Corrosion BIO-inhibitor containing scorpion venom

Abstract

The invention relates to a bio-inhibitor of animal origin, which is effective for iron in hydrochloric acid (HCI) medium and is different from other known conventional corrosion inhibitors.

Description

[0001] CORROSION BIO-INHIBITOR CONTAINING SCORPION VENOM

[0002] TECHNICAL FIELD

[0003] The invention relates to a bio-inhibitor of animal origin, which is effective for iron in hydrochloric acid (HCI) medium and is different from other known conventional corrosion inhibitors.

[0004] BACKGROUND

[0005] Corrosion is one of the most important problems that significantly affects industrial investment and production costs, as it is the event in which metallic materials interact with their environment and return to their primitive and stable state in nature. In fact, corrosion is an inevitable danger that threatens almost all engineering materials and is also considered one of the worst problems of our age, causing technical failures.

[0006] Considering both the cost and environmental impacts caused by corrosion in the engineering industry, the protection of metals and alloys in corrosive environments has actually led to the emergence of a number of useful efforts. These efforts aim to delay the possible corrosion process and to minimize the corrosion rate during this process. For this purpose, new and environmentally friendly biological inhibitors that inhibit or slow down the corrosion process are needed.

[0007] Various methods are used to struggle corrosion. Among these methods, corrosion inhibitors are among the most widely used. They stand out as one of the most practical methods due to their high efficiency and various application areas.

[0008] Protective bio-inhibitor substances generally increase the resistance of the metal / solution interface by covering the metal surface with a film layer. For this reason, mostly synthetic, organic / inorganic and plant-based biological inhibitors are used to eliminate the harmful effects of corrosion. However, due to the high cost of most synthetic organic compounds and their toxicity to living beings and the environment, their use is becoming increasingly limited. Recently, due to environmental regulations, plant extracts offer an alternative solution to the corrosion problem due to their advantages such as low toxicity and easy availability. AIM OF THE INVENTION

[0009] Environmentally friendly and natural bio-inhibitors in inhibiting corrosion, recently generally plant-based extracts are preferred as green inhibitors against the corrosion problem. Considering all these, one of the objectives of the invention is to use animal-based structures as corrosion bio-inhibitors as an alternative to plant-based ones, since they are environmentally friendly. Based on this objective, scorpion venom, an animal secretion, was used as a corrosion bio-inhibitor within the scope of the invention in inhibiting the corrosion of iron in hydrochloric acid environments. It was observed that scorpion venom was as effective as plant sources in inhibiting the corrosion of iron in 1.0 M HCI solution.

[0010] DETAILED DESCRIPTION OF THE INVENTION

[0011] The invention relates to the use of an animal-derived secretion, the venom of a scorpion species called Leiurus abdullahbayrami, as a bio-inhibitor in preventing metallic corrosion. In this context, the bio-inhibitor developed to be used in preventing corrosion, which is the subject of our patent application, contains scorpion venom.

[0012] In the state of the art, green inhibitors obtained synthetically or from plant extracts are widely preferred. However, in order to obtain the scorpion venom containing bio-inhibitor presented within the scope of our invention, Leiurus abdullahbayrami venom was provided from Nigde Omer Halisdemir University Arachnology Museum (NOHUAM). The venom obtained from the species Leiurus abdullahbayrami was taken as 0.1733 g. The stock solution concentration of this venom in water was calculated as 0.3466% (w / v) in terms of mass / volume. After determining the actual concentration of the stock venom aqueous solution, the ideal concentration range was determined from this solution by the dilution method in order to determine the effect of concentration on corrosion. The determined concentration range is 0.020% (w / v) - 0.160% (w / v).

[0013] 1 .0 M HCI solution was used as electrolyte medium at each concentration to perform electrochemical experiments. Iron was selected as the working electrode. The mass percentage composition of the iron whose corrosion effect is investigated (% w): 0.06030% Cr; 0.00222% Nb; 0.07890% Ni; 0.01100% V, 0.01100% P; 0.01040% Mo; 0.08400% C; 0.21700% Cu; 0.40900% Mn; 0.01900% S; 0.01620% Sn; 0.00198% Co; 0.10200% Si and 98.977% Fe. Corrosion measurements were carried out using the conventional three-electrode technique (Fe with a surface area of 0.5024 cm2as the working electrode, Ag / AgCI as the reference electrode, and Pt plate with a surface area of 2 cm2as the counter electrode) on a CHI-660B electrochemical analyser.

[0014] The experimental results of the bio-inhibitor, which is the subject of the invention, were evaluated by three different methods (EIS, LPR and Tafel extrapolation) after one hour of immersion of the working electrodes in the electrolyte solution. As a result of electrochemical methods, it was determined that the venom of the scorpion Leiurus abdullahbayrami species inhibited the corrosion of the iron electrode in acidic medium after one hour of immersion; with the EIS method, it exhibited 78.5% inhibition at the lowest concentration of 0.020% (w / v) and 84.5% inhibition at the highest concentration of 0.160% (w / v); with the LPR method, it exhibited 79.8% inhibition at the lowest concentration of 0.020% (w / v) and 83.7% inhibition at the highest concentration of 0.160% (w / v); and with the Tafel extrapolation method, it exhibited 76.6% inhibition at the lowest concentration of 0.020% (w / v) and 84.5% inhibition at the highest concentration of 0.160% (w / v). It was concluded that the inhibition efficiencies obtained by all three electrochemical methods were quite consistent with each other.

[0015] In the corrosion process occurring at the iron / electrolyte solution interface, the formation of a film layer on the iron surface by low molecular weight peptides present in the venom of the Leiurus abdullahbayrami species plays an effective role in the high inhibition of approximately 85% after one hour of immersion of this new bio-inhibitor, which is used for the first time in inhibiting corrosion. Although the venom of the Leiurus abdullahbayrami species was used in the above-mentioned process, the venom of any species of scorpion can also be used within the scope of the invention.

[0016] The art effect of the invention is the use of scorpion venom as a bio-inhibitor. In this context, within the scope of the invention, a corrosion inhibiting composition contains scorpion venom as an active component. The bio-inhibitor, which is the subject of the invention, is applied by cleaning and polishing the surface and then immersing it in an electrolyte solution with a corrosion inhibitor containing scorpion venom to interact with the iron surface in order to protect the iron surface against corrosion. In other words, scorpion venom is used as an inhibitor to prevent corrosion of metal surfaces.

Claims

CLAIMS1 . An anti-corrosion composition characterized by comprising scorpion venom as the active component of this composition.

2. A method that provides protection of an iron surface against corrosion characterized by comprising the steps of cleaning the iron surface and applying a corrosion inhibitor further comprising scorpion venom to the iron surface.

3. The application process to the iron surface according to claim 2 characterized by immersing the corrosion inhibitor comprising scorpion venom and the iron surface into the electrolyte solution and interacting the inhibitor with the metal surface.

4. Use of scorpion venom as an inhibitive substance to corrosion of ferrous metal surfaces.