Electrochemical Study of MMA–VBC–MI Terpolymers as Corrosion Inhibitors in 1 M Acidic Environments

6 - Corrosion inhibitors for basic environments

Researchers have just discovered an alternative to synthetic corrosion inhibitors, which are hazardous and terrible for the ecosystem, to prevent rusting in the environment. A metal corrodes when it is subjected to corrosive media (acid, base, or saline) and they deteriorate, leading to failure. The most straightforward and affordable corrosion protection and prevention technique in acidic environments has been proven to be corrosion inhibitors. On industrial surfaces, pieces of machinery, or vessels, these inhibitors slow the rate of corrosion, preventing the monetary losses brought on by metallic corrosion. Recently, attention has been directed to developing ecologically appropriate corrosion retardation methods because inorganic and organic inhibitors are harmful and expensive. Recent studies have focused on green mild steel (MS) corrosion inhibitors that mimic industrial processes in acidic conditions. This presentation briefly covers the many types of corrosion, the corrosion process and the most recent studies on using natural plant extracts as corrosion inhibitors. Since they are safe and cost-effective, green corrosion inhibitors are a new trend in preventing corrosion. These inhibitors are produced from various plant parts, and inhibition efficiency (IE) also depends on them. To ascertain the IE of the corrosion inhibitor, some experiments, including computational studies (quantum calculations and MD simulations), electrochemical measurements (electrochemical impedance (EIS) and potentio-dynamic polarization), surface morphology atomic force microscopy (AFM), scanning electron microscopy (SEM)/energy-dispersive X-ray analysis (EDX) and UV–visible spectroscopy are carried out. It has been demonstrated that the IE is maximum for green corrosion inhibitors compared to synthetic inhibitors. This paper provides an overview of the properties, mechanism of corrosion inhibitors, nature of green corrosion inhibitors and their IE obtained by performing tests. This review article discussion shows that reinforcement with plant extract performs well in aggressive environments, which is evident from electrochemical studies and surface analysis when compared to reinforcement with inhibitors.

Mild steel is primarily used in reinforced concrete structures, because it has a low corrosion rate due to the formation of a passive oxide film in the alkaline environment. However, when exposed to acidic and atmospheric environments or aqueous environments containing dissolved salts such as sea water, the protective film deteriorates and corrosion occurs due to contamination caused by chloride and carbonation. It is possible to obtain corrosion inhibitors by extraction of bioactive compounds from plants. Thus, inexpensive and environmentally friendly new effective inhibitors are obtained as an alternative to environmentally harmful inhibitors. In this context, the subject of the study was determined as the investigation of the inhibition efficiency of the vanillin phenolic compound in the Çorum Oğuzlar walnut shell extract, which is a local product, on the corrosion of AISI 1010 mild steel in acidic, alkaline and salty environments. The walnut shells, which were cleaned, ground and pre-sieved with a certain grain size, were extracted in seven different solvents. In order to find the appropriate solvent, the total phenolic content (TPC) in the extracts was determined by both the Folin Ciocalteu method and the liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS) system. Cyclic voltammetry (CV) and Tafel polarization methods were applied to determine the effect of the extract on the electrochemical behavior of AISI 1010 and its corrosion rate. LC-MS/MS analysis showed the presence of compounds containing p electrons, N and O heteroatoms responsible for the corrosion inhibition. The best inhibition effectiveness was obtained with 86.1% acetone-water mixture in acidic environment (0.2 M HCl).

Exploring the potential of isonicotinohydrazide derivatives in N80 steel corrosion control: An integrated approach through synthesis, modeling, and experimentation in acidic environments

The corrosion of metals, i.e., the initiation and acceleration of the surface deterioration of metals through an electrochemical reaction with the surrounding intrusive environment, is a global concern because of the economic and environmental impacts. Corrosion inhibitors are considered the most practical choice among the available corrosion protection techniques due to their effectiveness in terms of functionality and cost. The use of traditional and toxic corrosion inhibitors has led to environmental issues, arousing the need for green counterparts that are environmentally friendly, easily accessible, biodegradable, and cost-effective. In this review, the utilization of green corrosion inhibitors purely acquired from renewable sources is explored, with an in-depth focus on the recent advancements in the use of fruit and vegetable extracts as green corrosion inhibitors. In particular, fruits and vegetables are natural sources of various phytochemicals that exhibit key potential in corrosion inhibition. To shed light on the true potential of such extracts in the protection of steel in acidic environments, the experimental techniques involved in corrosion inhibition and the mechanism of corrosion inhibition are discussed in detail. The study highlights the potential of fruit and vegetable extracts as non-toxic, economical, and effective corrosion inhibitors in the pursuit of green chemistry. In addition to discussing and outlining the current status and opportunities for employing fruit and vegetable extracts as corrosion inhibitors, the current review outlines the challenges involved in the utilization of such extracts in corrosion inhibition.

Layered double hydroxide (LDH) shows promising prospects in the application of intelligent coatings to prevent metals from corrosion, while it is not available under acidic conditions. This investigation aims to improve the corrosion resistance of LDH coating in an acidic environment. The surface morphology, structure, and composition of the LDH coating were characterized by scanning electron microscopy (SEM), X‐ray diffraction, Fourier transform infrared spectroscopy, and X‐ray photoelectron spectroscopy, respectively. The corresponding corrosion inhibition was evaluated by electrochemical methods, including electrochemical impedance spectroscopy and Tafel curves. The significant increase in coating resistance and charge transfer resistance and the obvious decrease in corrosion current density demonstrate the remarkable improvement of the MgAl–LDH coating in corrosion inhibition. The optical pictures and SEM images show that the coating is corroded severely when sodium dodecyl benzene sulfonate (SDBS) is not added, while it is protected competently without any signs of corrosion after polarization in HCl solutions containing SDBS, which enables the application of a MgAl–LDH coating under an HCl‐corrosive medium.

Study of okra pectin prepared by sweeping frequency ultrasound/freeze-thaw pretreatment on corrosion inhibition of ANSI 304 stainless steel in acidic environment

Herein, the corrosion inhibition performance of mild steel (MS) in an acidic environment (1.0 M HCl) by the valerian extract has been studied via weight loss method (WL), potentiodynamic polarization (PP), electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The results illustrated that the inhibition efficiency, raised by the rise of the extract concentrations. The inhibitory mechanism depended on the creation of a stable plant extract-complex on the mild steel surface. Polarization studies confirmed that the extract behaved as a mixed type inhibitor. The corrosion inhibition was supposed to exist via adsorption of the main components of the valerian extract. Attenuated total reflection-infrared spectroscopy (ATR-IR), scanning electron microscopy (SEM) and atomic force microscopy (AFM) were applied to investigate the change in the surface morphology and confirmed the corrosion inhibition mechanism. The complete study confirmed that the efficiency of the valerian extract as a safe, eco-friendly and exchange corrosion inhibition for mild steel in an acidic environment.

Acid corrosion is a problem pertaining to corrosion that involves an acid solution. It is important to treat metal to preserve its integrity. Thus, acids are utilized to clean and treat metal surfaces. In return, this may lead to over-etching and metal degradation. Corrosion inhibitors were introduced as a solution for the issue. However, there are some problems associated with the usage of conventional corrosion inhibitors. Traces of nitrites and chromates that are present in the inhibitors may lead to serious health and environmental issues. As a solution, organic green corrosion inhibitors have been studied to replace the conventional corrosion inhibitors. These inhibitor molecules form a protective layer on top of the metal surface to suppress metal dissolution when added to the acid solution. This process prevents direct contact between the metal surfaces and the acid environment. This study explores the usage of natural resources and biomass wastes as the basis for organic green corrosion inhibitors. This study also provides some suggestions for new biomass wastes that can be studied as new organic corrosion inhibitors, and it is aimed at opening the perspective of researchers on exploring new organic inhibitors by using natural resources and biomass wastes.

The current state of research in the field of inhibitor protection of metals and alloys in solutions of mineral and organic acids has been summarized and analysed. Acid solutions in modern industry are widely used at oil-and-gas facilities, metallurgy, housing-and-communal services, where they can be in contact with metal parts of industrial equipment for a long time, without the use of additional protection measures, causing its destruction. The specificity of the corrosive effect of acid solutions on metallic materials is analysed. Various groups of metal corrosion inhibitors (CIs) for these media and the features of the mechanism of their protective action were discussed. Among the various groups of CIs that protect metals in acidic media, various azole derivatives deserve the most attention. The industrial use of azoles is promising in the form of mixtures with other compounds. Promising lines of research in the field of inhibitory protection of metals in acidic media are associated with the wider application of the possibilities of electrochemical methods (voltammetry and electrochemical impedance spectroscopy). When determining the thermodynamic parameters of CIs adsorption, one should be guided by determining their true values, and not effective values. In the development of mixed CIs, a thorough theoretical study of these issues is required, taking into account prospects of such developments for the industrial use. Prospects for the industrial application of environmentally friendly («green») CIs for the protection of metals in acidic environments are considered. At present, the practical application of such products is limited by the lack of data on their compliance with the tight requirements of modern industries for CIs. The bibliography includes 129 references.

Natural and aromatic substances contained in plants which can be extracted by hydro-distillation or by cold extraction, more commonly known as essential oils are used today in several fields including cosmetic, perfumery, food processing, traditional medicine, agriculture etc. More recently, a strong use of these products extracted from plants as a corrosion inhibitor of metals and alloys in an acidic environment has been observed, given the number of works that have been published in recent decades. This review represents a general study on essential oils for a better understanding of these natural products, but also a non-exhaustive study of the published research works on the use of essential oils as a corrosion inhibitor of metals and alloys, in particular mild steels in acidic environments. Most of these studies have revealed great potentials of essential oils in inhibiting the corrosion of metals in aggressive environment, such as acidic environment. Thus, they have proposed alternatives to artificial metal corrosion inhibitor known to cause environmental pollution and public health issues. This review is a contribution to research efforts carried out by scientific community to find green corrosion inhibitors. It lays the basis for future research work aimed to investigate on the corrosion inhibition properties of essential oils extracted from Senegalese local plants.

Water hyacinth is a type of water weed that often cause problems. Its presence in large numbers in reservoirs may reduce the performance of hydroelectric power plants (PLTA) and can cause blockages in irrigation channels. Based upon several publications, water hyacinth leaves show good performance as corrosion inhibitor in the NaCl and hydrochloric acid environment. In this research the electrochemical method was used to investigate the feasibility of water hyacinth leaf extract as corrosion inhibitor for API 5L X-65 steel in NaCl, acetic acid, and CO2 environment. Furthermore, the addition of water hyacinth leaf extract concentrations with the most optimal efficiency was evaluated by the immersion method for 24, 72, and 120 hours. Evaluations of the specimen surface was also carried out using SEM. The effectiveness of the inhibition increases with the increasing of the extract concentration. The polarization test results indicate that water hyacinth leaf extract is classified as a mixed type inhibitor. The values of the capacitance and resistance parameters show an increase I the thickness of the double layer as the concentration increases. The effect of water hyacinth leaf extract inhibition as corrosion inhibitor can be seen from the phenomenon of water hyacinth leaf extract adsorption on the steel surface which can be approximated by using Langmuir isothermal adsorption model. The results of immersion testing show a decrease in the ability of water hyacinth leaf extract inhibition as the function of time. The SEM characterization results in a decrease of surface roughness of the specimen with the addition of water hyacinth leaf extract.

The widespread corrosion of critical oil and gas infrastructure requires development of innovative and environmentally sustainable solutions. This research considers the repurposing of hitherto un-useful expired drugs to meet this challenge and to do so in ways that also puts stop to the menacing and illegal circulation of expired pharmaceuticals in developing economies. The corrosion inhibitory potential of expired paracetamol was evaluated for mild steel in acidic environment. Electrochemical analysis revealed that the corrosion current decreased from for the mild steel immersed in the blank/uninhibited 0.5M HCl environment to in the case of the sample in the 8g/l environment. The concentration of dissolved ions of iron in the acidic environment also followed this trend supported by the results obtained from the gravimetric analysis. Optical microscopy showed gradual covering of the corroding surface by a layer of inhibitor film with increasing concentration of the additive in the acidic environment. The corrosion inhibition efficiency increased with increasing concentration of the expired drug, reaching a maximum of 73.24% for 8.0 mM of expired paracetamol directly dissolved in the acid. Expired paracetamol acted as a mixed-type inhibitor for mild steel in 0.5M HCl and the corrosion inhibition process was spontaneous. All analyses agreed that expired paracetamol drug is capable of inhibiting corrosion of mild steel in HCl and that the corrosion inhibition is achievable without prior pretreatment. The research is fundamental as it attempts to lay some groundwork for further research towards developing viable and marketable product from this category of materials.

Study about organic inhibitor has been performed to analyze effect of ginger extract concentration (Zingiber officinaler) to corrosion characteristic of API 5L grade steel under 3.5% NaCl and 0.1M HCl. Amount of 100 to 500 ppm inhibitor injected into each solution and electrochemistry tests were performed. Ginger extract has been prepared previously with maceration method and tested with FTIR to identify type compound in it. Tafel test result showed that corrosion rate of steel decreased in accordance with the increase of inhibitors concentration. Corrosion rate decreased to 12.13 mpy at 500 ppm inhibitor under NaCl solution, with efficiency 54.79%. While in HCl, corrosion rate showed similar trend, with corrosion rate 8.19 mpy at 500 ppm, with efficiency 81.66%. EIS result showed that impedance increased with the increase of inhibitors concentration, while FTIR result showed that ginger extract inhibitor contain 2-Methoxy-4-propylphenol which is known as antioxidant compound. According to XRD test, Fe2O3 and Fe3O4 compound were identified on steel surface. Ginger extract might worked better in acid environment since it decrease corrosion rate significantly compared to neutral solution.

corrosion refers to a chemical (dry corrosion) or electrochemical (wet corrosion) reaction of and the surrounding environment due to erosion of steel and its alloys or atmospheric gases causing substances used to break down or lose component atoms. Section Corrosion is also defined as an electrochemical process in which oxidation and reduction of metal occur simultaneously in the presence of an oxidizing agent such as oxygen. Section Dry corrosion and wet corrosion are two types. Oxidation of waste to form metal oxides; It is a good example of electrochemical dry corrosion, commonly known as rust. The loss of corrosion products often produces oxides or salts of the old metal. Corrosion cannot be prevented, but losses from corrosion can be minimized. Almost all materials, such as ceramics (concrete rusts) or polymers, corrode in one way or another, but in this case the word "degrades" is often used with . Section Corrosion is also defined as the loss of valuable properties. materials due to the attack of atmospheric gases. Surface corrosion of metals and their alloys due to atmospheric gases (wind and moisture), chemical or electrochemical reactions that cause corrosion (loss) of metals Atmospheric gases affect different metal alloys. Many processes alloys, moisture content, nature of disease, flow rate, etc. will corrode heavily, while others will corrode slightly. Corrosion rates can be greatly affected by exposure of to certain elements in the atmosphere. Corrosion occurs in many forms. Section Corrosion Similar to the diffusion control process as corrosion occurs in most materials and alloy . Main battery design is another cause of corrosion. The formation of primary cells in the body should be avoided as much as possible. Galvanic cells are created because when two dissimilar metals come into contact with each other, the formation of Section galvanic cells occurs, which causes galvanic corrosion. In galvanic cells, more reactive metals with hydrogen greater than in the EMF series will corrode at a high rate (anode), while noble metals with hydrogen less than in the EMF series will corrode at a slower rate (cathode). However, when they are separated, no galvanic cells are formed and each metal corrodes independently. The choice of metals and alloys used in industry prevents the Galvanic cell design from occurring, which can be done with the help of many galvanic cells. For example, zinc is often used as a sacrificial anode to protect steel and its alloys, to provide protection to steel structures. Galvanic Cell Corrosion Different factors affect the corrosion rate, such as the relative position of the anode, the type of metal , and physical conditions such as temperature, humidity, and salinity. The area between the anode and the cathode is also an important factor affecting the corrosion rate. Corrosion rate of records. Section Among the different factors affecting the corrosion rate, water in the air is the most important Section. Any metal electrode immersed in a standard ventilated environment such as steam Hot sea water in the house will be faster than the next Inert. . Chapter or more Chapter is being bullied as much as its position in the EMF series is different from When two dissimilar metals are in electrical contact with each other placed in the same electrolyte, and sharing the same electrons, there is competition between the two free electrons of the two materials. Item Electrolyte acts as a host for ions to flow in the same direction and eventually gains noble metal and takes electrons from active ions. The current generation can be scaled to increase or decrease data in the center of interest. There is a basic requirement that the metal be clean to reduce corrosion. Generally, corrosion products can be removed by chemical/physical means to obtain a clean surface , but one or another type of corrosion such as pitting corrosion may will not only result in significant savings, but will also help engineers keep plants and machinery running smoothly as Corrosion occurs. Carbon Steel, Stainless Steel, and Mild Steel are the most common materials used in the design and manufacture of the Chloride ions can corrode steel, stainless steel, and mild steel and are found in plumbing, electrical equipment, boilers, condensing units, etc. can cause problems. The sea is also abundant in chloride , which is used for injection into water in oil for cooling, such as in desalination plants. Chemical corrosion inhibitors are generally used in manufacturing and processing. The challenge, however, is to develop a new corrosion inhibitor that will protect material and make it a good friend in many situations. Surfactants are environmentally acceptable as corrosion inhibitors and is very economical and readily available. The purpose of this article is to determine the ability of surfactants to prevent corrosion of on carbon, stainless and mild steel surfaces. Chapter The various uses and properties of various surfactants are also discussed. The effect of surfactant concentration, temperature and corrosion inhibition mechanisms, and type of adsorption are also discussed in this book. In this study, we try to study in detail surfactants as corrosion inhibitors to control corrosion of carbon steel, stainless steel and small iron in acidic environment. Chapter Experiments were performed using both gravitational and electrochemical polarization methods, and the results of all studied surfactants used in this study are discussed in detail.