Materials Science and Engineering: An Introduction

Published by Wiley
ISBN 10: 1118324579
ISBN 13: 978-1-11832-457-8

Chapter 17 - Corrosion and Degradation of Materials - Questions and Problems - Page 723: 17.27

Answer

Descriptions of the two techniques used for galvanic protection are the following: 1. A sacrificial anode is electrically coupled to the metal piece to be protected, and the anode is also situated in the corrosion environment. The sacrificial anode is a metal or alloy that is chemically more reactive in the particular environment. The anode preferentially oxidizes, and, upon giving up electrons to the other metal, protects it from electrochemical corrosion. 2. An impressed current from an external dc power source provides excess electrons to the metallic structure to be protected.

Work Step by Step

Descriptions of the two techniques used for galvanic protection are the following: 1. A sacrificial anode is electrically coupled to the metal piece to be protected, which anode is also situated in the corrosion environment. The sacrificial anode is a metal or alloy that is chemically more reactive in the particular environment. The anode preferentially oxidizes, and, upon giving up electrons to the other metal, protects it from electrochemical corrosion. 2. An impressed current from an external dc power source provides excess electrons to the metallic structure to be protected.
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