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Electro-dip painting (ETL)

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Electro-dip painting (ETL)

If an aqueous dip coating is deposited in a bath on electrically conductive work-pieces by applying a DC voltage, this is referred to as electro dip coating. Depending on the polarity of the work-piece, a distinction is made between anodic electro-coating (ATL) and cathodic dip painting (KTL). The process is mainly used for bulk goods, e.g. in car and truck series production. 

In the automotive industry, cathodic deposition systems have largely been used since the mid-1970s.

The aqueous paint contains only low concentrations of organic solvents and consists mainly of binder and pigment paste  The resins of the binder are converted into ions in their chemical structure by reaction with acids or bases. Thus they are water-soluble and can be deposited as cationic (in the case of cathodic dip painting) resins on the correspondingly polarised work-piece.

In cathodic dip painting, the component is negatively polarised (cathode), while anode plates are located in the area of the basin wall.  The contacted, fully immersed work-piece attracts the charged paint particles and builds up a very uniform coating film on its entire surface.  For this it is important that the composition of the paint bath is permanently controlled and that it is adjusted to the desired deposition and system conditions during bath maintenance. The coated components are then cross-linked and cured in the furnace at an object temperature of between 185 and 200°C. The coating is then applied to the components and the coating is applied to the surface.  Typical layer thicknesses in the range of 8 - 35 µm can be achieved.  Different plant technologies allow components to be either individually suspended from racks or coated as bulk material in drums.


Misc pages

Curing in process
Conveyor belt oven (continuous oven)
Tray oven (continuos oven)
Chain conveyor oven
Chamber oven
Drying process
Cooling (after annealing)
Exhaust air treatment
KTL breakdown voltage
Condensed water test according to DIN EN ISO 6270-2
Sacrificial anode
Local element
Surface protection
Hot-dip galvanising
Flame spraying
Galvanic coating
Conversion layer
Dry-film coat thickness
Fastening properties
Gloss level
Artificial weathering test
Test procedures
Surface properties
Chemical resistance
Mechanical resistance
Natural weathering test
Physical properties
Passiveness, passive state
Protection, galvanic
Protection, temporary
Chromate Coating
Passivation coating
Rack coating
Bulk process
Partial production lot
Drum coating
Erichsen ball recess
Coating thickness, total
Coating thickness, local
Coating thickness, reference
Coating weight
Dry to the touch
Reference surface
Spray coating
Electroplated coating
Specific surface
Passive corrosion protection
Inorganic protective coatings
Organic protective coatings
Active corrosion protection
Forms of corrosion
Types of corrosion
Surface corrosion
Shallow pitting corrosion
Pitting corrosion
Contact corrosion
Bimetallic corrosion
Stress corrosion cracking
Hydrogen induced cracking
ISO 9001
Electro-dip painting (ETL)
Electrostatic powder spraying (EPS)
ISO 14001
Trueness of gauge
Coefficient of friction
Setting behaviour
Fastening and assembly
Kesternich test
Material effectiveness
Environmental management
Quality management
Magnetic induction measurement
Scaling protection
Powder coating
Coil coating
X-ray fluorescence analysis
Beta backscatter method
Mandrel bend test
Eddy current method (phase sensitive)
Eddy current method (amplitude sensitive)
Corrosion College
Powder sintering process
Zinc flake coatings
Dip coating process
Stone impact test
Process stages of KTL-seperation
Corrosion testing atmospheres conducive corrosion
Coat thickness and coat thickness measurement
Adhesion test according to DIN EN ISO 10683
Cross-cut test for adhesion
Thread tolerance
Pressure water jetting test
Fertiliser resistance
Anodic dip coating (ADC)
Cathodic dip coating (CDC)

Technical terms can not always be avoided. As corrosion experts, we not only want to give you comprehensive advice, we are also interested in making you a corrosion expert yourself.

The variety around the topic of corrosion and corrosion protection is also in our glossary at home: explanations from A as in Adhesion to T as in Thread tolerance. Have fun clicking through!