公开(公告)号：US06168674A

公开(公告)日：2001-01-02

申请号：US09468282

申请日：1999-12-20

申请人： Horst Gehmecker ,  Thomas Kolberg ,  R{umlaut over (u)}diger Rein

发明人： Horst Gehmecker ,  Thomas Kolberg ,  R{umlaut over (u)}diger Rein

IPC分类号： C23C2207

CPC分类号： C23C22/17 ,  C23C22/182

摘要： In a process of phosphatizing metal surfaces, which at least partly consist of iron or steel, in accordance with the low-zinc technology, the metal surfaces are brought in contact with aqueous acid phosphatizing solutions at a temperature of 30 to 65° C. for a period of 1 to 8 min, which solutions contain 0.4 to 2.0 g/l Zn 7 to 25 g/l P2O5 0.005 to 0.5 g/l peroxide (calc. as H2O2) 0.01 to 10 g/l formate (calc. as formate ion), are free from chlorate and added nitrite, and in which the weight ratio of free P2O5 to total P2O5 has been adjusted to a value in the range from 0.03 to 0.20, and the content of free acid has been adjusted to a value in the range from 0.5 to 2.5. After contact with the phosphatizing solution, the workpiece is rerinsed with water, which has been adjusted with mineral acid to a pH of from 3.6 to 5.0. The phosphatizing solutions may contain in addition up to 30 g/l nitrate as well as manganese, magnesium, calcium, lithium, tungstate, vanadate, molybdate or combinations thereof, possibly also nickel and/or cobalt, each in an amount of up to 3 g/l, possibly also up to 0.030 g/l copper. The weight ratios Mn:Zn, Mg:Zn, Ca:Zn and possibly (Ni and/or Co):Zn should each be not more than 2:1.

摘要翻译： 在根据低锌技术将至少部分由铁或钢组成的金属表面磷化的过程中，在30至65℃的温度下使金属表面与酸性磷酸盐水溶液接触， 时间为1至8分钟，该溶液含有0.4至2.0g / l Zn7至25g / l P2O50.005至0.5g / l过氧化物（按H 2 O 2计算）0.01至10g / l甲酸盐（计算为 甲酸根离子）不含氯酸盐和加入的亚硝酸盐，其中游离P 2 O 5与总P 2 O 5的重量比已经调节到0.03至0.20的范围内，并且游离酸的含量已被调节到一个值 在0.5至2.5的范围内。 在与磷酸盐溶液接触后，将工件重新吸收水，该水已经用无机酸调节至3.6至5.0的pH。 磷酸盐溶液还可以含有高达30g / l的硝酸盐以及锰，镁，钙，锂，钨酸盐，钒酸盐，钼酸盐或其组合，可能还含有镍和/或钴，其量最多为3 g / l，也可能达到0.030g / l铜。 重量比Mn：Zn，Mg：Zn，Ca：Zn以及可能的（Ni和/或Co）：Zn应不大于2：1。