Abstract
The polyketide 5-methylmellein was isolated from Biscogniauxia sp. (Xylariaceae), an endophytic fungal strain obtained from an epiphytic bromeliad species collected in the Ecological Reserve at the Universidad Nacional Autónoma de México. This compound was investigated as a corrosion inhibitor for metallic materials, such as API 5L X65, in a corrosive 3% NaCl solution using electrochemical technique (electrochemical impedance spectroscopy). The results showed that 50 ppm of 5-methylmellein protected the metallic surface. Measurements at different rotation rates (500 and 1000 rpm) indicate that this compound decreases the charge transfer resistance (Rct) as a result of the desorption of organic molecules.
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