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Home > Knowledge Centre > Pre-Treatment before Powder Coating

PRE - TREATMENT BEFORE POWDER COATING

Although paint can be applied to bare steel & other metal surface without pretreatment, but it is not recommended .The bond between paint & metal barely adequate. Corrosion protection is not existent.

Pre-treatment is pre-conditioning of a surface to be powder coated so that it accepts a coating, which looks attractive, adheres well, lasts long & protects what's underneath.

Pre-treatment is normally undertaken by dipping the workplaces in chemicals diluted by water.

For different type of metals following methods of pre-treatment can be applied.

FOR STEEL & MAZAK (ZINC PHOSPHATING)
  • De-greasing
  • Water Rinse
  • De-rusting
  • Water Rinse
  • Water Rinse (optional)
  • Phosphate
  • Water Rinse
  • Passive.

This is a zinc phosphate process recommended for excellent adhesion & long-term corrosion resistance properties.

FOR STEEL & MAZAK (IRON PHOSPHATING)

  • De-rusting
  • Water Rinse
  • Phosphate

This is an iron phosphate process recommended for excellent adhesion & medium duty corrosion resistance. Recommended for indoor use only.

FOR ALUMINUM OR GALVANIZED STEEL
  • De-greasing
  • Water Rinse
  • Etching (optional)
  • Water Rinse
  • Chromating
  • Water Rinse

This is a chromating process in order to guarantee optimum adhesion & excellent protection to corrosion.

A series of factors like metal type and quality, surface conditions, i.e. degree of oil & rust present & environmental condition etc. affect the type of pre-treatment needed.

With our wide experience we may be able to suggest a better and economical technique. Please get in touch with us.

This information is a guideline & we hope you have a good idea on the steps to proper pretreatment.


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