In order to ensure good adhesion between the decorative coating (coating) and the surface of cast iron guardrail, the welding slag, oxide skin, rust, grease, dirt and water on the surface of iron guardrail must be cleaned as much as possible before coating (coating), otherwise it is easy to cause blistering, cracking, cracking, coating (coating) peeling, etc. The so-called pretreatment refers to eliminating the surface defects of iron products before plating (plating) by mechanical or chemical, electrochemical and other process methods.
1、 Methods for rust removal, scale removal and welding slag. The main methods commonly used by cast iron guardrail manufacturers are: manual treatment, mechanical treatment, spraying treatment, electrochemical treatment, chemical treatment (pickling) and flame treatment.
The main tools for manual treatment are abrasive cloth, scraper, hammer chisel, waste grinding wheel, steel wire brush and other tools, and the surface dirt such as rust, scale, welding slag and dust are removed by manual grinding, chiseling and brushing.
Common tools for mechanical treatment include wind (electric) brush, derusting gun, polishing grinding wheel, wind (electric) shovel and other tools. With the help of high-frequency impact and friction of mechanical force, rust scale such as oxide skin and old paint can be removed.
The spraying treatment is driven by mechanical centrifugation, compressed air and high-pressure water flow to spray abrasive, sand and steel shot onto the surface of wrought iron to impact and wipe off oxide scale, rust mark, old paint, molding sand, etc.
Chemical treatment is to soak and dissolve the cast iron guardrail with the acid solution of specific ingredients, and clean up the oxide scale, rust mark and oil stain through chemical reaction, that is, the "pickling".
2、 Cast iron guardrail can be used by organic solution, alkali solution, electrochemistry and other methods. At present, the metal cleaning agents sold on the market are also more suitable.
There are many processing technologies for cast iron guardrail. If you want to know about other process products, please consult the cast iron guardrail manufacturer. We look forward to your call.