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Use of Silica Tubes as Nanocontainers for Corrosion Inhibitor Storage  [PDF]
Cesia ávila-Gonzalez,Rodolfo Cruz-Silva,Carmina Menchaca,Selene Sepulveda-Guzman,Jorge Uruchurtu
Journal of Nanotechnology , 2011, DOI: 10.1155/2011/461313
Abstract: A new alkyd paint anticorrosion smart coating was developed by using silica nanoparticles as corrosion inhibitor nanocontainers. Silica particles were mixed with the paint at different concentrations to study their performance and ensure their free transportation to the damaged metal. The filling up of silica particles was done preparing three solutions: distilled water, acetone, and a mixture of both, with Fe(NO3)3 and silica particles immersed in each of the solutions to adsorb the inhibitor. Acetone solution was the best alternative determined by weight gain analysis made with the inhibitor adsorbed in silica nanocontainers. Steel samples were painted with inhibitor silica nanocontainer coatings and immersed in an aqueous solution of 3% sodium chloride. Polarization curves and electrochemical noise techniques were used to evaluate the corrosion inhibitor system behavior. Good performance was obtained in comparison with samples without inhibitor nanocontainer coating. 1. Introduction Every corrosive protection action effort may be lost or become more costly if the mechanisms are effective but not efficient and/or applied in an area ill prepared or under nonideal conditions. So it is necessary to develop new avant garde design schemes to achieve effective protection. Currently, smart coating applied in nanotechnology promise solutions to this problem and benefits everything from new applications, existing structures under more efficient solution. Storage of the inhibitor is based on the use of particles, which can play the role of nanocontainers for corrosion inhibitors adsorbed inside [1–3]. A new generation of anticorrosion coatings that respond to changes in the environment has sparked great interest because corrosion is one of the most important causes of destruction of structures that involve the loss of material, and prevention is paramount. This type of protection is intended to retard corrosion of the metal substrate and/or control it. In this paper, a smart system for corrosion protection was developed based on the synthesis of silica (SiO2) nanotubes and the storage and containment of ferric nitrate (Fe(NO3)3) as an oxidant corrosion inhibitor, mixed in a polymer coating to achieve a “smart inhibitor coating” performance. The coating releases the active ions, which act as a local trigger mechanism inhibiting or passivating the active metal surface, when it is required. The direct introduction of components of the protective coating inhibitor often leads to the deactivation of the corrosion inhibitor and polymer matrix degradation. To overcome
Functional Acrylic Polymer as Corrosion Inhibitor of Carbon Steel in Autoclaved Air-Foamed Sodium Silicate-Activated Calcium Aluminate/Class F Fly Ash Cement  [PDF]
Toshifumi Sugama, Tatiana Pyatina
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.511109
Abstract:

The study focused on investigating the effectiveness of functional acrylic polymer (AP) in improving the ability of airfoamed sodium silicate-activated calcium aluminate/Class F fly ash cement (slurry density of 1.3 g/cm3) to mitigate the corrosion of carbon steel (CS) after exposure to hydrothermal environment at 200?C or 300?C. Hydrothermally-initiated interactions between the AP and cement generated the formation of Ca-, Al-, or Na-complexed carboxylate derivatives that improved the AP’s hydrothermal stability. A porous microstructure comprising numerous defect-free, evenly distributed, discrete voids formed in the presence of this hydrothermally stable AP, resulting in the increase in compresive strength of cement. The foamed cement with advanced properties conferred by AP greatly protected the CS against brine-caused corrosion. Four major factors governed this protection by AP-incorporated foamed cements: 1) Reducing the extents of infiltration and transportation of corrosive electrolytes through the cement layer deposited on the underlying CS surface; 2) Inhibiting the cathodic reactions at the corrosion site of CS; 3) Extending the coverage of CS by the cement; and 4) Improving the adherence of the cement to CS surface.

UAE Neem Extract as a Corrosion Inhibitor for Carbon Steel in HCl Solution  [PDF]
Ayssar Nahlé,Ideisan Abu-Abdoun,Ibrahim Abdel-Rahman,Maysoon Al-Khayat
International Journal of Corrosion , 2010, DOI: 10.1155/2010/460154
Abstract: The effect of aqueous extract of UAE Neem (Azadirachta Indica) on the corrosion inhibition of carbon steel in 1.0?M HCl solution was investigated electrochemically, and by weight-loss experiments at temperatures ranging from 303 to 343?K. The percentage inhibition increased with the increase of the concentration of the inhibitor. At a concentration of 2.0?g/L, the percentage inhibition reached about 87% at room temperature and 80% at 303?K. The percentage inhibition decreased with the increase of temperature. The thermodynamic parameters for the adsorption of this inhibitor on the metal surface were calculated using the Temkin adsorption isotherm. The aqueous Neem leaves extract was found to be an excellent potential corrosion inhibitor because of the high content of tannin content as well as the presence of a series of complex triterpene glycosides. 1. Introduction The corrosion of metals in many industries, constructions, installations, and civil services such as electricity, water, and sewage supplies is a serious problem. In order to prevent or minimize corrosion, inhibitors are usually used especially in flow cooling systems. Organic, inorganic, or a mixture of both inhibitors can inhibit corrosion by either chemisorption on the metal surface or reacting with metal ions and forming a barrier-type precipitate on its surface [1]. Because of the toxic nature and/or high cost of some chemicals currently in use as inhibitors, it is necessary to develop environmentally acceptable and inexpensive ones. Natural products can be considered as a good source for this purpose. The aqueous extracts from different parts of some plants such as Henna, Lawsonia inermis [1], Rosmarinous officinalis L. [2], Carica papaya [3], cordia latifolia and curcumin [4], date palm, phoenix dactylifera, henna, lawsonia inermis, corn, Zea mays [5], and Nypa Fruticans Wurmb [6] have been found to be good corrosion inhibitors for many metals and alloys. Recently, an excellent review about “natural products as corrosion inhibitors for metals in corrosive media” has been published [7]. No studies have been reported on the aqueous extract of Neem leaves planted in UAE, Azadirachta indica, as corrosion inhibitor used in our present work, in terms of studying both the electrochemical effect and the temperature effect on the corrosion inhibition of carbon steel in 1.0?M HCl solution. Carbon steel was chosen in our studies since high temperature aggressive acids are widely used in industries in connection to carbon and low alloy steels. The aim of this work is to study, using
Oil Soluble Corrosion Inhibitor on Microbiologically Influenced Corrosion in Diesel Transporting Pipeline
Muthukumar,N.; Maruthamuthu,S.; Mohanan,S.; Palaniswamy,N.;
Portugaliae Electrochimica Acta , 2007,
Abstract: the effect of oil soluble commercial corrosion inhibitors (osci) on the growth of bacteria and its corrosion inhibition efficiency were investigated. corrosion inhibition efficiency was studied by rotating cage test and the nature of biodegradation of corrosion inhibitor was also analyzed by using ftir, nmr and gc-ms. this isolate has the capacity to degrade the aromatic and aliphatic hydrocarbon present in the corrosion inhibitors. the degraded products of corrosion inhibitors and bacterial activity determine the electrochemical behaviour of api 5lx steel. the influence of bacterial activity on degradation of corrosion inhibitor and its influence on corrosion of api 5lx have been evaluated by employing weight loss techniques and electrochemical studies. the present study also emphasizes the importance of evaluation of oil soluble corrosion inhibitor in stagnant model (flow loop test) and discusses the demerits of the oil soluble corrosion inhibitors in petroleum product pipeline.
Oil Soluble Corrosion Inhibitor on Microbiologically Influenced Corrosion in Diesel Transporting Pipeline
N. Muthukumar,S. Maruthamuthu,S. Mohanan,N. Palaniswamy
Portugaliae Electrochimica Acta , 2007,
Abstract: The effect of oil soluble commercial corrosion inhibitors (OSCI) on the growth of bacteria and its corrosion inhibition efficiency were investigated. Corrosion inhibition efficiency was studied by rotating cage test and the nature of biodegradation of corrosion inhibitor was also analyzed by using FTIR, NMR and GC-MS. This isolate has the capacity to degrade the aromatic and aliphatic hydrocarbon present in the corrosion inhibitors. The degraded products of corrosion inhibitors and bacterial activity determine the electrochemical behaviour of API 5LX steel. The influence of bacterial activity on degradation of corrosion inhibitor and its influence on corrosion of API 5LX have been evaluated by employing weight loss techniques and electrochemical studies. The present study also emphasizes the importance of evaluation of oil soluble corrosion inhibitor in stagnant model (flow loop test) and discusses the demerits of the oil soluble corrosion inhibitors in petroleum product pipeline.
Solanum surrattence as Potential Corrosion Inhibitor  [PDF]
Manish Kumar Sharma,Anil Kumar Sharma,S. P. Mathur
ISRN Corrosion , 2012, DOI: 10.5402/2012/907676
Abstract: Developping chip and ecofriendlly corrosion inhibitors can replace toxic chemicals which are currently used in industries. Plant extract of Solanum surrattence in acetone, petroleum ether, and methanol has been tasted using mass loss and thermometric measurements for corrosion of aluminium in acid solutions. The plant extract of Solanum surrattence is a good corrosion inhibitor for aluminium. The inhibition efficiency depends upon the concentration of inhibitors, it inhibits the metal of 97.60% at its maximum value. This inhibitor shows efficiency at 25°C. At higher temperature the inhibition efficiency decreases. These types of inhibitors can be used to replace the toxic chemicals which are currently used in industries. We find out cheap and ecofriendlly corrosion inhibitors which can be used by acid, petrochemical, and chemical industries. 1. Introduction Aluminium and its alloys lend themselves to many engineering applications because of their combination of lightness with strength, their thermal and electrical conductivities, heat and light reflectivity, and their hygienic and nontoxic qualities. Aluminium and its alloy are exposed to the action of acids in industries; processes in which acid plays a very important role are acid pickling, industrial acid cleaning, cleaning of oil refinery equipment, oil well acidizing, and acid descaling. The corrosion of aluminium and its alloy in acid solutions have extensively been studied [1]. Some chemicals as corrosion inhibitors are currently using in industries to prevent or to reduce the corrosion rates of metals in these acid media. Due to toxic nature and high cost of these chemicals it is necessary to develop environmentally acceptable and less expensive inhibitors. Some natural products have been evaluated as potential corrosion inhibitors for different metals [2]. We have investigated the effect of plant extract of Prosopis cineraria on corrosion of aluminium [3] and mild steel [4] in acid solution in our earlier communications. The present communication describes the influence of various concentration of the extract of Solanum surrattence on corrosion behavior of aluminium in acid media by mass loss and thermometric measurements. 1.1. Chemical Constituent The fruit extract of plant yields [5] Solamargine, β-Solamargine, Cycloartanol, Cycloartenol, and Sitosterol. Leaves and roots extract yields [6] scopoletin, esculin. Fresh berries contain [7] solasurine, 3,4-di hydroxy cinnamic acid, and caffeic acid. Flowers of this plant yields [8] apigenin, quercetin-3-o-β-D-glucopyranosyl-o-β-D-mannopyranoside
A Potential Corrosion Inhibitor for Acid Corrosion of Mild Steel  [PDF]
Osarolube Eziaku
Materials Sciences and Applications (MSA) , 2017, DOI: 10.4236/msa.2017.86032
Abstract: 1-Phenyl-3-methylpyrazol-5-one (HPMP) was evaluated as corrosion inhibitor for mild steel in hydrochloric, nitric and perchloric acid solutions, using weight loss measurements at room temperature. HPMP was found to retard the corrosion rate of mild steel in hydrochloric and nitric acid solutions, while it aided the corrosion of same metal in perchloric acid solution. Corrosion rate decreased linearly with degree of surface coverage, and higher values of half-life were obtained for the coupons coated with HPMP inhibitor. The thicker the film of the HPMP coating on the metal, the more protection it gave to it, giving rise to the increase in inhibition efficiency.
Experimental Study on a New Corrosion and Scale Inhibitor  [PDF]
Defang Zeng, Huan Yan
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.47077
Abstract:

The mixture consisted of benzotriazole (BTA), chitosan (CTS), polyacrylic acid and zinc salt has been investigated as a corrosion and scale inhibitor of A3 carbon steel in cooling water. The scale and corrosion inhibition efficiency was evaluated by static anti-scaling teat together with rotary coupon test. Compared with the phosphorus corrosion and scale inhibitor, the corrosion inhibition rate and scale inhibition rate of it increased respectively by 2.51% and 1.16%. As the corrosion and scale inhibitor is phosphate-free, it wont cause eutrophication, considering the product performance and environmental influence, the phosphate-free corrosion and scale inhibitor is superior to the traditional one.

Corrosion inhibitor testing in archaeological conservation  [cached]
Robert Faltermeier
Archaeology International , 1997, DOI: 10.5334/ai.0115
Abstract: Metal objects from archaeological contexts often suffer serious damage by corrosion. Various methods for inhibiting corrosion have been developed, but their effects need to be evaluated. Here new research is described on how treatments to inhibit the corrosion of copper and copper-alloy artefacts may be tested.
The Preparation and Performance Study of a Phosphate-Free Corrosion/Scale Inhibitor  [PDF]
Defang Zeng, Wei Zhang
Journal of Water Resource and Protection (JWARP) , 2012, DOI: 10.4236/jwarp.2012.47056
Abstract: By using acrylic acid copolymer, sodium citrate, hydrolyzed polymaleic anhydride (HPMA), corrosion inhibitor D and Zn2+ synergist as raw materials, a multi-component phosphate-free corrosion and scale inhibitor was developed. The performance of the composite phosphate-free corrosion and scale inhibitor was evaluated using the rotary hanging sheet corrosion test, the static scale inhibition test and the corrosion electrochemical test. And the surface morphology of the carbon steel was observed by scanning electronic microscope (SEM). Orthogonal experiment results indicated that the optimal mass ratios of amino acid: Zn2+ synergist: HPMA: corrosion inhibitor D: acrylic acid copolymer was 0.5:10:12:1:8. It was also observed that phosphate-free corrosion and scale inhibitor based on an anodic reaction through the electrochemical corrosion experiment, its annual corrosion rate and scale inhibition rate reached 0.0176 mm·a–1 and 98.3%, respectively, showing excellent corrosion and scale inhibition performance.
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