CORROSION

Annual damage due to Corrosion:

%

of The Netherlands’ GNP

Total damage in billion euro's

Corrosion

For The Netherlands around 17-18 billion euros per year are spent on corrosion damage. New calculations show that corrosion damages in the U.S. are even higher at around 6.2% of the country’s gross national product. Consequently, one would expect that corrosion damage is a major issue on every political agenda. Unfortunately, this is not the case.

Endures is dedicated to preventing corrosion and corrosion damage. Thanks to our long-standing experience worldwide, we have the engineers and experts to research corrosion damage as well as provide corrosion treatment and protection. We also have the expertise to assist you with product development, design and choice of material.

What exactly is corrosion?
The most common form is electrochemical corrosion, also known as wet corrosion. The definition of corrosion is:

Corrosion is an unwanted chemical or electrochemical degradation of a material.

or:

Corrosion is an (electro)chemical reaction of a material under influence of specific environmental conditions.

Nature strives for balance by maintaining a low energy level. People put extra effort and energy into products but the forces of nature often create corrosion damage. This unwanted process results in oxidation of metal. When the product is made of steel the process of oxidation is known as “rust.” The oxidation of steel by wet corrosion results in rust.

Corrosion prevention

To obtain high-quality prevention, it is necessary to understand the corrosion process and the different types and forms of corrosion. Wet corrosion has many different forms, and the following forms are very common:

  • Uniform corrosion
  • Galvanic corrosion
  • Selective corrosion
  • Filiform corrosion
  • Intergranular corrosion
  • Pit corrosion or pitting
  • Crevice corrosion
  • Stress corrosion
  • Erosion corrosion
  • Microbiological influenced corrosion (MIC)

Galvanic Corrosion

A common form of wet corrosion is galvanic corrosion. Galvanic corrosion occurs when a metal comes into contact with another metal (direct or indirect) through an electrolyte, and the potential difference between both metals is equal to or greater than 0,2V (depending on the conductivity and aggressiveness of the environment). In such a case, one metal sacrifices in favor of the other metal.

When this process is unwanted, it is known as galvanic corrosion. It can also be used on purpose, in which case it is called “cathodic protection.” An example of galvanic corrosion is: Galvanic corrosion of aluminum and stainless steel in seawater, where aluminum dissolves to protect the stainless steel.

Prevention of galvanic corrosion 
Galvanic corrosion can be prevented by:

/

Connecting a third (more anodic) metal which is  “sacrificial” to the other two, so both metals remain intact (Cathodic protection).

q

Avoid direct metallic contact (use electric insulation);

f

Choose metals  that are close to each other in the potential range.

 

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News

Classification of corrosivity of liquids to metals

New chemical products offered for transport are subjected to the classification procedures according the Model regulations issued by United Nations (ST/SG/AC.10/1/Rev.16). Corrosive substances of Class 8 (“Liquids and solids which may become liquid during transport,...

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