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MAROFF-2-Maritim virksomhet og offsh-2

MarTERA MARINAL, Safe use of aluminium in marine multi-material constructions

Alternative title: MarTERA MARINAL, Trygg bruk av aluminium i marine multi-metall konstruksjoner

Awarded: NOK 5.7 mill.

The main goal of MARINAL is to increase the use of aluminium alloys (Al) in marine structures. An important obstacle to extended use of Al in marine applications is uncertainty about the corrosion properties. Marine and offshore design codes and standards focus on steel and do not provide the necessary information on how to use Al. Therefore, Al is often not even considered by engineers and designers. The focus of the project will therefore be basic studies of corrosion properties of standard Al alloys, including recycled alloys, in marine conditions and the development of innovative solutions for corrosion protection. Three specific technical challenges have been identified as crucial for increased use of Al in marine structures: ? Avoid galvanic corrosion in joints between Al and other materials, especially C-steel and stainless steel. ? Improved understanding of specific corrosion mechanisms: (1) corrosion during wet-dry cyclic exposure in marine atmosphere and splash zone, (2) microbially induced corrosion, and (3) temperature effects on seawater corrosion. ? Establishment of methods and parameters for corrosion protection of Al in marine structures, i.e. (1) cathodic protection in seawater and (2) pre-treatment and painting for exposure in the atmosphere and splash zone. In addition, we will evaluate the climatic and environmental consequences of increased use of Al in marine structures compared to other materials. The results from the project will be disseminated through scientific publications, seminars and workshops. Following the project, the results will be used to improve and write new standards, specifications and recommended practices for the use of Al in marine structures, providing marine engineers and designers with the necessary toolbox for the safe and efficient use of Al.

The main objective of MARINAL is to strengthen and extend the use of aluminium (Al) alloys in marine applications offering a throughout “green” solution. An important obstacle against extended use of Al in marine applications is uncertainty about the corrosion properties. Marine and offshore design codes and standards are focused on steel and do not provide the necessary information on how to use Al. Therefore, Al is not even considered by marine engineers and designers. The focus of the project will therefore be fundamental studies of corrosion properties of standard Al alloys, including recycled alloys, in marine conditions and development of innovative environmentally friendly protection solutions. Three specific technical challenges have been identified to be crucial for increased use of Al in marine constructions, and will receive attention in his project: • Avoiding galvanic corrosion in joint between Al and other materials, C-steel and stainless steel in particular. • Improved understanding of specific corrosion mechanism, i.e. (1) corrosion during wet-dry cyclic exposure in marine atmosphere and splash zone, (2) microbial induced corrosion, and (3) effect of temperature on corrosion in immersion conditions. • Establishing methods, processes and parameters for corrosion protection of Al in marine constructions, i.e. (1) cathodic protection when immersed in seawater and (2) blast cleaning and spray painting for exposure in atmosphere and splash zone. In addition, we will estimate the climatic and environmental impact of increased use of Al in marine constructions compared to other materials. Results from the project will be disseminated through scientific publications, seminars and workshops. After the project, the results will be used to improve and write new standards, specifications and recommended practices for using Al in marine constructions, providing marine engineers and designers with the necessary toolbox for safe and efficient use of Al.

Activity:

MAROFF-2-Maritim virksomhet og offsh-2