CN102449193A - 用于制造扁钢制品的方法以及扁钢制品 - Google Patents

用于制造扁钢制品的方法以及扁钢制品 Download PDF

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CN102449193A
CN102449193A CN2010800230342A CN201080023034A CN102449193A CN 102449193 A CN102449193 A CN 102449193A CN 2010800230342 A CN2010800230342 A CN 2010800230342A CN 201080023034 A CN201080023034 A CN 201080023034A CN 102449193 A CN102449193 A CN 102449193A
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coating
layer
zinc
basal layer
coated
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贝恩德·舒马赫尔
克里斯蒂安·施韦尔特
妮科尔·魏厄
理查德·温霍尔德
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ThyssenKrupp Steel Europe AG
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    • BPERFORMING OPERATIONS; TRANSPORTING
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    • Y10T428/12729Group IIA metal-base component
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Abstract

本发明涉及一种用于制造扁钢制品的方法和一种扁钢制品,该扁钢制品由基础层和涂覆在基础层上的、防腐蚀的、具有多层结构的涂层构成,基础层由钢材料构成,所述方法包括以下步骤:准备基础层;通过电镀的方式在基础层上涂覆锌镀层;在锌镀层的表面上涂覆最大为25nm厚的铝镀层,其中,锌镀层表面鉴于在其表面上的氧化物和硫化物根据加工方式存在于电镀锌的一端,或保持在进入到铝镀层的过程状态中;在铝镀层上涂覆镁镀层;以及,对这样的扁钢制品进行后续热处理,该扁钢制品具有由涂覆在基础层上的锌镀层、铝镀层和镁镀层构成的涂层,该后续热处理在涂层的表面方向上、于Al镀层上、在涂层中形成MgZn2镀层。

Description

用于制造扁钢制品的方法以及扁钢制品
技术领域
本发明涉及一种用于制造扁钢制品的方法,该扁钢制品由基础层和涂覆在该基础层上的、防腐蚀的、具有多层结构的涂层构成,该基础层由钢材料构成。
本发明还涉及一种扁钢制品,其由基础层和涂覆在该基础层上的具有多层结构的涂层构成,该基础层由钢材料构成。
背景技术
长期以来,为了防止钢板腐蚀而采用金属涂层。对此,除了纯锌涂层或铝涂层之外,近些年来还越来越多采用双元和三元镀层系统。相对于纯锌涂层或铝涂层,这样的镀层系统除了具有优化的防腐性能外,还特别改善了粘附性能、耐磨损性能、焊接性能以及变形性能。
由锌、铝、镁构成的三元合金涂层(可能还混合较少量的硅)通常采用热浸镀层的方式生成。在此,镀层厚度在4-10μm的范围内,实际上在该范围内,对于这样进行镀层的扁钢制品的焊接过程造成困难。特别对于要求零焊缝(Nullfügespalt)的激光焊接来说会造成困难,这方面在具有相对较厚的三元涂层的钢板中已经证实是关键性的。
然而具有较高保护效果的较薄防腐涂层这样制成,即,对于钢基质、即钢带或钢板首先进行电镀锌处理,然后在锌镀层上再涂覆镁镀层。接下来,通过热处理,使镁在锌镀层中形成合金Zn2Mg。对电镀锌的钢板镀镁例如可以借由真空条件的物理气相沉积法(PVD)来实现。
由此获得的基于蒸镀的Mg的电镀锌的钢板的锌镁涂层具有出色的防腐性能,并且显著减小了涂层厚度,涂层厚度的减小特别对于焊接性能产生积极影响。
当然,在ZnMg镀层系统中,实际制造是困难的且耗费工本的,因为在蒸镀镁之前必须使锌表面彻底不含有氧化物颗粒或硫化物颗粒。否则的话,在后续热处理中锌镁镀层会出现较差的粘附性。
对于尽可能不含氧化物和硫化物的表面的要求在实际情况下是相对立的,因为在电镀过程中以及接下来的在工作条件下与外界大气环境相接触的过程中都会产生氧化物和硫化物。因此,在Mg镀层沉积在锌镀层上之前,必须再次将氧化物和硫化物从锌镀层的表面除掉。
适宜的处理方案是,在喷涂之前使Zn表面在真空中进行等离子精洗处理。在此用氩离子对表面进行喷射,从而除去表面的氧化物。在实际情况下,如EP 0 780 485 B1(DE 696 10 064 T2)所述,等离子精洗还可以作为逆向的磁控管喷镀酸洗来实现。
等离子精洗的优势在于其具有相对较好的可操控性。因此,这样的等离子精洗通常应用于所有公知的镀层方法中,公知的镀层方法指的是使金属在真空中沉积在基质上。
然而,考虑到制造扁钢制品的条件,公知的用于等离子精洗的方法由于使用大型机器而具有较高的耗费。因此,一方面需要较高的投资成本用于必要的设备技术。同时,这些设备仅具有较短的停车时间并且需要较短的维修间隔期,这是因为,通过离子喷射而脱落的表面材料会残留在设备中。相应地,必须要在短时间内除掉,从而避免各个待加工的扁管制品被存在于等离子精洗设备中的剩余物污染。
为了回避耗费工本的等离子精洗,在DE 10 2005 045 780 A1中公开了,待镀层的扁钢制品在电镀Zn镀层之后进行级联式冲洗,从而同样能够将Zn镀层表面上的氧化物除掉。接下来,在由此清洗的Zn镀层上沉积Mg镀层,并且以优化的工作参数进行后续热处理。这样确保实现,即使省去等离子精洗处理也能够使ZnMg涂层在钢基质上具有充分的粘附性。然而为此保留的退火的过程窗口要很狭窄,以至于在实际条件下难以保证所要求的精确度。
发明内容
在上述背景情况下,本发明的目的是提供一种方法,在适合实际条件的同时以相对简单的方式使扁钢制品镀上ZnMg涂层,这样的涂层不仅具有良好的粘附性能、防腐性能以及变形性能,而且还能够具有较薄的结构,从而使具有该涂层的扁钢制品还具有良好的焊接性能。
此外,还应该提供一种在适合实际条件的同时还能够低成本制造的扁钢制品,其能够防腐蚀,并且同时具有良好的变形性能和焊接性能。
关于方法,本发明的目的通过权利要求1的方法步骤来实现。本发明方法的具有优势的技术方案在权利要求1的从属权利要求中给出。
关于扁钢制品,本发明的前述目的通过具有权利要求12的技术特征的扁钢制品来实现。本发明制品的具有优势的技术方案在权利要求12的从属权利要求中给出。
根据本发明,扁钢制品由基础层和涂覆在基础层上的、防腐蚀的、具有多层结构的涂层构成,基础层由钢材料构成,这种扁钢制品的制造由以下步骤来实现:
a)准备扁钢制品的由钢材料构成的基础层,其中,该基础层指的是未镀层的钢带或钢板。
b)通过电镀的方式在基础层上涂覆锌镀层。
c)在锌镀层的表面上涂覆最大为25nm厚的铝镀层。在此,除了铝镀层具有很小的厚度之外,本发明的重点还在于,锌镀层表面鉴于在加工环境下其表面上的氧化物和硫化物,而保持到一直存在于电镀锌层处理的结束或将进入到铝镀层处理的状态中。这意味着,将Al镀层直接涂覆在Zn镀层上,而在这之前没有进行特别的清洗处理或除掉镀层上的氧化物或硫化物的预处理。涂覆在Zn镀层上的铝粘接着存在于锌镀层上的Zn氧化物和硫化物。
因此,根据本发明,在涂覆Al镀层之前,在涂有Zn涂层的扁钢制品上既没有进行等离子精洗处理,也没有进行特别的冲洗处理或类似的清理方法。代替这种方式,本发明有意地接受了,在Zn镀层的表面上具有氧化物和/或硫化物,在传统的情况下,这样的氧化物和/或硫化物会阻碍生成充分可靠粘附的防腐层。
由于本发明省去了在锌镀层表面上的除掉氧化物或硫化物的处理,因此相对于公知的视为这种处理是必不可少的方法,本发明的方法明显得到简化。
d)在涂覆铝镀层之后,再在铝镀层上涂覆镁镀层。
e)接下来,对这样涂覆的由Zn镀层、Al镀层和Mg镀层构成的涂层进行后续热处理。为此设定的工作参数不再具有较小的范围,而是仅这样进行调整,从而由于热传入而在涂层的表面方向上、于Al镀层上、在涂层中形成MgZn2镀层。
同样令人惊奇的是,位于Zn镀层和Mg镀层之间的薄的Al镀层使Zn扩散到镁镀层中。同时,Al镀层作为增附剂确保实现了:即使在没有进行等离子精洗处理的情况下、以及没有达到后续热处理的优化温度的情况下、或是没有实现特别用于在涂覆Mg镀层之前而对Zn镀层表面进行冲洗的冲洗条件,本发明的涂层都具有出色的层粘附性能。
对于实现本发明重要的是,Al镀层以这样薄的程度进行涂覆,从而通过该铝镀层仍然能够实现Zn到Mg中的扩散。根据现有技术,虽然Al中间层是公知的,但是在现有技术中却用于防止扩散。例如在火焰镀锌中形成的AlFe中间层,其目的在于防止Zn和Fe的扩散。
与前述本发明的方法相对应地,还提供一种扁钢制品,由基础层和涂覆在所述基础层上的具有多层结构的涂层构成,该基础层由钢材料构成,其中,该涂层包括位于基础层上的Zn镀层、邻近表面的MgZn2扩散层和位于Zn镀层和MgZn2扩散层之间的、最大为25nm厚的Al镀层。本发明的扁钢制品的涂层的MgZn2镀层的厚度通常为400-2500nm,其中,在厚度为400-1000nm的情况下具有最佳的保护效果。
在MgZn2镀层的上方还可以具有一层仅有镁构成的较薄的镀层,该镀层通常仅占据上方的原子层。
因此,本发明含有锌镁涂层,该锌镁涂层这样形成,即,在该锌镁涂层的形成过程中首先于经电镀的钢板上沉积一层较薄的用于改善粘附性能的铝镀层。然后进行涂覆镁镀层,再于镁镀层上进行后续热处理。在后续热处理的范围内,形成一个邻近表面的MgZn2相。在此,厚度小于25nm的较薄的铝镀层用于改善涂层的粘附性能,而不需要为此特别在涂覆Al镀层之前对锌镀层表面进行清洗处理。同理,也省去了在将镁沉淀在Al镀层上之前对Al镀层的清洗处理。
这样提供特别有效的防腐保护,即,在电镀锌的过程中形成完全由高达99.9重量%的高纯Zn构成的Zn镀层。由此可以了解到,在根据本发明构成和实现的涂层中为了充分实现所期望的优化的防腐保护,使电镀沉积的Zn镀层的厚度为2-10μm,其中,当使Zn镀层以小于8μm的厚度涂覆在基础层上时,根据本发明制成的扁钢制品还有利于焊接性能。
根据本发明,当使Al镀层以至少8nm的厚度涂覆在锌镀层上时,涂覆在锌镀层上的铝镀层的有益效果特别这样可靠实现。当铝镀层的厚度为8.5-13nm时,使铝镀层的作用特别优化。
作为用于薄的Al镀层的沉淀方法,适宜采用阴极溅射法、特别是磁控管喷镀法。独立于具体采用的镀层方法,本发明相对于现有技术的优势还在于,涂覆的Al与扁钢制品都不依赖于设备。与在必须采用等离子精洗(用于确保实现ZnMg涂层的充分粘附性能)而造成材料脱落的方法相比,在本发明的方法中,既没有因为除去氧化物、也没有因为金属再液化而危害加工结果。换言之,本发明的用于生成Al镀层的设备可以无干扰和无打断地以较长的使用寿命进行工作。
在镁镀层以200-1500nm的厚度涂覆在铝镀层上的情况下,可靠地实现Mg镀层的保护效果。在此这样确保实现优化的效果,即,在随后进行的后续热处理之前,使涂覆在Al镀层上的Mg镀层的层厚为300-800nm。
为了可靠地实现在后续热处理过程中使锌通过Al镀层扩散到Mg镀层中,应该使后续热处理的温度为280-350℃,其中,经证实特别有效的是后续热处理的温度为325+/-10℃。典型地,热处理的时间为5-30秒。
具体实施方式
接下来,结合实施例对本发明进行详细说明,。
为了验证本发明的技术效果,进行不同的试验,这些试验的通用的方法流程可以如下文所述:
在形成为待制造的扁钢制品的基础层的钢带(该钢带由品质为DC06的IF钢构成)上、于连续的流程中、电沉积一层2.5μm厚的Zn镀层,该锌镀层富含高达99.9重量%的锌。
然后,该具有Zn镀层的钢带直接在连续的方法流程中继续直接传递到惯用的磁控管喷镀装置,在该装置中,没有进行上文所述的表面氧化物和/或硫化物的去除,而是喷涂一层薄Al镀层。
接下来,使涂有Zn镀层和位于其上的Al镀层的钢基质分别在进行连续的方法流程中传递至同样是惯用的PVD涂层设备(PVD=物理气相沉积),在该涂层设备中,于真空条件下在Al镀层上沉淀形成300nm厚的Mg镀层。
然后,分别进行后续热处理,在该后续热处理中使由基础层和位于该基础层上的涂层构成的扁钢制品在320℃的条件下保持10s,基础层由钢材构成,位于该基础层上的涂层由Zn镀层、Al镀层和Mg镀层形成。以这种方式,在扁钢制品的涂层中形成一个层状结构,在该层状结构中,在钢基础层上是一层基本上由Zn构成的镀层,在该镀层上是含有锌的氧化物和硫化物的薄层,该薄层又被Al镀层覆盖。在Al镀层上又形成MgZn2镀层,该MgZn2镀层再被几个原子层厚的纯的Mg镀层覆盖。
本发明的第一试件E1的Al镀层的厚度通过适宜地调整磁控管喷镀装置的效率而设定为8.5nm。以相应的方式,将本发明的第二试件E2的Al镀层的厚度设定为10.5nm,而将本发明的第三试件E3的Al镀层的厚度设定为13nm。
为了进行比较,使未实施本发明的第一试件V1以惯用的方式通过电镀锌、再采用PVD法进行Mg镀层沉积,并且接下来在320℃的条件下进行后续热处理而镀上ZnMg涂层。
同理,为了进行比较,使未实施本发明的第二试件V2以惯用的方式通过电镀锌、然后进行等离子精洗、再采用PVD法进行Mg镀层沉积以及接下来在320℃的条件下进行后续热处理而镀上ZnMg涂层。在涂覆Mg镀层之前,在该试件处理过程中,没有对Zn镀层上的氧化物和硫化物进行去除处理。
作为第一试验,在试件E1、E2、E3、V1、V2上进行粘接履带弯曲测试(Kleberaupenbiegetest)。对此,每种试件材料采用大约150mm长的带体。
在进行限定的涂油处理之后,在这些带体上分别涂覆惯用的商标名为Betamate 1496的胶粘剂的粘接履带。
在胶粘剂变硬之后,首先在室温RT条件下,使带体突然围绕横向相对于纵向延伸的轴进行折叠。以相同的方式,接下来使相应的试件在-20℃的条件下进行变形。在各自变形的过程中,胶粘剂产生脱落和断裂。
然后,对试件的失去胶粘剂的表面进行可视化分析。在此,要区分的是:金属涂层的内部是否出现脱落(所谓的“脱层断裂”(“Delaminationsbruch”=“DF”));或者,在粘接材料和金属表面之间或在粘接材料内部是否出现脱落(所谓的“混合断裂”(“Mischbruch”=“MF”))。同样,可视化地确定各个试件的粘接履带的断裂面的份额。不期望的结果是,在室温条件下脱层断裂的份额大于5%,这表明涂层存在粘性问题。在表1中综合示出了进行上述分析的结果。
Figure BDA0000112496160000071
Figure BDA0000112496160000081
表1
结果表明,在比较变体1中,在涂覆Mg镀层之前已经进行等离子精洗,在此发生直至100%的混合断裂。
如果省去等离子精洗处理,那么由比较变体2可知,在这种情况下且不具有本发明的薄铝镀层的条件下,在室温时,已经调整到一个更高的脱层断裂份额,而在-20℃时,份额增加到大于90%。
与此相对,利用本发明的试件E1-E3进行的试验表明,大约8.5nm的非常薄的Al镀层在室温条件下的混合断裂份额为100%,即使在-20℃的条件下,份额仍大于90%。因此,根据本发明,在Zn镀层和Mg镀层之间的Al镀层相对于比较变体V1、V2实现了明显的改善。
此外,在其它试件E1-E3和V1、V2上进行拉伸剪切试验。
在拉伸剪切试验中,将两个带体相互粘在一起,其中,这里的胶粘剂也可以采用Betamate 1496。然后,使相互粘接的试件在室温和-20℃的条件下加载拉力,直到粘接点断裂。
该测试在第一部分试件E1-E3和V1、V2中以很短的时间就实现粘接,而在另一部分试件E1-E3和V1、V2中则经过30天的时效处理才能实现粘接。
在以下给出的表2-5中,字母缩写表示的是:
“SF”:钢基础材料的断裂;
“DF”:脱层断裂,也就是涂层的分离;
“AF”:粘附断裂,也就是胶粘剂和表面之间的分离;
“SCF”:邻近表面的粘合断裂,也就是邻近表面的胶粘剂的断裂;
“CF”:粘合断裂,也就是胶粘剂的断裂。
在表2中给出了粘接之后立刻在室温条件下进行的拉伸剪切试验中获得的断裂面份额。
Figure BDA0000112496160000082
表2
在表3中给出的断裂面份额是在粘接之后经过30天的存放再于室温条件下进行拉伸剪切试验而获得的结果。
Figure BDA0000112496160000092
表3
在表4中给出了粘接之后立刻在-20℃的条件下进行的拉伸剪切试验中获得的断裂面份额。
Figure BDA0000112496160000093
表4
在表5中给出的断裂面份额是在粘接之后经过30天的存放再于-20℃的条件下进行拉伸剪切试验而获得的结果。
表5
拉伸剪切试验的结果示出了一个清楚的趋势。在没有进行等离子精洗的条件下,比较示例V2在各种试验条件下都产生较大的脱层断裂份额,该份额达到不期望的数值。
而在使用等离子精洗所制成的比较示例V1仅是在30天后于-20℃的条件下产生这样大的份额。
与此相对,薄铝镀层的沉积生成实现了显著的改善,这是因为,在各种经过试验的由本发明制成的试样E1-E3中脱层断裂份额很少。在此突出的是铝镀层厚度的影响。在所有的试验条件下,脱层断裂份额都会随着铝镀层厚度的增加而减小。

Claims (14)

1.一种用于制造扁钢制品的方法,所述扁钢制品由基础层和涂覆在所述基础层上的、防腐蚀的、具有多层结构的涂层构成,所述基础层由钢材料构成,所述方法包括以下步骤:
-准备基础层;
-通过电镀的方式在基础层上涂覆锌镀层;
-在锌镀层的表面上涂覆最大为25nm厚的铝镀层,其中,锌镀层表面鉴于在加工环境下其表面上的氧化物和硫化物,而保持到一直存在于电镀锌层处理的结束或将进入到铝镀层处理的状态中;
-在铝镀层上涂覆镁镀层;以及
-对这样的扁钢制品进行后续热处理,该扁钢制品具有由涂覆在基础层上的锌镀层、铝镀层和镁镀层构成的涂层,该后续热处理在涂层的表面方向上、于Al镀层上、在涂层中形成MgZn2镀层。
2.根据权利要求1所述的方法,其特征在于,所述锌镀层由高纯锌构成。
3.根据权利要求2所述的方法,其特征在于,所述锌镀层由高达99.9重量%的Zn组成。
4.根据前述任意一项权利要求所述的方法,其特征在于,所述锌镀层以2-10μm的厚度涂覆在基础层上。
5.根据权利要求4所述的方法,其特征在于,所述锌镀层以小于8μm的厚度涂覆在基础层上。
6.根据前述任意一项权利要求所述的方法,其特征在于,所述铝镀层以至少8nm的厚度涂覆在锌镀层上。
7.根据权利要求6所述的方法,其特征在于,涂覆在所述锌镀层上的铝镀层为8.5-13nm厚。
8.根据前述任意一项权利要求所述的方法,其特征在于,所述铝镀层通过阴极溅射法进行涂覆。
9.根据前述任意一项权利要求所述的方法,其特征在于,所述镁镀层以200-1500nm的厚度涂覆在铝镀层上。
10.根据权利要求9所述的方法,其特征在于,涂覆在所述铝镀层上的镁镀层为300-800nm厚。
11.根据前述任意一项权利要求所述的方法,其特征在于,所述后续热处理的温度为280-350℃。
12.一种扁钢制品,由基础层和涂覆在所述基础层上的具有多层结构的涂层构成,所述基础层由钢材料构成,其特征在于,所述涂层包括位于所述基础层上的Zn镀层、邻近表面的MgZn2扩散层和位于Zn镀层和MgZn2扩散层之间的、最大为25nm厚的Al镀层。
13.根据权利要求12所述的扁钢制品,其特征在于,MgZn2镀层的厚度为400-2500nm。
14.根据权利要求12或13所述的扁钢制品,其特征在于,该扁钢制品通过权利要求1至11中任意一项所述的方法制成。
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