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Corrosion

Corrosion

Rely on our coating solutions to reduce maintenance costs and extend the service life of your components. We can help you protect against many types of corrosion including those caused by saline, acids, alkali, hot metals, metallic vapors, hot gas, and sulfidation.

Corrosion is an electrochemical process that occurs between a metal and the surrounding environment. This chemical reaction produces oxides and other undesirable compounds.

The corrosion process consists of three components:

  • Anode: the metal subject to the effects of corrosion
  • Electrolyte: acts as the corrosive medium
  • Cathode: completes the electrical cell

Galvanic corrosion

Galvanic corrosion occurs when dissimilar metals are in the presence of an electrolyte, attacking the more anodic metal. This type of corrosion can occur not only between two components of dissimilar metals, but also within a single component. Most often, the electrolyte is a saline, acidic, or alkaline solution or atmosphere.

Crevice corrosion and pitting

This type of corrosion occurs not in broad areas, but in small cracks or pits that form because of low oxygen availability or high anion concentrations. These pits can continue to grow even if the offending species is removed or oxygen is restored. This is because the environment within the pit or crevice will be different than the remainder of the surface. These pits or crevices can result in small, localized stress concentrations that can propagate cracks, leading to component failure.

High-temperature corrosion and oxidation

This non-galvanic form of corrosion occurs when a metal is exposed to an oxidizing atmosphere, such as sulfur or oxygen, under very high temperature for a sustained period. Gas turbine engines and automotive combustion engines are particularly susceptible to this type of corrosion.

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