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Marine corrosion

Sea water is an aggressive environment to many material and coatings which may lead to deterioration by corrosion or biofouling that causes deposition corrosion. RISE have broad expertise of materials applied in marine environments by using testbeds, have networks in marine corrosion and many experienced researchers.

Marine environment that is, sea water can be an aggressive environment for materials. Pure sea water in oceans has close to a constant composition and corrosivity for materials. The pH value lays around 8.1 and the salt content is about 3.5 % in weight, mainly NaCl. In seaports and other areas close to land, the composition of the seawater can be different. It depends on the outflow of watercourses or release of impurities. Seaport water often contains sulphur bases impurities which increases considerably the corrosivity.

These factors must be considered for materials and coatings exposed to marine environment to avoid and prevent corrosion. For corrosion laboratory testing it has been difficult to produce synthetic seawater, therefore testbeds are preferred. We have one at Brest Testbed for corrosion testing in natural sea water | RISE, which belongs to the French corrosion institute Institut de la corrosion – Institut de la corrosion (, subsidiary of RISE; where sea-water is directly pump from the sea into a laboratory. We have also one testbed at Kristineberg Testbed for materials in marine environment | RISE where samples are directly exposed in seawater. Furthermore, we have many years of expertise and knowledge for analysis, investigation and characterisation of surfaces, coatings and materials which have been exposed to marine environments.

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