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Galvanizing

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الكلية كلية الهندسة/المسيب     القسم هندسة السيارات     المرحلة 3
أستاذ المادة جعفر هادي عبود المياح       31/10/2018 12:41:56
Why Galvanize?
Quite simply, galvanizing a metal gives it anti-corrosion properties. Without the protective zinc coating, the metal would remain
exposed to the elements and potentially oxidize and corrode much faster. Galvanized Steel
(https://www.metalsupermarkets.com/metals/galvanized-steel/) is a cost effective alternative to using materials such as austenitic stainless steel (https://www.metalsupermarkets.com/metals/stainless-steel/) or aluminum
(https://www.metalsupermarkets.com/metals/aluminum/) in order to prevent corrosion.
How Does It Work?
Galvanizing can protect metal is a number of ways. Firstly, it creates a protective coating that shields the metal from the surrounding environment. The layer of zinc prevents water and moisture and other elements in the air from corroding the steel underneath. Should the zinc coating be scratched deep enough, the metal would become exposed and susceptible to corrosion.
Galvanizing can also protect metal through a process called “galvanic corrosion”. Galvanic corrosion occurs when two metals of a different electrochemical make up are placed into contact with one another with an electrolyte present, such as salty water.Depending on the atomic structure of the two metals, one metal is the anode and the other is the cathode. The anode corrodes more rapidly than it would by itself and the cathode corrodes at a slower pace than it would by itself. The reason zinc is used for
galvanizing is because it has an affinity towards being the anode when in contact with many different types of metals. Since the zinc
coating in contact with the base metal is usually the anode, it slows the corrosion of the base metal, or the cathode.

المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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