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    • 13. 发明授权
    • Process of forming phosphate coatings on metal surfaces
    • 在金属表面形成磷酸盐涂层的方法
    • US5203930A
    • 1993-04-20
    • US570350
    • 1990-08-21
    • Georg BlumlhuberHorst GehmeckerDieter HauffeLothar KaulThomas NitschkeWerner RauschHardy Wietzoreck
    • Georg BlumlhuberHorst GehmeckerDieter HauffeLothar KaulThomas NitschkeWerner RauschHardy Wietzoreck
    • C23C22/13C23C22/18C23C22/22C23C22/36C23C22/73
    • C23C22/184C23C22/13C23C22/22C23C22/362C23C22/73
    • A process for forming phosphate coatings on metal surfaces is provided which comprises the steps of contacting said metal surface with an Fe(II)-containing phosphating solution comprising0.4 to 30 g/l Zn4 to 30 g/l P.sub.2 O.sub.55 to 50 g/l NO.sub.3up to 10 g/l Fe(II) ; andup to 0.3 g/l (Fe(III)wherein the weight ratio of free P.sub.2 O.sub.5 to total P.sub.2 O.sub.5 is (0.04 to 0.50):1 and, replenishing said phosphating solution with Zn, NO.sub.3 and P.sub.2 O.sub.5 in a weight ratio ofZn:NO.sub. 3 P.sub.2 O.sub.5 =(0.60 to 0.30):(0.2 to 0.4):1.wherein the Fe(II) content is adjusted by oxidation with nitrate or nitrite derived from nitrate optionally employed with an oxygen-containing gas, H.sub.2 O.sub.2 and/or nitrous gases; and rinsing said metal surface with a cascade of at least two aqueous rinsing baths in the opposite direction of travel of said metal surface wherein water having a low salt content or no salt content derived from the phosphating bath is fed to the last rinsing bath and the overflowing water from said rinsing bath is fed to the next preceding rinsing bath and ultimately to the phosphating bath, and wherein the low salt content rinse water derived from the phosphating bath is withdrawn therefrom as a rate effective to permit the addition of phosphate-enriched rinsing water from the cascade of rinsing water to the phosphating bath while maintaining the desired species concentration in said phosphating bath.
    • 提供一种在金属表面上形成磷酸盐涂层的方法,其包括以下步骤:使所述金属表面与含有0.4至30g / l Zn 4至30g / l P 2 O 5的含Fe(II)的磷酸盐溶液接触5至50g / l NO3高达10g / l Fe(II); 和高达0.3g / l(Fe(III),其中游离P 2 O 5与总P 2 O 5的重量比为(0.04-0.50):1,并用Zn,NO 3和P 2 O 5以Zn:Nn的重量比补充所述磷酸盐溶液 3 P 2 O 5 =(0.60〜0.30):(0.2〜0.4):1,其中Fe(II)含量通过硝酸盐或亚硝酸盐氧化而调节,硝酸盐或硝酸盐任选地与含氧气体,H 2 O 2和/或亚硝酸气体 并且在所述金属表面的相反行进方向上用级联的至少两个水性漂洗浴冲洗所述金属表面,其中具有低盐含量或不含有来自磷酸盐的盐含量的水被供给到最后的冲洗浴中, 将来自所述冲洗浴的溢出水进料到下一个先前的漂洗浴并最终送入磷化浴,并且其中从磷化浴中得到的低盐含量的漂洗水从其中提取出来,其速率可以有效地添加富含磷酸盐 从级联漂洗水 e向磷化浴中冲洗水,同时保持所述磷化浴中所需的物质浓度。