Alkaline resistant phosphate conversion coatings

Stock material or miscellaneous articles – Composite – Of metal

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

148 615Z, 106 1412, C23C 206

Patent

active

047131217

ABSTRACT:
A method for increasing the resistance to alkaline dissolution of a phosphate conversion coating on a corrodible metal surface by an improved zinc phosphate conversion coating together with articles coated by this method are disclosed. The substrate is exposed to the phosphating solution by spraying or immersion to chemically effect a reaction with the substrate. First divalent metal cations are selected from magnesium and transition metals having a hydroxide with lower solubility in alkaline solution than zinc hydroxide. The other source of necessary metal cations is zinc and its cations are herein termed second divalent metal cations. In the preferred embodiment, the first divalent metal cations comprise about 84 to about 94 mole percent of the total first and second divalent metal cations in the bath. The deposited coating has first divalent metal cations (chemically combined with phosphate ions) present in an amount of at least 15 mole percent of the total first and second divalent metal cations in the coating.

REFERENCES:
patent: 2554139 (1951-05-01), Drysdale
patent: 3810792 (1974-05-01), Ries

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Alkaline resistant phosphate conversion coatings does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Alkaline resistant phosphate conversion coatings, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alkaline resistant phosphate conversion coatings will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1218074

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.