Análise da corrosão em torres de sustentação de aerogeradores: causas e mitigação

Abstract

This paper aims to present some concepts related to wind turbines and, in particular, to understand the process of corrosion that occurs in the support towers. Wind energy is a market that, over the years, has been growing more and more worldwide, and Brazil has a considerable territory suitable for the use of wind energy. Understanding the operation of a wind turbine, its metal parts, its production process and ways to protect it against atmospheric corrosion is an important role for engineering. Thus, studying cases of corrosion in wind towers, knowing which steels are used in them, how the oxidation process arises, and what are the ways to protect such metals will be highlighted in this paper. Carbon steels such as A36 and S355 are the most common in these towers. With the high humidity and high chloride content found in coastal regions (common areas for wind farms), it is normal for various forms of corrosion to appear on these structures. The main form of protection for the support structures is using organic coatings (paints) for anti-corrosion protection. Specifically, epoxy-based bottom paint (in contact with the metal) and polyurethane (PU) finish paint are used in this type of application. In addition to providing corrosion protection, the PU finish ensures excellent stability to light.