prepare project report on corrosion and methods applied to prevent it
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barrier coating
One of the easiest and cheapest ways to prevent corrosion is to use barrier coatings like paint, plastic, or powder. Powders, including epoxy, nylon, and urethane, adhere to the metal surface to create a thin film.
Hot deep galvanization
This corrosion prevention method involves dipping steel into molten zinc. The iron in the steel reacts with the zinc to create a tightly bonded alloy coating which serves as protection.
The process has been around for more than 250 years and has been used for corrosion protection of things like artistic sculptures and playground equipment.
Unfortunately, galvanization can’t be done on-site, meaning companies must pull equipment out of work to be treated. Some equipment may simply be too large for the process, forcing companies to abandon the idea altogether.
In addition, zinc can chip or peel. And high exposure to environmental elements can speed up the process of zinc wear, leading to increased maintenance. Lastly, the zinc fumes that release from the galvanizing process are highly toxic.
ALLOYED STEEL
Alloyed steel is one of the most effective corrosion prevention methods around, combining the properties of various metals to provide added strength and resistance to the resulting product. Corrosion-resistant nickel, for example, combined with oxidation-resistant chromium results in an alloy that can be used in oxidized and reduced chemical environments. Different alloys provide resistance to different conditions, giving companies greater flexibility.
CATHODIC PROTECTION
To prevent corrosion, the active sites on the metal surface are converted to passive sites by providing electrons from another source, typically with galvanic anodes attached on or near the surface. Metals used for anodes include aluminum, magnesium, or zinc.
While cathodic protection is highly effective, anodes get used up and need to be checked and/or replaced often which can drive up costs of maintenance. They also increase the weight of the attached structure and aren’t always effective in high-resistivity environments.