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Finishing aluminum

Anodizing, hard anodizing, chromating and passivating aluminium - we have been focusing on these services since 1947. Our top quality is based on experience, top technology and care.

These strengths shape our profile:

Maximum color palette

We offer the widest range of colors and give aluminum rich, homogeneous color surfaces. We are unbeatable at this.

Big on the smallest parts

Parts just a few millimeters in size: Only a few suppliers can cope with this at all and  cannot guarantee reliable surface quality.  The gentle and economical clamping of small parts requires years of practice and experience. On the other hand, our range extends up to parts with a length of 1,500 mm.

Over Night Service

We can do even the seemingly impossible. Sometimes it has to be overnight.  Your appointment request has priority. We are committed, flexible and reliable.

In-house laboratory

Continuous analyses guarantee consistency and reliable quality at the highest level.

In-house rack construction

An important aspect when it comes to a smooth workflow, speed and cost-effectiveness. We build our individual frames from titanium or aluminum ourselves.

Dedicated team

Everyone is highly motivated and puts their heart and soul into their work. Professional expertise is a matter of course.

Automation

Fast, safe and scalable. We rely on machine support, especially for loading and unloading.

Sustainable processes

There are no compromises when it comes to environmental protection and resource conservation.

Competitive prices

Our calculations are transparent and comprehensible. If you want quality, you get fair prices on top.

Anodizing

01 black
01 black
02 dark grey
02 dark grey
03 light gray
03 light gray
04 natural
04 natural
05 brass
05 brass
06 nickel silver
06 nickel silver
07 gold
07 gold
08 dark orange
08 dark orange
09 orange
09 orange
10 red orange
10 red orange
11 light red orange
11 light red orange
12 bordeaux red
12 bordeaux red
13 pink
13 pink
14 purple
14 purple
15 light purple
15 light purple
16 green
16 green
17 light green
17 light green
18 neon green
18 neon green
19 blue
19 blue
20 light blue
20 light blue
Download color palette
Bild von farbigem Aluminiumobjekt

Color transforms aluminum. Nuances are often decisive.

We offer our customers the widest range of colors and the deepest spectrum of shades and effects: From delicate pastels to brilliantly luminous tones. From a golden shimmer to a silver glow. We are happy to respond to individual wishes.

Surfaces as hard as steel

Hard anodizing ...

Hard anodizing (also known as hard coating) gives aluminium parts an extremely durable, protective surface. The new degree of hardness also ensures excellent corrosion resistance. In addition, the aluminum oxide of the hard anodized layer provides electrical insulation.

Chromating gives aluminum
new capabilities

Chromating is an electroless, chemical surface treatment of aluminum with chromium-containing chemical solutions. This creates inorganic layers that serve as an excellent adhesive base for organic coatings and offer improved corrosion protection without additional painting. Chromating also improves the running-in and sliding properties during forming. 

We offer the following variants of chromating:

Alodine yellow (1200) not ROHS-compliant = contains chromium-6
Alodine white (401/45) ROHS-compliant = contains chrome-3

Classes:

Class 1A
  • For maximum protection against corrosion
Class 3
  • For protection against corrosion when low electrical
    resistance is required

Another variant of surface finishing is passivation with SurTec 650.

Passivation - creating the best conditions

We passivate or chromate with SurTec 650 chromitAL TCP.

The result:

  • chromium(VI)-free passivation for aluminum.
  • Excellent corrosion protection, comparable to hexavalent passivations.
  • low surface resistance: <5000 µOhm per square inch according to MIL-DTL-B1706B.
  • SurTec 650 is suitable for high-alloyed aluminum, castings and forgings.
  • SurTec 650 is very well suited as an adhesion primer for paints, powder coatings and adhesives, approved by GSB and QUALICOAT.
  • SurTec 650 produces slightly iridescent visible layers.
  • SurTec 650 fulfills the corrosion protection requirements according to MIL DTL 5541F and MIL-DTL-81706B.

Multi-layered customer structure

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Medical technology

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Mechanical engineering

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Aviation and aerospace

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Electrotechnology

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Automotive

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Defense technology

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Watch industry

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Furniture industry

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Bicycle industry

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Optical industry

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Robotics Automation technology

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Lighting technology

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Air pressure and hydraulics industry

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Racing

Our customers come from a wide range of industries. What they all have in common are the high quality requirements and the omnipresent deadline pressure.

Important for many of our customers: We are certified according to DIN EN ISO 9001:2015
Here you can download the certificate as PDF.

Maximum tradition

These were the years of reconstruction after the Second World War. The married couple Else and Egon Hohl started surface finishing of metals in 1947. Initially mainly for the neighboring jewelry industry. They soon focused on anodizing and chromating aluminium.

New markets were opened up and automotive brands such as Porsche and Volkswagen were supplied.

Several relocations took place and the technology was constantly developed further. Today, HOHL is a modern company with innovative technology, consistent customer orientation and firmly rooted values.