Ficus racemosa leaf extract for inhibiting steel corrosion in a hydrochloric acid medium

Alexandria Engineering Journal

L.T. Huyen¹  N.D. Nam¹  Q.T. Trinh²  N.Q. Tran³  S.V. Prabhakar Vattikuti⁴  N.S.H. Vu⁴  L.X. Bach⁵  H.T. Thu⁶  H.T. Anh⁶ 

[1] Devices Lab., Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City 700000, Viet Nam;Graduate School of Science and Technology Viet Nam, Vietnam Academy of Science and Technology, 1A TL29, District 12, Ho Chi Minh City 700000, Viet Nam;The Faculty of Environmental and Chemical Engineering, Duy Tan University, Da Nang 550000, Viet Nam;;Future Materials &Institute of Applied Materials Science, Vietnam Academy of Science and Technology, 1A TL29, District 12, Ho Chi Minh City 700000, Viet Nam;Thu Dau Mot University, 6 Tran Van On Street, Phu Hoa Ward, Thu Dau Mot City, Binh Duong Province 820000, Viet Nam;

关键词: Carbon steel;    Ficus racemosa;    Acid corrosion inhibition;    Electrochemistry;    Surface analysis;    Quantum chemical calculations;   

DOI  :  

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown