MANUAL Published: 08 November 2019

Chapter 41 | Corrosion


Per NACE/ASTM G193, corrosion is “the chemical or electrochemical reaction between a material, usually a metal, and its environment that produces a deterioration of the material and its properties.” In fuel and lubricated systems, including engines, tanks, pipes, machinery, bearings, and gears, the fuels and lubricants are exposed to oxygen and water from the environment. Water becomes the electrolyte necessary for the electrochemical reaction to occur. This is a natural process that converts a refined metal to a more stable form, such as its oxide or hydroxide. Most fuels and lubricants are formulated with corrosion inhibitors. Without control, corrosion can affect the appearance and function of metals, especially iron and steel. When exposed to moisture, ferrous metals react with oxygen to form an oxide that does not firmly adhere to the metal surface. This oxide flakes off, leading to disintegration of the metal that can not only impair its functionality but also can result in catastrophic failure. This chapter outlines the nature of ferrous and nonferrous corrosion, the common additive approach to inhibiting corrosion, and the tests employed to evaluate the effects and prevention of the corrosion of metals in contact with fuels and lubricants.

Author Information

Hunter, Maureen
King Industries, Inc., Norwalk, CT, US
Baker, Robert
King Industries, Inc., Norwalk, CT, US
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Developed by Committee: D02
Pages: 1405–1416
DOI: 10.1520/MNL3720160011
ISBN-EB: 978-0-8031-7090-2
ISBN-13: 978-0-8031-7089-6