The natural product Catharanthus roseus and Lawsonia inermis leaf extract enhancement in the anti-corrosion potential green corrosion inhibitor (GIC) for Bacillus oleronius EN9 biofilm forms on mild steel (MS) in re-circulating water environment is demonstrated. This re-circulating water was enhancing the corrosion due to the temperature, pH, salinity, and chloride. Therefore, we need to improve the performance of the inhibitors. The chosen GIC inhibition was examined by antibacterial assay, weight loss, surface, and electrochemical analysis. L. inermis has shown the antibacterial activity (75%) against the corrosive bacteria Bacillus oleronius than the C. roseus (44%) optimum concentration of 20 ppm. L. inermis was selected for further studies and it reduces the corrosion rate up to 75 % in the 1% NaCl system. Scanning electron microscopy confirms the formation of the protective film on MS and GC–MS confirmed the presence of complex molecules of L. inermis. Therefore, the current work concluded that green corrosion inhibitor is suitable for the inhibition of biocorrosion of MS in the re-circulating system and a promising alternative for chemical inhibitor.

证明了天然产物长春花和无头无花果叶提取物在循环水环境中低碳钢 (MS) 上形成的油性芽孢杆菌EN9 生物膜的抗腐蚀潜力绿色腐蚀抑制剂 (GIC) 中的增强作用。由于温度、pH 值、盐度和氯化物，这种再循环水增强了腐蚀。因此，我们需要提高抑制剂的性能。通过抗菌测定、重量损失、表面和电化学分析来检查所选的 GIC 抑制。L. inermis对腐蚀性细菌Bacillus oleronius的抗菌活性 (75%)超过C. roseus(44%) 最佳浓度为 20 ppm。L. inermis被选中进行进一步研究，它在 1% NaCl 系统中将腐蚀率降低了 75%。扫描电子显微镜证实了 MS 上保护膜的形成，而 GC-MS 证实了L. inermis复杂分子的存在。因此，目前的工作得出结论，绿色缓蚀剂适用于抑制再循环系统中MS的生物腐蚀，是一种有前景的化学缓蚀剂替代品。