:::::Welcome to the World of Industrial Paints Manufacturer, MOHAN PAINTS :::::

:: Significance of Surface Preparation ::

As said earlier corrosion is an electrochemical phenomenon. Most of the Primers are therefore designed to behave electrochemically at the surface by providing a passive layer and cathodic protection by sacrificing itself in performance to iron any obstructions in the form of rust, grease or oil paints will affect the electrochemical link of pigment at the surface. Therefore, the performance of painting system depends greatly on how best these obstructions are removed, the exercise being known as Surface Preparation.

What are the obstruction are generally found on the surface and how are they removed.?

1.	Grease - Oil – Dust etc.
2.	Moisture
3.	Acid – Alkali
4.	Welding
5.	Rust and Mill Scale

:: Grease - Oil – Dust etc. ::

Before application of paints the surface should be free from any Grease, Oil, Dust or Loose Particles. The presence of this material on the surface results in poor adhesion and poor drying of the paint film. Immediately before painting, all lose material should be clean from the surface by dusting, brushing or wash down. Grease and oil should be removed with solvents or by means of steam jet.

:: Moisture ::

The presence of condensed moisture may cause severe corrosion under the paint film. Therefore before painting the surface should be dry.

:: Acid – Alkali ::

Acid or Alkali remaining on the surface will accelerate corrosion reaction underneath the paint film. This generally happen if a surface is in properly treated with pickling acid or alkali cleaning or when atmosphere is acidic or alkaline.

:: Welding ::

if the welding is not carried out correctly it can cause corrosion. The runs of welding are rough, making a difficult to ensure adequate and complete coverage by paints. The runs of welding should be carefully removed by mechanical and abrasion cleaning.

All the above operation to clean the surface before the painting is adequate for conventional types of paints with limited performance life.

In a severally corrosive atmosphere, to it saline or heavily chemically polluted areas, only high performance coating with longer life span are recommended. These coating have poor adhesion on a normally prepared surface in order to realize the full value of these expensive coating materials special methods of surface preparation are employed.