Corrosion inhibition efficiency of eight heterocycles at 10 mM.
Abstract
Metal corrosion constitutes degradation of metals in the presence of favorable corrosive atmosphere. It worsens metal quality. The prevention of metal corrosion is so significant to save metals for their better utility. Corrosion inhibitors are widely used for the mitigation of metal corrosion. Small organic molecules as corrosion inhibitors are showed prominent corrosion inhibitive property because of their unique electron donating capacity to the metal orbitals. The bonding occurred between organic molecules and metals are main aspect to retard the corrosive environment toward metal.
Keywords
- metal
- corrosion
- organic molecule
- inhibitor and prevention
1. Introduction
Corrosion is the naturally happening process which transfers metals into their stable form. Metals easily facilitated to the corrosion in the presence of corrosive media (acidic, basic, and brine). In other words, it is the gradual deterioration of metals in the existence of favorable reactive environment. Nowdays, corrosion of metal became global problem as it worsened the quality of metals and directly or indirectly affect economy of any country. The control of corrosion metals using appropriate methodology is so important. Application of corrosion inhibitor for the prevention of corrosion found prominent attention. The suitable concentration of corrosion inhibitor reduced the corrosion rate without altering the concentration of corrosive media [1]. For the control of metal corrosion, various kinds of inhibitors including inorganic compounds, plant extract, and organic molecules are commenced for the mitigation of metal corrosion as illustrated in Figure 1 [2]. Small organic inhibitors are widely applied for the control of metal corrosion as they are easy to prepare compared to complex organic molecules [3]. The best example of small organic molecule as corrosion inhibitor is a BTA [4]. BTA effectively mitigated metal corrosion. The presence of unique functionality in the small organic compounds is strongly react with metal by chemical or physical bonding and preserved metal against harsh corrosive media. Corrosion inhibitors interact with metal at metal/solution interface by forming film on the metal surface and hindered corrosion reaction. The formed protective film limits corrosive media, oxygen, and water diffusion toward metal surface, so reducing corrosion rate. Any type of corrosion inhibitors can be categorized into cathodic, anodic, or mixed type which depending on their influence in the suppressing cathodic/anodic reaction or both [5]. This chapter includes the application of small organic molecule for the prevention of corrosion of various metals in different corrosive media. This chapter includes the application of small organic molecule for the prevention of corrosion of various metals in different corrosive media.
2. Application of small organic molecule as corrosion inhibitors
Corrosion inhibition activity of small organic molecules such as imidazole (IM), 2-ethylimidazole (EI), thiophene (TH), 2-ethylthiophene (ET), 3-methoxythiophene (MT), pyridine (PY), 4-ethylpyridine (EP), and 4-methoxypyridine (MP) have been assessed for the mild steel (MS) in 1 M HCl [6]. The corrosion inhibition property of inhibitors has been determined by the potentiodynamic polarization (PDP), linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) methods. The parameters such as a decrease in the corrosion current density (Icorr) values and an increase in the polarization resistance (Rp) revealed corrosion inhibition action of inhibitors. The corrosion inhibition efficiency increased with enhancing of the concentration of inhibitors. The inhibitor EP showed highest corrosion inhibition efficiency. The EP displayed 85.9%, 76.9%, and 88.7% corrosion inhibition efficiency as determined by PDP, LPR, and EIS. The PDP method indicated that corrosion inhibitors behaved as mixed type of inhibitors (control on the anodic and cathodic reaction). The corrosion inhibition efficiency of all eight compounds is displayed in Table 1.
Sr. No. | Corrosion inhibitor | Corrosion inhibition efficiency | ||
---|---|---|---|---|
PDP | LPR | EIS | ||
1 | Imidazole (IM) | 70.4% | 78% | 80.1% |
2 | 2-ethylimidazole (EI) | 74.3% | 81.1% | 84.3% |
3 | Thiophene (TH) | 59.9% | 63.7% | 64.2% |
4 | 2-ethylthiophene (ET) | 22.3% | 52% | 53.4% |
5 | 3-methoxythiophene (MT) | 58.1% | 82.6% | 82.8% |
6 | Pyridine (PY) | 74.4% | 82.9% | 67.6% |
7 | 4-ethylpyridine (EP) | 76.9% | 88.7% | 85.9% |
8 | 4-methoxypyridine (MP) | 56% | 67.5% | 71.5% |
The organic compounds (Z) -4 - ((2-bromobenzylidene) amino) -5-methyl-2-4-dihydro -3H-1,2,4-triazole-3-thione (
3. Conclusion and future prospective
Corrosion of metal is the ambitious problem. The corrosion of metal can be controlled by using appropriate method. Corrosion inhibitors somewhat mitigated the metal corrosion. Small organic molecules played a significant role as corrosion inhibitors. The benefit to utilize small organic molecules is that they are easy to prepare (no multiple steps are involved) and exhibited good corrosion activity similar to complex molecules. There are numerous small molecules available The future direction in this filed is to apply small organic molecules which are most economical, less hazardous, and readily available from the natural sources and can show good anticorrosive property as well.
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