Schulz Hartchrom GmbH Hamburg - Hartverchromen von Kolbenstangen und Rohren

Service & Contact: Phone: +49 40 822 9560 0
Hartverchromen von Kolbenstangen und Rohren Schulz Hartchrom GmbH
70 years metal processing in Hamburg



Our company is certified in acc. with DIN EN ISO 9001:2015. To monitor our own production as well as for testing customer products, we have continuously expanded our state-of-the-art laboratory with connected measuring chamber.

DIN EN ISO 9001:2015 Zertifikat – PDF [0.1 MB]

DIN EN ISO 9001DIN EN ISO 9001:2008

Different material testing cabinets/climatic test cabinets are available for short-time corrosion tests. We can test all standard DIN requirements demanded in galvanization technology in our facilities.



Various electrolytes are tested daily for their process capability in our in-house laboratory.
This quick internal monitoring allows us to always present correctly set electrolytes and thus produce quality-conform products.

In addition, daily wastewater samples are recorded by means of photometric analyses which guarantees environmentally-conform discharging.



The corrosion resistance of a layer or a layer system is the essential characteristic. The layer thickness, the porosity and the chemical properties of the coating material largely determine the corrosion resistance. This can be tested with so-called short-time corrosion tests.

In these tests, the workpieces to be tested are subjected to a corrosive atmosphere for a few days, which corresponds to several years in a normal atmosphere. The white and red rust formation within a certain number of hours serves to determine the corrosion resistance.

The following short-time corrosion tests are available in our company:


Layer measuring

Layer thickness measuring

There are numerous, physically quite different methods for measuring the layer thickness. The application field of the different methods mainly depends on the layer and basic material as well as on the layer thickness itself.

We offer the following methods:

Hardness measuring

Hardness is the resistance of a texture against the penetration of a harder test body.

We offer the following method:

Roughness measuring

Rough spots on surfaces are levelled during galvanisation while largely maintaining the geometrical shape. We mainly perform roughness measuring on hard chrome plated workpieces.

The following roughness values can be determined:


Environmental policy & wastewater treatment

The responsibility for environmental protection starts with the management. It defines the environmental policy and actively supports its observance to achieve sustained development. For surface finishing, environmental protection mainly means to detoxify hazardous wastewater from the electroplating shop to such an extent that the plant and animal life in natural bodies of water is not harmed in any way.

In our company, the wastewater (separated into different types) is subjected to a large internal continuous detoxification in treatment basins. The different types of wastewater are detoxified and neutralised with the corresponding chemicals. Afterwards, the suspended particles are removed in baffle plate thickeners. Then the cleaned water is discharged to the public sluice network.

Our aims are:

Discharge conditions for inorganic substances for the discharge of water from electroplating shops (Environmental Authority).
Our company’s environmental policy is checked in the scope of environmental company audits, discussed on the basis of management reviews, amended if necessary and passed.

Discharge conditions

for inorganic substances for the discharge of water from electroplating shops (Environmental Authority).:

Parameters: Limit values: Determination method:
Chromium VI 0,1 mg/l DIN 38405-D24
Chromium 0,5 mg/l DIN 38406-E22
Cadmium 0,1 mg/l DIN 38406-E 19-3
Copper 0,5 mg/l DIN 38406-E22
Nickel 0,5 mg/l DIN 38406-E22
Zinc 2,0 mg/l DIN 38406-E22
Cyanide 0,2 mg/l DIN 38405-D13-2
AOX 1,0 mg/l DIN 38409-H14
Sulphate 400 mg/l DIN 38406-D19
Free chlorine 0,5 mg/l DIN 38408-G4
pH-value 6,0-10,5 DIN 38404-C5
Umweltpolitik und Abwasserbehandlung
+49 40 822 9560 0
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