Other protection methods
Inhibitors are often used in cooling systems, pipelines and as a component in rust-proofing coatings to reduce the rate of corrosion. Inhibitors often work by adsorbing themselves on the metallic surface, protecting the metallic surface by forming a film.
Considerable resources are now being invested in the development of new, environmentally friendly inhibitors, since many conventional inhibitors are environmentally hazardous.
Swerea has considerable knowledge of various types of inhibitors. We have developed a method which can be used to determine whether a system is inhibited or not and, e.g. determine the necessary inhibitor content, and maximum chloride content, to ensure that the system remains inhibited.
We also provide both practical and theoretical independent corrosion assessment of systems.
Contact: Annika Talus, annika.talus [at] swerea.se
Design of the structure
Structural design has a decisive impact on the service life of the structure.
Technical requirements for design of steel structures are given in SS-EN 1090-2:2008, and for aluminium structures in SS-EN 1090-3:2008. Factors that must be considered include: material thickness, risk of water entrapment, crevices, thermal bridges, and dissimilar metal combinations leading to galvanic corrosion.
Swerea has longstanding experience of assessing corrosion risks and estimating service life in the structural design phase.
Contact: Bertil Sandberg, bertil.sandberg [at] swerea.se
Change of the environment
Corrosion can be combated by changing the environment in which a product is to be used or stored. In an atmospheric environment (air) this is often done by reducing the humidity and amount of contaminants in the air. A reduction in sulphur dioxide concentration over the past 40 years has resulted in a dramatic reduction in corrosion rates in outdoor atmospheric environments.
Indoors, e.g. in industrial environments, air pollutants can be reduced via chemical filtration. A reduction in relative humidity can also inhibit corrosive attack: 60% relative humidity is often cited as the limit for steel, while 30% may be an appropriate limit for electronics. Relative humidity can be lowered by increasing the air temperature or with the aid of dehumidifiers. In sealed packaging, desiccants can be used.
Swerea can help you to assess your corrosion risks and suggest appropriate measures. We perform corrosivity measurements (vulnerability of different metals) and measure temperature, humidity and air pollutants as a basis for assessing corrosion risks.
Contact: Johan Tidblad, johan.tidblad [at] swerea.se