TECHNO-COAT

Oberflächentechnik GmbH

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Galvanizing

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Electrogalvanizing - The process

Electrolytically deposited zinc coatings are still one of the most important and economical galvanic coatings for corrosion protection of metallic components. In combination with various post-treatments, such as chromium VI-free passivation and optional sealants, standards-compliant standards can be achieved.
The process we use also has a high decorative value due to its gloss level. It goes without saying that our processes are REACH and RoHS compliant.

Advantages of electrogalvanizing

  • Zinc coating provides targeted protection against corrosion (cathodic corrosion protection)
  • Wide range of indoor and outdoor applications thanks to appropriate post-treatments
  • Suitable for threads due to low coating thickness of 8 to 25 µm (depending on customer requirements)
  • Ideal for assemblies and welded constructions due to the low temperature (low distortion of large sheet metal parts)
  • Layer thickness can be controlled by specific control of various parameters (current flow, rack technology)
  • the most favorable corrosion protection compared to other electrodeposited coatings for surface finishing
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Where is electrogalvanizing used?

Automotive
Decorative products
Machinery and plant engineering

Are you looking for a partner for galvanizing?

Then get in touch with us now. We look forward to dealing with your request individually.

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For every application - our passivations

As pure zinc is not resistant in the atmosphere and would develop white rust shortly after coating, a protective passivation is applied afterwards. We offer this post-treatment in various versions, tailored to the area of application:

Passivation type Color Field of application Corrosion resistance to base metal corrosion Designation according to DIN EN ISO 19598
Thin film/blue passivation bluish silver Indoor use, no corrosive environment 72 - 120 h Fe//Zn8-12//An//T0
Yellow passivation yellowish iridescent Indoor and outdoor areas 216 - 336 h Fe//Zn8-12//Cn//T0
Thick film passivation bluish iridescent Indoor and outdoor areas 216 - 336 h Fe//Zn8-12//Cn//T0
Thick-film passivation with sealing bluish Indoor and outdoor areas 264 - 480 h Fe//Zn8-12//Cn//T2

Why with Techno-Coat?

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Everything from a single source

In addition to electrogalvanizing, we offer a wide range of different surface finishing processes. A combination of different processes or mechanical processing is also possible.

Speed

We are characterized by flexibility and speed. A delivery time of just a few days is usually possible. Thanks to our own frame construction, fast and economical solutions can also be found for difficult component geometries.

Diversity

In order to be able to process the widest possible range of different geometries and component shapes, we have the option of processing the components as rack/turned rack goods or as barrel goods, depending on requirements.

Many years of experience

Benefit from our many years of experience.

High quality standards

Expect the highest quality! The satisfaction of our customers is our top priority. We have been ISO 9001 certified for many years and live by the principle of continuous improvement.

How we galvanize - The process

1

Mechanical cleaning

Depending on the delivery condition, mechanical pre-treatment (blasting, brushing) may be necessary to remove unwanted impurities or residues from previous processes. This is particularly recommended for weld seams.

2

Decoction degreasing

In this step, process fluids such as drilling and cutting oils, deep-drawing greases etc. are removed.

3

Cascade sink

This is where the chemical residues are neutralized. This process step takes place after every active bath.

4

Pickling

The metal surface is freed from existing corrosion. Various additives ensure that the base material is largely unaffected.

5

Electrolytic degreasing

Electrolysis creates small bubbles on the surface. These cause fine cleaning by blasting off dirt particles.

6

Activation

This process step removes existing passive layers and activates the surface for subsequent galvanizing.

7

Galvanizing

Pure zinc is brought into solution by electrolysis and deposited as a zinc layer on the component to be coated by excess electrons via an aqueous phase.

8

Lighten

To produce homogeneous passive layers, the components are brightened with a diluted acid in this process step.

9

Aftercare

The various passivations protect the applied zinc layer from corrosion, which further increases the durability of the coating. Optionally, this effect can be further enhanced by a final sealant. Finally, the components are dried in a hot air dryer.

Frequently asked questions

Galvanizing has the following advantages as a surface finishing process:

  • Low layer thickness between 8 - 25 μm
  • Zinc coating protects the component from corrosion
  • Can be used indoors and/or outdoors depending on the post-treatment
  • Low process temperatures
  • Uniform appearance and decorative effect thanks to high gloss level
  • Very inexpensive compared to other corrosion protection coatings

The following disadvantages must be taken into account when galvanizing:

  • galvanically applied zinc coatings are not resistant to acids and alkalis
  • The process can lead to hydrogen becoming embedded in the surface (hydrogen embrittlement), which can be removed by subsequent heat treatment

Low-alloy steels, spring steels, hardened steels and cast steel are mainly suitable for electrogalvanizing.

The goods window is 2000 x 400 x 700 mm with a maximum weight of 150 kg. Depending on the geometry, larger components can also be galvanized by arrangement.

Please do not hesitate to contact us.

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