CN115537793A - 一种镀锌钢板无铬钝化封闭处理方法 - Google Patents
一种镀锌钢板无铬钝化封闭处理方法 Download PDFInfo
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- passivation
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- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims abstract description 11
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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
- C23C22/48—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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- 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
- C23C22/02—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 non-aqueous solutions
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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
- C23C22/73—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 characterised by the process
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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
- C23C22/82—After-treatment
- C23C22/83—Chemical after-treatment
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- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
本发明公开了一种镀锌钢板无铬钝化封闭处理方法，本发明属于镀锌板无铬处理技术领域，进行后钝化处理提高了钝化膜层厚度，气相三乙胺吹气封闭实现较好的封闭作用，减少钝化膜的孔隙，提高耐腐蚀性，三乙胺在锌表面吸附，增大锌腐蚀反应的活化能，三乙胺作为气相交联剂催化乙基化脲醛树脂、醇溶酚醛树脂交联，得到平整均匀杂化聚合物膜结构，与对甲苯磺酸反应，促进交联，减少膜层孔隙，使膜层更加致密，难以被侵蚀，封闭钝化膜致密，降低了腐蚀反应发生的可能，与传统铬钝化处理相比，不含重金属离子，不含铬酸盐等有害物质，钝化液钢板上均匀分布，钝化膜生成时间短，转化反应较充分，膜层分布较均匀，大大提高了防锈性能，封闭工艺简便易行。
Description
技术领域
本发明属于镀锌板无铬处理技术领域，具体涉及一种镀锌钢板无铬钝化封闭处理方法。
背景技术
镀锌钢板已经被人们广泛使用，锌表面形成的保护膜的稳定性和介质的环境是相互关联的。镀锌钢板在干燥或密闭的环境下，其耐蚀性能还是不错的，隔绝了与溶液的反应，减缓了被继续腐蚀。锌的实际用途用于防腐蚀的镀层由于锌具有优良的抗大气腐蚀性能、稳定性较强，受到工业的好评，虽然它能形成耐蚀性好的物理薄膜，但还是会受到介质环境的腐蚀。随着市场需求的变化，用户对镀锌板的外观质量要求越来越高。能改善镀锌板防腐性能的钝化液，早期认为不影响使用的钝化条痕或钝化斑以及表面发黄（钝化色），逐渐已已经为用户所不能接受。但在实际生产过程中，经钝化液钝化过的钢板也会出现锈蚀的现象。湿的介质中使用会使锌迅速被腐蚀，在中性环境下，由于当存在多种多样复杂的介质，锌容易受到例如可溶性气体、金属离子等介质中杂质的影响，发生侵蚀，而碱性溶液中，由于锌自身的两性，其反应活性较高，很容易在碱性介质存在下，与其反应，进而发生腐蚀。人们通常看到的锌层表面的“白霜”“白锈”或“白毛”就是镀锌层的腐蚀产物。锌对于钢铁制品是阳极镀层，发生腐蚀时，镀层会优先腐蚀。由于锌是电位较负的活泼金属，本身就很容易氧化，在用作镀层时，与正电位金属在一起更会加速腐蚀速度，锌如果很快被腐蚀，就起不到对基体的防护作用。镀锌层遭到腐蚀后不断变薄，这不仅使镀层外观受到破坏，甚至失去对钢铁基体的保护能力。若将镀锌层放在铬酸溶液中进行钝化处理，使镀锌层表面形成一层组织细密、耐蚀性较高的铬酸盐钝化膜后，则可显著地提高镀锌层的抗腐蚀能力。随着可持续发展理念的不断推进，替代传统铬酸盐钝化的无铬钝化方法迫在眉睫。目前镀锌层表面无铬钝化技术总体分为:无机物钝化、有机物钝化和无机-有机物复合型钝化，涉及到铝酸盐、钨酸盐、硅酸盐、稀土金属盐，例如CN201610474467.9公开的电镀锌钢板表面处理无铬钝化液等，和有机类物质如单宁酸、植酸等，例如CN201510380882.3公开的热镀锌钢板无铬钝化剂，以及稀土金属盐钝化、有机硅烧钝化及无机-有机物复合型钝化等等。有机物钝化因其效果及作用单一，稳定性存在一定差异，与传统的铬酸盐钝化液的效果差距明显；无机类钝化也有局限性，耐蚀性较差，总体效果与铬酸盐钝化相比仍有一定差距。本领域技术人员亟待开发出一种镀锌钢板无铬钝化封闭处理方法以满足现有的应用市场和性能需求。
发明内容
有鉴于此，本发明提供一种镀锌钢板无铬钝化封闭处理方法。
对钝化的定义有较多的说法。一般认为:某些活泼金属或其合金，由于它们的阳极过程受到阻滞，这种性能称为金属的钝性。金属具有钝性的现象就称为钝化。
封闭处理sealing：为提高金属阳极氧化膜层的防腐蚀、绝缘耐磨和装饰等性能而进行的后处理过程。以往的封闭方式有重铬酸盐、沸水以及镍盐封闭等。
一种镀锌钢板无铬钝化封闭处理方法，包括镀锌钢板经预钝化后，预钝化液的组成：硅酸钠3g/L、硝酸18g/L、双氧水15mL/L、硫脲5g/L，预钝化工艺为：pH2.5、预钝化温度20℃、预钝化时间10s；
钝化液的组成和使用使设备钝化的溶液称为钝化液，以往几乎所有的钝化液都是碱性物质或磷酸盐等物质的水溶液。
第二步、后钝化：继续采用浸泡法进行后钝化处理，所述后钝化乙醇液的成分为：硫酸4~6g/L、过硫酸钠6~8g/L、硝酸2~3mL/L、钛醇溶胶8~12g/mL、对甲苯磺酸0.05~0.1mL、乙基化脲醛树脂乙醇溶液或热固性醇溶酚醛树脂乙醇溶液1~1.5mL/L，钝化条件为35~40℃，15~20s；第三步、干燥：50~60℃下风干5~10min；第四步、气相封闭：使用三乙胺气雾发生器压缩空气作为载其对钝化后的表面进行三乙胺吹气封闭后65~70℃下陈化3~5min，即得。
三乙胺气体由三乙胺气体发生器产生。
进一步的，所述乙基化脲醛树脂粘度35~40mPa·s，固体含量45%~50%。
乙基化脲醛树脂是由脲与甲醛经过加成反应生成二羟基脲，再用乙醇醚化引进羟基，并经过初步缩聚而生成醇溶性树脂。
进一步的，所述醇溶酚醛树脂分子量700~1000，固体含量45%~50%。
进一步的，所述第二步吹胺时间为8~10s，压缩空气压力0.6MPa~0.8MPa，三乙胺占压缩气体体积的2~4%。
进一步的，所述吹气温度为70~85℃。
进一步的，所述吹气压力为0.2~0.3MPa。
进一步的，所述钛醇溶胶为四氯化钛在乙醇中醇解制备或通过钛酸四丁酯在乙醇中水解缩聚反应得到的质量分数25~30%二氧化钛醇溶胶，其中二氧化钛粒径为5~10nm。
二氧化钛可以掺杂在钝化膜中,起到填充补强作用。
进一步的，所述镀锌钢板为熔融热镀锌钢板或电镀锌钢板。
本发明的有益效果：
本发明在预钝化的基础上，进行后钝化处理，后钝化提高了钝化膜层的厚度，经后续的气相三乙胺吹气封闭实现了很好的封闭作用，减少了钝化膜的孔隙，提高耐腐蚀性，本发明采用三乙胺气相封闭，简单有效，三乙胺在锌的表面既发生物理吸附又发生化学吸附，加入后锌在碱溶液中腐蚀反应的活化能增大，可以起到抑制了锌腐蚀作用，三乙胺封闭对镀锌层有着一定的的缓蚀作用，而且三乙胺可以作为气相交联剂催化乙基化脲醛树脂乙醇溶液或热固性醇溶酚醛树脂乙醇溶液交联，乙醇溶液使用方便，膜层平整均匀对镀锌层进行预钝化和后钝化两次钝化处理，让表面电位发生变化，就会大大提高其表面的抗腐蚀能力，增强镀层对钢板保护作用。在三乙胺作用下，乙基化脲醛树脂乙醇溶液或热固性醇溶酚醛树脂发生进一步交联，最终得到致密复杂的聚合物结构。同时在成膜过程中，三乙胺填充于三维网格空腔中，与对甲苯磺酸盐反应，促进交联，减少膜层孔隙，使膜层更加致密，难以被侵蚀，封闭钝化膜致密，从而降低了腐蚀反应发生的可能，而气相封闭简单易行。
本发明相比现有技术具有以下优点：
以往的封闭方法有沸水、重铬酸盐等等，本发明提供了一种简便易行的气相三乙胺吹气封闭方法，本发明公开的镀锌钢板无铬钝化封闭处理方法是预钝化、后钝化二步法钝化，膜表面均匀致密，与对比例1未进行后钝化等步骤，以及对照例1铬酸盐钝化、以及对照例2未经钝化的原始镀锌钢板对比，本发明公开的镀锌钢板无铬钝化封闭处理方法能够有效抑制电化学腐蚀，提高钝化膜的耐蚀性，在金属表面反应生成化学性质稳定的转化薄膜，提高金属的耐腐蚀性能，从而达到替代传统铬钝化工艺的效果。与传统的铬钝化处理剂相比，不含重金属离子，不含铬酸盐、亚硝酸盐等有毒有害物质，使用的钝化液无残渣，保证钝化液在钢板上的均匀分布，提高了镀锌板的防锈性能，钝化膜生成时间短，转化反应较充分，膜层分布较均匀，大大提高了防锈性能，封闭工艺简便易行，对熔融热镀锌钢板或电镀锌钢板均有较好的耐腐蚀作用。
附图说明
下面结合附图对本发明中的进行详细说明，附图1是实施例1、对比例1、对照例1、对照例2的镀锌钢板tafel极化曲线图，其中a为实施例1、b为对比例1，c为对照例1，d为对照例2。
具体实施方式
实施例1
一种镀锌钢板无铬钝化封闭处理方法，包括以下步骤：
第一步、镀锌钢板为熔融热镀锌钢板2.3mm厚的DX51D+Z，马钢镀锌钢板经预钝化，预钝化液的组成：硅酸钠3g/L、硝酸18g/L、双氧水15mL/L、硫脲5g/L，预钝化工艺为pH2.5、钝化温度20℃、钝化时间10s后取出，其中工业级硝酸质量浓度68%，工业级硫酸质量浓度98%，业级双氧水质量浓度35%；第二步、后钝化：继续采用浸泡法在后钝化槽中进行后钝化处理，所述后钝化乙醇液的成分为：硫酸6g/L、过硫酸钠8g/L、硝酸3mL/L、钛醇溶胶12g/mL、对甲苯磺酸0.1mL、乙基化脲醛树脂乙醇溶液1.5mL/L，后钝化条件为35℃，15s，乙基化脲醛树脂粘度35mPa·s，固体含量45%，工业级硝酸质量浓度68%，工业级硫酸质量浓度98%；第三步、干燥：从后钝化槽中取出50℃下风干5min；第四步、气相封闭：使用山东潍坊银龙YL-15A三乙胺气雾发生器压缩空气作为载其对钝化后的表面进行三乙胺吹气封闭后65℃下陈化3min，所述第二步吹胺时间为8s，压缩空气压力0.6MPa，三乙胺占压缩气体体积的2%，吹气温度为70℃，所述吹气压力为0.2MPa，钛醇溶胶为四氯化钛在乙醇中醇解制备得到的质量分数25%二氧化钛醇溶胶，50份质量浓度为35%的乙醇溶液、28份去离子水、25份质量浓度为8%的盐酸溶液和14份钛酸四丁酯，在5℃冰水浴中搅拌混合15min，随后静置陈化10h，制备得平均粒径为10nm二氧化钛醇溶胶。
对比例1
该对比例与实施例1相比，省去镀锌钢板经预钝化后的步骤，即省去第二、三、四步骤。
实施例2
一种镀锌钢板无铬钝化封闭处理方法，包括以下步骤：第一步、镀锌钢板为BYSB-N5电镀锌钢板，宝钢电镀锌钢板经预钝化后，其中预钝化液的组成：硅酸钠3g/L、硝酸18g/L、双氧水15mL/L、硫脲5g/L，预钝化工艺为pH2.5、预钝化温度20℃、预钝化时间10s后取出，其中工业级硝酸质量浓度68%，工业级硫酸质量浓度98%，业级双氧水质量浓度35%；第二步、后钝化：继续采用浸泡法在后钝化槽中进行后钝化处理，所述后钝化乙醇液的成分为：硫酸6g/L、过硫酸钠8g/L、硝酸3mL/L、钛醇溶胶12g/mL、对甲苯磺酸0.1mL、热固性醇溶酚醛树脂乙醇溶液1.5mL/L，工业级硝酸质量浓度68%，工业级硫酸质量浓度98%，钝化条件为40℃，20s，所述醇溶酚醛树脂分子量1000，固体含量50%；第三步、干燥：从后钝化槽中取出，50℃下风干10min；第四步、气相封闭：使用山东银龙YL-15A三乙胺气雾发生器压缩空气作为载其对钝化后的表面进行三乙胺吹气封闭后70℃下陈化5min，即得，进一步的，所述第二步吹胺时间10s，压缩空气压力0.8MPa，三乙胺占压缩气体体积的4%，吹气温度为85℃，所述吹气压力为0.3MPa，钛醇溶胶为四氯化钛在乙醇中醇解制备或通过钛酸四丁酯在乙醇中水解缩聚反应得到的质量分数30%二氧化钛醇溶胶，其中二氧化钛平均粒径为5nm，二氧化钛醇溶胶的制备：称量45份质量浓度为35%的乙醇溶液、26份去离子水、15份质量浓度为8%的盐酸溶液和12份钛酸四丁酯，在0℃冰水浴中800rpm搅拌混合10min，随后静置陈化12h，制备得二氧化钛醇溶胶。
对照例1
该对照例为实施例1的原始镀锌钢板经铬酸盐钝化，铬酐10g/L，磷酸12mL/L，3g/LCr2O3，pH值1.5，钝化温度40℃，钝化时间10s，空停时间5s。
对照例2
该对照例为实施例1未经任何处理的原始镀锌钢板。
实施例1~2及对比例以及对照例的性能试验结果见表1
表1 实施例1~2及对比例1、对照例1~2以及对照例的性能试验结果
| 项目 | 实施例1 | 实施例2 | 对比例1 | 对照例1 | 对照例2 |
| 外观 | 表面平滑，无粉状或疏松物 | 表面平滑，无粉状或疏松物 | 表面平滑，无粉状或疏松物 | 表面平滑，无粉状或疏松物 | 表面平滑 |
| 耐蚀性h | 72 | 60 | 24 | 6 | - |
| 涂料附着力 | 经摩擦钝化膜不脱落、不露出锌层 | 经摩擦钝化膜不脱落、不露出锌层 | 经摩擦钝化膜不脱落、不露出锌层 | 经摩擦钝化膜不脱落、不露出锌层 | - |
| 盐雾试验72h | 未腐蚀 | 未腐蚀 | 完全腐蚀白锈面积100% | 完全腐蚀白锈面积90% | 完全腐蚀白锈面积100% |
注：GB/T10125-2012人造气氛腐蚀试验盐雾试验；GB/T9791-2003锌、镉、铝-锌合金和锌-铝合金的铬酸盐转化膜试验方法。采用摩擦法测试复合钝化膜与基体之间的结合力，摩擦后肉眼观察钝化膜的磨损和脱落情况，并对摩擦后的复合转化膜样板进行24h的中性盐雾试验。采用中性盐雾法评价钝化膜的耐蚀性，ZT-60C型盐雾箱，操作按GB/T10125-2012。耐蚀性按GB/T10125-2012进行中性盐雾测试。附着力按GB9791-2003中附着力试验方法进行，采用电化学工作站CHI660E三电极体系测试钝化封闭膜的Tafel极化曲线，介质为5%NaCl溶液，温度25℃，工作电极为面积为1cm2待测试样，1cm2的铂丝网为辅助电极，参比电极为饱和甘汞电极，扫描速率1mV/s。
综上可见，实施例1的镀锌钢板无铬钝化封闭膜层的腐蚀电位较对照例2和对比例1以及对照例1均有提高，腐蚀电流密度低，代表无铬钝化封闭膜层对腐蚀介质起到了较好的抑制作用，有效地阻碍了腐蚀电流的传递，放慢了腐蚀过程的电荷转移，遏抑了镀锌层的消溶，达到了较好的延缓腐蚀的效果。
Claims (8)
1.一种镀锌钢板无铬钝化封闭处理方法，包括镀锌钢板经预钝化后，预钝化液的组成：硅酸钠3g/L、硝酸18g/L、双氧水15mL/L、硫脲5g/L，预钝化工艺为：pH2.5、预钝化温度20℃、预钝化时间10s，其特征在于，还包括以下步骤：第一步、预钝化：镀锌钢板继续采用浸泡法进行后钝化处理，所述后钝化乙醇液的成分为：硫酸4~6g/L、过硫酸钠6~8g/L、硝酸2~3mL/L、钛醇溶胶8~12g/mL、对甲苯磺酸0.05~0.1mL、乙基化脲醛树脂乙醇溶液或热固性醇溶酚醛树脂乙醇溶液1~1.5mL/L，后钝化条件为35~40℃，15~20s；第二步、干燥：50~60℃下风干5~10min；第三步、气相封闭：使用三乙胺气雾发生器压缩空气作为载其对钝化后的表面进行三乙胺吹气封闭后65~70℃下陈化3~5min，即得。
2.根据权利要求1所述的一种镀锌钢板无铬钝化封闭处理方法，其特征在于，所述第一步乙基化脲醛树脂粘度35~40mPa·s，固体含量45%~50%。
3.根据权利要求1所述的一种镀锌钢板无铬钝化封闭处理方法，其特征在于，所述第一步醇溶酚醛树脂分子量700~1000，固体含量45%~50%。
4.根据权利要求1所述的一种镀锌钢板无铬钝化封闭处理方法，其特征在于，所述第三步吹胺时间为8~10s，压缩空气压力0.6MPa~0.8MPa，三乙胺占压缩气体体积的2~4%。
5.根据权利要求1所述的一种镀锌钢板无铬钝化封闭处理方法，其特征在于，所述第三步吹气温度为70~85℃。
6.根据权利要求1所述的一种镀锌钢板无铬钝化封闭处理方法，其特征在于，所述第三步吹气压力为0.2~0.3MPa。
7.根据权利要求1所述的一种镀锌钢板无铬钝化封闭处理方法，其特征在于，所述第一步钛醇溶胶为通过钛酸四丁酯在乙醇中水解缩聚反应得到的质量分数25~30%二氧化钛醇溶胶。
8.根据权利要求1所述的一种镀锌钢板无铬钝化封闭处理方法，其特征在于，所述镀锌钢板为熔融热镀锌钢板或电镀锌钢板。
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