Реферат: Corrosion And Rusting Essay Research Paper Corrosion
⚡ 👉🏻👉🏻👉🏻 ИНФОРМАЦИЯ ДОСТУПНА ЗДЕСЬ ЖМИТЕ 👈🏻👈🏻👈🏻
Corrosion And Rusting Essay, Research Paper
Some people may be annoyed by their car ?wearing out?. Kids may have trouble with rust forming on their bicycles. One may think how to prevent rusting, but do one knows what is happening when a metal corrode?
?Corrosion is defined as the involuntary destruction of substances such as metals and mineral building material by surrounding media, which are usually liquid (i.e. corrosive agents).? Most metals corrode. During corrosion, they change into metallic ions. In some cases, the product of corrosion itself forms a protective coating. ?For example, aluminium forms a thin protective oxide layer which is impervious to air and water. In other cases (e.g. iron), however, the coating either flakes off or is pervious to both air and water. So the whole piece of metal can corrode right through.?
The most common forms of metallic corrosion are caused by electrochemical reactions, wherein two metallic phases (e.g., iron oxide and iron) react in the presence of electrolytic solution. Another mechanism of metallic corrosion is caused by chemical reaction, which explains how the protective layer of the metal is formed.
Rusting is the corrosion of iron which is the most widely used structural metal. Most of it is used in making steel. The wide range of products made from steel includes all types of vehicles, machinery, pipelines, bridges, and reinforcing rods and girders for construction purposes. Therefore, rusting causes enormous economic problem and is the reason why extensive measures of corrosion protection have had to be developed.
The economic importance of corrosion and corrosion protection can be shown by the following example: ?It is estimated that roughly 3% of the annual production of steel is lost by corrosion. In 1974, 140 millions tons of steel were produced in the United States at a cost of approximately $400 per tons. So this gives a monetary loss of about 1.7 billion dollars.? It is clearly of the utmost importance to reduce as far as possible the financial loss by corrosion, which not only affects steel but to the extent all other building metal as well.
It is obvious that corrosion and rusting affect significantly the life of the society, so it is worthy to investigate this topic. In this essay, the cause of the corrosion and rusting and consequently the protection of the corrosion will be explored.
Electrochemical corrosion reactions
This type of corrosion takes place when two metallic phases with different electrochemical potentials are connected to each other by means of an electric conductor.
Electrolytes such as acids, alkalis, salt solutions, or even milder media (e.g., rainwater, river water, groundwater, or tap water) also need to be present. ?Metallic phases with different electrochemical potentials exhibit electric potential differences. Potential differences may also arise because of impurities, internal stresses, corrosion products, damaged protective coatings, etc. They also occur when different metals are used. The larger the potential difference, the faster the rate of corrosion.?
The electrochemical EMF series (Table 1) gives the electrochemical potential of metals under normal conditions with respect to hydrogen (hydrogen is 0). The farther two metals in electrochemical series are apart, the larger the potential difference between them. A metal is said to be less noble than those which stand
Название: Corrosion And Rusting Essay Research Paper Corrosion
Раздел: Топики по английскому языку
Тип: реферат
Добавлен 20:26:59 15 ноября 2010 Похожие работы
Просмотров: 3
Комментариев: 14
Оценило: 2 человек
Средний балл: 5
Оценка: неизвестно Скачать
Срочная помощь учащимся в написании различных работ. Бесплатные корректировки! Круглосуточная поддержка! Узнай стоимость твоей работы на сайте 64362.ru
Привет студентам) если возникают трудности с любой работой (от реферата и контрольных до диплома), можете обратиться на FAST-REFERAT.RU , я там обычно заказываю, все качественно и в срок) в любом случае попробуйте, за спрос денег не берут)
Да, но только в случае крайней необходимости.
Реферат: Corrosion And Rusting Essay Research Paper Corrosion
Сочинение Тропинка В Лиственном Лесу
Курсовая работа по теме Ремонт кузова после повреждения заднего правого крыла на примере автомобиля Toyota Corolla
Сочинение Мой Фет 9 Класс Кактус
Контрольная Работа По Массе 2 Класс
Фискальная Деятельность Таможенных Органов Рф Магистерская Диссертация
Задачи и методы педагогической психологии
Виды и функции налогов
Контрольная работа по теме СУБД SQL-Server: основные особенности и ее применение
Реферат: Налоги зарубежных стран и их особенности. Скачать бесплатно и без регистрации
Л и т е р а т у р а
Реферат На Тему Європейський Союз: Процес Формування Та Перспективи Розвитку
Дипломная работа по теме Разработка проекта швейного потока с детальной проработкой технологического потока по изготовлению женского демисезонного пальто
Контрольная работа по теме Конституция Франции 1958 г.: исторические условия и порядок принятия, структура и основные черты
Реферат На Тему Рост Производительности Труда За Счёт Социально-Экономических И Организационных Факторов Дуп "Пмк-194"
Реферат Гигиена Тела
Доклад по теме К вопросу об аренде коммерческой недвижимости
Контрольная Работа На Тему Джерела Аудиторських Доказів
Реферат На Тему Особенности Древнерусской Литературы
Политические Права Эссе
Детская Книга Реферат
Курсовая работа: Трансформация отчетности в соответствии с МСФО
Доклад: О выборе полового партнера
Реферат: Truman Show Essay Research Paper Truman Show