Carbon steel coupons are used to characterize inhibition efficiency and surface properties for different Ficus racemosa leaf extract (FRLE) concentrations including 0, 500, 1000, 1500 and 2000 ppm in an aerated 0.1 M hydrochloric acid solution. The results indicate that carbon steel is significantly protected by FRLE and higher performances are reached with an increase in FRLE concentration up to 1500 ppm (93.11 ± 1.99%). Additionally, the addition of 2000 ppm FRLE reduced inhibition performance (88.86 ± 2.15%) due to high inhibition concentrations that could impede the formation of a solid protective film. This also demonstrates that the corrosion of steel is probably retarded via the formation of a protective film which is reinforced by FRLE concentration and exposure time due to the continuous adsorption of FRLE inhibitor components at suitable concentrations. The quantum chemical calculations demonstrate a high binding energy between FRLE molecules and carbon steel and a good thermal stability of the adsorbent layer, as well as an electron abundance of the FRLE species. This could result in a much more compact solid protective layer that could hinder electrochemical corrosion when carbon steel is exposed in an aerated 0.1 M hydrochloric acid solution.

碳钢试样用于表征不同浓度的榕榕叶片提取物（FRLE）在0.1 M充气盐酸溶液中的浓度为0、500、1000、1500和2000 ppm时的抑制效率和表面特性。结果表明，碳纤维受到FRLE的显着保护，并且FRLE浓度增加到1500 ppm（93.11±1.99％）时，可以达到更高的性能。另外，由于高抑制浓度会阻碍固体保护膜的形成，因此添加2000 ppm FRLE会降低抑制性能（88.86±2.15％）。这也表明钢的腐蚀很可能通过形成保护膜而得以缓和，该保护膜由于FRLE抑制剂组分在适当浓度下的连续吸附而被FRLE浓度和暴露时间所加强。量子化学计算表明，FRLE分子与碳钢之间的结合能高，吸附层具有良好的热稳定性，并且FRLE物种的电子丰度高。当将碳钢暴露在充气的0.1 M盐酸溶液中时，这可能会导致紧凑得多的固体保护层，从而阻止电化学腐蚀。以及FRLE物种的电子丰度。当将碳钢暴露在充气的0.1 M盐酸溶液中时，这可能会导致紧凑得多的固体保护层，从而阻止电化学腐蚀。以及FRLE物种的电子丰度。当将碳钢暴露在充气的0.1 M盐酸溶液中时，这可能会导致紧凑得多的固体保护层，从而阻止电化学腐蚀。