Abstract
Marine structures require particular concern to mitigate the massive destruction due to the activity attached biological fouling (biofouling). In the world, the utilization of antifouling (AF) paint is a mandatory method to remove or prevent the biological activity of marine organism from the surface of structures. As-received commercial antifouling (AF) paints (Paint A and Paint B) were utilized to evaluate their performance in Gulf of Benoa. Anticorrosion (AC) paint was also studied under as a reference. All specimens were placed at the submerged piles of Mandara Highway at time interval of 3, 7 and 12 months of exposure in different depth of the sea (0, 1,2 and 3 meters for sea level). The measurement of coastal water quality parameters comprising dissolved oxygen (DO), pH, water conductivity and water temperature were conducted during exposure. The assessment of AF paint properties consisting of adhesion strength, hardness, glossy and thickness also were undertaken. After exposure up to 12 months, it was seen that there was biofouling attached to the antifouling paint B, meanwhile sample coated by antifouling paint A remain clean. The results show that the thickness of antifouling paint B less than antifouling paint A, where those of both paints decrease gradually during exposure up to 12 months. SEM mapping after 12 months of exposure, there was no copper found in AF paint B that indicated all copper oxide from AF paint B has leached and causing biofouling attached to the surface of specimens. The performance of those paints depends on the thickness of antifouling paint to against biofouling attack. Their adhesive strengths decrease as well as their glossies after exposure of 12 months, but not their hardness.
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