Engineering Materials Msc. Shaymaa Mahmood Introduction to Eng. Materials : Since the earliest days of the evolution of mankind ‚ the main distinguishing features between human begins and other mammals has been the ability to use and develop materials to satisfy our human requirements. Nowadays we use many types of materials‚ fashioned in many different ways‚ to satisfy our requirements for housing‚ heating‚ furniture‚ clothes‚ transportation‚ entertainment‚ medical care‚ defense and all the
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beach‚ lemon water and salt water. To get started‚ the metal contents should be established. Today’s pennies are mostly made of zinc with a thin layer of copper overcoating. A nail is a form of carbon steel or black iron. Paper clips are made from a low grade steel. A needle is made from stainless steel. Examining the liquids and lemon juice is a citric acid. It should have corrosive actions on some of the metals‚ but not all. I believe
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Animals Wa aeG Aias (ne ht r M nml? An) Gntc mdfcto o a aia ivle atrn is gntc eei oiiain f n nml novs leig t eei mtra b adn‚ cagn o rmvn cran DA sqecs i a aeil y dig hnig r eoig eti N eune n wy ta de nt ocr ntrly I am t mdf seii a ht os o cu aual. t is o oiy pcfc caatrsis o a aia o itoue a nw tat sc a hrceitc f n nml r nrdc e ri‚ uh s dsae rssac o ehne got.DAi tegntcmtra o ies eitne r nacd rwh N s h eei aeil f a ogns ad cris te isrcin fr al te caatrsis n raim n are h ntutos o l
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the crystal structures of iron. Substitutional alloyIt is formed when the solute atoms take up positions of solvent atoms in the crystal lattice. If the two metal atoms are about the same size and have the same crystallographic structure‚ then the two metals may form a solid solution. Brass‚ an alloy composed of copper and zinc‚ is an example of a substitutional alloy. Alloys have different applications depending on their properties. The various types of steel and iron are all alloys classifiable
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temperature. A. Creep B. Thermal Fatigue C. Cyclic Cracking D. Stress Corrosion Cracking 4. General or localized corrosion of carbon steels and other metals caused by dissolved salts‚ gases‚ organic compounds or microbiological activities is called . A. Flue Gas Corrosion B. Atmospheric Corrosion C. Cooling Water Corrosion D. None of the Above E. All of the Above 5. 5. What structure is 410 stainless steel?
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meet the above functional requirements the material used for manufacturing the product should contain many properties. They are‚ the material should contain high strength‚ modulus of elasticity‚ wear resistance‚ ability to withstand vibrations‚ and corrosion resistance. High strength is mostly concerned in diesel engines because of their high compression ratios compared with petrol engines. In diesel engine its compression ratios are normally 17:1 or greater‚ but in petrol engine it is nearly 10:1. The
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Production and Properties of Metals Mr J E Chuter‚ Cert Ed 2012 En No 20100292 Introduction I have decided to produce a project based on the production and properties of metals‚ as although I have worked as a welder for over 30 years‚ and a welding teacher for the last 2 years on apart-time basis‚ I felt I didn’t know enough information on the material that I work on‚ on a daily
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Advantages: Sulfamic acid is the fastest de-scaler - It dissociates into hydroxonium ions more readily in aqueous solution than the others‚ therefore giving a greater concentration of atoms that are able to react with the calcium in lime scale. It is safe to use because it does not produce chlorine gas [5]‚ which can be toxic. Sulfamic acid also has a low volatility. Disadvantages: Sulfamic Acid can be an irritant to eyes or skin and is the most expensive of the de-scalers. Q2) How these de-scalers
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of Al2O3 (called a passivation layer) that protects the foil from further corrosion.[2]Different oxides of the same element are distinguished by Roman numerals denoting their oxidation number‚ e.g. iron(II) oxide versus iron(III) oxide. 1 Formation 2 Structure 2.1 Molecular oxides 3 Reactivity 3.1 Reduction 3.2 Hydrolysis 4 Nomenclature and formulas 5 Examples of oxides 6 See also 7 References Formation Main article: corrosion Due to its electronegativity‚ oxygen forms stable chemical bonds with almost
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Theory What is rust? Rust is the common name of a compound‚ iron oxide. Iron oxide‚ the chemical Fe2O3‚ is common because iron combines very readily with oxygen -- so readily‚ in fact‚ that pure iron is only rarely found in nature. Iron (or steel) rusting is an example of corrosion -- an electrochemical process involving an anode (a piece of metal that readily gives up electrons)‚ an electrolyte (a liquid that helps electrons move) and a cathode (a piece of metal that readily accepts electrons)
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