Corrosive effects

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  • The Pitting corrosion book covers recent research challenges and various accomplishments in the field of corrosion. The book is a proven record of excellent scientific achievements in the field of pitting corrosion. Pitting corrosion involves local dissolution followed by the formation of cavities on metals surfaces coated with a passive film, when exposed to an aqueous solution containing aggressive anions, such as chloride and sulfate. Pitting is one of the most destructive forms of corrosion, as it causes potential failure of metals and alloys due to perforation/penetration....

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  • A series of seven azomethines has been synthesized from p-nitrobenzaldehyde and different substituted anilines. The structures of products have been determined by the data of IR-spectra. All obtained azomethines have metallic inhibition corrosion capacities on CT-3 steel and aluminum in different levels: the protection effects were 41-57% on CT-3 steel and 83-92% on aluminum. The influences of structures to their metallic inhibition corrosion capacities have been discussed.

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  • Number of the equipments used in everyday life remarkably increased after the invention of synthetic polymers, especially of styrene-butadiene rubber in 1930 and of PVC in 1936, and thanks to fast-developing polymer technologies. Polymers are light, cheap and ductile inert materials, which have good mechanical and thermal properties, suitable to use for various purposes and are highly resistant to corrosion. Thanks to such properties, they play an essential and ubiquitous role in many industrial fields.

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  • This paper describes the corrosion behaviour of the positive and negative electrodes of a lead–acid battery in 5 M H2SO4 with binary additives such as mixtures of phosphoric acid and boric acid, phosphoric acid and tin sulphate, and phosphoric acid and picric acid. The effect of these additives is examined from the Tafel polarisation curves, double layer capacitance and percentage of inhibition efficiency.

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  • Tuyển tập các báo cáo nghiên cứu khoa học trên tạp chí khoa học vật lý quốc tế đề tài: Effect of Temperature on Corrosion Behavior of AISI 304 Stainless Steel with Magnesium Carbonate Deposit

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  • Weld toe improvement methods have been widely investigated and have, in most cases, been found to give substantial increases in fatigue strength. However, there are large variations in the actual improvements achieved, and the results obtained by various methods are not always ranked in a consistent manner. One explanation for the observed varia tions is the lack of standardization of the optimum method of application, but variations in the material, type of loading and type of weld detail may also have influenced the results.

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  • The pH values will bring effects in flora and fauna nearby, change the taste of water and lead to heavy corrosion in pipe lines. High conductivity naturally indicates the presence of ionic substances dissolved in the river water. However, the result showed that 90% of the study site exceeded the data reported for non-contaminated rivers due to excessive metal ions within the water. At the site nearer to kaolin industry the conductivity is 852 times higher than the non-polluted study site. The industrial discharge also changed the hardness in river water.

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  • Aluminium alloys have undergone a dramatic transformation in areas of extrusion, machining, welding, heat treatment, structural changes, created by ultra fine particles and enhanced corrosion resistance. Hence, these alloys have made rapid gains in European automotive and space industry. These developments have been described by experts in the book with new data and attractive graphics. The effect of processing parameters, including welding and deep rolling on their performance have been highlighted to alleviate the concerns of manufacturers and designers for new applications.

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  • content decreased (Agblevor et al. 1994). The equivalents of chlorine per equivalent of alkali or alkaline earth metals increased from 3.4 to 8.5 during this filtration. This suggests that the residual inorganics may be present as chlorides and that much of the chlorine may be in solution. Chloride ions in solution will have an adverse effect on corrosion of many metals, including stainless steels such as SS304. Compared to coal and many crude oils, biomass has a low sulfur content.

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  • Introduction: Cresol is being used for an antiseptic, disinfectant, maggot-killing agent and cresol soap solution. Since various kinds of more powerful and odorless disinfectants have nowadays become available in practical use, the frequency in the use of cresol seems decreasing. However, the cases of acute poisoning by cresol are still being reported at the present time. The toxic effects of cresol are due to its corrosive actions, resulting in the destruction of cell membranes and coagulation of proteins, and its suppressive action on the central nervous system [1].

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  • Some of the suggestions in this book may be helpful or at least have a placebo effect. Beware of the many recipes that include kerosene (coal oil), turpentine, ammonium chloride, lead, lye (sodium hydroxide), strychnine, arsenic, mercury, creosote, sodium phosphate, opium, cocaine and other illegal, poisonous or corrosive items. Many recipes do not specify if it is to be taken internally or topically (on the skin). There is an extreme preoccupation with poultices (applied to the skin, 324 references) and "keeping the bowels open" (1498 references, including related terms)....

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  • Because of the diversity of the types of systems, fluids, and environments in which valves must operate, a vast array of valve types have been developed. Examples of the common types are the globe valve, gate valve, ball valve, plug valve, butterfly valve, diaphragm valve, check valve, pinch valve, and safety valve. Each type of valve has been designed to meet specific needs. Some valves are capable of throttling flow, other valve types can only stop flow, others work well in corrosive systems, and others handle high pressure fluids.

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  • The corrosion rate of the CT3 steel in 1 N and 2 N hydrochloric acids was measured by electrochemical polalization method. The measuring values of icorrosion showed that alcoholoamines influence on the inhibition corrosion of the CT3 steel in the hydrochloric acid solution and these values are increased in the order: monoethanolamine < diethanolamine < triethanolamine. In the solution of HCl 1 N and 2 N, the inhibition on the corrosion of steel CT3 of mixture of alcoholamines and potassium iodide is more effective than partial components.

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  • Effect of sodium nitrite on the carbon steel corrosion inhibition in the aerated neutral (pH 7) and alkaline (pH 11) water solutions at temperatures from 30o C to 140o C has been investigated by mass loss, potentiodynamic polarization and electrochemical impedance spectroscopy methods. Sodium nitrite was added in concentrations: 200, 350, 500, 750, 1000, 1500 and 2000 ppm by mass.

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