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Splash Zone Coating Performance after Long Term Offshore Exposure

Following the worlds growing need for sustainable energy solutions, offshore wind farms are important contributions to the generation of renewable energy. One key element for a profitable and sustainable operation of offshore wind farms is that the installations are protected with the most cost-effective corrosion protective solution for the entire lifetime. In practice, this means that today’s projects are planned with an estimated lifetime of a minimum of 25 years without major maintenance of the corrosion protective solution.

Product Number: 51323-19143-SG
Author: Anette Pedersen, Kari Lønvik, Erik Krogstad Sverre, Lars Lichtenstein, Anders W. B. Skilbred, Andreas Løken
Publication Date: 2023
$0.00
$20.00
$20.00

Several operators in the Oil&Gas industry have good experience with the use of glass flake reinforced polyester (GFP) coatings, however, limited information of documented long-term performance can be found in the open literature. During decommissioning of an aged Oil&Gas installation, a visual inspection was carried out at a decommissioning yard and a brace cut out from the splash zone of the jacket structure was examined in laboratory. The examination has included visual inspection, inspection in microscope, adhesion testing and EIS measurements. The durability and service life of GFP coating in offshore splash zone environment have in this work been documented to be good after 25-30 years exposure without any maintenance.


Based on experience from Oil&Gas industry, it may in future update of design codes for offshore wind foundation structures be considered to explicitly define a higher coating design useful life and a lower corrosion allowance in splash zone for GFP coated structures.

Several operators in the Oil&Gas industry have good experience with the use of glass flake reinforced polyester (GFP) coatings, however, limited information of documented long-term performance can be found in the open literature. During decommissioning of an aged Oil&Gas installation, a visual inspection was carried out at a decommissioning yard and a brace cut out from the splash zone of the jacket structure was examined in laboratory. The examination has included visual inspection, inspection in microscope, adhesion testing and EIS measurements. The durability and service life of GFP coating in offshore splash zone environment have in this work been documented to be good after 25-30 years exposure without any maintenance.


Based on experience from Oil&Gas industry, it may in future update of design codes for offshore wind foundation structures be considered to explicitly define a higher coating design useful life and a lower corrosion allowance in splash zone for GFP coated structures.

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Thermally Sprayed Coatings for Corrosion Protection of Offshore Structures Operating in Submerged and Splash Zone Conditions

Product Number: 51319-12808-SG
Author: Berenika Syrek - Gerstenkorn
Publication Date: 2019
$20.00

Corrosion protection of large structures such us wind turbines or offshore platforms operating in corrosive seawater environment is usually provided by cathodic protection (CP) and/or protective coatings. However those methods have some limitations. Organic coatings without CP can provide protection to steel substrate only when they remain intact whereas sacrificial anodes can considerably increase the overall mass of the protected structure and have to be replaced periodically. Moreover sacrificial anodes are only effective under submerged conditions and don’t protect the structure under alternating wetting and drying condition so-called “splash zone” which is particularly corrosive environment due to constant splashing of highly aerated seawater UV radiation and increased concentration of seawater constituents during drying. Furthermore confined volume of electrolyte easy access to oxygen and atmospheric pollutant deposited on the metals’ surface lead to more severe corrosion in this region than in the submerged zone.An alternative corrosion mitigation method is application of thermally sprayed metallic coatings such as thermally sprayed aluminium (TSA). TSA affords long-term and maintenance-free protection to steel substrate in two ways. Firstly when intact it acts as a barrier to the corrosive environment and secondly it provides sacrificial protection by working as an evenly distributed anode which preserves steel in case of a damage of a coating. Moreover large operating temperature range high resistance to mechanical damage and low corrosion rate in ocean water make it a perfect corrosion prevention method for offshore applications.One of the characteristic features of thermally sprayed coatings is porosity which is filled with corrosion products when the corrosion progresses. To delay the self-corrosion of the protective coating application of sealers is recommended.In this work the behaviour of several arc-sprayed metal coatings is investigated under full artificial seawater (ASTM D1141) immersion and compared with simulated splash zone conditions under droplets of artificial seawater. Effectiveness of TSA coatings is evaluated using electrochemical techniques and corrosion products are examined. The effect of novel sealers containing nanomaterials is also assessed.