aluminum and other materials.

Chemical resistance

Resistance to industrial solvents and automotive fluids.

No hydrogen embrittlement

Implemented via non-electrolytic application processes. This avoids the hydrogen embrittlement phenomenon that causes cracking of metals.

GEOMETPLUS® JL Blue

Lubrication

GEOMETPLUS® JL Blue allows to obtain a stable and controlled friction coefficient in the range of 0.14-0.20 when applied on GEOMET® 720 & GEOMET® 720HP. It provides outstanding tribological performances and stability while avoiding stick-slip problems.

0.14-0.20

Coefficient of friction (ISO 16047)

Corrosion protection

Combined with our zinc flake basecoats, GEOMETPLUS® JL Blue reacts and creates a barrier effect that improves both the corrosion resistance of the system and the contact corrosion with aluminum and other materials.

Chemical resistance

Resistance to industrial solvents and automotive fluids.

GEOMETPLUS® JL Black

Lubrication

GEOMETPLUS® JL Black allows to obtain a stable and controlled friction coefficient in the range of 0.17-0.23 when applied on GEOMET® 321, GEOMET® 720 & GEOMET® 720HP. It provides outstanding tribological performances and stability while avoiding stick-slip problems.

0.17-0.23

Coefficient of friction (ISO 16047)

Coloration

Can get uniform black color by 2coats 2bakes

Corrosion
protection

Combined with our zinc flake basecoats, GEOMETPLUS® JL Black reacts and creates a barrier effect that improves both the corrosion resistance of the system and the contact corrosion with aluminum and other materials.

Chemical
resistance

Resistance to industrial solvents and automotive fluids.

ECHOTE® WH700

Lubrication

Coefficient of friction of ECHOTE®WH700 is kept lower to drive screws faster.

Corrosion
protection

Combined with our zinc flake basecoats, ECHOTE® WH700 reacts and creates a barrier effect that improves both the corrosion resistance of the system and the galvanic corrosion protection with aluminum and different noble metals.

Chemical
resistance

Resistance to insecticide and fungicide agent for wood

Coloration

ECHOTE®WH700 can be colored for part visual identification and differentiation.

Scratch
Resistance

ECHOTE® WH700 has a good scratch resistance performance against to mechanical damaged area.

Solid Films and Dry Films Lubricants

Gleitmo-HMP
O-Rings-Gleitmo