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Zinc phosphating for fasteners
(-----) February 20, 2008
Dear Sir ,
We are zinc phosphating the fasteners with process Degreasing (Alkaline ,10 min , 90 deg.C)-->Water Rinse-->HCl Pickling (As such , 10 min) --> Water rinse -->Surface Conditioner (Titanium salt , 1 min) --> Phosphating (zinc phosphate , 15 min , 85 deg.C)-->Water rinse -->Passivation--> Centrifuge drying-->Oiling -->Centrifuge drying --> Packing
We need to achieve 96 hrs of salt spray resistance as per ASTM B 117. We want to achieve salt spray resistance by avoiding Hydrochloric acid pickling.
Can you suggest any proceas modification or the kind of chemicals we need to use.
Plating Shop Employee - Mumbai, Maharashtra, India
February 20, 2008
Critical fasteners are often mechanically blast cleaned rather than acid activated, but this may be cost-prohibitive depending on what kind of fasteners you are dealing with.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
March 19, 2008
- Pre-clean parts before DEGREASING
- SUPER-WASH parts after degreasing (use hot water and blow them with air - repeast this step).
- PICKLING time is kind of high (try 2 min)
- Write notes to find the best conditions (above)
- KEYWORD Washing parts very well.
- Minneapolis, MN, USA