In order to know more, one must know the basic and that paint is classified into three main categories, the primers, intermediates, and finishing. Primers are applied in order to wet the surface area and make sure it sticks to the metal surface. It is also the base level which will protect the steel from corrosion. The next coating is called intermediates which are designed to add thickness to the film. The last coating which is the finishing is used mainly to give a better appearance to the surface while adding to the resistance of the metal surface. There are various environmental conditions where the steel may be exposed and the finish coating is the one that should act as the first cover in case of exposures such as sunlight and harsh weather conditions.
When it comes to protective coating systems used in metals, there are four types available: sacrificial, barrier, inhibitive, and combination. The barrier is the coatings that provide protection against elements such as electrolyte, water and oxygen that might touch the surface of the metal under the coating. The inhibitive coating is responsible in preventing corrosion because it has added chemicals to counter and causes reaction when in contact with anode, cathode, acid, electrolyte and oxygen. The sacrificial coating is the one responsible in making sure that the material has galvanic protection. This means that the coating will corrode instead of the metal under. The reaction then reverses the cells which caused the corrosion and converts all anodes into cathodes.
Types of Protective Coating Systems
Two-Component Epoxy. Though there are many choices when it comes to protective finishes, the one most favored by many industries is the epoxy coating. This was designed as coating to heavy duty materials such as iron and steel. This is termed as two-component because it contains two coatings, the primer and finishing.
Hot Dip Galvanizing. Galvanized steel is often used in applications where the equipment will be frequently or more likely to be exposed to UV rays. Galvanized steel has a Zinc coating which serves as a protection against corrosion. This can be used longer than most materials and can be recycled so it is eco-friendly.
Powder Coating. Its finish resembles that of paint but it is applied using dry powder. It is more expensive compared to other coatings but its resistance against impact is very high.