Thin-film chemistries deposit a zirconium or titanium oxide layer measured in milligrams per square meter rather than per square foot. They run at or near room temperature, make almost no sludge and carry none of the zinc, nickel or manganese of phosphate baths, so they cut energy, maintenance and waste-treatment costs. They work on steel, galvanized and aluminum in one bath but demand a very clean surface and DI rinses.
Since we went to thin-film zirc the phosphate sludge is gone, but the cleaner stage has to be perfect now.
Also heard as
- zirc
- zirconium pretreatment
- nano-ceramic
Related terms
Conversion coating
A thin layer formed by chemically reacting the metal surface, which improves adhesion and slows corrosion under powder.
DI rinse
Deionized water rinse, the final stage that washes salts off the part so they do not end up trapped under powder.
Iron phosphate
A thin, amorphous phosphate conversion coating on steel, the economical standard for indoor and light outdoor parts.
Water-break test
Quick cleanliness check: a clean surface holds an unbroken sheet of water, an oily one makes it bead and split.