CN107058995A - 一种冷轧板无铬钝化剂及其制备方法 - Google Patents
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Abstract
本发明公开了一种冷轧板无铬钝化剂,由如下重量百分比的原料制成:柠檬酸15~20%、苯并三氮唑3~5%、过硫酸钾1~3%、次氯酸钾1~3%、聚氧乙烯月桂醇醚0.5~1.5%、苯磺酸0.5~0.8%、偏钒酸铵0.3~0.6%、余量为水。与现有技术相比,本发明的有益效果表现在:不含六价铬等有毒有害成分,对环境友好;本发明在冷轧板表面形成的钝化膜,其耐蚀性和漆膜附着力达到铬酸盐钝化技术水平,可以完全替代铬酸盐钝化技术;本发明处理工艺简单,处理时间短,施工方便,适用于规模化工业生产。
Description
技术领域
本发明属于金属表面处理领域,具体涉及一种冷轧板无铬钝化剂及其制备方法。
背景技术
冷轧板具有良好的性能,即通过冷轧,可以得到厚度更薄、精度更高的冷轧带钢和钢板,平直度高、表面光洁度高、冷轧板表面清洁光亮、易于进行涂镀加工、品种多,用途广,同时具有冲压性能高和不时效、屈服点低的特点,所以冷轧板具广泛的用途,主要应用于汽车、印制铁桶、建筑、建材、自行车等行业,同时还是生产有机涂层钢板的最佳选材。
在冷轧板加工完成后,需要进行表面处理,以提升冷轧板的防腐蚀性。在众多的表面处理措施中,六价铬酸盐处理技术已经很成熟,成本低、操作方便、耐蚀性能高而被广泛使用。例如,公开号为CN104975282A的中国发明专利,公开了一种冷轧钢板钝化剂,按重量计由以下原料配制而成:苯磺酸0.5份、次氯酸钾1.2份、质量分数42%的硝酸12份、98%的浓硫酸16份、硝酸铬0.8份、苯并三氮唑2.1份、硝酸镍0.5份。然而,该处理剂中含有对人体及环境极为有害的六价铬,不仅处理过程中会产生污染,而且转化膜中的六价铬还将导致被处理产品在日后使用及废弃时对环境造成二次污染。并且,该处理剂中含有较高浓度的硝酸、浓硫酸,操作过程中易对工作人员的安全造成一定的危害。
从2007年开始,欧洲和北美已全面禁止金属表面铬酸盐处理的各类产品,如铝型材、汽车零部件和电子产品等。因此随着人们环保意识和对六价铬离子毒害性的认识的提高,针对冷轧板的铬酸盐化学转化处理的替代技术研究开发受到广泛的关注。目前,虽然现有市场上某些厂家的冷轧板无铬钝化处理剂产品也达到了环保要求,但是这些产品在与后续涂层的涂装配套性能上还不能达到传统钝化的性能,尤其表现在涂层结合力和整体耐蚀性上,不能满足相关标准的技术要求。
发明内容
为克服现有技术的不足,本发明的目的在于提供一种可以替代传统六价铬酸盐处理技术的适用于冷轧板的环保型无铬钝化处理剂及其制备方法。为实现上述发明目的,本发明采用以下技术方案:
一种冷轧板无铬钝化剂,由如下重量百分比的原料制成:柠檬酸15~20%、苯并三氮唑3~5%、过硫酸钾1~3%、次氯酸钾1~3%、聚氧乙烯月桂醇醚0.5~1.5%、苯磺酸0.5~0.8%、偏钒酸铵0.3~0.6%、余量为水。
优选地,一种冷轧板无铬钝化剂,由如下重量百分比的原料制成:柠檬酸18%、苯并三氮唑4%、过硫酸钾2%、次氯酸钾2%、聚氧乙烯月桂醇醚1%、苯磺酸0.65%、偏钒酸铵0.45%、余量为水。
本发明冷轧板无铬钝化剂的制备方法,包括以下步骤:将柠檬酸、苯并三氮唑和过硫酸钾在反应釜中加入水混溶,然后再加入次氯酸钾和聚氧乙烯月桂醇醚,搅拌溶解后溶液静置5小时;依次加入苯磺酸、偏钒酸铵搅拌溶解后静置2小时,即得冷轧板无铬钝化剂。
本发明冷轧板无铬钝化剂的用法:冷轧板工件经过脱脂洗净后,用质量浓度为1%~10%的本发明处理剂在40~50℃的条件下处理2~30分钟,处理方式可为喷淋法或浸泡法,最后水洗烘干后即可。
本发明的冷轧板无铬钝化剂在冷轧板表面可以生成一层均匀致密的钝化膜,提高了冷轧板的耐蚀性,同时作为冷轧板与后续涂层的中间过渡层,大大增强涂层的附着力。与现有技术相比,本发明的有益效果表现在:1、不含六价铬等有毒有害成分,对环境友好;2、本发明在冷轧板表面形成的钝化膜,其耐蚀性和漆膜附着力达到铬酸盐钝化技术水平,可以完全替代铬酸盐钝化技术;3、本发明处理工艺简单,处理时间短,施工方便,适用于规模化工业生产。
具体实施方式
下面通过实施例对本发明作进一步描述。
实施例1:
一种冷轧板无铬钝化剂,由如下重量百分比的原料制成:柠檬酸15%、苯并三氮唑5%、过硫酸钾1%、次氯酸钾3%、聚氧乙烯月桂醇醚0.5%、苯磺酸0.8%、偏钒酸铵0.3%、余量为水。
上述的冷轧板无铬钝化剂的制备方法,包括以下步骤:将柠檬酸、苯并三氮唑和过硫酸钾在反应釜中加入水混溶,然后再加入次氯酸钾和聚氧乙烯月桂醇醚,搅拌溶解后溶液静置5小时;依次加入苯磺酸、偏钒酸铵搅拌溶解后静置2小时,即得冷轧板无铬钝化剂。
实施例2:
一种冷轧板无铬钝化剂,由如下重量百分比的原料制成:柠檬酸20%、苯并三氮唑3%、过硫酸钾3%、次氯酸钾1%、聚氧乙烯月桂醇醚1.5%、苯磺酸0.5%、偏钒酸铵0.6%、余量为水。
上述的冷轧板无铬钝化剂的制备方法,包括以下步骤:将柠檬酸、苯并三氮唑和过硫酸钾在反应釜中加入水混溶,然后再加入次氯酸钾和聚氧乙烯月桂醇醚,搅拌溶解后溶液静置5小时;依次加入苯磺酸、偏钒酸铵搅拌溶解后静置2小时,即得冷轧板无铬钝化剂。
实施例3:
一种冷轧板无铬钝化剂,由如下重量百分比的原料制成:柠檬酸18%、苯并三氮唑4%、过硫酸钾2%、次氯酸钾2%、聚氧乙烯月桂醇醚1%、苯磺酸0.65%、偏钒酸铵0.45%、余量为水。
上述的冷轧板无铬钝化剂的制备方法,包括以下步骤:将柠檬酸、苯并三氮唑和过硫酸钾在反应釜中加入水混溶,然后再加入次氯酸钾和聚氧乙烯月桂醇醚,搅拌溶解后溶液静置5小时;依次加入苯磺酸、偏钒酸铵搅拌溶解后静置2小时,即得冷轧板无铬钝化剂。
对比实施例1:
一种冷轧板无铬钝化剂,由如下重量百分比的原料制成:柠檬酸18%、苯并三氮唑4%、过硫酸钾2%、次氯酸钾2%、聚氧乙烯月桂醇醚1%、苯磺酸0.65%、余量为水。
上述的冷轧板无铬钝化剂的制备方法,包括以下步骤:将柠檬酸、苯并三氮唑和过硫酸钾在反应釜中加入水混溶,然后再加入次氯酸钾和聚氧乙烯月桂醇醚,搅拌溶解后溶液静置5小时;加入苯磺酸搅拌溶解后静置2小时,即得冷轧板无铬钝化剂。
对比实施例2:
一种冷轧板无铬钝化剂,由如下重量百分比的原料制成:柠檬酸18%、苯并三氮唑4%、过硫酸钾2%、次氯酸钾2%、聚氧乙烯月桂醇醚1%、偏钒酸铵0.45%、余量为水。
上述的冷轧板无铬钝化剂的制备方法,包括以下步骤:将柠檬酸、苯并三氮唑和过硫酸钾在反应釜中加入水混溶,然后再加入次氯酸钾和聚氧乙烯月桂醇醚,搅拌溶解后溶液静置5小时;依次加入偏钒酸铵搅拌溶解后静置2小时,即得冷轧板无铬钝化剂。
对比试验数据如下:
用本发明实施例 1~3、对比实施例1~2的冷轧板钝化剂和传统铬酸盐钝化剂分别对冷轧板进行钝化处理,参考相关国家标准对对比实施例1~2钝化剂、本发明实施例1~3的钝化剂和传统铬酸盐钝化剂处理后的冷轧板表面进行腐蚀性能、漆膜附着力性能的对比测试,结果如下表1、表2:
表1 对比实施例1~2钝化剂的常规性能试验结果
表2 本发明实施例1~3钝化剂的常规性能对比试验结果
通过表中各项试验检测结果,可以得出结论:经过本发明无铬钝化剂处理的冷轧板,与经过传统铬酸盐钝化剂处理的冷轧板相比,具有更优异的耐蚀性能和涂层结合力性能。其中,经本发明实施例3钝化剂处理的冷轧板的耐蚀性最优,大大超过本发明人的预期。并且,通过实施例3、对比实施例1~2的钝化剂对冷轧板处理后的耐蚀性对比试验,可以得出结论,本发明无铬钝化剂配方所采用的苯磺酸和偏钒酸铵两种物质,对于钝化剂整体的耐蚀性的提高具有协同增效的作用。
以上仅为本发明的较佳实施例而已,并非用来限定本发明的实施范围。即凡依本发明申请专利范围的内容所作的等效变化与修饰,只要不偏离或超越本权利要求书所定义的范围,均应属于本发明的保护范围。
Claims (3)
1.一种冷轧板无铬钝化剂,其特征在于,由如下重量百分比的原料制成:柠檬酸15~20%、苯并三氮唑3~5%、过硫酸钾1~3%、次氯酸钾1~3%、聚氧乙烯月桂醇醚0.5~1.5%、苯磺酸0.5~0.8%、偏钒酸铵0.3~0.6%、余量为水。
2.根据权利要求1所述的一种冷轧板无铬钝化剂,其特征在于,由如下重量百分比的原料制成:柠檬酸18%、苯并三氮唑4%、过硫酸钾2%、次氯酸钾2%、聚氧乙烯月桂醇醚1%、苯磺酸0.65%、偏钒酸铵0.45%、余量为水。
3.根据权利要求1或2所述的一种冷轧板无铬钝化剂,其特征在于,制备方法包括以下步骤:将柠檬酸、苯并三氮唑和过硫酸钾在反应釜中加入水混溶,然后再加入次氯酸钾和聚氧乙烯月桂醇醚,搅拌溶解后溶液静置5小时;依次加入苯磺酸、偏钒酸铵搅拌溶解后静置2小时,即得冷轧板无铬钝化剂。
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CN105177545A (zh) * | 2015-08-19 | 2015-12-23 | 合肥市田源精铸有限公司 | 一种冷轧钢板表面处理工艺 |
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CN102409330A (zh) * | 2011-11-25 | 2012-04-11 | 潍坊学院 | 一种无铬钝化液 |
CN104099598A (zh) * | 2014-07-25 | 2014-10-15 | 钱宏彬 | 紫铜无铬化学转化膜处理剂及其制备方法 |
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