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Protecting Steel. Steel is a widely used construction material. Its corrosion resistance is fairly low, however. Therefore corrosion protection is important, particularly for marine applications. Paint is a common form of protection. Stops oxygen from reaching the steel. If the paint is damaged rust will form at the scratch. Plating the steel with a tin can prevent oxidation.
Adheres much better than paint. However, if scratched rust will still form. Galvanising is another common protection method. Steel is coated with a more reactive metal which oxidises preferentially to steel. If scratched the steel won’t rust at the scratch. Plastic can be used as a coating. Fine particles are attached to the steel by electrostatic attraction the melted onto the steel.
This forms a strong film. Some forms of paint can actually cause Iron to passivate. Since ships are exposed to harsh environments (saltwater) protection of their hulls is paramount. There are 2 main methods outside of the list already present. Surface alloys are used to protect the hull. By bombarding the metal with high energy chromium ions a stainless steel alloy can be formed on the outer surface of the hull.
Polymer paints have also been used to great effect. Rustmaster Pro is an example. Forms an impervious layer and also causes the surface atoms of the steel to form an ionic compound called pyroaurite. This adds more protection to the hull surface.
