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CN101970625A - 用于调节金属工件的摩擦系数的方法 - Google Patents

用于调节金属工件的摩擦系数的方法 Download PDF

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Publication number
CN101970625A
CN101970625A CN2009801087122A CN200980108712A CN101970625A CN 101970625 A CN101970625 A CN 101970625A CN 2009801087122 A CN2009801087122 A CN 2009801087122A CN 200980108712 A CN200980108712 A CN 200980108712A CN 101970625 A CN101970625 A CN 101970625A
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lubricant
workpiece
interface
layer
priming paint
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CN101970625B (zh
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格哈德·罗伊斯曼
托马斯·克鲁泽
海克·默滕斯
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Ewald Doerken AG
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Ewald Doerken AG
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Abstract

本发明涉及一种用于通过一层或多层涂层的涂覆和硬化来调节金属工件的表面的摩擦系数的方法,所述涂层具有面向所述工件的界面和远离所述工件的界面,其中一层一层地涂覆分别具有至少一层粘合剂和金属颗粒的一层或多层底漆,并且所述底漆中的至少一层具有至少一种润滑剂。为了提出用于在抗腐蚀涂层中更有效地使用润滑剂的可能性,提出通过润滑剂浓度和/或润滑剂成分来调节所述摩擦系数,所述润滑剂浓度和/或润滑剂成分在面向所述工件的所述界面上与在远离所述工件的所述界面上不同。

Description

用于调节金属工件的摩擦系数的方法
技术领域
本发明涉及一种用于调节金属工件的摩擦系数的方法。
背景技术
为了提高暴露在湿气中的金属工件的使用寿命,腐蚀保护涂层是必要的。除了用合适的金属(例如锌)组成的封闭的金属层进行涂层外,——通常通过电镀——,用腐蚀保护剂进行涂层也是腐蚀保护的变形方案,所述腐蚀保护剂以液态的形势涂覆在工件上。这样的腐蚀保护剂通常除了粘合剂和溶剂外还含有金属颗粒。在腐蚀保护剂涂覆在工件上以后,粘合剂在温度的作用下硬化,并且在粘合剂中的金属颗粒形成在金属基质上或多或少延伸的保护层。
在本发明的范围内,如上所述的包括粘合剂和金属颗粒的腐蚀保护剂被称为底漆。在这里,该名称既用于液体的腐蚀保护剂,也用于涂层,所述涂层通过至少一层这样的腐蚀保护剂的涂覆和需要时的硬化来形成。
对于底漆而言,由金属组成的颗粒是尤其重要的,所述颗粒一方面提供阳极的腐蚀保护,因为它们在氧化时覆有耐气候的保护层,但是另一方面也通过金属基质的暴露的部分提供阴极的腐蚀保护,因为它们与基质相比更不贵重,并且因此起到用于该基质的牺牲阳极的作用。对于两种类型,通过金属颗粒尽可能完整地覆盖基质是值得期望的,对于阴极的腐蚀保护而言,也需要金属颗粒的相互接触和与基质的接触,因为只是与基质电接触的这样的金属颗粒能够起到牺牲阳极的作用。
粘合剂也能够用于腐蚀保护,但是与通过金属颗粒的主动的腐蚀保护相反,该腐蚀保护是被动式的,也就是说通过扩散中断层最大程度地阻止金属基质的腐蚀影响。
如果除了腐蚀保护外,希望确定的表面性质那么为此常常使用涂覆在底漆上的面层。后者常常不含有金属颗粒,并且如果含有金属颗粒,那么是为了影响外观,而不是为了主动的阴极或阳极的腐蚀保护。对于确定的应用,例如用于螺纹件,在面层中添加用于调节摩擦系数的润滑剂。
特别是在以浸渍离心法涂层的大量生产的小零件中,通常需要两层底漆,因为只有这样才能使由于应用工艺而产生的接触位置平坦。因此在商业上,在大量生产的小零件中通常使用具有两层腐蚀保护底漆层和一层或两层面层的系统来调节摩擦学特性。
也可能的是,润滑剂结合在底漆中。从而节省时间和成本,因为不必使用分开的面层来调节摩擦系数。
但是产生的缺点是,为了调节在表面上的希望的摩擦系数,必须在通常大量着色的底漆中添加相当多的润滑剂。因此,尤其是在如聚四氟乙烯(PTFE)的价格高的润滑剂中产生高的成本。
发明内容
因此,本发明的目的在于,提出一种用于在抗腐蚀涂层中有效地使用润滑剂的可能性。
根据本发明,该目的通过如权利要求1的用于调节金属工件的摩擦系数的方法以及通过如权利要求14的金属工件得以实现。
在根据本发明的用于调节金属工件的表面的摩擦系数的方法中,一层或多层涂层涂覆在工件上并且硬化。为此,一层一层地涂覆分别具有至少一层粘合剂和金属颗粒的一层或多层底漆。使用的底漆中的至少一层具有至少一种润滑剂。如果涂层的特征在于面向工件的界面和远离工件的界面,那么根据本发明,通过润滑剂浓度和/或润滑剂成分来调节摩擦系数,所述润滑剂浓度和/或润滑剂成分在面向工件的界面上与在远离工件的界面上不同。
在这种情况下,本发明基于如下认识,有针对性地且可选择地在由一层或多层底漆构成的涂层中使用润滑剂是可能的,所述涂层可调节工件的所希望的摩擦学特性。
在根据本发明的方法中能够一层一层地涂覆一层或多层底漆,所述底漆包括在浓度和/或成分上不同的润滑剂,这也包含如下可能性,至少一层底漆(但是不是所有底漆)不包括润滑剂。
本领域技术人员已知,确定的润滑剂,例如如油酸或硬脂酸的脂肪酸,经常在原材料制造时,尤其是在制造用于腐蚀保护剂的金属颗粒时,作为污物带入,而并非有意地作为润滑剂使用。这些材料通常在制造金属颗粒时作为辅助材料使用,并且不可避免地至少作为痕量附着在颗粒上。少量粘稠的腊,如聚乙烯蜡,也能够作为添加剂添加,以便例如调节涂层剂的流变。在本发明的范围内,在某种意义上可无视润滑剂的这样的痕量,使得含有小于1.0%重量百分比的润滑剂的层被称为不具有润滑剂的层。只是当重量比例为所述值或超过所述值时,层才被视为为具有润滑剂的层。
根据本发明的方法允许非常有效地使用润滑剂,尤其是固体的润滑剂。现在例如可能的是,在远离工件的界面附近使用高浓度的润滑剂,在那里这些润滑剂用于调节摩擦系数,而在位于下面的区域内使用少量的润滑剂或不使用润滑剂。因此,润滑剂的使用能够被限制在润滑剂发挥最大作用的区域上。这通常为底漆的远离工件的外部区域。底漆的外表面,也就是说远离工件的界面(或至少部分界面),在使用工件时通常为与其它工件的接触面,即例如在螺钉和螺母之间接触位置。这表明,尤其是通过在这些界面的区域内的润滑剂浓度来确定摩擦系数。因此,根据本发明也能够使用比在根据现有技术的方法中更少的润滑剂。因此,鉴于大量的待涂层的零件,尤其是在大量生产的小零件中,获得十分重要的成本节省。
此外表面,润滑剂经常显著地使腐蚀保护性变差。润滑剂添加物,例如腊,一方面能够阻碍封闭的粘合剂膜的构成,另一方面它们能够置于金属涂料之间或金属涂料上,并且因此阻碍封闭的保护层的构成。因此,带有用于调节摩擦系数的结合的润滑剂的锌屑涂层例如经常具有比不带有润滑剂添加物的类似的涂层少的腐蚀保护。
因为在根据本发明的方法中,能够在底漆内可选择地,尤其是在面向工件的界面上,少量地留有润滑剂浓度,或者在那里不使用润滑剂,所以在那里,封闭的膜能够形成活动的金属颗粒。在那里使用的金属颗粒完全有助于主动的腐蚀保护,因为在尤其是锌颗粒和/或铝颗粒的金属颗粒之间的必要的接触确保没有润滑剂的受阻碍的影响。底漆的这些层,——在所述层内使用润滑剂,尤其是较高浓度的润滑剂——,但是基于含有的金属颗粒也有助于主动的腐蚀保护。这与根据现有技术的方法相比是十分重要的优点,在所述方法中,只是在不含有用于腐蚀保护的金属颗粒的面层中含有润滑剂。通过根据本发明的方法,获得具有可限定地调节的摩擦系数的稳定的有效的腐蚀保护涂层,在至今为止已知的涂层上要考虑所述摩擦系数。
在根据本发明的方法的优选的实施方式中,在保持润滑剂成分的同时,改变润滑剂浓度,使得在远离工件的界面上的该润滑剂浓度比在面向工件的界面上的高。如上所述,在这种情况下例如可设想,在最后所述的界面的区域内少量地存在润滑剂或不存在润滑剂,从而能够通过含有的金属颗粒确保最佳的腐蚀保护。同时,在底漆的外部区域内,即在远离工件的界面附近,能够存在较多润滑剂,以便确保限定的摩擦系数。
在本方法的另一个优选的变形方案中,在使用不同的润滑剂的情况下进行涂层的涂覆,使得在保持润滑剂浓度的同时,在面向工件的界面上的润滑剂成分与在远离工件的界面上的不同。因此,例如能够在具有价格便宜的润滑剂(例如聚乙烯)的底漆上涂覆具有价格高的润滑剂(例如PTFE)的底漆。
因此,与在总的涂层中单独地使用价格高的润滑剂相比,能够节省成本。在上层损坏时,价格便宜的润滑剂的补充使用提供如下优点,通过在位于下面的层中含有的润滑剂在一定程度上保持工件的摩擦学特性,所述润滑剂足够用于多种应用。
在本方法的优选的改进形式中,润滑剂成分包括具有低于170℃,优选低于150℃(在下面称为低熔点的润滑剂)的熔点的润滑剂和具有150℃(在下面称为高熔点的润滑剂),优选170℃或更高的熔点的润滑剂,其中在远离工件的界面上的具有150℃或170℃或更高的熔点的润滑剂的浓度与在面向工件的界面上的不同。例如对于低熔点的润滑剂而言,是聚丙烯(PP)和聚乙烯(PE),例如对于高熔点的润滑剂而言,是PTFE、硫化钼、石墨和氮化硼。如果粘合剂在大约150℃或170℃或更高的温度下硬化,那么在这个热硬化过程期间,低熔点的润滑剂能够熔化,并且需要时也能够借助粘合剂交联。
通常以颗粒状包含在底漆内的确定的高熔点的润滑剂,例如PTFE或改性的PTFE,乙烯三氟氯乙烯共聚物(ECTFE)或聚偏氟乙烯(PVDF),在硬化过程期间温度升高的情况下,表现出“悬浮”形式,也就是说,它们沿远离工件的界面的方向向外移动。在根据本发明的方法的范围内利用这个效果在所述界面的区域内这些润滑剂调到较高的浓度。
根据本发明的方法的变形方案可能性是多种多样的。也可设想润滑剂浓度和润滑剂成分的组合的变形方案,使得前者和后者在远离工件的界面上与在面向工件的界面上不同。因此,根据本发明的底漆例如能够在工件附近含有20%重量百分比的PE,而其在远离工件的界面上含有10%重量百分比的PVDF。通过这样的组合物能够确保,在底漆表面损坏时保持基本上没有变化的摩擦系数。
作为润滑剂能够考虑由现有技术已知的所有的材料,因此例如卤素碳氢化合物,尤其是聚四氟乙烯(PTFE)、聚偏氟乙烯(PVDF)、四氟乙烯/六氟丙烯共聚物(FEP)、全氟烷氧基共聚物(PFA)、四氟乙烯与全氟化丙烯和全氟烷基乙烯基醚(EPE)的共聚物、由四氟乙烯和全氟甲基乙烯基醚(MFA)组成的共聚物、MoS2、氮化硼、石墨、氟化石墨、棕榈蜡、聚砜、聚烯烃树脂,尤其是聚乙烯(PE)和聚丙烯(PP)、它们的混合物或其组合物。在这种情况下,如上所述,也可能的是,使用一层一层的不同的润滑剂。
使用的金属颗粒能够为不同的种类。这些种类能够由锌、铝、锡、镁、镍、钴、锰、钛或它们的合金组成。也可设想,将不同金属或合金的颗粒混合。颗粒能够以薄片、颗粒、粉末形式或其组合的形式存在。金属颗粒的特别优选的种类是锌薄片或锌合金薄片。
在根据本发明的方法中能够使用具有从现有技术中已知的不同的粘合剂的底漆。粘合剂的重要的基团是硅烷,尤其是有机官能化硅烷,例如γ-缩水甘油醚氧基丙基三甲氧基硅烷。除了硅烷外,硅氧烷也是适合的,例如甲氧基聚硅氧烷或硅酸盐(酯),例如碱金属硅酸盐或烷基硅酸盐(酯)。尤其能够使用与胺固化剂(需要时氨基硅烷)结合的所述的粘合剂。
此外能够考虑基于钛酸盐(酯)的粘合剂。这些粘合剂典型地含有烷基钛酸酯,因此例如如四丁基钛酸酯的单酯,但是也能够是如聚丁基钛酸酯的聚合体。
六价铬化合物也能够作为粘合剂,所述六价铬化合物能够以如铵铬酸盐或碱金属铬酸盐的盐的形式添加。
所述粘合剂在硬化过程期间在水和/或醇的裂解的作用下聚合。因此,尤其是在经硬化的涂层中出现这些粘合剂的聚合产物。所述粘合剂的混合物也是适合的,因此例如硅烷和钛酸盐(酯)的粘合剂,所述硅烷和钛酸盐(酯)在这种情况下能够形成共同的聚合物。
此外,在根据本发明的方法中能够使用有机粘合剂,如环氧化物、氨基甲酸乙酯、丙烯酸脂(例如甲基丙烯酸甲酯)和/或作为与上述无机粘合剂结合的有机共聚物的聚酯。
用于根据本发明调节摩擦系数的可能的途径在于,首先将包括粘合剂、金属颗粒和可选地包括润滑剂的第一层底漆,在含水的或有机的阶段一层地或多层地涂覆在工件上。紧接着,将分别包括粘合剂、金属颗粒和可选地包括润滑剂的至少另一层底漆,在含水的或有机的阶段一层一层地涂覆。在这种情况下,——包括第一底漆在内——,使用具有不同的润滑剂浓度和/或润滑剂成分的至少两层底漆。在涂层步骤的每一步之后,进行经涂覆的涂层的热硬化,可替代的是,以唯一的方法步骤使层在其总体上硬化。
在这种情况下,例如能够如下进行:连续地涂覆三层底漆,其中每层底漆除了用于确保足够的腐蚀保护的粘合剂外,还含有金属颗粒。涂覆不含有润滑剂的第一层底漆。然后接着涂覆包括作为润滑剂的硫化钼的另一层底漆。最后涂覆含有作为辅粘合剂的PTFE的第三层底漆,然后进行三层底漆的热硬化。
如从现有技术中已知,除了所述成分外,能够在各层底漆中添加另外的附加材料,如粘稠剂、去泡剂、浸润剂、表面活性剂、填充材料或颜料。
如从现有技术中已知,在根据本发明的方法中优选的是,在涂覆涂层之前预处理工件。在这种情况下,可能的处理方法为清洗、去油脂、酸洗、喷砂、压缩空气喷射和/或磷化。
在本发明的改进方案中提出,在一层或多层涂层上涂覆传统的一层或多层面层。在本文中每个包括粘合剂,但不包括用于主动的腐蚀保护的金属涂料的涂层称为面层,也就是说,在“面层”和“涂漆层”之间没有区别。如从现有技术中已知,面层能够可选地含有润滑剂。也存在的可能性是,面层除了本领域技术人员已知的颜料和成分外,还含有用于产生“金属感”的一定量的金属颗粒。
具体实施方式
下面借助于实施例阐述本发明的工作原理。
实施例1
为了给钢质螺钉涂层,准备具有底漆A、B和C的三个池。每个池如下制成。
29.2%重量百分比的脱离子水在适度搅拌的情况下与4.6%重量百分比的γ-缩水甘油醚氧基丙基三甲氧基硅烷和0.9%重量百分比的硼酸混合。在搅拌3小时后,向混合物中添加另外的45.1%重量百分比的脱离子水和湿润剂混合剂,其含有在20/20℃下摩尔质量为395的2.3%重量百分比的乙氧化的无离子壬基酚(“NENN”)以及在20/20℃下摩尔质量为616且比重为1057的2.3%重量百分比的NENN。然后向该混合物中添加另外的3.1%重量百分比的所述硅烷、6.3%重量百分比的丙酮和1.1%重量百分比的硝基丙烷。为此,以根据池而不同的重量比例添加锌糊和粉末状的PTFE。絮状形式的锌具有大约0.1至0.5μm的颗粒厚度和各个颗粒的大约80μm的最长拉伸。紧接着将使用的材料在科勒斯高速分散机(Cowles-Dissolver)中充分混合3小时,所述科勒斯高速分散机以大约每分钟960转进行工作。然后,在继续搅拌1小时期间,向由此得到的混合物中添加0.6%重量百分比的双十三烷基磺酸钠(阴离子湿润剂),并且继续混合大约12小时。在由此获得的涂层剂时效6天后,在搅拌的情况下添加另外的4.5%重量百分比的γ-缩水甘油醚氧基丙基三甲氧基硅烷。
锌糊和PTFE的重量比例选择为,使得(相对于100%重量百分比的制成的底漆)
池A含有35%重量百分比的锌糊并且不含有PTFE;
-池B含有35%重量百分比的锌糊以及1%重量百分比的PTFE;
-池C含有35%重量百分比的锌糊以及3%重量百分比的PTFE。
钢质螺钉在由水组成的清洗溶液中,——在所述水中,每1升水溶解有9g磷酸钾和27g氢氧化钾——,在75℃下去油脂,并且紧接着用自来水清洗。再次重复去油脂和清洗过程,并且紧接着使螺钉变干燥。
为了涂层,将螺钉置于浸入池A内的金属丝篮中。紧接着从池中提起篮子,并且将剩余的底漆以每分钟300转在两个离心过程内各离心10小时。
然后从篮中取出螺钉,并且将粘合剂在炉中在70℃下预干燥10分钟,并且紧接着在320℃下硬化30分钟。
在第一层硬化后,将螺钉浸入池B的第二金属丝篮中。紧接着重复所述的离心过程和硬化过程。
最后,在池C中重复具有底漆的涂层过程、离心过程和硬化过程。
因此获得具有大约30μm的厚度的极其薄的涂层,所述涂层一方面具有非常好的腐蚀保护性质,另一方面允许精确地调节摩擦系数。
实施例2
为了给钢质螺钉的涂层,准备具有底漆的三个池D、E和F。为每层底漆制备具有如下成分的粘合剂。
-三甲氧基乙烯基硅烷:9.8%重量百分比;
-乙基己醇钛(四-2-乙基-己基钛酸盐):24.9%重量百分比;
-正丁基聚钛酸盐(四丁醇钛聚合物):36.8%重量百分比;
-醇:14.5%重量百分比,以及
-抗沉淀剂:总共11.4%重量百分比。使用不同的抗沉淀剂,在这里:2.6%重量百分比的无定形硅酸、3.1%重量百分比涂料添加剂Y25SN(Ashland公司)和Ewald
Figure BPA00001221973800091
AG公司的5.7%重量百分比的在醇中占11%的Ethocell 45溶液,以及
-湿润和分散添加剂:2.6%重量百分比的在无定形芳香碳氢化合物中占20%的Disperbyk 160溶液(
Figure BPA00001221973800092
公司);
-总和:相对于粘合剂100%重量百分比。
为了调节腐蚀保护性质,使用具有大约4μm的锌颗粒的平均直径的锌糊(锌糊:将90%重量百分比的锌粉末与10%重量百分比的有机溶剂制备成糊)以及铝糊的混合剂。在这种情况下,锌糊:铝糊的重量比例为55∶2。除了金属颗粒糊外,也可选地在粘合剂中添加润滑剂,其中重量比例根据底漆改变,如下所述。
每个底漆在可冷却和可加热的制备容器中借助可无级调节的集成的搅拌工具制备。上述用于粘合剂的成分以及金属糊和润滑剂以给定的顺序在计量容器中在搅拌的情况下连续地混合。温度在+5℃和+60℃之间。搅拌工具调节到每分钟1000转,并且在添加相应地成分后混合5分钟。
金属糊和润滑剂的重量比例选择为,使得分别相对于100%重量百分比的底漆
-池D含有57%重量百分比的糊并且不含有润滑剂;
-池E含有57%重量百分比的糊和5%重量百分比的聚乙烯;以及
-池F含有57%重量百分比的糊和2%重量百分比的PTFE。
类似实施例1,钢质螺钉连续地在三个池中进行涂层。在这种情况下,在200℃的目标温度下,分别在30分钟内进行各个层的硬化。
获得具有优秀的腐蚀保护性质的涂层,其中通过具有PTFE的位于外部的层精确地调节摩擦系数。由于存在具有聚乙烯的中间层,在外层损坏时也足以确保限定的摩擦学特性。

Claims (14)

1.一种用于通过一层或多层涂层的涂覆和硬化来调节金属工件的表面的摩擦系数的方法,所述涂层具有面向所述工件的界面和远离所述工件的界面,其中一层一层地涂覆分别具有至少一层粘合剂和金属颗粒的一层或多层底漆,并且所述底漆中的至少一层具有至少一种润滑剂,
其特征在于,通过润滑剂浓度和/或润滑剂成分来调节所述摩擦系数,所述润滑剂浓度和/或润滑剂成分在面向所述工件的所述界面上与在远离所述工件的所述界面上不同。
2.如权利要求1所述的方法,其特征在于,在保持润滑剂成分的同时,所述润滑剂浓度在远离所述工件的所述界面上比在面向所述工件的所述界面上的高。
3.如权利要求1所述的方法,其特征在于,在保持润滑剂浓度的同时,在面向所述工件的所述界面上的所述润滑剂成分与在远离所述工件的所述界面上的所述润滑剂成分不同。
4.如权利要求1所述的方法,其特征在于,在远离所述工件的所述界面上的所述润滑剂浓度和所述润滑剂成分与在面向所述工件的所述界面上的所述润滑剂浓度和所述润滑剂成分不同。
5.如前述权利要求中至少一项所述的方法,其特征在于,所述润滑剂成分包括具有低于150℃的熔点的润滑剂和具有150℃或更高的熔点的润滑剂,其中在远离所述工件的所述界面上的具有150℃或更高的熔点的润滑剂的浓度与在面向所述工件的所述界面上的不同。
6.如权利要求5所述的方法,其特征在于,在远离所述工件的所述界面上的具有150℃或更高的熔点的润滑剂的浓度比在面向所述工件的所述界面上的高。
7.如权利要求5或6所述的方法,其特征在于,在远离所述工件的所述界面上的具有直至150℃,优选直至170℃的熔点的润滑剂的浓度比在面向所述工件的所述界面上的高。
8.如前述权利要求中至少一项所述的方法,其特征在于,所述至少一种润滑剂选自如下组,所述组包括:卤素碳氢化合物,尤其是聚四氟乙烯(PTFE)、聚偏氟乙烯(PVDF)、四氟乙烯/六氟丙烯共聚物(FEP)、全氟烷氧基共聚物(PFA)、四氟乙烯与全氟化丙烯和全氟烷基乙烯基醚(EPE)的共聚物、由四氟乙烯和全氟甲基乙烯基醚(MFA)组成的共聚物、MoS2、氮化硼、石墨、氟化石墨、棕榈蜡、聚砜、聚烯烃树脂,尤其是聚乙烯(PE)和聚丙烯(PP)、它们的混合物或其组合物。
9.如前述权利要求中至少一项所述的方法,其特征在于,所述金属颗粒选自如下组,所述组包括:锌、铝、锡、镁、镍、钴、锰、钛或它们的混合物和合金,并且具有薄片、颗粒或粉末形式,或者其的组合的形式。
10.如前述权利要求中至少一项所述的方法,其特征在于,所述粘合剂选自如下组,所述组包括:硅烷、硅氧烷、硅酸盐(酯)、钛酸盐(酯)和六价铬化合物、它们的混合物或聚合产物,或者它们的有机共聚物,所述有机共聚物具有环氧化物、氨基甲酸乙酯、丙烯酸脂或聚酯或其组合物。
11.如前述权利要求中至少一项所述的方法,具有如下步骤:
-将包括粘合剂、金属颗粒和可选地包括润滑剂的第一层底漆,在含水的或有机的阶段一层地或多层地涂覆在所述工件上;
-紧接着,将分别包括粘合剂、金属颗粒和可选地包括润滑剂的至少另一层底漆,在含水的或有机的阶段一层一层地涂覆;
其中使用具有不同的润滑剂浓度和/或润滑剂成分的至少两层底漆。
12.如前述权利要求中至少一项所述的方法,其特征在于,在涂覆所述涂层之前预处理所述工件,尤其清洗、去油脂、喷砂、压缩空气喷射、磷化、涂底漆或者配备附着剂。
13.如前述权利要求中至少一项所述的方法,其特征在于,在涂覆所述涂层后,涂覆一层或多层面层。
14.一种具有金属表面的工件,具有由一层或多层底漆组成的一层或多层涂层,其中与面向所述工件的所述界面相比,在面向所述工件的所述界面上提供不同的润滑剂成分和/或不同的润滑剂浓度。
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