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    • 6. 发明公开
    • A process for phosphate-coating metal surfaces
    • Verfahren zur Phosphatierung vonMetalloberflächen。
    • EP0544650A1
    • 1993-06-02
    • EP93200125.8
    • 1986-08-27
    • HENKEL CORPORATION (a Delaware Corp.)
    • Miyamoto SatoshiNagatani, Masamichi
    • C23C22/36
    • C23C22/364C23C22/365
    • A process for phosphating a metal surface, particularly to avoid white spots, involving treating the metal surface with an acidic aqueous phosphate solution in which one establishes and maintains a concentration of at most 0.2 g/l and preferably no chlorate ion as well as the smallest practical concentration never exceeding 0.5 g/l of chloride ion, the solution otherwise containing:

      a) from 0.1 to 1.5 g/l of zinc ion,
      b) from 5 to 50 g/l of phosphate ion,
      c) from at least 0.2 to 4 g/l of manganese ion,
      d) at least 0.05 g/l of a fluoride ion, and
      e) at least one of the following phosphating accelerators in the following concentrations:

      i) from 0.01 to 0.2 g/l of nitrite ion,
      ii) from 1 to 15 g/l of nitrate ion,
      iii) from 0.5 to 5 g/l of hydrogen peroxide (based on 100% H₂O₂),
      iv) from 0.05 to 2 g/l of m-nitro-benzene-sulfonate ion,
      v) from 0.05 to 2 g/l of m-nitro-benzoate ion, and
      vi) from 0.05 to 2 g/l of p-nitrophenol.
    • 一种磷酸化金属表面的方法,特别是为了避免白点,涉及用酸性磷酸盐水溶液处理金属表面,其中一种建立并保持至多0.2g / l的浓度,优选不含氯酸根离子 实际浓度不超过0.5g / l氯离子,溶液另外含有:a)0.1〜1.5g / l的锌离子,b)5〜50g / l的磷酸根离子,c)为0.2〜 4g / l的锰离子,d)至少0.05g / l的氟离子,以及e)以下浓度的至少一种以下磷酸化促进剂:i)0.01至0.2g / l的亚硝酸根离子, ii)1至15g / l硝酸根离子,iii)0.5至5g / l过氧化氢(基于100%H 2 O 2),iv)0.05至2g / l间硝基苯磺酸盐 离子,v)0.05-2g / l间硝基苯甲酸根离子,和vi)0.05-2g / l对硝基苯酚。 Ø