LESSON 5
METAL CORROSION AND IDENTIFICATION
OVERVIEW
LESSON DESCRIPTION:
In this lesson, you will learn how to identify corrosion on metal, what causes corrosion, and how to
prevent corrosion.
TERMINAL LEARNING OBJECTIVE:
ACTION:
You will describe the procedures for identifying the types of corrosion, what causes
it, and steps to control it.
CONDITION:
You will be given the material contained in this lesson.
STANDARD:
You must complete the lesson and the practice exercise.
REFERENCES: The material contained in this lesson was derived from the TM 5-800 series, EM
1110-2-3400, and OPNAVINST 5100.23D.
INTRODUCTION
The corrosion of metal is a constant enemy of the military, causing extensive damage to towers,
pipelines, trucks, aircraft, and almost any other item made of metal. Corrosion quietly eats away the
understructure or heart of a system. The problem is never-ending. In this lesson, you will learn how to
identify corrosion, find out what causes it, and learn how to control it on various types of metal.
PART A: CORROSION
5-1. Definitions. Since the corrosion of metal results in such tremendous loss of materials, time, and
money, just what is corrosion? Let's consider three different definitions:
An engineer from the Electrochemical Society of New York stated, "Corrosion is the
destruction of a metal by chemical or electrochemical reaction with its environment."
A reservoir engineer says, "Corrosion is a process of nature designed to increase the
horizontal permeability of the casing."
5-1
EN0562
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