Corrosion Prevention of St37 Steel in Mediterranean Seawater Thanks to a Green Plant Extract: Gravimetric and Electrochemical Studies
Abstract
Metal corrosion is undoubtedly one of the most challenging problems facing by industry. The introduction of corrosion inhibitors is a sensible approach to protecting metal surfaces. An efficient and environmentally friendly method to mitigate corrosion is the use of corrosion inhibitors derived from natural products. In the present work, the inhibition efficiency of cardoon (Cynara cardunculus) leaf extracts (CC) on the corrosion of St37 steel in natural Mediterranean seawater was investigated. The corrosion inhibition percentage (IE%) of 30 ppm of (CC) extract, determined as a reference amount at temperatures of 298 and 328 K respectively, depending on the time (1, 7, 14, 21 and 28 days), was studied by weight loss and potentiodynamic polarisation (PDP) methods. The morphological changes on the metal surface were also analysed by SEM and EDS. It was observed that the percentage of corrosion protection of 30 ppm CC decreased from about 85% to 68% with increasing temperature. The time-dependent study also shows that even after one month at 298 K, it protects about 74% of the ST37 metal against corrosion in natural Mediterranean seawater.
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