CN109023336A - 一种环保型稀土盐彩色钝化液及其制备方法 - Google Patents
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- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
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- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/53—Treatment of zinc or alloys based thereon
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
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- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
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Abstract
本发明公开一种环保型稀土盐彩色钝化液及其制备方法,属于金属材料表面处理技术领域。本发明钝化液的组成为:柠檬酸4~12g/L、氯化镧8~10g/L、硝酸1~3mL/L、硫酸钴8~12g/L、双氧水23~25mL/L、其余为去离子水,pH值为0.5~1.5;该钝化液的制备方法将柠檬酸、氯化镧溶解在去离子水中,然后依次加入硝酸、硫酸钴、双氧水并混合均匀,加去离子水定容到所需体积,采用硫酸调节pH值为0.5~1.5即得彩色钝化液。该钝化液处理后的锌镀层钝化膜为彩色,色彩鲜艳,成膜均匀,耐蚀性能优良,并且钝化液中不含三价铬、六价铬及其它有害物质,环保无污染,钝化工艺简单,钝化效率高,膜层耐蚀性好。
Description
技术领域
本发明涉及一种环保型稀土盐彩色钝化液及其制备方法,属金属材料表面处理技术领域。
背景技术
电镀在金属材料保护领域是不可或缺。电镀是利用电解,在制件表面形成均匀、致密、结合良好的金属或合金沉积层,将保护的制件与腐蚀介质隔开,从而达到防腐的效果,这种材料保护的方法操作简单,设备廉价,因此被广泛应用。但如果镀层不进行很好的后处理镀层表面很快就会变暗,并相继出现白色腐蚀产物,从而达不到保护制件的效果。因此,为了提高制件的耐蚀性,一般都会在镀完件后进行钝化处理,使镀层表面形成一层钝化膜。
目前彩色钝化液体系中以铬盐体系为主;铬盐体系中铬是重污染金属,对环境会造成破坏,不符合我国的国情,应用前景不好;目前也有环保型彩色钝化液,但不具备自修复作用,抗腐蚀能力比较差。
发明内容
本发明的目的在于提供一种环保型稀土盐彩色钝化液,该钝化液的组分为:柠檬酸4~12g/L、氯化镧8~10g/L、硝酸1~3mL/L、硫酸钴8~12g/L、双氧水23~25mL/L、其余为去离子水,pH值为0.5~1.5。
本发明的另一目的在于提供所述环保型稀土盐彩色钝化液的配制方法为:将柠檬酸、氯化镧溶解在去离子水中,然后依次加入硝酸、硫酸钴、双氧水并混合均匀,加去离子水定容到所需体积,采用硫酸调节pH值为0.5~1.5即得彩色钝化液。
本发明所述柠檬酸、氯化镧、硝酸、硫酸钴、双氧水均为市售分析纯化学试剂。
使用本发明所述环保型稀土盐彩色钝化液对电镀锌及热镀锌材料进行钝化处理的方法为:将经过电镀锌的材料(常规方法得到)用水清洗干净,按常规方法进行出光处理后,取出材料水洗,再将材料浸入所述环保型稀土盐彩色钝化液中,室温下浸泡55秒后,取出并用水清洗后,干燥即可。
所述出光处理(常规方法)为:将电镀后的材料放入由HNO3和H2O组成的出光液中,于室温下浸泡5秒后,取出即可,其中出光液为:质量浓度为3%的HNO3溶液。
所述经镀锌、出光和钝化后的材料的清洗方法为:去离子水冲洗,或者在装有去离子水的槽中或烧杯中漂洗,直至将镀件表面清洗干净为宜。
所述经钝化后的镀锌材料的干燥方法为:自然晾干、用吹风机吹干或用恒温箱60℃恒温烘干。
本发明的有益效果为:
(1)本发明的环保型稀土盐彩色钝化液可以用于金属材料制件电镀后处理工艺,使用该钝化液进行处理后的镀层钝化膜为彩色,色彩鲜艳,成膜均匀,有很好的耐蚀性,钝化效率高,膜层耐蚀性好。
(2)经本发明钝化液处理得到的钝化膜,耐蚀性优良,经中性盐雾试验出现白锈时间达80h以上。
(3)本发明钝化液中不含铬等有毒物质,克服了铬酸盐钝化技术毒性大、污染环境等缺点,可实现电镀产品的清洁生产。
(4)本发明钝化液的钝化处理工艺简单,钝化时间短,钝化效率高,膜层厚度均匀。
具体实施方式
下面结合具体实施方式对本发明作进一步详细说明,但本发明的保护范围并不限于所述内容。
本发明实施例中所涉及各个工艺过程中所使用的水均为去离子水。
实施例1
本实施例环保型稀土盐彩色钝化液的组分为柠檬酸4g/L、氯化镧8g/L、硝酸1mL/L、硫酸钴8g/L、双氧水23mL/L其余为水,pH值为0.5;
本实施例环保型稀土盐彩色钝化液的配制方法为:按照上述组分称取柠檬酸、氯化镧、硝酸、硫酸钴、双氧水,将柠檬酸、氯化镧溶解在去离子水中,然后依次加入硝酸、硫酸钴、双氧水并混合均匀,加去离子水定容到所需体积,采用硫酸调节pH值为0.5即得环保型稀土盐彩色钝化液;
本实施例制备得到的钝化液用于钝化电镀锌钢板:
(1)所述电镀锌钢板经下列方法得到:将40mm*50mm*1 .0mm的低碳钢板在进行电镀之前按常规进行除锈、除油、活化等前处理后,放入常规电镀液中进行电镀处理,镀锌处理工艺的镀液组成及操作条件为:ZnCl270g/L、KCl 175 g/L、硼酸30g/L、光亮剂0.5ml/L、柔软剂17ml/L、镀液的pH值为5.6,电流密度为 1.5 A/dm2,温度为室温,电镀时间为20分钟,得电镀锌钢板;
(2)配制出光液:将化学纯的HNO3与去离子水配制成浓度为3%的出光液;
(3)将步骤(1)得到的电镀锌钢板用去离子水清洗干净后浸入步骤(2)中得到的出光液中,室温下停留5秒,取出后用去离子水清洗干净,再浸入钝化液中,室温下浸泡55秒后,取出,经去离子水清洗干净后用吹风机吹干;
经钝化液处理后的钢板为彩色,色彩鲜艳,成膜均匀,钝化效率高,膜层耐蚀性好,经5%CuSO4测试,钝化膜完全变黑时间超过52s,经中性盐雾试验出现白锈时间为82小时。
实施例2
本实施例环保型稀土盐彩色钝化液的组分为柠檬酸8g/L、氯化镧9g/L、硝酸2mL/L、硫酸钴10g/L、双氧水24mL/L、其余为水,pH值为1.0;
本实施例环保型稀土盐彩色钝化液的配制方法为:按照上述组分称取柠檬酸、氯化镧、硝酸、硫酸钴、双氧水,将柠檬酸、氯化镧溶解在去离子水中,然后依次加入硝酸、硫酸钴、双氧水并混合均匀,加去离子水定容到所需体积,采用硫酸调节pH值为1即得环保型稀土盐彩色钝化液;
本实施例制备得到的钝化液用于钝化电镀锌钢板,具体方法与实施例1相同。
经钝化液处理后的钢板为彩色,色彩鲜艳,成膜均匀,钝化效率高,膜层耐蚀性好,经5%CuSO4测试,钝化膜完全变黑时间超过56s,经中性盐雾试验出现白锈时间为84小时。
实施例3
本实施例环保型稀土盐彩色钝化液的组分为柠檬酸12g/L、氯化镧10g/L、硝酸3mL/L、硫酸钴12g/L、双氧水25mL/L、其余为去离子水,pH值为1.5;
本实施例环保型稀土盐彩色钝化液的配制方法为:按照上述组分称取柠檬酸、氯化镧、硝酸、硫酸钴、双氧水,将柠檬酸、氯化镧溶解在去离子水中,然后依次加入硝酸、硫酸钴、双氧水并混合均匀,加去离子水定容到所需体积,采用硫酸调节pH值为1.5即得环保型稀土盐彩色钝化液;
本实施例制备得到的钝化液用于钝化电镀锌钢板,具体方法与实施例1相同。
经钝化液处理后的钢板为彩色,色彩鲜艳,成膜均匀,钝化效率高,膜层耐蚀性好,经5%CuSO4测试,钝化膜完全变黑时间超过59s,经中性盐雾试验出现白锈时间为85小时。
以上对本发明的具体实施方式作了详细说明,但是本发明并不限于上述实施方式,在本领域普通技术人员所具备的知识范围内,还可以在不脱离本发明宗旨的前提下做出各种变化。
Claims (2)
1.一种环保型稀土盐彩色钝化液,其特征在于:该钝化液的组分为柠檬酸4~12g/L、氯化镧8~10g/L、硝酸1~3mL/L、硫酸钴8~12g/L、双氧水23~25mL/L、其余为去离子水,pH值为0.5~1.5。
2.权利要求1所述环保型稀土盐彩色钝化液的制备方法,其特征在于,具体步骤如下:将柠檬酸、氯化镧溶解在去离子水中,然后依次加入硝酸、硫酸钴、双氧水并混合均匀,加去离子水定容到所需体积,采用硫酸调节pH值为0.5~1.5即得彩色钝化液。
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