POTENTIAL OF CABBAGE EXTRACT (Brassica oleracea) AS ANTI-FOULING AGENT IN ALKYD UNDERCOAT FOR MILD STEEL IN SEAWATER

An investigation was conducted on cabbage extract (Brassica oleracea) to observe its function as green antifouling agent in alkyd undercoat for mild steel in seawater. Cabbage extract shows 43.6% of inhibition efficiency towards Pseudomonas aeruginosa bacteria at 15.525 g/mL cabbage concentration. FTIR analysis shows the complexation between alkyd paint and cabbage extract where the peak in OH, C-H and C=O have shifted indicating the chain scission of the alkyd resin polymer backbone with cabbage extract. Weight gained analysis reveals that coated mild steel incorporated with cabbage extract had reduced the fouling attachment. However, weight gained value increases as the immersion period increases for all coated samples. Morphological profile of coated mild steel shows an attachment of fouling where prominent attachment can be observed on coated mild steel without cabbage extract.