CN104342675A - 一种镀锌层无铬钝化膜制备工艺 - Google Patents

一种镀锌层无铬钝化膜制备工艺 Download PDF

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CN104342675A
CN104342675A CN201310316768.5A CN201310316768A CN104342675A CN 104342675 A CN104342675 A CN 104342675A CN 201310316768 A CN201310316768 A CN 201310316768A CN 104342675 A CN104342675 A CN 104342675A
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passivation
galvanized
water
film preparation
acid
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庄进
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WUXI SHITANGWAN INDUSTRIAL PARK DEVELOPMENT CONSTRUCTION Co Ltd
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WUXI SHITANGWAN INDUSTRIAL PARK DEVELOPMENT CONSTRUCTION Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • 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
    • C23C22/06—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
    • C23C22/40—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 containing molybdates, tungstates or vanadates
    • C23C22/42—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 containing molybdates, tungstates or vanadates containing also phosphates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
    • C23C2222/20—Use of solutions containing silanes

Abstract

本发明公开了一种镀锌层无铬钝化膜制备工艺，处理液的组成为：钼酸铵24-26g/L，钨酸钠13-17g/L，85%磷酸50-60ml/L，硅烷10-14ml/L，硼酸4-6g/L，硝酸亚铈6-8g/L，双氧水12-16ml/L，氯化钠14-16g/L，柠檬酸8-10g/L，胡萝卜素7-9g/L，余量为水；所述工艺为：配制具有上述组成的处理液，置于钝化槽中，使其温度为25-35℃，pH值为3-4，镀锌钢板镀锌后经过酸洗出光处理，然后浸渍于钝化槽中，钝化时间为3-5分钟，将钝化后的镀锌件取出用清水冲洗，除去残留钝化液；然后将镀锌件放入75-85℃的热水中浸泡封闭，浸泡封闭4-6分钟，取出干燥即可。

Description

一种镀锌层无铬钝化膜制备工艺
技术领域
本发明涉及表面处理技术领域，尤其涉及一种镀锌层无铬钝化膜制备工艺。
背景技术
铬的工业用途很广，主要有金属加工、电镀、制革行业。这些行业排放的废水和废气是环境中的主要污染源。其中六价铬毒性最大，其很容易被人体吸收，它可通过消化、呼吸道、皮肤及粘膜侵入人体。有报道，通过呼吸空气中含有不同浓度的铬酸酐时有不同程度的沙哑、鼻粘膜萎缩，严重时还可使鼻中隔穿孔和支气管扩张等；经消化道侵入时可引起呕吐、腹疼；经皮肤侵入时会产生皮炎和湿疹；危害最大的是长期或短期接触或吸入时有致癌危险。过量的(超过10ppm)六价铬对水生物有致死作用。实验显示受污染饮用水中的六价铬可致癌，动物喝下含有六价铬的水后，六价铬会被体内许多组织和器官的细胞吸收，且对环境有持久危险性。在欧盟，会致癌或突变的六价铬都不允许公开贩售。镀锌是目前国内外广泛采用防腐蚀手段之一，广泛应用于航空、电力、交通、建筑、机械等行业，但镀锌层在空气中尤其是潮湿环境中易被腐蚀，所以必须进行钝化处理，以提高镀锌层的耐蚀性能。目前金属钝化工艺主要是铬酸盐钝化，因其生成的钝化膜具有良好的屏蔽性能和自修复作用，故具有优良的抗腐蚀性能。但是铬酸盐中所含六价铬具有较高的毒性，对人体和生态环境有较大危害。为此欧盟颁布ROHS指令，自2006年7月1日起，投放欧盟市场的电器电子产品不得含有汞、镉、铅、六价铬、聚溴联苯(PBB)、聚溴二苯醚(PBDE)6种有害物质但钝化液中含有的六价铬致癌且有毒性。所以急需开发低毒性或无毒性的铬酸盐替代品来降低六价铬对人体及环境的危害。近年来，随着环境意识的增强，铬酸盐的使用受到严格限制，世界各国正积极探寻和研究替代铬酸盐钝化工艺的新的表面处理方法，使镀锌层钝化工艺朝着低铬或无铬方向发展。
发明内容
本发明的目的在于提出一种镀锌层无铬钝化膜制备工艺，该工艺采用的钝化膜处理液通过对组份的调整，不使用铬盐，且具备六价铬钝化膜的耐腐蚀性。
为达此目的，本发明采用以下技术方案：
一种镀锌层无铬钝化膜制备工艺，该工艺采用的处理液的组成为：钼酸铵24-26g/L，钨酸钠13-17g/L，85%磷酸50-60ml/L，硅烷10-14ml/L，硼酸4-6g/L，硝酸亚铈6-8g/L，双氧水12-16ml/L，氯化钠14-16g/L，柠檬酸8-10g/L，胡萝卜素7-9g/L，余量为水；所述工艺为：配制具有上述组成的处理液，置于钝化槽中，使其温度为25-35℃，pH值为3-4，镀锌钢板镀锌后经过酸洗出光处理，然后浸渍于钝化槽中，钝化时间为3-5分钟，将钝化后的镀锌件取出用清水快速冲洗，除去残留的钝化液；然后将镀锌件放入75-85℃的热水中浸泡封闭，浸泡封闭4-6分钟，取出干燥即可。
本发明的有益效果为：
采用本发明处理液制备的钝化膜中不含有三价铬及六价铬，不会对人体造成伤害及污染环境，该方法可以有效减少镀锌钝化的环境污染，可以在同样的盐雾环境下获得与有铬钝化相同的耐蚀性效果。该方法制造出来的镀锌钝化产品，可通过盐雾(GB/T2423.17-93中性盐雾试验)140小时而钝化膜不被破坏。
具体实施方式
实施例一
一种镀锌层无铬钝化膜制备工艺，该工艺采用的处理液的组成为：钼酸铵24g/L，钨酸钠17g/L，85%磷酸50ml/L，硅烷14ml/L，硼酸4g/L，硝酸亚铈8g/L，双氧水12ml/L，氯化钠16g/L，柠檬酸8g/L，胡萝卜素9g/L，余量为水；所述工艺为：配制具有上述组成的处理液，置于钝化槽中，使其温度为25℃，pH值为4，镀锌钢板镀锌后经过酸洗出光处理，然后浸渍于钝化槽中，钝化时间为3分钟，将钝化后的镀锌件取出用清水快速冲洗，除去残留的钝化液；然后将镀锌件放入85℃的热水中浸泡封闭，浸泡封闭4-6分钟，取出干燥即可。
实施例二
一种镀锌层无铬钝化膜制备工艺，该工艺采用的处理液的组成为：钼酸铵26g/L，钨酸钠13g/L，85%磷酸60ml/L，硅烷10ml/L，硼酸6g/L，硝酸亚铈6g/L，双氧水16ml/L，氯化钠14g/L，柠檬酸10g/L，胡萝卜素7g/L，余量为水；所述工艺为：配制具有上述组成的处理液，置于钝化槽中，使其温度为35℃，pH值为3，镀锌钢板镀锌后经过酸洗出光处理，然后浸渍于钝化槽中，钝化时间为5分钟，将钝化后的镀锌件取出用清水快速冲洗，除去残留的钝化液；然后将镀锌件放入75℃的热水中浸泡封闭，浸泡封闭6分钟，取出干燥即可。
实施例三
一种镀锌层无铬钝化膜制备工艺，该工艺采用的处理液的组成为：钼酸铵25g/L，钨酸钠15g/L，85%磷酸55ml/L，硅烷12ml/L，硼酸5g/L，硝酸亚铈7g/L，双氧水14ml/L，氯化钠15g/L，柠檬酸99g/L，胡萝卜素8g/L，余量为水；所述工艺为：配制具有上述组成的处理液，置于钝化槽中，使其温度为30℃，pH值为3.5，镀锌钢板镀锌后经过酸洗出光处理，然后浸渍于钝化槽中，钝化时间为4分钟，将钝化后的镀锌件取出用清水快速冲洗，除去残留的钝化液；然后将镀锌件放入80℃的热水中浸泡封闭，浸泡封闭5分钟，取出干燥即可。

Claims (1)

1.一种镀锌层无铬钝化膜制备工艺，其特征在于，该工艺采用的处理液的组成为：钼酸铵24-26g/L，钨酸钠13-17g/L，85%磷酸50-60ml/L，硅烷10-14ml/L，硼酸4-6g/L，硝酸亚铈6-8g/L，双氧水12-16ml/L，氯化钠14-16g/L，柠檬酸8-10g/L，胡萝卜素7-9g/L，余量为水；所述工艺为：配制具有上述组成的处理液，置于钝化槽中，使其温度为25-35℃，pH值为3-4，镀锌钢板镀锌后经过酸洗出光处理，然后浸渍于钝化槽中，钝化时间为3-5分钟，将钝化后的镀锌件取出用清水快速冲洗，除去残留的钝化液；然后将镀锌件放入75-85℃的热水中浸泡封闭，浸泡封闭4-6分钟，取出干燥即可。
CN201310316768.5A 2013-07-25 2013-07-25 一种镀锌层无铬钝化膜制备工艺 Pending CN104342675A (zh)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN105331968A (zh) * 2015-10-15 2016-02-17 当涂县维思共创工业产品设计有限公司 一种铝材防锈处理剂
CN107523820A (zh) * 2017-07-04 2017-12-29 安徽腾龙泵阀制造有限公司 一种用于电镀锌层的无机酸钝化液

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN105331968A (zh) * 2015-10-15 2016-02-17 当涂县维思共创工业产品设计有限公司 一种铝材防锈处理剂
CN107523820A (zh) * 2017-07-04 2017-12-29 安徽腾龙泵阀制造有限公司 一种用于电镀锌层的无机酸钝化液

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Application publication date: 20150211