This chemical conversion process immerses steel into a heated phosphoric acid solution containing zinc or manganese salts. The reaction creates a crystalline phosphate layer bound directly to the base metal. It provides a porous, textured base that holds paint or lubricants tightly while resisting under-film corrosion.
Heard on the job
The spec calls for bonderization before we apply the powder coat to ensure it sticks.
Also heard as
- phosphating
- Parkerizing
Related terms
Bonderize
To treat a steel surface with a phosphate conversion coating to improve paint adhesion and corrosion resistance.
Coslettize
To apply a protective phosphate coating to iron or steel by boiling it in a solution of phosphoric acid and zinc or iron filings.
Anchor profile
Peak-to-valley roughness that blasting cuts into steel so a coating can grip, given in mils or microns.