Sandblasting for rust removal: preparing metal surfaces for corrosion protection and paint.
Applying paint and varnish materials to metal structures is a specific sequence of actions and a very complex process that requires knowledge, professional training, and specialized equipment. First, the surface must be prepared. The most effective surface preparation method is abrasive blasting, commonly known as sandblasting. Various abrasive materials include quartz sand, nickel slag, copper slag, and grit or round shot.
Sandblasting technology for metal, brick, and concrete
Abrasive blasting (sandblasting) of metal involves damaging the surface with an abrasive, which removes unwanted layers, rust, and scale, roughens the surface, and prepares it for subsequent application of anti-corrosion coatings. Abrasive particles are atomized by compressed air or liquid (in the waterjet method).
Sandblasting requires specialized skills and a fully organized quality control system. For safety reasons, when working in confined spaces, a supply and exhaust system must be present in the abrasive blasting area. Personnel must be outfitted with appropriate personal protective equipment.
Sandblasting tanks and reservoirs require an even greater degree of safety, as the surface is treated within a closed or semi-closed circuit with controlled climatic parameters (humidity, temperature, dew point).
Advantages Sandblasting of Metal
Sandblasting removes old coatings, rust, mold, and scale from metal surfaces, and cleans structures of soot. It also removes cement laitance from concrete surfaces, imparting the required roughness.
Sandblasting is also used for decorative finishes on wood and brick. Beyond its cleaning efficacy, abrasive blasting substantially enhances the longevity of applied coatings, leading to longer-lasting structures and reduced costs for future repairs and installations. Compared to mechanical cleaning methods like brushes or grinders, abrasive blasting is the most advanced and cost-effective surface preparation method, making it the preferred choice for professional applications.
Sandblasting or sandblasting is the most technologically advanced and cost-effective method of surface preparation, making it the most popular and professional method compared to mechanical cleaning using brushes or grinders.
Moreover, when manually cleaning steel using hand tools, it is impossible to remove factory mill scale from the metal surface.
According to GOST 9.402-2004, sandblasting of metal is classified as a second-degree cleaning (Sa 2.5 according to ISO)
For industrial facilities and metalworking plants, blast cleaning of metal is optimal in terms of surface preparation speed and the subsequent quality of the resulting anti-corrosion coatings.
