Abstract
The sea water leaching rate of cuprous oxide used as a toxicant in vinyl antifouling paints was studied in this work. Three paints were formulated: one of the soluble matrix type and the other two with an insoluble matrix. Two different toxicant levels were employed, and the paints were tested on a raft in Mar del Plata's Harbour, Argentina. Cuprous oxide lixiviation was studied over 15 months by determining weight changes and by means of microscopical examination (optical and SEM) of specially prepared cross-sections. A complementary analysis by EDAX electron dispersive analysis of the leached matrix and of the paint film/sea water interface was made. It was determined that the leaching line is parallel to the film surface. Experimental values demonstrated the different dissolution rates of paints with soluble and insoluble matrices and the lineal relationship existing between leaching rate and immersion time. Marson's formula for the determination of leaching rate at the laboratory (using the sodium glycinate method) was correlated with values obtained in sea water immersion, introducing a constant for each type of paint.
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