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公开(公告)号：WO2014006031A1
公开(公告)日：2014-01-09
申请号：PCT/EP2013/063912
申请日：2013-07-02
摘要： The invention relates to a method for forming a passivation layer on a strip of packaging steel for producing a packaging container or a can, said strip having at least one tinplated surface having excellent sulphide staining resistance. The method comprises the steps of: (i) subjecting said tin-plated surface to an anodic treatment at a pH of from 8 to 12 in a suitable aqueous electrolyte, wherein the suitable electrolyte is a phosphate solution, borate solution, sulphate solution or a carbonate solution, wherein the electrolyte for the anodic treatment does not contain mono-atomic halogen anions (Group 17) such as CI-, F-, wherein the thickness of the tin oxide layer (D), expressed in Coulomb/m2 and representing the total charge needed to reduce the layer to metallic tin is related to anodic treatment time (t), current density (A) by D = E x A x t, where E is the efficiency of the electrochemical reaction, and wherein D is at least 30 C/m2; wherein the electrolyte comprises monoatomic cations from Group 1 or 2 from the periodic table or polyatomic cations, and polyatomic anions; (ii) optionally rinsing and drying the anodically treated tin-plated surface - subjecting the anodically treated tin-plated surface to a chemical passivation treatment free from using hexavalent chromium compounds; (iii) drying of the passivated anodically treated tin-plated surface; (iv) final processing such as oiling, winding, cutting etc.
摘要翻译： 本发明涉及一种用于在包装用钢带上形成钝化层的方法，用于生产包装容器或罐，所述带具有至少一个具有优异的耐硫化物耐污染性的镀锡表面。 该方法包括以下步骤：（i）在合适的含水电解质中使所述镀锡表面经受8-12的pH值的阳极处理，其中合适的电解质是磷酸盐溶液，硼酸盐溶液，硫酸盐溶液或 碳酸盐溶液，其中用于阳极处理的电解质不含有单原子卤素阴离子（第17族），例如Cl-，F-，其中氧化锡层（D）的厚度以C / L表示，代表 将层减少到金属锡所需的总电荷与阳极处理时间（t），电流密度（A）D = E x A xt有关，其中E是电化学反应的效率，其中D为至少30 C /平方米; 其中电解质包括来自元素周期表第1或2族的单原子阳离子或多原子阳离子和多原子阴离子; （ii）任选地冲洗和干燥阳极处理的镀锡表面 - 对阳极处理的镀锡表面进行化学钝化处理，不使用六价铬化合物; （iii）钝化阳极处理镀锡表面的干燥; （iv）上油，卷绕，切割等最终加工
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