Fifteen percent hydrochloric acid (HCl) solutions are used for some cleaning processes in the petroleum industry. The use of such a corrosive medium is mainly responsible for the corrosion of the stainless steel (SS-410) vessels and pipings. In this study, the corrosion inhibiting properties of Oryza sativa plant extract (OSPE) from agricultural residues are investigated on SS-410 steel surfaces in a 15% HCl medium. Gravimetric analysis showed a maximum corrosion inhibition of 91.92% with 4 g/L OSPE in 15% HCl solution. Scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray diffraction studies confirmed the adsorption of OSPE on the SS-410 surface. The adsorption of OSPE on SS-410 followed the Langmuir adsorption isotherm, indicating the formation of a monolayer on the SS-410 surface. The theoretical study confirmed that the anticorrosive effect could be mainly related to the phytochemical 9,12,15-octadecatrienoic acid 2,3-dihydroxypropyl ester. Consequently, the OSPE containing this phytochemical shows an anticorrosive behavior on the SS-410 surface in an acidic 15% HCl solution.

中文翻译：

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15% 盐酸中的稻植物提取物作为不锈钢 410 表面的绿色缓蚀剂

15% 的盐酸 (HCl) 溶液用于石油工业中的某些清洁过程。使用这种腐蚀性介质主要是造成不锈钢（SS-410）容器和管道的腐蚀。在这项研究中，在 15% HCl 介质中，研究了 SS-410 钢表面从农业残留物中提取的水稻植物提取物 (OSPE) 的腐蚀抑制特性。重量分析表明，4 g/L OSPE 在 15% HCl 溶液中的最大缓蚀率为 91.92%。扫描电子显微镜 (SEM)、原子力显微镜 (AFM) 和 X 射线衍射研究证实了 OSPE 在 SS-410 表面上的吸附。OSPE 在 SS-410 上的吸附遵循 Langmuir 吸附等温线，表明在 SS-410 表面形成了单分子层。理论研究证实，防腐效果主要与植物化学成分9,12,15-十八碳三烯酸2,3-二羟丙酯有关。因此，含有这种植物化学物质的 OSPE 在 15% 的 HCl 酸性溶液中对 SS-410 表面表现出抗腐蚀行为。