Precleaning – Prior to phosphating, parts must be free of all grease, rust, soil, and loose scale. Cleaned parts must be water-break-free after rinsing with clean cold water.
Phosphating – The PHOSPHAT Z-101 is used diluted with water as follows:
- For spray application: 2-3% at a temperature of 140-180°F for 1-2 minutes.
- For dipping: 8-10% at a temperature of 140-180°F for 5-10 minutes.
- The bath should be tested and adjusted to operational limits.
- Thickness of phosphate layer: 2-10 μm, depending on contact time.
Rinse: The phosphating parts are to be immediately rinsed in cold or lukewarm clean, overflowing water bath, for not less than 60 seconds.
Inhibitive Rinse – HIB is a chromate rinse aid. For best results a clean, fresh water rinse should follow the HIB rinse. This can be done by adding HIB to the rinse immediately, following the phosphate bath and use clean, hot water in the final rinse.
HIB is used 2-3 o /oo in hot water to provide post rust inhibition. Maintain the pH of HIB at pH of 3.0 – 4.0 by additions of small amounts of phosphoric acid. Drain tank and recharge daily.
If a non-chromate type inhibitive rinse is required because of government restrictions use HIBI SEAL-NC 2-5 o /oo in hot water (140-160ºF) and adjust the pH of the solution to pH 3.0-4.0 by the addition of small amounts of phosphoric acid. Drain tank and recharge daily.
