Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
METHODOLOGY FOR MEASURE THE WEAR RESISTANCE OF ANTIFOULING PAINTS
Submission Author:
Vinícius Teles , GO
Co-Authors:
Luana Carmo , Karina Marques Maciel Silva, Philip Pritzelwitz, Vinícius Teles, Ana Letícia Pilz de Castro, Paulo Henrique Vieira Magalhães
Presenter: Vinícius Teles
doi://10.26678/ABCM.COBEM2021.COB2021-1741
Abstract
Anti-fouling paints, which are intended to prevent the growth of organisms, are applied on ship hulls and on many static structures that are submerged, including: gates, piers, aquaculture systems, pipelines and drilling platforms. Regardless of its mechanical properties, the coating must remain perfectly adhered to the substrate to act as a genuine protective layer against microorganisms. No studies have been found that evaluate the wear resistance of these coatings, especially the wear caused by the ship's contact on the side of the dock while docking. The goal of this work is to develop a methodology to evaluate the wear resistance of antifouling paints. In order to simulate the contact stress of the ship on the fenders, an apparatus was developed that consists of a 230 mm in diameter and 12.7 mm thick rubber-coated disc that rotates in contact with the specimen partially immersed in distilled water. The tangential velocity and contact pressure can be adjusted according to the movement and efforts developed by the ship during docking. Five commercial paints were evaluated. The paints were applied on marine carbon steel plates (ASTM 131) with dimensions of 200 x 250 x 3 mm, properly prepared and cleaned. Before the deposition of the antifouling coating, it was applied an anti-corrosion paint. The painting procedure strictly followed the manufacturer recommendation. Then, the specimens were cut to dimensions 76 x 25 x 3 mm. The normal load, applied by dead weight, was 120 N and the rotation of the disk was 25 rpm. The test time was 20 minutes. Five tests were performed for each paint. Penetration tests were also performed with Rockwell-C indenter and 150 kg load. The wear was measured by evaluating the area of paint removed. For that, an image analysis software was used. The results showed that the methodology was able to assess the wear resistance of the paint. It was possible to rank the five inks with respect to their wear resistance. The penetration tests showed that cracks or fissures could occur due to high localized stress in some paints. These failures are stress concentrators that can intensify wear and shorten the life of the coating. The developed methodology can help to select antifouling paints, predict the paint life and, reduce maintenance costs.
Keywords
Anti-fouling paints, Wear, Ships, Penetration tests
