CN110121570A - 密封剂粘合性优异的镀锌系钢材及后处理薄膜形成用组合物 - Google Patents
密封剂粘合性优异的镀锌系钢材及后处理薄膜形成用组合物 Download PDFInfo
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- CN110121570A CN110121570A CN201780080160.3A CN201780080160A CN110121570A CN 110121570 A CN110121570 A CN 110121570A CN 201780080160 A CN201780080160 A CN 201780080160A CN 110121570 A CN110121570 A CN 110121570A
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- zinc
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- treatment films
- plated system
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
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- B32B15/00—Layered products comprising a layer of metal
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- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
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- B32B15/00—Layered products comprising a layer of metal
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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Abstract
本发明公开一种镀锌系钢材及后处理薄膜形成用组合物,所述镀锌系钢材包括基材铁和所述基材铁上依次形成的镀锌系层及后处理薄膜,所述后处理薄膜包含选自B、Al、V及Fe中的一种以上的A组元素的氧化物或含氧盐和有机化合物,所述后处理薄膜中的氧原子的含量为50原子%以上,所述后处理薄膜中与氢形成共价键的氧原子的摩尔数为a,与氢不形成共价键的氧原子的摩尔数为b时,a/b为0.3以上。
Description
技术领域
本发明涉及一种密封剂粘合性优异的镀锌系钢材及后处理薄膜形成用组合物。
背景技术
用作汽车板材的镀锌系钢板价格低廉、耐蚀性优异、表面外观精美,因此用作汽车内外板的使用量为逐渐增加的趋势。所述镀覆钢板在汽车制造工艺中依次经过冲压成型工艺、焊接及粘合等组装工艺、脱脂工艺、磷酸盐处理工艺及涂装工艺,此时,镀锌钢板需要润滑性、焊接性、粘合性、涂装性等物理性能。
镀锌系钢板根据钢板上形成的镀层的组成及制造方法显示出不同的物理性能,需要增强差的物理性能。例如,在热浸镀锌钢板(GI)及电镀锌钢板(EG)的情况下,由于柔软的镀层,在伴随高压及高速的摩擦的冲压成型时镀层脱离而熔接在模具的垫圈等。由此,在钢板的表面引发如划痕或凹痕等的缺陷。在合金化热浸镀锌钢板(GA)的情况下,由于高的表面摩擦系数,冲压成型时的润滑特性不充分,因此存在材料本身断裂或发生硬镀层脱落的粉化现象的问题。由于这种原因,需要通过后处理改善所述镀覆钢板的润滑性,除了润滑性之外,还需要满足焊接性、粘合性、涂装性等。
另外,在镀层中包含铝(Al)或镁(Mg)等元素的镀锌合金钢板的情况下,虽然冲压成型性优异,但是由于最表层上存在的稳定的金属氧化物,在汽车车身组装工艺中与密封剂的粘合性降低。
为了解决如上所述的问题,用作汽车板材的镀锌系钢板的表面需要后处理,由此可以提升差的物理性能。
作为与后处理相关的技术,专利文献1中提出了在锌镀层的表面形成磷酸盐层的技术,专利文献2中提出了在锌镀层的表面形成金属氧化物层的技术。但是,形成磷酸盐层的技术需要表面调整、磷酸盐处理、水洗、干燥等过程,实际操作时需要相当的设备空间和溶液管理,并且是依赖于与镀层的反应性的处理方法,因此存在根据镀锌系钢板的种类需要改变溶液组成的不便。另外,形成金属氧化物层的技术受到镀层金属成分的限制,因此不能应用于所有镀锌系钢板。
(专利文献1)韩国公开专利公报第10-2001-0074527号
(专利文献2)日本公开专利公报第2014-185381号
发明内容
要解决的技术问题
本发明的目的之一在于提供一种密封剂粘合性优异的镀锌系钢材及后处理薄膜形成用组合物。
技术方案
本发明的一个方面提供一种镀锌系钢材,所述镀锌系钢材包括基材铁和所述基材铁上依次形成的镀锌系层及后处理薄膜,所述后处理薄膜包含选自B、Al、V及Fe中的一种以上的A组元素的氧化物或含氧盐和有机化合物,所述后处理薄膜中的氧原子的含量为50原子%以上,所述后处理薄膜中与氢形成共价键的氧原子的摩尔数为a,与氢不形成共价键的氧原子的摩尔数为b时,a/b为0.3以上。
本发明的另一个方面提供一种后处理薄膜形成用组合物,所述后处理薄膜形成用组合物包含选自B、Al、V及Fe中的一种以上的A组元素的氧化物或含氧盐和有机化合物,氧原子的含量为50原子%以上,与氢形成共价键的氧原子的摩尔数为a,与氢不形成共价键的氧原子的摩尔数为b时,a/b为0.3以上。
有益效果
作为本发明的效果之一,根据本发明形成后处理薄膜的镀锌系钢材具有密封剂粘合性优异的优点。
另外,本发明的后处理薄膜形成用组合物具有可以与镀层的种类无关地进行应用的优点。
本发明的多个有益的优点和效果并不限定于上述的内容,在说明本发明的具体实施方式的过程中可以更容易理解。
最佳实施方式
一般作为汽车用钢材利用镀锌系钢材,这种镀锌系钢材在汽车制造过程中依次经过冲压成型工艺、焊接及粘合等组装工艺、脱脂工艺、磷酸盐处理工艺及涂装工艺。因此,用作汽车用钢材的镀锌系钢材需要具有优异的冲压加工性、焊接性、密封剂(sealer)粘合性等物理性能。这是因为冲压加工性不充分时,在冲压成型工艺中发生镀层粘附在模具或者材料本身断裂的问题,当焊接性不充分时,在组装工艺中焊接电极发生污染,使得电极寿命及连续焊点的数量降低,当密封剂粘合性不充分时,粘合部的强度发生问题。
基于这种原因,一般在镀锌系钢材上形成后处理薄膜,以增强镀锌系钢材的不足的物理性能,这种后处理薄膜不仅需要如上所述的物理性能,而且还进一步需要优异的脱膜性。这是因为脱膜性不足时,在脱脂工艺中不能充分去除后处理薄膜,由此在作为后续工艺的磷酸盐处理及涂装工艺中引起不良,最终涂装性降低。在这种背景下,本发明的发明人进行了深入的研究,以提供一种冲压加工性、焊接性、密封剂(sealer)粘合性及脱膜性优异的后处理薄膜形成用组合物及形成该后处理薄膜的镀锌系钢材,其结果完成了本发明。
以下,对本发明的一个方面的密封剂粘合性优异的镀锌系钢材进行详细的说明。
本发明的一个方面的密封剂粘合性优异的镀锌系钢材包括基材铁和所述基材铁上依次形成的镀锌系层及后处理薄膜。本发明中对基材铁的具体的种类及形状不作特别限定,例如,可以是热轧钢板、冷轧钢板或钢线材,另外,本发明中对镀锌系层的具体种类不作特别限定,可以是热浸镀锌层、合金化热浸锌镀层、电镀锌层、通过PVD的锌沉积层中的任一种。另外,本发明中对镀锌系层中包含的合金元素的种类及成分范围不作特别限定,例如,镀锌系层中除了包含Zn之外,还可以包含适量的Al、Mg、Si等元素。
后处理薄膜可以包含选自B、Al、V及Fe中的一种以上的A组元素的氧化物或含氧盐和有机化合物,根据需要可以包含选自Mn、Mo及W中的一种以上的B组元素的氧化物或含氧盐。以下,对组成后处理薄膜的各成分进行详细的说明。
A组元素的氧化物或含氧盐
A组元素的氧化物或含氧盐起到提升与涂布在后处理薄膜上的密封剂的粘合性的作用。其中,A组元素是指选自B、Al、V及Fe中的一种以上的元素。
本发明中对A组元素的氧化物或含氧盐的含量不作特别限定。但是,根据非限制性的一个例子,后处理薄膜中可以包含1mol/kg以上的A组元素。当A组元素小于1mol/kg时,后处理薄膜与密封剂的粘合强度可能会不充分。
本发明中对A组元素的氧化物或含氧盐的具体种类也不作特别限定,但是例如A组元素是硼(B)时,A组元素的氧化物或含氧盐可以是硼酸、硼砂等。
根据一个例子,A组元素的氧化物或含氧盐在pH 4~7范围的水溶液中可以具有至少一个羟基,在这种情况下,有利于改善后处理薄膜的密封剂粘合性。
B组元素的氧化物或含氧盐
B组元素的氧化物或含氧盐可以起到增进后处理薄膜与材料的粘合性的作用,但是在本发明中即使不添加所述B组元素的氧化物或含氧盐也在确保期望的密封剂粘合性方面没有太大问题。其中,B组元素是指选自Mn、Mo及W中的一种以上的元素。
本发明中对B组元素的氧化物或含氧盐的含量不作特别限定。但是,根据非限制性的一个例子,后处理薄膜中可以包含3.5mol/kg以下的B组元素。当B组元素的含量超过3.5mol/kg时,A组元素的含量相对减少,因此密封剂粘合性降低,而且与材料的粘合性增加,可能会使后处理薄膜的脱膜性变差。
本发明中对B组元素的氧化物或含氧盐的具体种类不作特别限定,但是例如B组元素是钼(Mo)时,B组元素的氧化物或含氧盐可以是钼酸铵、磷钼酸钠、钼酸钠等。
有机化合物
有机化合物起到使后处理薄膜中的氧化物或含氧盐稳定存在的粘合剂的作用,也在一定程度上有助于改善密封剂粘合性。
本发明中对有机化合物的含量不作特别限定,但是根据非限制性的一个例子,相对于后处理薄膜100重量份,可以包含5~30重量份的有机化合物。当有机化合物的含量小于5重量份时,薄膜稳定性及密封剂粘合性差,另一方面,当有机化合物的含量超过30重量份时,在密封剂粘合性方面有利,但是有机化合物本身可以起到粘合剂的作用,因此发生卷板状态的镀锌系钢材相互粘贴的问题,严重时在汽车组装工艺中的脱脂工艺中后处理薄膜的去除不充分,导致在作为后续工艺的磷酸盐处理工艺及涂装工艺时引起不良。
根据一个例子,有机化合物可以具有至少一个羟基或羧基,更具体可以是选自聚乙酸乙烯酯(PVAc)、聚乙烯醇(PVA)、聚丙烯酸(PAA)、聚乙烯醇缩丁醛(PVB)及聚乙二醇(PEG)中的一种以上。在这种情况下,有利于改善薄膜稳定性及密封剂粘合性。
以下,对后处理薄膜具有的其它特征进行详细的说明。
本发明的一个方面的密封剂粘合性优异的镀锌系钢材的特征在于,后处理薄膜中的氧原子的含量为50原子%以上。当氧原子的含量小于50原子%时,有助于改善与密封剂的粘合性以起到结合位点的作用的羟基的量不足,因此镀锌系钢材与密封剂的粘合强度变差。其中,后处理薄膜中的氧原子的含量是指将镀层成分及氢除外的仅考虑后处理薄膜中的成分和氧而测量或计算的值,可以用丙酮对形成后处理薄膜的镀锌系钢材进行脱脂而去除污染或防锈油,然后利用X射线光电子能谱(X-ray Photoelectron Spectroscopy,XPS)分析法进行测量。其中,计算氧含量时,将镀层成分除外的理由是本发明的后处理薄膜形成用组合物几乎没有与镀层的反应性,当后处理薄膜形成用组合物与镀层成分反应,镀层成分干预后处理薄膜的成分时,应当考虑镀层成分的含量进行计算。另外,薄膜形成用组合物中的氧原子的含量的更加优选的范围为55原子%以上,进一步优选的范围为60原子%以上。
另外,本发明的一个方面的密封剂粘合性优异的镀锌系钢材的特征在于,后处理薄膜中的氧原子中与氢形成共价键的氧原子的摩尔数为a,与氢不形成共价键的氧原子的摩尔数为b时,a/b为0.3以上。当a/b小于0.3时,有助于改善与密封剂的粘合性以起到结合位点的作用的羟基的量不足,因此镀锌系钢材与密封剂的粘合强度变差。a/b的值越大,则越有利于提升密封剂粘合性,因此本发明中对其上限不作特别限定,但是a/b值过大时,在与材料的粘合性及薄膜稳定性方面不利,考虑到这种情况,可以将a/b值的上限限定为10。此时,用丙酮对形成后处理薄膜的镀锌系钢材进行脱脂而去除污染或防锈油,然后通过利用X射线光电子能谱(X-ray Photoelectron Spectroscopy,XPS)分析法测量的氧的结合能峰(binding energy peak)的曲线拟合(curve fitting)可以求出a/b。另外,a/b的更加优选的范围为1.0以上且9.0以下,进一步优选的范围为2.0以上且8.0以下。
根据一个例子,本发明的密封剂粘合性优异的镀锌系钢材的后处理薄膜包含B组元素的氧化物或含氧盐时,在pH 4~7范围的水溶液中具有至少一个羟基的A组元素的摩尔数为c,B组元素的摩尔数为d时,c/d可以为0.5以上。在这种情况下,有利于改善后处理薄膜的密封剂粘合性。另外,c/d值越大,则越有利于改善密封剂粘合性,因此本发明中对其上限不作特别限定,但是c/d值过大时,在与材料的粘合性及薄膜稳定性方面不利,考虑到这种情况,可以将c/d值的上限限定为100。另外,c/d的更加优选的范围为2.0以上且50以下,进一步优选的范围为5.0以上且30以下。
本发明中对形成后处理薄膜的具体方法不作特别限定,但是根据非限制性的一个例子,后处理薄膜可以通过物理气相沉积(Physical Vapor Deposition,PVD)、化学气相沉积(Chemical Vapor Deposition,CVD)等干式涂覆法、热喷涂等粉末喷涂法、辊涂等溶液涂布法等形成,其中,通过溶液涂布法形成时具有工艺简单且工艺运营成本低廉的优点。
但是,通过溶液涂布法形成后处理薄膜时,有必要将涂布后干燥时的干燥温度控制在小于150℃。当干燥温度为150℃以上时,相对于后处理薄膜形成用组合物的a/b,后处理薄膜的a/b变小,因此难以实现改善密封剂粘合性的目的。
本发明中对后处理薄膜的薄膜附着量不作特别限定,但是根据非限制性的一个例子,后处理薄膜的薄膜附着量可以为100~1000mg/m2。当薄膜附着量小于100mg/m2时,由于材料本身的粗糙度,后处理薄膜可能会形成得不均匀,另一方面,当薄膜附着量超过1000mg/m2时,制造成本上升,并且干燥可能会不充分。
以下,对本发明的另一个方面的密封剂粘合性优异的后处理薄膜形成用组合物进行详细的说明。
本发明的另一个方面的后处理薄膜形成用组合物可以包含选自B、Al、V及Fe中的一种以上的A组元素的氧化物或含氧盐和有机化合物,如上所述,根据需要可以包含选自Mn、Mo及W中的一种以上的B组元素的氧化物或含氧盐。后处理薄膜包含上述成分的理由如上所述。另外,本发明中并不排除添加除了所述成分之外的其它有效成分,例如,可以进一步包含平滑剂等。
另外,本发明的薄膜形成用组合物可以以下述成分溶解于水等溶剂中的溶液形态提供,也可以以单纯地将下述成分进行混合的粉末形态提供。当本发明的薄膜形成用组合物以溶液形态提供时,下面说明的各成分的含量、氧原子的含量、氧原子的摩尔数比等是仅以将水等溶剂除外的非挥发性固含量为基准测量的值。
本发明的薄膜形成用组合物的特征在于氧原子的含量为50原子%以上。将薄膜形成用组合物中的氧原子的含量控制在上述范围的理由如上所述。其中,薄膜形成用组合物中的氧原子的含量可以从组成薄膜形成用组合物的具体成分的分子结构计算得出。
另外,本发明的薄膜形成用组合物的特征在于,与氢形成共价键的氧原子的摩尔数为a,与氢不形成共价键的氧原子的摩尔数为b时,a/b为0.3以上。将a/b控制在上述范围的理由如上所述。其中,a/b可以从组成薄膜形成用组合物的具体成分的分子结构计算得出。
本发明中对薄膜形成用组合物的pH不作特别限定,但是为了防止镀层的溶解的同时形成稳定的薄膜,pH优选为3.0至7.0。
具体实施方式
以下,通过实施例对本发明进行更详细的说明。但是,这些实施例的记载仅用于例示本发明的实施,本发明并不受这些实施例的限制。这是因为本发明的权利范围由权利要求书中记载的事项和由此合理推导的事项确定。
(实施例)
准备镀锌系钢板,该镀锌系钢板的厚度为0.8mm,伸长率为36~37%,镀覆量为35g/m2,镀层由Al:1.4%、Mg:1.4%、Zn:97.2%组成,通过棒涂法将后处理涂覆溶液涂布在镀锌系钢板上,然后在PMT 100℃条件下形成后处理薄膜,以使附着量为300mg/m2。对于各试片,仅改变组成薄膜形成用组合物的成分的含量来制作后处理薄膜,所制作的后处理薄膜中含有的各成分的含量示于下表1中。另外,下表1中的现有例是没有形成后处理薄膜的例子。
之后,测量后处理薄膜中的氧含量及a/b,将其结果一同示于下表1中。此时,后处理薄膜中的氧含量是对形成后处理薄膜的镀锌系钢材通过X射线光电子能谱(X-rayPhotoelectron Spectroscopy,XPS)分析法测量的纳米尺度的每单位深度的平均值,a/b是通过利用XPS分析法测量的氧(O)的结合能峰(Binding Energy Peak)的曲线拟合(CurveFitting)求出的每单位深度的平均值。
之后,评价各试片的加工性、密封剂粘合性及脱膜性,将其结果一同示于下表1中。
<加工性的评价>
为了评价加工性,进行杯突试验,所述杯突试验使用由模具和冲头构成的试验机,提高压边力(Blank Holding Force,BHF)的同时进行试验,将材料发生断裂之前那一刻的BHF值作为最大BHF值并记载于表1中。最大BHF值越大,则表示加工性越优异,本实施例中进行的杯突试验的详细条件如下。
※杯突试验的详细条件
-冲头直径(Punch diameter):50mm
-冲头末端半径(Punch edge radius):6mm
-模具直径(Die diameter):52.25mm
-冲头移动速度:230mm/min
-后处理薄膜与模具接触,在表面涂布清洗油后进行试验。
<密封剂粘合性的评价>
对于粘合性试验,以25mm×100mm的尺寸制作两张试片,涂布清洗油后垂直竖立放置1天,然后从试片末端向10mm内侧以25mm(宽度)×25mm(长度)×3mm(高度)的尺寸涂布乳香密封剂(mastic sealer)粘合剂,叠加其余试片并在170℃下固化20分钟,然后测量上下试片的粘合剪切强度,将其结果示于表1中。剪切强度是以50mm/min的速度测量,将测量的最大剪切力除以粘合面积6.25cm2进行记录。此时,对于密封剂粘合性是否良好,以1.0kgf/cm2的粘合强度为基准,该值以上时,判断为良好。
<脱膜性的评价>
对于脱膜性试验,使用汽车制造工艺中使用的脱脂溶液,在50~55℃下将材料搅拌浸渍2分钟并进行水洗,然后测量材料表面残留的涂覆薄膜的量,将相对于脱脂前的薄膜附着量的脱膜率以百分率计算并示于表1中。对于涂覆薄膜残留量,用酸溶液溶解一定面积的涂层,然后用电感耦合等离子体(Inductively Coupled Plasma,ICP)对溶解溶液中的钼含量进行定量分析,以此计算每面积的残留量。
[表1]
如表1所示,可以知道氧(O)含量小于50原子%或者a/b小于0.3的比较例1及2和现有例中,粘合强度小于1.0kgf/cm2,不能满足密封剂粘合性标准。
与此不同,后处理薄膜中的氧(O)含量为50原子%以上且a/b为0.3以上的发明例1至12中,充分满足1.0kgf/cm2以上的粘合强度标准,尤其显示出薄膜中的氧(O)含量及a/b越增加则粘合强度增加的倾向。但是,发明例11及12中,涂覆后干燥时,由于薄膜组成不均匀,产生轻微的斑痕。
另外,虽然粘合强度标准为1.0kgf/cm2,但是考虑到剪切强度评价后的粘合部断裂面的内聚破坏率等,为了确保更坚固的粘合强度,更优选地,所述后处理薄膜中包含的氧(O)含量为55原子%以上,a/b为1.0以上。
与薄膜中的氧含量或a/b无关,最大BHF值及脱膜性在所有后处理薄膜条件下显示出优异的特性。尤其,就最大BHF值而言,与未经处理的材料的现有例相比,形成后处理薄膜的比较例1、2及发明例1至12中均显示出更高的值,这表示形成后处理薄膜时加工性显著提升。
另外,本实施例中通过大量的氧化物或含氧盐和少量的有机化合物来控制薄膜中的a/b,但并不限定于此,也可以通过薄膜中30重量%以下的有机化合物的分子结构内存在的氧和羟基的比例进行控制。
如上对本发明的实施例进行了详细的说明,但是本发明的权利范围并不限定于此,在不脱离权利要求书中记载的本发明的技术思想的范围内可以进行各种修改及变形,这对于本技术领域中具有通常知识者来说是显而易见的。
Claims (18)
1.一种镀锌系钢材,包括基材铁和所述基材铁上依次形成的镀锌系层及后处理薄膜,所述后处理薄膜包含选自B、Al、V及Fe中的一种以上的A组元素的氧化物或含氧盐和有机化合物,所述后处理薄膜中的氧原子的含量为50原子%以上,所述后处理薄膜中与氢形成共价键的氧原子的摩尔数为a,与氢不形成共价键的氧原子的摩尔数为b时,a/b为0.3以上。
2.根据权利要求1所述的镀锌系钢材,其中,所述后处理薄膜还包含选自Mn、Mo及W中的一种以上的B组元素的氧化物或含氧盐。
3.根据权利要求1所述的镀锌系钢材,其中,所述后处理薄膜中的氧原子的含量为55原子%以上。
4.根据权利要求1所述的镀锌系钢材,其中,所述后处理薄膜中的氧原子的含量为60原子%以上。
5.根据权利要求1所述的镀锌系钢材,其中,所述a/b为10.0以下。
6.根据权利要求1所述的镀锌系钢材,其中,所述a/b为1.0以上且9.0以下。
7.根据权利要求1所述的镀锌系钢材,其中,所述a/b为2.0以上且8.0以下。
8.根据权利要求1所述的镀锌系钢材,其中,所述A组元素的氧化物或含氧盐在pH4~7范围的水溶液中具有至少一个羟基。
9.根据权利要求2所述的镀锌系钢材,其中,所述A组元素的氧化物或含氧盐在pH4~7范围的水溶液中具有至少一个羟基,所述A组元素的摩尔数为c,所述B组元素的摩尔数为d时,c/d为0.5以上。
10.根据权利要求9所述的镀锌系钢材,其中,所述c/d为100以下。
11.根据权利要求9所述的镀锌系钢材,其中,所述c/d为2.0以上且50以下。
12.根据权利要求9所述的镀锌系钢材,其中,所述c/d为5.0以上且30以下。
13.根据权利要求1所述的镀锌系钢材,其中,相对于所述后处理薄膜100重量份,包含5~30重量份的所述有机化合物。
14.根据权利要求1所述的镀锌系钢材,其中,所述有机化合物具有至少一个羟基或羧基。
15.根据权利要求1所述的镀锌系钢材,其中,所述有机化合物是选自聚乙酸乙烯酯(PVAc)、聚乙烯醇(PVA)、聚丙烯酸(PAA)、聚乙烯醇缩丁醛(PVB)及聚乙二醇(PEG)中的一种以上。
16.根据权利要求1所述的镀锌系钢材,其中,所述后处理薄膜的薄膜附着量为100~1000mg/m2。
17.一种后处理薄膜形成用组合物,其包含选自B、Al、V及Fe中的一种以上的A组元素的氧化物或含氧盐和有机化合物,氧原子的含量为50原子%以上,与氢形成共价键的氧原子的摩尔数为a,与氢不形成共价键的氧原子的摩尔数为b时,a/b为0.3以上。
18.根据权利要求17所述的后处理薄膜形成用组合物,其中,所述薄膜形成用组合物的pH为3.0至7.0。
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