Abstract
The parsley extract (PLE) was prepared using absolute ethyl alcohol. The PLE and synergistic iodide were firstly utilized as efficacious corrosion inhibitors to slow down the corrosion rate of carbon steel-Q235 in 0.5 mol/L H2SO4 solution. The anti-corrosion performance was researched by weight loss method, electrochemical tests, surface analysis and quantum chemistry calculation. Results of electrochemical and weight loss tests show that the synergetic PLE and I− exhibit the optimal corrosion inhibition efficiency 99%. The combined inhibitor displays the favorable long-term corrosion inhibition effect, and the inhibition efficiency can maintain more than 90% after 144 h immersion. The introduction of I− makes carbon steel surface with higher negative charge amount, which could be beneficial to the interaction between corrosion inhibitor and Fe atoms. The adsorption behavior obeys the Langmuir isotherm adsorption, and involves chemical and physical adsorption. On the basis of electrochemical consequences and theoretical calculation, the adsorption process and anti-corrosion mechanisms are further explored.
Highlights
Corrosion is an inevitable natural issue for most metals according to the laws of thermodynamics, namely conversion from pure metal to their more stable thermodynamic form
An obvious peak appears at 299 nm in the UV spectrum in Figure 1B, which corresponds to n-π* transitions (Corrales Luna et al, 2019) of the flavonoid unit in the parsley extract (PLE) structure
PLE was prepared through an alcohol extraction method, and used as an effective corrosion inhibitor with I− for enhancing anti-corrosion performance of carbon steel-Q235 in 0.5 mol/L H2SO4 solution
Summary
Corrosion is an inevitable natural issue for most metals according to the laws of thermodynamics, namely conversion from pure metal to their more stable thermodynamic form. As for metals used in equipment and buildings, corrosion will bring huge damage to the material service performance. Considering the threat caused by corrosion with economic, material conservation and safety impacts in various engineering applications, the public have developed several proper corrosion prevention methods, including coating, corrosion inhibitor, sacrificial anode, corrosionresistance alloys, etc. (Nazeer and Madkour, 2018; Wan et al, 2021a; Kang et al, 2021; Salleh et al, 2021; Xu et al, 2021; Cao et al, 2022). Metals are defenceless to corrosion in the presence of acid, which can attack and dissolve metal into ions.
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