CN110578137A - 一种高效化学镀925银的方法 - Google Patents
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Abstract
一种高效化学镀925银的方法,本发明涉及一种采用化学镀的方法在非金属材料表面获得具有优异耐蚀性的925银镀层的方法。本发明是要解决目前化学镀纯银导致的耐蚀性差、表面处理时间长等问题。一种高效化学镀925银的方法:(1)活化液的配制;(2)925银镀液的配制;(3)非金属材料的活化;(4)喷镀925银,在非金属材料表面高效的获得耐蚀性良好的925银镀层。一种高效化学镀925银的方法可以处理任意形状的非金属材料,高效的使非金属材料产生镜面光亮的外观并保持持久色泽,提高了化学镀技术的生产效率和可靠性。
Description
技术领域
本发明属于化学镀领域,涉及一种快速高效化学镀925银镀层的方法,并使镀层具有良好的外观和优异的耐蚀性。
背景技术
在人们的日常生活中,非金属材料发挥着越来越重要的作用,人们利用非金属材料优异的力学、光学等性能,将它们开发制作成各种器件,比如塑料制品、雕塑、玻璃、木器等日常生活中常见的物件均为非金属材料。
然而,非金属材料制品由于普通、暗淡的外观无法满足人们的审美需求,为了使非金属材料制品能够符合人们的眼光往往需要对其进行表面改性,也就是在其表面涂覆一层其它的物质从而改善其外观。因为金属及合金具有优异的光泽,所以在众多表面改性手段中,利用电镀或者化学镀的方式在非金属材料制品表面镀覆金属镀层可以大大改善其外观,故具有广泛的应用。
近年来,为了更加快速的使非金属材料表面金属化,很多企业开发出喷镀技术,其原理与化学镀相同,即利用喷镀液中的还原剂在非金属材料表面将喷镀液中的金属离子还原生成一层金属薄膜。喷镀处理过程比传统的化学镀更快,大大提高了生产效率。比如,在玻璃表面喷镀银可以将其制成镜子,在塑料制品表面喷镀银可以将其制成工艺品,在雕塑表面喷镀银可以使其外观大大改善代替金属雕塑。然而,目前的喷镀技术仅限于喷镀纯银,获得的纯银镀层虽然光学性能良好,但是由于纯银镀层非常容易与环境中的氧气、硫化物以及氯化物反应,因此喷镀获得的镀层耐蚀性并不理想,很快会发黑发暗,从而造成非金属材料制品使用寿命的缩短。在人们日常生活中为了改善纯银首饰的耐蚀性,往往将其制成925银,也就是含银量92.5%的银合金。925银既具有纯银出色的外观和色泽,又由于合金元素的加入使其耐氧、硫、氯等物质腐蚀的能力大大提高。因此,如果能够开发出快速高效的化学镀925银技术,在非金属材料表面获得具有优异外观和耐蚀性能的925银镀层,对于化学镀技术的发展具有重要意义。
发明内容
本发明是要解决目前化学镀纯银镀速慢、生产效率低,以及纯银镀层耐蚀性差的问题,而提供一种高效化学镀925银的方法,使其具有优异的外观和耐蚀性。
本发明的一种高效化学镀925银的方法按以下步骤进行:
(1) 活化液的配制:a. 将浓度为0.05~0.5 g/L的非离子型表面活性剂和浓度为0.2~1.5 g/L的阳离子型聚丙烯酰胺依次溶于去离子水中,搅拌1~5小时后配得活化液H1,其中阳离子型聚丙烯酰胺的分子量为300万~500万;b. 将浓度为0.5~5.0 g/L的柠檬酸钠和浓度为0.2~2.0 g/L的阴离子型表面活性剂依次溶于去离子水中,然后在室温下加入浓度为0.05~1.0 g/L的硝酸银并搅拌0.5小时,采用氢氧化钠调整pH至9.5~11.5后逐滴加入0.2~1.6 g/L的硼氢化钠,配得活化液H2;
(2) 925银镀液的配制:c. 将浓度为1.0~8.0 g/L的络合剂、浓度为0.3~1.5 g/L的硝酸银、浓度为0.2~3.6 g/L的铜盐和浓度为0.3~2.0 g/L的钴盐依次溶于去离子水中,用氢氧化钠调整pH至11.0~12.0后陈化24小时,配得喷镀液A;d. 将浓度为5~16 mL/L的乙醇、浓度为1~10 mL/L的乙醛酸和浓度为0.05~0.5 g/L的非离子型表面活性剂依次溶于去离子水中,用氢氧化钠调整pH值至10.0~12.0,配得喷镀液B;
(3) 非金属材料的活化:e. 用双头喷枪将步骤(1)配制的活化液H1与无水乙醇均匀等量喷在洁净的非金属材料表面,自然干燥后喷淋步骤(1)配制的活化液H2,然后用去离子水将残余的活化液H2清洗干净,获得表面活化的非金属材料;
(4) 喷镀925银:f. 将步骤(2)配制的喷镀液A和喷镀液B在室温下用双头喷枪同时等量喷在经过步骤(3)处理之后的非金属材料表面,非金属材料表面得到均匀925银镀层后继续喷镀5~180秒,然后采用去离子水将残余喷镀液清洗干净再喷淋无水乙醇,热风吹干后完成非金属材料表面喷镀925银。
步骤(1)和步骤(2)中所述的非离子型表面活性剂为OP-10、平平加或PPE中的一种;步骤(2)中所述的络合剂为柠檬酸钠、葡萄糖酸钠、焦磷酸钾或苹果酸钠的一种或其中两种的组合,所述的铜盐为乙酸铜或硝酸铜中的一种,所述的钴盐为乙酸钴或硝酸钴中的一种。
本发明的一种高效化学镀925银的方法,通过在活化液H1中加入具有吸附性的阳离子型聚丙烯酰胺,使其在活化过程中均匀吸附在非金属材料表面,从而通过静电引力固定活化液H2中的银颗粒,使非金属材料表面变为催化表面。通过在喷镀液A中加入铜盐和钴盐,使喷镀过程中铜离子、钴离子都可以与银离子同时发生还原,从而可以快速高效的生成具有优异耐蚀性能的925银镀层。本发明的一种高效化学镀925银的方法不仅可以快速获得与纯银镀层相同的外观,而且可以大大延长镀层的使用寿命。
附图说明
图1为试验一喷镀得到的925银镀层以及普通的纯银镀层在3% NaCl溶液中的Tafel曲线。
具体实施方式
具体实施方式一:本实施方式的一种高效化学镀925银的方法按以下步骤进行:
(1) 活化液的配制:a. 将浓度为0.05~0.5 g/L的非离子型表面活性剂和浓度为0.2~1.5 g/L的阳离子型聚丙烯酰胺依次溶于去离子水中,搅拌1~5小时后配得活化液H1,其中阳离子型聚丙烯酰胺的分子量为300万~500万;b. 将浓度为0.5~5.0 g/L的柠檬酸钠和浓度为0.2~2.0 g/L的阴离子型表面活性剂依次溶于去离子水中,然后在室温下加入浓度为0.05~1.0 g/L的硝酸银并搅拌0.5小时,采用氢氧化钠调整pH至9.5~11.5后逐滴加入0.2~1.6 g/L的硼氢化钠,配得活化液H2;
(2) 925银镀液的配制:c. 将浓度为1.0~8.0 g/L的络合剂、浓度为0.3~1.5 g/L的硝酸银、浓度为0.2~3.6 g/L的铜盐和浓度为0.3~2.0 g/L的钴盐依次溶于去离子水中,用氢氧化钠调整pH至11.0~12.0后陈化24小时,配得喷镀液A;d. 将浓度为5~16 mL/L的乙醇、浓度为1~10 mL/L的乙醛酸和浓度为0.05~0.5 g/L的非离子型表面活性剂依次溶于去离子水中,用氢氧化钠调整pH值至10.0~12.0,配得喷镀液B;
(3) 非金属材料的活化:e. 用双头喷枪将步骤(1)配制的活化液H1与无水乙醇均匀等量喷在洁净的非金属材料表面,自然干燥后喷淋步骤(1)配制的活化液H2,然后用去离子水将残余的活化液H2清洗干净,获得表面活化的非金属材料;
(4) 喷镀925银:f. 将步骤(2)配制的喷镀液A和喷镀液B在室温下用双头喷枪同时等量喷在经过步骤(3)处理之后的非金属材料表面,非金属材料表面得到均匀925银镀层后继续喷镀5~180秒,然后采用去离子水将残余喷镀液清洗干净再喷淋无水乙醇,热风吹干后完成非金属材料表面喷镀925银。
本实施方式的一种高效化学镀925银的方法,通过在活化液H1中加入具有吸附性的阳离子型聚丙烯酰胺,使其在活化过程中均匀吸附在非金属材料表面,从而通过静电引力固定活化液H2中的银颗粒,使非金属材料表面变为催化表面。通过在喷镀液A中加入铜盐和钴盐,使喷镀过程中铜离子、钴离子都可以与银离子同时发生还原,从而可以快速高效的生成具有优异耐蚀性能的925银镀层。本实施方式的一种高效化学镀925银的方法不仅可以快速获得与纯银相同的外观,而且可以大大延长镀层的使用寿命。
具体实施方式二:本实施方式与具体实施方式一不同的是步骤(1)和步骤(2)中所述的非离子型表面活性剂为OP-10、平平加或PPE中的一种。其它与具体实施方式一相同。
具体实施方式三:本实施方式与具体实施方式一或二不同的是步骤(2)中所述的络合剂为柠檬酸钠、葡萄糖酸钠、焦磷酸钾或苹果酸钠的一种或其中两种的组合。其它与具体实施方式一或二相同。
具体实施方式四:本实施方式与具体实施方式一至三之一不同的是步骤(2)中所述的铜盐为乙酸铜或硝酸铜中的一种。其它与具体实施方式一至三之一相同。
具体实施方式五:本实施方式与具体实施方式一至四之一不同的是步骤(2)中所述的钴盐为乙酸钴或硝酸钴中的一种。其它与具体实施方式一至四之一相同。
用以下试验验证本发明的有益效果:
试验一:本试验的一种高效化学镀925银的方法以下步骤进行:
(1) 活化液的配制:a. 将浓度为0.15 g/L的OP-10和浓度为0.8 g/L的阳离子型聚丙烯酰胺依次溶于去离子水中,搅拌3小时后配得活化液H1,其中阳离子型聚丙烯酰胺的分子量为500万;b. 将浓度为0.6 g/L的柠檬酸钠和浓度为1.2 g/L的阴离子型表面活性剂依次溶于去离子水中,然后在室温下加入浓度为0.2 g/L的硝酸银并搅拌0.5小时,采用氢氧化钠调整pH至10.5后逐滴加入0.6 g/L的硼氢化钠,配得活化液H2;
(2) 925银镀液的配制:c. 将浓度为6.0 g/L的络合剂、浓度为0.9 g/L的硝酸银、浓度为2.5 g/L的硝酸铜和浓度为1.6 g/L的硝酸钴依次溶于去离子水中,用氢氧化钠调整pH至11.5后陈化24小时,配得喷镀液A;d. 将浓度为10 mL/L的乙醇、浓度为3 mL/L的乙醛酸和浓度为0.3 g/L的OP-10依次溶于去离子水中,用氢氧化钠调整pH值至10.5,配得喷镀液B;
(3) 非金属材料的活化:e. 用喷枪将步骤(1)配制的活化液H1均匀等量喷在洁净的非金属材料表面,然后喷淋无水乙醇,自然干燥后喷淋步骤(1)配制的活化液H2,再用去离子水将残余的活化液H2清洗干净,获得表面活化的非金属材料;
(4) 喷镀925银:f. 将步骤(2)配制的喷镀液A和喷镀液B在室温下用双头喷枪同时等量喷在经过步骤(3)处理之后的非金属材料表面,非金属材料表面得到均匀925银镀层后继续喷镀30秒,然后采用去离子水将残余喷镀液清洗干净再喷淋无水乙醇,热风吹干后完成非金属材料表面喷镀925银。
步骤(2)中所述的络合剂为柠檬酸钠和葡萄糖酸钠的组合。
本试验通过在活化液H1中加入具有吸附性的阳离子型聚丙烯酰胺,使其在活化过程中均匀吸附在非金属材料表面,从而通过静电引力固定活化液H2中的银颗粒,使非金属材料表面变为催化表面。通过在喷镀液A中加入铜盐和钴盐,使喷镀过程中铜离子、钴离子都可以与银离子同时发生还原,从而可以快速高效的生成与纯银镀层相同外观的925银镀层,镀层中银含量为91.8 wt%,铜含量为5.2 wt%,钴含量为3.0 wt%。本试验得到的925银镀层及普通的纯银镀层在3.5% NaCl溶液中的Tafel曲线如图1所示,从图中可以看出925银镀层的腐蚀电流明显小于纯银镀层,说明其耐蚀性非常优异。
Claims (5)
1.一种高效化学镀925银的方法,其特征在于一种高效化学镀925银的方法按以下步骤进行:
(1) 活化液的配制:a. 将浓度为0.05~0.5 g/L的非离子型表面活性剂和浓度为0.2~1.5 g/L的阳离子型聚丙烯酰胺依次溶于去离子水中,搅拌1~5小时后配得活化液H1,其中阳离子型聚丙烯酰胺的分子量为300万~500万;b. 将浓度为0.5~5.0 g/L的柠檬酸钠和浓度为0.2~2.0 g/L的阴离子型表面活性剂依次溶于去离子水中,然后在室温下加入浓度为0.05~1.0 g/L的硝酸银并搅拌0.5小时,采用氢氧化钠调整pH至9.5~11.5后逐滴加入0.2~1.6 g/L的硼氢化钠,配得活化液H2;
(2) 925银镀液的配制:c. 将浓度为1.0~8.0 g/L的络合剂、浓度为0.3~1.5 g/L的硝酸银、浓度为0.2~3.6 g/L的铜盐和浓度为0.3~2.0 g/L的钴盐依次溶于去离子水中,用氢氧化钠调整pH至11.0~12.0后陈化24小时,配得喷镀液A;d. 将浓度为5~16 mL/L的乙醇、浓度为1~10 mL/L的乙醛酸和浓度为0.05~0.5 g/L的非离子型表面活性剂依次溶于去离子水中,用氢氧化钠调整pH值至10.0~12.0,配得喷镀液B;
(3) 非金属材料的活化:e. 用双头喷枪将步骤(1)配制的活化液H1与无水乙醇均匀等量喷在洁净的非金属材料表面,自然干燥后喷淋步骤(1)配制的活化液H2,然后用去离子水将残余的活化液H2清洗干净,获得表面活化的非金属材料;
(4) 喷镀925银:f. 将步骤(2)配制的喷镀液A和喷镀液B在室温下用双头喷枪同时等量喷在经过步骤(3)处理之后的非金属材料表面,非金属材料表面得到均匀925银镀层后继续喷镀5~180秒,然后采用去离子水将残余喷镀液清洗干净再喷淋无水乙醇,热风吹干后完成非金属材料表面喷镀925银。
2.根据权利要求1所述的一种高效化学镀925银的方法,其特征在于步骤(1)和步骤(2)中所述的非离子型表面活性剂为OP-10、平平加或PPE中的一种。
3.根据权利要求1所述的一种高效化学镀925银的方法,其特征在于步骤(2)中所述的络合剂为柠檬酸钠、葡萄糖酸钠、焦磷酸钾或苹果酸钠的一种或其中两种的组合。
4.根据权利要求1所述的一种高效化学镀925银的方法,其特征在于步骤(2)中所述的铜盐为乙酸铜或硝酸铜中的一种。
5.根据权利要求1所述的一种高效化学镀925银的方法,其特征在于步骤(2)中所述的钴盐为乙酸钴或硝酸钴中的一种。
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