翻訳と辞書 Words near each other ・ Anael (disambiguation) ・ Anaelys Fernández ・ ANAEM ・ Anaemosia ・ Anaene ・ Anaene diagramma ・ Anaene improspersa ・ Anaene spurca ・ Anaene squalida ・ Anaeomorpha ・ Anaerobacter ・ Anaerobic ・ Anaerobic C4-dicarboxylate membrane transporter protein ・ Anaerobic clarigester ・ Anaerobic contact process ・ Anaerobic corrosion ・ Anaerobic digester types ・ Anaerobic digestion ・ Anaerobic Digestion and Biogas Association ・ Anaerobic exercise ・ Anaerobic filter ・ Anaerobic glycolysis ・ Anaerobic infection ・ Anaerobic lagoon ・ Anaerobic organism ・ Anaerobic oxidation of methane ・ Anaerobic respiration ・ Anaerobiospirillum ・ Anaerolinea thermolimosa ・ Anaerolinea thermophila Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Anaerobic corrosion ： ウィキペディア英語版 Anaerobic corrosion Hydrogen corrosion is a form of metal corrosion occurring in the presence of anoxic water. Hydrogen corrosion involves a redox reaction that reduces hydrogen ions, forming molecular hydrogen. Metals enter aqueous solution and are oxidized. ''Oxidation reaction (pH independent):'' :$Fe\backslash ;\backslash rightarrow\backslash ;Fe^\backslash ;+\backslash ;2\backslash ,e^-$ ''Reduction reaction in acid solution:'' :$2\backslash ,H^+\backslash ;+\backslash ;2\backslash ,e^-\backslash rightarrow\backslash ;H\_2\backslash ;$ In an acidic solution, the water molecules are protonated and the hydronium ions (H3O+) are directly reduced into H2. ''Reduction reaction in neutral or slightly alkaline solution:'' :$2\backslash ,H\_2O\backslash ;+\backslash ;2\backslash ,e^-\backslash ;\backslash rightarrow\backslash ;H\_2\backslash ;+\backslash ;2\backslash ,OH^-$ In a neutral or slightly alkaline solution, the protons of water are reduced into molecular hydrogen giving rise to the production of hydroxide ions responsible of the precipitation of the slightly soluble ferrous hydroxide (Fe(OH)2). This finally leads to the global reaction of the anaerobic corrosion of iron in water: :$Fe\backslash ;+\backslash ;2\backslash ,H\_O\backslash ;\backslash rightarrow\backslash ;Fe(OH)\_2\backslash ;+\backslash ;H\_2\backslash ;$ ==Transformation of ferrous hydroxide into magnetite== Under anaerobic conditions, the ferrous hydroxide (Fe(OH)2 ) can be oxidized by the protons of water to form magnetite and molecular hydrogen. This process is described by the Schikorr reaction: :''3 Fe(OH)2 → Fe3O4 + H2 + 2 H2O'' :''ferrous hydroxide → magnetite + hydrogen + water'' The well crystallized magnetite (Fe3O4) is thermodynamically more stable than the ferrous hydroxide (Fe(OH)2 ). This process also occurs during the anaerobic corrosion of iron and steel in oxygen-free groundwater and in reducing soils below the water table. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Anaerobic corrosion」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.