Corrosion inhibitor

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    lead in pipes delivering the water to Flint’s citizens. In the late 1980s, the United States began to ban the use of lead pipes and solder. While this was a positive step forward, it could not change the misdeeds of the past. About 50% of homes in Flint still use lead service lines and other homes may have copper pipes with lead solder. This was not a problem when Flint used Detroit’s drinking water because Detroit added corrosion control chemicals such as a phosphate corrosion inhibitor to keep the lead out of the water that runs through the pipes. The phosphate would oxidize before the metal in the pipes would, galvanize and create a passivation layer, protecting the inside of the pipes from corrosion. When the Flint water treatment plant began treating the water from the Flint River, it opted out of the addition of these inhibitors. This causes the passivation layer to begin to dissolve, allowing mineral particles to flake off of the inside of the pipe, corrupting the water. The combination of this very corrosive water source and the lack of a corrosion inhibitor had dangerous results. When researchers from Virginia Tech investigated…

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    Study of Stress Corrosion Cracking (SCC) in Alloys Jiang Jingxing 1. Introduction of Stress Corrosion Cracking Stress Corrosion Cracking (SCC) is the growth of cracks with a under the combined effects of a static stress and a specific chemical environment. All SCC failures involve a macroscopic brittle performance, and the ductility of the material is reduced. It is universally acknowledged that there is no single mechanism for stress corrosion cracking (Ford, 1984). Stress…

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    Most corrosion is an electrochemical reaction. Anything that affects the speed of the chemical reaction will in turn affect the amount of current flow, which will affect the rate of corrosion. The rate of corrosion is directly proportional to the amount of current in the electrochemical corrosion cell. If the current can be measured accurately, then an exact calculation of the metal loss can be made. 2.2.1 ELECTRICAL EFFECTS ON THE RATE OF CORROSION Any issue that have an effect on the…

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    Carports are like the garage spaces you have in your houses. It functions the same way in giving protection to your cars. The only difference is that carports are not fixated. Instead, it is a portable and retractable device you can bring with you in your outdoor trips. The best carports for this generation are the ones made of metal, usually of aluminum or steel. There are also that has core panels made of insulated polystyrene foam. This is also wrapped with steel or aluminum. Most metal…

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    All metal manufacturing includes a solidification process. The metal is either atomised to a powder, or it is cast. There is several casting methods used today. Many of the methods use the mould only once, for example sand mould casting, the lost-wax method and precision casting. For larger quantities of liquid metal, there are basically two methods: ingot casting and continuous casting. Ingot casting normally uses a permanent mould made by cast iron isolated by ceramic material. There are…

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    Gravestone Research Paper

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    The material of choice for gravestones today is generally granite, since it is durable and comes in a variety of crystalline textures and colors. Bronze gravestones are also worth mentioning here though, as they are also a popular choice. Whatever the choice of material, gravestone memorials need regular tending in order to maximize their durability and to keep inscriptions as legible as possible. It is also a nice way to show that you are still thinking about the person who has passed away. …

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    modification of these properties pave the way for future research in inhibitor technology. Introduction The inherent protection of metals and their alloys used in industry are of the upmost importance when it comes to longevity and reliability of structures. Many chemical compounds have been developed over the years that can inhibit the corrosion rate of metal alloys but cost effectiveness, toxicity, processibility and other factors limit the applications1. The need for new, eco-friendly and…

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    Stray current corrosion: Stray current is the current which occurs when conductors are placed between high magnetic or electric fields. Presence of stray currents over the PCB surface can generate corrosion problems. The below figure 5 shows severe corrosion damage to micro wave module for 24 GHz. This equipment is built in controlled conditions where water condensation is possible. After few hours of use, severe corrosion was seen on the surface. Figure 5. Stray current corrosion of a micro…

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    Making The Case For Metal Roofing: The Pros Outweigh The Cons By A Long Shot What your roof is made of makes a big difference in how your home takes care of you and your family. For the following reasons, metal is, more often than not, the best choice for the job. The Pros Of Metal Roofing Longevity A metal roof is likely to remain functional and intact for as long as the home it covers does, resisting weather, rot, infestations and water all the while. According to one industry study, your…

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    Teflon Research Paper

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    Moreover, Teflon can used in chemical manufactures such as hoses that can endure very high erosive substance and sometimes, it need to move at very high of levels heat. Teflon have coating in the inner pipe and it used in erosion resistance and flexibility. Every hose will break over time, but those hose that have Teflon coating in the inside can be broken slowly than any other hoses that made of other materials because those materials do not have the same feature with Teflon. Also, Teflon…

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