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Corrosion Protection

Suitable materials and effective corrosion protection for economical solutions

The right choice of material for screens and screening machines is a key factor for their reliable and low-maintenance operation.

For applications with river water and fresh water, we use 304 and 316L stainless steel. For applications in particularly corrosive seawater with high temperature and salinity, we use stainless steel in combination with corrosion protection as well as corrosion-resistant duplex stainless steel and super duplex stainless steel. All steel parts are pickled and passivated in our own production.

For corrosion protection we choose between two principles, cathodic corrosion protection with external current and corrosion protection with sacrificial anodes.

Water intake for cooling and process water recovery in Germany with a combination of coarse and fine screening
The right corrosion protection must be considered early in the planning and design phase.
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Protection of equipment

HUBER solutions für corrosion protection

Cathodic corrosion protection with external current

Impressed Current Cathodic Protection (ICCP) is a proven system for protecting stainless steel against electrochemical corrosion.

The basic principle is that the metal to be protected – the protected object – is turned into a cathode, which does not corrode.

For cathodic corrosion protection with external current, HUBER works together with a globally recognised specialist. We design and manufacture the system components taking into account the site and installation environment as well as the prevailing operating conditions for the specific project application.

Corrosion protection with sacrificial anodes

Corrosion protection can also be achieved by using galvanic anodes, the so-called sacrificial anodes. These consist of an electrochemically less noble metal, usually aluminium, zinc or magnesium, which is connected to the protected object through the seawater acting as an electrical conductor. The decisive factor for effective corrosion protection is that the sacrificial anodes are either mounted directly on the protected object or are directly connected to it via a metal cable.

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FAQ

Frequently Asked Questions

Impressed Current Cathodic Protection (ICCP) is a proven system for protecting stainless steel against electrochemical corrosion.

The basic principle is that the metallic object to be protected is made a cathode which does not corrode. This is achieved by continuously supplying electrons to the metal via an external current system. The system consists of several reference electrodes and several anodes. The anodes are connected to a power supply unit and emit the protective current into the conductive water. Almost all surfaces of the protected object immersed in the water are reached by the protective current.

The reference electrodes measure the electrical protection potential and, based on this data, the power supply unit automatically regulates the required power at the anodes. The protective current given via the anodes leads to a change in potential on the surface of the protected object and prevents the corrosion process.

Advantages of cathodic corrosion protection with sacrificial current are that relatively large surfaces and structures are effectively protected, comparatively few anodes are required and the applied voltage adapts to changing environmental conditions.

Corrosion protection can also be achieved by using galvanic anodes, the so-called sacrificial anodes. These consist of an electrochemically less noble metal, usually aluminium, zinc or magnesium, which is connected to the protected object through the seawater acting as an electrical conductor. The decisive factor for effective corrosion protection is that the sacrificial anodes are either mounted directly on the protected object or are directly connected to it via a metal cable.

The less noble material of the sacrificial anode oxidises and gives off its electrons, which flow as a protective current to the protected object. The object acts as a cathode, so to speak. The sacrificial anode dissolves during the process and protects the protected object from corrosion.

Sacrificial anodes must be replaced at the end of their service life, which is usually after a period of 2 to 5 years. They have the advantage of relatively low material costs, they are relatively easy to install and do not require a power source. In addition, they are suitable for localised protection and are less susceptible to interaction with neighbouring structures. A disadvantage is the lack of control and direct measurability compared to cathodic protection with external current.

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If you have any questions, please do not hesitate to contact us!

We welcome your enquiries and want to offer you the best possible support for your projects.

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