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    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

    Inventor： HELLER FERDINAND PHILLIP ,  KUEHNER MARK ALLEN ,  STEINBRECHER LESTER

    IPC: C23C22/36 ,  C23F7/10 ,  C23F7/12 ,  C23F7/14

    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.

    8.
    发明专利
    未知

    公开(公告)号：AT301980B

    公开(公告)日：1972-09-25

    申请号：AT968966

    申请日：1966-10-17

    Applicant: AMCHEM PROD

    Inventor： DOUTY ALFRED ,  HELLER FERDINAND PHILIP ,  STEINBRECHER LESTER

    IPC: C23C22/14 ,  C23F7/08

    Abstract: Phosphate coatings are produced on iron, steel and/or zinc (including galvanized) surfaces by contacting them, e.g. by spraying at 38-60 DEG C., with a chlorate-accelerated zinc phosphate coating solution, e.g. prepared by dissolving ZnO and preferably NiO in H3 PO4 and adding water and NaClO3, in which nitrite is added, e.g. as NaNO2 or HNO2, to establish and maintain a concenration of 0.03 to 1.0 g/l NO2 to eliminate build-up of ferrous ion. The solution may also contain Cu and nitrate.

    10.
    发明专利
    未知

    公开(公告)号：DE1274418B

    公开(公告)日：1968-08-01

    申请号：DEA0050014

    申请日：1965-08-17

    Applicant: AMCHEM PROD

    Inventor： STEINBRECHER LESTER ,  BUCZKOWSKI DWIGHT EDWARD ,  HARRISON JAMES WENDELL

    IPC: C23C22/77 ,  G05D21/02

    Abstract: In producing phosphate coatings upon a succession of ferrous metal surfaces by contacting them with a nitrite-containing aqueous acidic zinc phosphate solution, the solution is replenished with nitrite ion at a rate governed by the potential measured across a pair of redox electrodes immersed in the solution while contact is maintained between the solution and the surfaces. The solution may also contain calcium phosphate, oxidizing accelerator such as nitrate, non-oxidizing accelerators such as Cu, Ag, Ni and/or Co as well as simple and complex fluorides and salts of polyphosphoric acids. Replenishment with nitrite ion is initiated when the measured potential falls to a pre-selected value and is subsequently discontinued either a) when the measured potential rises above a higher pre-selected value or b) after a pre-selected time interval. Replenishment may be prevented during a further pre-selected time interval occurring immediately after the replenishing time interval. The redox electrodes may comprise a calomel and a Pt electrode. Alternatively Au-calomel or C-calomel systems may be used. The inert one of the pair of redox electrodes may be periodically cleaned by first rendering it anodic relative to a second inert electrode positioned adjacent thereto and subsequently rendering it cathodic relative to the second inert electrode. Fig.1 (not shown) illustrates a line wherein car parts are spray-treated as they are conveyed through a tunnel (4). They are cleaned with an aqueous solution of Na3PO4 or Na2CO3 (at 5), water rinsed (at 6 and 7), phosphate conversion coated (at 8), water rinsed (at 9), acid rinsed (at 10) e.g. with chromic acid to stabilize and passivate the conversion coating and oven dried (at 3) prior to painting. Fig. 2 (not shown) illustrates the spraying of workpieces (19, 20) with the phosphate solution as they move along a conveyer (1) circulation of the solution and addition of phosphate and replenishing NaNO2 from drums (28, 33) to the circulating solution. Fig. 3 (not shown) illustrates calomel and Pt redox electrodes (40, 41) triggering operation of a time switch (T1 or T2) to control a motor (32) which drives a pump (31) to deliver nitrite solution from a drum (33) to the phosphate solution. Switching mechanism controls cleaning of the electrode (41) with the aid of an auxiliary Pt electrode (42).

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