CN114395746A - 一种热镀锡铜带高质量表面处理方法、热镀锡铜带 - Google Patents
一种热镀锡铜带高质量表面处理方法、热镀锡铜带 Download PDFInfo
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Abstract
本发明提供了一种热镀锡铜带高质量表面处理方法、热镀锡铜带,与现有技术相比,本发明表面处理技术重点改进的涂锡前增加了酸洗、表面研磨抛光等技术,有效的解决了表面清洁的问题,有效的改善了锡层与铜带的结合力。镀锡后表面喷涂矿物油,避免了软锡层的直接接触或分条时与设备的直接接触,解决了擦划伤、黑点的问题。同时矿物油的涂抹在冲压时有效的起到了润滑作用,有效的减少了锡粉的产生和堆积,提高了冲压件的品质和效率。
Description
技术领域
本发明属于热镀锡铜带生产方法,具体涉及一种热镀锡铜带高质量表面处理方法、热镀锡铜带。
发明内容
现有技术中,通过在铜带材料与外部接触的表面附着镀锡层,利用锡的化学稳定性高,熔点低,具有良好的可焊接性、导电性和耐蚀性,常以镀锡代镀银,通过特殊的前处理工艺,在复合材料表面形成结合牢固、光亮、致密、均匀、连续的锡镀层,广泛应用于电子元器件、连接件、引线和印制电路板的表面防护。
铜板带镀锡后除提高可焊性外,还可隔绝绝缘材料中硫的作用,铜带镀锡后具有抗氧化性、焊接性能优异等特性,改善了接插件接点导电性,保证电器部件的工作稳定性及可靠性,满足无铅化的环保要求。
随着汽车产业的发展,车载用镀锡铜材蕴藏着极大的市场需求。在热浸镀锡过程中通过融化的锡和铜及铜合金表面之间的反应,在铜基材与锡层之间的接触层形成一硬而且均匀的金属间相,以保证其良好的附着性。镀锡产品广泛的应用于汽车、消费电子、电气工业等行业领域。
但是,目前技术存在热涂锡结合力差、表面缺陷如锡点缺陷多,甚至导致安全事故;锡表面较软,在收卷、裁切过程中因层间相对运动而导致表面擦伤、氧化黑点等表面缺陷。且,现有热镀锡铜带在后续冲压加工过程中易造成锡粉堆积,影响冲压和造成零件污染发黑。
因存在以上问题,现有热镀锡铜带不能满足高质量、高技术行业的使用要求。
本发明的目的在于提供一种热镀锡铜带高质量表面处理方法,通过镀锡前表面处理,提高其锡层的附着性,满足镀锡材折弯时锡层不脱落的要求;通过镀锡后涂油,不仅解决运输、收卷过程中表面擦伤、氧化黑点等缺陷,而且减少了冲压时锡粉的产生和集聚而污染零件,有效的提高了冲压件的品质和效率。
本发明还提供了一种热镀锡铜带,通过上述表面处理得到。
本发明具体技术方案如下:
一种热镀锡铜带高质量表面处理方法,包括以下步骤:
1)铜卷开卷后,进行清洗;
2)研磨抛光后,再次清洗后,烘干;
3)涂助焊剂,再进行热镀锡;
4)风干后、风冷,再进行水冷、烘干;
5)涂油。
步骤1)中,由设备开卷机执行铜带开卷,开卷线速度为5-100m/min;
步骤1)中所述清洗具体包括以下步骤:
1-1)碱脱脂;以去除铜带表面的润滑油脂或乳化油为主;
1-2)刷洗;对碱脱脂的铜带表面进行刷洗,进一步清洁表面;
1-3)冷水喷淋冲洗;对铜带表面残留的碱液进行冲洗。
1-4)酸洗;对铜带表面的氧化进行去除。
1-5)喷淋水洗。
步骤1-1)所述碱脱脂具体为:选用碱性脱脂剂喷淋在铜带表面,以去除铜带表面压延润滑油脂及其他异物;
步骤1-2)中所述刷洗是指采用软毛刷辊对表面进行刷洗;
步骤1-3)中所述冷水喷淋冲洗具体为:采用与环境温度一致的去离子水对铜带进行喷淋;
步骤1-4)酸洗具体为:采用质量浓度为5-15%的H2SO4溶液对表面进行处理,去除表面氧化物等缺陷。
步骤1-5)具体为:采用冷水对铜带进行喷淋;
步骤2)中所述研磨抛光具体为:用目数为1000、2000或3000的磨料以 SiC或Al2O3为主的研磨辊,采用转速为500-1200转/每分钟和压下电流比刷子空转时多1-20%对铜带进行抛光,以去除表面细小缺陷并改善铜带表面质量以提高表面洁净度;
步骤2)中所述清洗具体为:
2-1)进行刷洗;
2-2)热水洗;
步骤2-1)中所述刷洗具体为:采用软毛刷辊对表面进行;
步骤2-2)具体为:采用温度为70-80℃的水进行喷淋清洗;
步骤2)中所述烘干具体为:铜带速度为5-100m/min通过烘干箱,烘干箱的温度为60-80℃;
步骤3)中所述涂助焊剂是指:涂溴化铵和氢溴酸的混合水溶液作为助焊剂,溴化铵和氢溴酸总质量浓度不超过30%;其主要作用是清除铜材表面的氧化物,使表面达到热镀锡所需的清洁度和增加铜带表面活性从而保证锡层的附着性和连续性,防止表面被再次氧化;
步骤3)中所述热镀锡具体为:铜带经过熔融态的锡液池,锡液温度为 240-320℃,使得锡液与铜带表面反应形成镀锡层。
步骤3)中热镀锡形成的镀锡厚度为1-10μm。
步骤4)中所述风干是指利用压缩空气对锡层进行吹扫,使得锡液凝固;
步骤4)中所述风冷具体为:利用冷却气体对镀锡铜带进一步冷却到60℃以下;
步骤4)中所述水冷:通过水冷对涂锡铜带进行再次降温冷却到室温;
步骤4)中所述烘干:对涂锡铜带水冷后进行烘干,烘干温度为40-60℃;
步骤5)中所述涂油具体为:在镀锡铜带表面雾化喷涂一层加氢精致矿物油,雾化压力为20-60KPa,涂油量为2000-6000纳升/秒,生产出具有良好的表面光洁度,且不含氯、硫、磷和重金属,具有优异的润滑和抗承载性能的。
上述表面处理后的产品进行表面检测,利用连续表面检测仪对镀锡铜带表面进行缺陷检测;再裁切,根据要求的宽度对镀锡铜带进行纵向分条裁切。
本发明提供的一种热镀锡铜带,采用上述处理方法生产得到。
发明人发现,现有技术镀锡层与铜带结合力差,主要是因为在镀锡前表面附着物去除不尽;镀锡后因锡层较软,镀锡铜带在收卷,裁切分条易出现擦划伤、氧化黑点等表面质量问题;镀锡铜带在冲压加工过程中造成锡粉堆积影响冲压件的品质;造成热镀锡铜带无法满足高品质应用的要求。
与现有技术相比,本发明表面处理技术重点改进的镀锡前增加了酸洗、表面研磨抛光等技术,有效的解决了表面清洁的问题,有效的改善了锡层与铜带的结合力。镀锡后表面喷涂的加氢精致矿物油,避免了软锡层的直接接触或分条时与设备的直接接触,解决了擦划伤、黑点的问题。同时矿物油的涂抹在冲压时有效的起到了润滑作用,有效的减少了锡粉的产生和堆积,提高了冲压件的品质及效率。
附图说明
图1为实施例1热镀锡铜带高质量表面,表面合格;
图2为实施例1热镀锡铜带剖面图;
图3为对比例1热镀锡铜带表面,表面不合格;
图4为对比例1热镀锡铜带剖面图;
图5对比例1热镀锡铜带表面有针孔缺陷。
具体实施方式
本发明提供的一种热镀锡铜带高质量表面处理方法,包括以下步骤:
1)开卷:由设备开卷机执行,开卷线速度为5-100m/min;
2)碱脱脂:选用水溶碱性溶剂,喷淋在铜带表面;以去除铜带表面的润滑油脂或乳化油为主;
3)刷洗:采用软毛刷辊对表面进行刷洗;进一步清洁表面;
4)冷水洗:采用与环境温度一致的去离子水对铜带进行喷淋;
5)酸洗:采用质量浓度为5-15%的H2SO4溶液对表面进行处理,去除表面氧化物等缺陷。
6)水洗:采用与环境温度一致的去离子水对铜带进行喷淋;
7)研磨抛光:用目数为1000、2000或3000的磨料以SiC或Al2O3为主的研磨辊对铜带进行抛光,控制转速为500-1200转/每分钟和压下电流为空转时的 1-20%对铜带进行抛光,对表面残留的油污进行去除;去除表面细小缺陷,并改善铜带表面质量;
8)刷洗:采用软毛刷辊对表面进行二次刷洗;
9)热水洗:采用温度为70-80℃的水进行喷淋;
10)烘干:铜带速度为5-100m/min通过烘干箱,烘干箱的温度为60-80℃;
11)阻焊剂:涂溴化铵和氢溴酸的混合水溶液作为助焊剂,溴化铵和氢溴酸总质量浓度不超过30%;有利于锡层的均匀分布;
12)涂锡:铜带经过熔融态的锡液池,锡液温度为240~320℃,使得锡液与铜带表面反应形成镀锡层;镀锡厚度为1~10μm;
13)风干:利用压缩空气对锡层进行吹扫,使得锡液凝固;
14)风冷:利用冷却气体对镀锡铜带进一步冷却到60℃以下;
15)水冷:通过水冷对涂锡铜带进行再次降温冷却到室温;
16)烘干:对涂锡铜带水冷后进行烘干,烘干温度为40~60℃;
17)涂油:在涂锡铜带表面利用涂油装置在表面雾化涂抹一层加氢精致矿物油,雾化压力为20~60KPa,涂油量为2000~6000纳升/秒,具有优异的润滑和抗承载性能,生产出具有良好的表面光洁度,且不含氯、硫、磷和重金属。
18)表面检测:利用连续表面检测仪对涂锡铜带表面进行缺陷检测;
19)裁切:根据要求的宽度对镀锡铜带进行纵向分条裁切。
本发明热镀锡铜带表面处理技术的主要效果是增加了对表面的酸洗和用 1000、2000或3000目的研磨刷对表面进行研磨抛光,对铜带压延生产过程的润滑油、热处理氧化层、表面附着物及细小缺陷进行处理,有效的提高了涂锡前铜带的表面质量,在涂锡时使得锡层能够有效的与铜带进行结合,提高其锡层的附着性,满足镀锡材折弯时锡层不脱落的要求。
本发明在镀锡后雾化喷涂一层具有润滑和抗承载性能的加氢精致矿物油,使得涂锡铜带在生产过程的收卷、裁切、运输、开卷时的层间或设备直接接触,有效的避免了涂锡铜带材表面擦划伤、黑点等技术质量问题,提高了涂锡铜带材的表面质量。同时涂抹的矿物油在冲压时起到有效的润滑作用,减少了冲压时锡粉的产生和集聚而污染零件,有效的提高了冲压件的品质。
本发明通过以上改善,热镀锡铜带材的锡层结合力、表面质量、冲压性能等得到有效提高,极大的提高了热镀锡铜带的综合性能,满足汽车、电子电子、通讯等行业对高质量热镀锡铜带材的要求。
实施例1
一种热镀锡铜带高质量表面处理方法,包括以下步骤:
1)开卷:由设备开卷机执行,开卷线速度为80m/min;
2)碱脱脂:选用水溶碱性溶剂,喷淋在铜带表面;以去除铜带表面的润滑油脂或乳化油为主;
3)刷洗:采用软毛刷辊对表面进行刷洗;进一步清洁表面;
4)冷水洗:采用与环境温度一致的去离子水对铜带进行喷淋;
5)酸洗:采用质量浓度为10%的H2SO4溶液对表面进行处理,去除表面氧化物等缺陷。
6)水洗:采用与环境温度一致的去离子水对铜带进行喷淋;
7)研磨抛光:用目数为3000的磨料以SiC为主的研磨辊对铜带进行抛光,控制转速为800转/每分钟和压下电流为额定电流的4%对铜带进行抛光,对表面残留的油污进行去除;去除表面细小缺陷,并改善铜带表面质量;
8)刷洗:采用软毛刷辊对表面进行二次刷洗;
9)热水洗:采用温度为70-80℃的水进行喷淋;
10)烘干:铜带速度为80m/min通过烘干箱,烘干箱的温度为70℃;
11)阻焊剂:涂溴化铵和氢溴酸的混合水溶液作为助焊剂,溴化铵和氢溴酸总质量浓度不超过30%;有利于锡层的均匀分布;
12)涂锡:铜带经过熔融态的锡液池,锡液温度为300℃,使得锡液与铜带表面反应形成镀锡层;镀锡厚度为8μm;
13)风干:利用压缩空气对锡层进行吹扫,使得锡液凝固;
14)风冷:利用冷却气体对镀锡铜带进一步冷却到60℃以下;
15)水冷:通过水冷对涂锡铜带进行再次降温冷却到室温;
16)烘干:对涂锡铜带水冷后进行烘干,烘干温度为50℃;
17)涂油:在涂锡铜带表面利用涂油装置在表面雾化涂抹一层加氢精致矿物油,雾化压力为40KPa,涂油量为4200纳升/秒,具有优异的润滑和抗承载性能,生产出具有良好的表面光洁度,且不含氯、硫、磷和重金属。
18)表面检测:利用连续表面检测仪对涂锡铜带表面进行缺陷检测;
19)裁切:根据要求的宽度对镀锡铜带进行纵向分条裁切。
生产的产品有效的改善了锡层与铜带的结合力,解决了在冲压加工过程中造成锡粉堆积影响冲压件的品质的问题。还解决了擦划伤、黑点的问题。
实施例1产品表面图如图1,可以看出实施例1产品表面镀锡均匀,表面质量高。镀锡层和铜带剖面图如图2,可以看出在上面的锡层与下面铜基材之间的接触层形成一硬而且均匀的金属间相,保证其良好的附着性。
对比例1
一种热镀锡铜带高质量表面处理方法,包括以下步骤:
同实施例1方法,区别在于,不进行步骤7)研磨抛光,步骤12)涂锡温度是240℃,生产的产品表面如图3所示,产品表面锡层有脱落,不合格。且如图5所示,产品表面有针孔缺陷;镀锡层和铜带剖面图如图4,锡层与铜基材之间结合有缺陷,附着力差。
Claims (10)
1.一种热镀锡铜带高质量表面处理方法,其特征在于,所述热镀锡铜带高质量表面处理方法包括以下步骤:
1)铜卷开卷后,进行清洗;
2)研磨抛光后,再次清洗后,烘干;
3)涂助焊剂,再进行热镀锡;
4)风干后、风冷,再进行水冷、烘干;
5)涂油。
2.根据权利要求1所述的热镀锡铜带高质量表面处理方法,其特征在于,步骤1)中所述清洗具体包括以下步骤:
1-1)碱脱脂;
1-2)刷洗;
1-3)冷水喷淋冲洗;
1-4)酸洗;
1-5)喷淋水洗。
3.根据权利要求2所述的热镀锡铜带高质量表面处理方法,其特征在于,步骤1-4)酸洗具体为:采用质量浓度为5-15%的H2SO4溶液对表面进行处理。
4.根据权利要求1所述的热镀锡铜带高质量表面处理方法,其特征在于,步骤2)中所述研磨抛光具体为:用目数为1000、2000或3000的研磨辊对铜带进行抛光。
5.根据权利要求1所述的热镀锡铜带高质量表面处理方法,其特征在于,步骤2)中所述清洗具体为:
2-1)进行刷洗;
2-2)热水洗。
6.根据权利要求5所述的热镀锡铜带高质量表面处理方法,其特征在于,步骤2-2)具体为:采用温度为70-80℃的水进行喷淋清洗。
7.根据权利要求1所述的热镀锡铜带高质量表面处理方法,其特征在于,步骤3)中所述热镀锡具体为:锡液温度为240-320℃。
8.根据权利要求1所述的热镀锡铜带高质量表面处理方法,其特征在于,步骤5)中所述涂油具体为:在镀锡铜带表面雾化喷涂一层加氢精致矿物油。
9.根据权利要求8所述的热镀锡铜带高质量表面处理方法,其特征在于,雾化喷涂中,控制雾化压力为20-60KPa,涂油量为2000-6000纳升/秒。
10.一种热镀锡铜带,其特征在于,采用权利要求1-9任一项所述热镀锡铜带高质量表面处理方法生产得到。
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