Electrochemical Corrosion Protection

... or corrosion protection by electrochemical water treatment

The corrosion protection by using the elector-corrosion-protection devices is an eco-friendly alternative for corrosion protection in water-systems, which replaces the use of chemical inhibitors or oxygen scavengers. elector devices are designed for

Corrosion Protection

Corrosion protection in heating systems


Corrosion protection in tap water systems

Korrosionsschutz für industrielle Kühl- und Heißwassersysteme

Corrosion protection in industrial cooling and heating systems

The applications of electrochemical methods for water treatment vary from water purification, water disinfection and preparation of ultrapure water, to the change of water composition for corrosion protection in water systems, such as heating systems or water systems.

Electrochemical methods use the chemical reactions of the water and in it dissolved substances that occur when applying an electrical current. Depending on the system configuration, different results are achieved - such as a water quality which contributes to the protection of metals against corrosion.

The diversity of electrochemical methods is based on the enourmous progress that scientists from various disciplines have achieved in the recent years. However, there is an increasingly demand for environmentally friendly methods for water treatment that has led to a renaissance and further development of traditional electrochemical methods. Laws an regulations sometimes prohibit the use of chemicals for water treatment, as an intensive use could harm aquatic habitats and could cause other interferences.

Electrochemical methods are an alternative - environmentally friendly, safe and easy to use.

Voltaic Pile
The Voltaic pile, the ancestor of today's batteries, consists of several galvanic elements of copper and zinc. Corrosion protection devices from elector are also based on a galvanic element.

Corrosion protection by electrochemical water treatment – a method with a long history

Even before the invention of the voltaic pile, which was constructed around 1800 by Alessandro Volta, researchers dealt with the complex relationships between chemical and electrical phenomenas in conjunction with water. Already in 1789 results were announced, according to which the water can be decomposed by electricity in inflammable air and vital air – a technique which is nowadays known as the electrolysis of water, which is used for production of hydrogen (inflammable air) and oxygen (vital air).

The discovery of water electrolysis comes along with the knowledge of galvanic cells. Galvanic cells make use of the different electrochemical potential between two metals. When two different metals are electrically connected and immersed into an electrolyte (eg water) an electrical voltage arises in a natural way. This knowledge led to the invention of the voltaic pile, consisting of several combined galvanic cells, and secondly in inventions such as the cathodic corrosion protection, corrosion protection by means of electrochemical water treatment and in industrial coating technologies - the electroplating technology.

Thanks to a number of researchers there is the knowledge about the chemical composition of water molecules, how gases, metals and other impurities dissolve in water and which chemical reactions are caused, if an electrical current flows through the water. Today it is known that for certain different reactions in the water defined voltages, additional salts or special metals as electrodes are required.

The majority of the electrochemical water treatment methods are based on electrolysis. Reactions in the water are caused by applying an external power source to the electrodes. The current, the electrode material and the design of the electrolysis cell significantly influence the result of the electrolytic water treatment.

The water is also exposed to an electric voltage, if an galvanic cell is generated from the connection of different metals in contact with water. The result is similar, but requires no external power. The electrode material and design are crucial for the achievable voltage and thus the effect on the water and its constituents.

Over the last hundred years, many inventors dealt with the topic, as water can be cleared of contaminants by electrochemical reactions. Many patents provide information, that problems in conjunction with the use of water can be prevented by use of electrochemical methods. Whether to clean drinking water, prevent problems with limescale or prevent rust and corrosion in heating systems – the potential applications are extensive.

Water treatment device from Butler
Device with galvanic element for corrosion protection in water systems from 1950 by Butler. The engineer Butler developed many types of electrochemical water treatment devices that were primarly used for corrosion protection in cooling systems of large internal combustion engines.

elector succeeds with the elector-corrosion-protection devices the research done by the US-American Butler, who explained the basic functionality of the corrosion protection by means of electrochemical water treatment and who developed several corrosion protection devices during the 1940's and 1950's. Butler and previous researchers have shown that piping systems are protected from corrosion and rust, if the water is treated electrochemically by a galvanic cell.

Corrosion is a matter of water quality!

By the electrochemical water treatment with the elector devices crucial parameters of the water can be affected positively:

  • the water is cleaned from disturbing impurities
  • the pH of the water is stabilized
  • dissolved corrosive gases (eg oxygen) are bound
  • the electrical conductivity of the water is reduced
  • a corrosion protective atmoshpere is built up - the natural protective layer formation on metals is supported.
Corrosion-protection device elector XS5
Corrosion-protection device elector XS5 for corrosion protection in heating systems

The elector-corrosion-protection devices can be used for corrosion protection in closed water systems and open water systems – thus to protect against corrosion in circulating water systems or for corrosion in water systems with continuous water consumption.

The electrochemical corrosion protection is not only as a single solution a good method. The elector-corrosion-protection devices fit perfectly into preventive activities against scale formation and corrosion in water systems. In case of a high hardness of the make-up water a deionisation, also called demineralisation, is recommended.

Due to the demineralisation of the make-up water all the minerals are removed and thus the formation of scale is prevented. Furthermore, the first real step towards corrosion protection is done, as demineralised water has a low conductivity. The only problem: Demineralised water is acidic to neutral, which is characterised by a low pH. This problem is solved with the elector-corrosion-protection devices – the pH of the water is stabilised in the alkaline range as a result of the electrochemical water treatment.

Wether to clean up silted underfloor heating or for preventive corrosion protection - elector is the environmentally friendly alternative. Easy to use, cost saving, tested many times!