Oxazolidines as Latent Curing Agents

Friday, April 11, 2014

The corrosion resistance of polyurethane coatings

There are several products available in the market and they will provide a very good corrosion protection, but the polyurethane coatings are some of the best ones that are available in the market.

If you have to understand how they are so good against the level of corrosion then you must understand how the corrosion works also. There are products that are made up of iron, steel, and even some other metals which will return back to their normal process.

The process which the metals undergo is known as the electrochemical process. There are electrons that usually flow from high energy areas of the metal to even the low energy areas and go through a solution that is conducting in the surface of the metal.

The conducting material which is formed is known as electrolyte and this formation is caused due to the water, rain moisture, and even the humidity. You don’t have to have a lot of electrolytes so as to avoid or cause the corrosion. With just 60% you will acquire relative humidity to form electrolytes that will cause the corrosion.

Where there are high energy areas of metal that is known as anode. The current that takes place will leave the electrolyte from the anode and then return to the metal and form polyurethane dispersions.

High energy areas of a metal are called an anode. Current will leave the electrolyte from the anode and return to the metal. The number of pairs of cathodes and anodes are specific to each kind of metal. Metals with more pairs are more susceptible to corrosion. Machined metal surfaces have more pairs, for example. Corrosion can occur within minutes in these metals.