sisTec Produktuebersicht03

MICROBIOLOGICAL INFLUENCED CORROSION (MIC) IS CAUSING BILLIONS WORTH OF DAMAGES

Corrosion caused by bacteria (MIC) is hardly known to the public, and even experts in many industries are only starting to understand the magnitude of the damages caused by MIC. Microorganisms can corrode and change a number of materials, including polymers, ceramic and glass in addition to metals. About
20 % of all corrosion effects are estimated to be caused by MIC, in certain industries the share is much higher. While well-known rust is caused by oxygen (aerobe), bacteria like SRB (sulfate reducing bacteria) are causing microbial corrosion without any oxygene (anaerobic).

The most famous example is the hull of ocean liner  Titanic, on which iron-eating bacteria were found. In addition, water pipes, storage tanks, gas tanks, oil pipelines and other parts of production installations can be affected by microbial corrosion. Better knowledge about the background and the effects of biocorrosion could prevent or reduce a major part of the damage: e.g. a more effective choice of suitable materials, their correct combination and the consideration of general framework conditions.

SisTec MIC Illu E

The triggers for MIC are the metabolic products of microorganisms, for example acid sulfur, hydrogen sulfide and nitric acid. Sulfate-reducing and acid-forming bacteria cause a big part of the problem. They cause very high local acid concentrations, which can also degrade high-alloyed substrates.

MIC affects almost any material: bacteria can inhibit all metals (except titanium, molybdenum and nickel cadmium),  plastics, glass, ceramics and any organic material. And they do not need much: Moisture, nutrients, microorganisms and any type of surface are sufficient. The main issue: bio corrosion caused by SRB (sulfatereducing bacteria) can destroy structures up to 10 times faster than “usual” corrosion caused by oxygen and water. Usually the parts in question are difficult or impossible to clean or repair, so that the perfect solution is a protective coating with highly efficient microsilver right from production.

Another important area of application is the protection of all sorts of water installation (tanks, cooling equipment, and water treatment). SISTec engineers have managed not only to protect the inside surfaces of tanks etc., but also to keep the water free from bacteria. Beyond the obvious hygienic advantage this is very important from a technical point of view: a high number of bacteria in any system is leading to bio mucus, which will block filters, valves, confuse sensors and so on, and can cause massive damages or high cost for cleaning and maintenance. MIC is causing billions worth of damages every year in repair costs, interruption of production and loss of value.

SISTec protective coatings based on microsilver are offering effective and permanent protection against all types of bacteria, also including sulfate-reducing bacteria – free from chemical and poisonous ingredients.