Phosphate conversion coating of aluminum, zinc or iron
    4.
    发明授权
    Phosphate conversion coating of aluminum, zinc or iron 失效
    铝,锌或铁的磷酸盐转化涂层

    公开(公告)号:US3619300A

    公开(公告)日:1971-11-09

    申请号:US3619300D

    申请日:1968-11-13

    Applicant: AMCHEM PROD

    CPC classification number: C23C22/36

    Abstract: A zinc phosphate coating process for coating a metal surface consisting of aluminum, iron or zinc or alloys of aluminum, iron or zinc which comprises treating said metal surface with an aqueous solution containing as its essential ingredients, (a) at least about 0.7 gram per liter of zinc ion, (b) at least 1 gram per liter of phosphate ion 3as PO4), (c) at least about 1 gram per liter of nitrate ion (calculated as NO3), (d) between about 0.006 gram per liter and about 1 gram per liter of nitrite ion (calculated as NO2), (e) between about 0.025 gram per liter and about 2.5 grams per liter of fluoride added as a combination of fluorides and bifluorides of sodium and potassium, such that the molar ratio of potassium to sodium is about 2:1 and the ratio of fluoride to bifluoride is about 1:1.

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