The type of surface preparation needed for steel surfaces will depend on the level of existing corrosion, the level of cleanliness desired, and others factors such as the ability to use as specific method in the existing environment (e.g., will abrasive blasting be permitted in certain areas due to cleanliness issues, etc.). There are several methods to remove old paint and rust from steel surfaces, including:

• Solvent Cleaning
• Hand Tool Cleaning
• Power Tool Cleaning
• Dry Abrasive Blasting
• High- and Ultra-High Pressure Waterjetting

Using these methods results in the removal of old paint, mill scale, rust and corrosion products, dirt, oil, grease and other contaminants to varying degrees. In general, visible grease and oil should be removed by Solvent Cleaning prior to using one of the other methods. One object of methods such as dry abrasive blasting is to also provide a profiled surface or anchor pattern, which aids in physical adhesion of the coating. When bare steel is exposed, primer should be applied as soon as possible to prevent flash rusting of the metal.

Several organizations provide specifications describing the proper methods for the surface preparation techniques listed above. The SSPC: The Society of Protective Coatings provides both specifications and visual standards for the various methods. The visual standards depict the various degrees of surface cleanliness that might be achieved when using the methods listed above. For example, when using a method such as dry abrasive blasting, rust can be removed in varying degrees all the way to bare, white metal. Click here for a brief description of the various specifications available.

Return to Main Page