Heavy rust

Heavy rust treatment

Operating principle

Removing rust through a chemical process is a very simple and efficient alternative to sanding and blasting. Rust on steel in different alloys turns out well to dissolve in acid.

Benefits of using Ranex:

  • Requires little manual power
  • Works fast, thorough and efficient

Ranex Rustbuster is based on phosphoric acid and the great advantage of this acid is, that it has no aggressive reactions on material and coating, but it will only react with rust and the mill scale (during a rolling process, iron oxides are pressed in the steel surface). The specific gravity of Ranex Rustbuster is 1.2 and the surface tension is lower that of water. This makes it to penetrate deeply into the surface to destroy the pollution (rust). It is also pushes out moisture that was still present within the rust. This causes the rust to be made inactive up to its core. It also enters hard to reach places.

The detrimental oxide (rust) is destroyed pore deep. The rest product is a beneficial iron phosphate, an inactive substance, that provides good adhesion to the new coating. During the drying process of about 24 hours, the rust is converted and a temporary protective layer is formed. For some weeks, the treated surface is protected, provided in dry environment. For long term protection a coating must be applied.

Required surface condition

  • Remove oil, grease, chemicals, loose paint and loose rust
  • In old and thick rust, the surface could be phosphated, then it is helpful to first open the surface with coarse sandpaper or a wire brush.
  • The area to be treated must be dry

Application method for destroying rust

  • Apply Ranex Rustbuster on the dry surface with (block) brush, roller or brush
  • Remove overflowing Ranex Rustbuster on the surrounding material (coating or metal) with a damp cloth
  • Allow it to dry for at least 24 hours
  • in case the surface becomes wet during the drying process, a whitish, powdery substance that occurs is phosphate. Removal of this powder is not necessary, because it will resolve in the coating to be applied for long term conservation
  • After drying, the surface is suitable to be coated with a primer (1-or 2-component)
  • It is not required to use anti-corrosion paints
  • Waterborne paints and zinc-rich paints are not recommended
  • Average consumption is about 1ltr. for 8 m2 heavy rust or for 30 m2 of superficial rust and rust stains

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