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Title: Post-treatment of conversion-coated metal surfaces

Abstract: Disclosed is a process for the post-treatment of conversion-coated metal surfaces. The aqueous treating solution contains a melamine-formaldehyde resin and preferably contains a vegetable tannin and is free of chromium. Treatment with the melamine-formaldehyde resin-containing solution provides improved corrosion-resistance over that obtained with a water rinse and treatment with the melamine-formaldehyde resin and vegetable tannin combination solution gives corrosion results as measured by salt spray resistance comparable to those obtained with the use of the commercial dilute chromium-containing rinse.


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Inventors: Kulick, Leonard (Ferndale, MI, US)
Howell, Jr., John K. (Rochester, MI, US)

Application Number: 631787
Filing Date: 1975-11-13
Publication_date: 1977-08-02
Assignee: Oxy Metal Industries Corporation (Warren, MI)
Primary Class(es): 148/257 148/265, 524/72, 524/597
Other Classes:
US Patent Ref:
1303627May, 1919Baines148/6.
2854368Sep, 1958Shreir148/6.
3877998Apr, 1975Guhde148/6.

Other Refs: 1,192,487
May, 1965DT

Primary Examiner: Kendall, Ralph S.
Assistant Examiner:
Attorney: Kluegel; Arthur E., Claeboe; Bertram F., Mueller; Richard P.