Methods for Preventing Metal Corrosion
One of the most common problems that makers of aircraft, boats, buildings, cars, and most of the other metal products are most concerned about is corrosion. It the process by which metal deteriorates due to various oxidising agents present in the environment. And one example of this is the process of rusting in which iron oxides form due to moisture.
So, what methods can be done to protect metals from corrosion or slow down the rate of corrosion?
The first method is to understand the different types of corrosion of metals. Given that there are so many various types of metals being used today, manufacturers and builders need to find ways to protect their products from corrosion. In order to determine which type of corrosion a metal is vulnerable to, it is imperative to identify the electrochemical properties of the metals. Refer to the list below:
Aluminium corrosion causes pitting and cracks to aluminium but can be treated by cleaning using protective coating, anodisation, galvanisation, electrical insulation, or cathodic protection.
Brass deteriorates when corroded and undergoes dezincification and stress. But corrosion can be obviated through cleaning or using a protective sealant, usually lacquer or oil.
Copper. When hit by corrosion, copper suffers from pitting and aesthetic tarnishing. Just like other metals, corrosion can be prevented by cleaning and using sealants.
Iron corrosion creates cracks to the metal. However, it can be prevented by cleaning, galvanisation, anti-rust solutions, and protective coating or sealant.
Stainless steel. When corroded, the steel cracks, especially when in contact with saltwater. Some common preventative techniques used are cleaning, protective coating, or sealant.
There are five types of corrosion that attack these metals. Here they are with their respective preventive solutions:
Crevice corrosion happens in areas of a metal object where access to the surrounding air or liquid is poor. To minimise the occurrence of crevice corrosion, closing the gaps or allowing circulation in the construction of a metal object can help.
Galvanic corrosion usually occurs when two different metals with dissimilar electrode potentials are in contact with one another due to an electrolyte that generates an electrical conducting path between two metals like saltwater. Such a corrosion can be helped by a protective coating or cathodic protection.
Pitting corrosion. Pitting occurs when a small section of a metal loses its protective layer. Factors that accelerate the pitting process include exposure to chlorides such as salt water.
Stress corrosion. A rare form of corrosion that relates to structural failure is among the many concerns of engineers involved in building structures. It’s known to be intensified by the presence of liquids that contain dissolved chlorides and high temperatures.
Uniform attack corrosion is a type of corrosion that happens in a uniform approach over an exposed surface of a metal. The easiest way to prevent it from occurring is by applying a protective barrier, which can be in the form of an electrochemical solution, oil sealant, paint, or a polyvinyl chloride copolymer solution such as Unituff 452.
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