CN106119860A - 一种复合热镀锌钢丝的制备方法 - Google Patents
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 239000011701 zinc Substances 0.000 title claims abstract description 32
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 32
- 150000001875 compounds Chemical class 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 63
- 239000010959 steel Substances 0.000 claims abstract description 63
- 238000005246 galvanizing Methods 0.000 claims abstract description 57
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910000077 silane Inorganic materials 0.000 claims abstract description 19
- 239000012530 fluid Substances 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 238000002161 passivation Methods 0.000 claims abstract description 15
- 210000000981 epithelium Anatomy 0.000 claims abstract description 9
- 238000010791 quenching Methods 0.000 claims abstract description 9
- 229910000975 Carbon steel Inorganic materials 0.000 claims abstract description 7
- 239000010962 carbon steel Substances 0.000 claims abstract description 7
- 238000005470 impregnation Methods 0.000 claims abstract description 7
- 238000005406 washing Methods 0.000 claims abstract description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 8
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 8
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 8
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 8
- 238000007654 immersion Methods 0.000 claims description 8
- 230000000171 quenching effect Effects 0.000 claims description 8
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 8
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 8
- 150000007524 organic acids Chemical class 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 4
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 235000011164 potassium chloride Nutrition 0.000 claims description 4
- 239000001103 potassium chloride Substances 0.000 claims description 4
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 claims description 4
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 4
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 4
- 235000013024 sodium fluoride Nutrition 0.000 claims description 4
- 239000011775 sodium fluoride Substances 0.000 claims description 4
- 235000005074 zinc chloride Nutrition 0.000 claims description 4
- 239000011592 zinc chloride Substances 0.000 claims description 4
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 claims description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 2
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims description 2
- 235000015165 citric acid Nutrition 0.000 claims description 2
- 239000004310 lactic acid Substances 0.000 claims description 2
- 235000014655 lactic acid Nutrition 0.000 claims description 2
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- 235000011090 malic acid Nutrition 0.000 claims description 2
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 claims description 2
- 229960004889 salicylic acid Drugs 0.000 claims description 2
- 239000011975 tartaric acid Substances 0.000 claims description 2
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- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000012467 final product Substances 0.000 abstract 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 8
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 229910021556 Chromium(III) chloride Inorganic materials 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 4
- 229960000359 chromic chloride Drugs 0.000 description 4
- QSWDMMVNRMROPK-UHFFFAOYSA-K chromium(3+) trichloride Chemical compound [Cl-].[Cl-].[Cl-].[Cr+3] QSWDMMVNRMROPK-UHFFFAOYSA-K 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229910017604 nitric acid Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
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- 230000007423 decrease Effects 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003585 thioureas Chemical class 0.000 description 1
- 150000003752 zinc compounds Chemical class 0.000 description 1
Classifications
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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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
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- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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Abstract
本发明涉及一种复合热镀锌钢丝的制备方法，包括如下步骤：(1)将碳钢高线经水浴淬火后，进行第一次拉拔，再将第一次拉拔后的钢丝经过热镀锌处理液进行热镀锌，随后将热镀锌后的钢丝进行第二次拉拔，即得热镀锌钢丝；(2)将步骤(1)得到的热镀锌钢丝先脱脂并水洗后，采用硅烷皮膜剂溶液浸渍，干燥，使热镀锌钢丝的热镀锌层表面生成硅烷皮膜；(3)将步骤(2)得到的热镀锌钢丝浸入钝化层处理液，在200～260℃下烘烤60～180s，使得热镀锌钢丝的硅烷皮膜表面生成钝化层，即得。本发明制备得到的热镀锌钢丝表面光滑，耐腐蚀性能优秀；生产过程流水线化，易于生产，具有良好的应用前景。
Description
技术领域
本发明属于钢丝领域，特别涉及一种复合热镀锌钢丝的制备方法。
背景技术
众所周知，目前国内外在金属材料加工技术领域生产/使用的镀锌钢丝主要有二种：一种是冷镀锌钢丝，一种是热镀锌钢丝。
冷镀锌钢丝，它是用碳钢高线进行拉拔生产，在生产中产品经拉拔成形，水洗、除油除锈、再水洗，冷镀锌后，将其放入三价铬酸化成液(即三氯化铬与硝酸的混合液，二者的容积比为：三氯化铬:硝酸＝1:0.8～1.2)的水溶液浸渍30～60秒，并在常温、常压下空中放置加热50～60℃直至干燥，使热镀锌钢丝表面迅速生成致密的三价游离铬酸皮膜。其优点是表面平滑光亮、外观效果很好；但缺点也很突出，主要表现在几个方面：1)镀锌层很薄只有约30～80克/平方米，不能镀厚，若镀厚则镀锌层会很容易开裂和剥落，这导致钢丝产品在湿润或酸碱条件下很容易生锈，正常室外条件下使用1～3个月即会开始生锈；2)镀锌层很脆，若钢丝产品在受力弯曲状态使用时或受外力突然冲击变形时，镀锌层很容易开裂甚至剥落，镀锌层开裂或剥落后将使钢丝本体直接触及水或空气，这直接加速了钢丝产品的生锈；这种冷镀锌钢丝生产的产品使用寿命非常短，在室外基本只能使用一个生产季度；3)用三价铬酸化成液处理后加热干燥的温度要求严格控制在50～60℃，当干燥温度控制不好而超过70℃时，铬酸皮膜的耐腐蚀性能会急剧下降。
热镀锌钢丝是用碳钢高线进行拉拔生产，经拉拔成形并热浸镀锌后，再经水洗，用三价铬酸化成液(即三氯化铬与硝酸的混合液，二者的容积比为三氯化铬:硝酸＝1:0.8～1.2)的水溶液浸渍30～60秒，并在常温、常压下空中放置加热50～60℃直至干燥，使热镀锌钢丝表面迅速生成致密的三价游离铬酸皮膜。其优点是镀锌层可以镀得很厚，可达到约200～500克/平方米，且钢丝产品在受力弯曲状态使用时或受外力突然冲击变形时，镀锌层也不会开裂或剥落，使用寿命很长；缺点是：1)钢丝热浸镀锌过程中由于钢丝抖动、锌液面波动、镀锅中表面浮渣等原因造成在钢丝表面形成局部锌层堆积(俗称锌瘤)，及因部分锌氧化成氧化物和其他锌化合物所形成的锌灰沾附在钢丝锌层表面，从而使镀锌层表面坑坑洼洼很不平滑，表面暗淡没有光亮度，表面效果非常差；用这种热镀锌钢丝生产的产品由于外表难看吸引不了客人，销售效果不好；2)用三价铬酸化成液处理后加热干燥的温度要求严格控制在50～60℃，当干燥温度控制不好超过70℃时，铬酸皮膜的耐腐蚀性能会急剧下降。
现有技术中往往采用调整钢材本身元素比例或者在钢丝表面涂覆单一的钝化层来取得良好的耐腐蚀性能，但是仍然存在种种不足，如增加成本、工艺过于繁琐或是钝化层效果不佳，限制了热镀锌钢丝的应用。
发明内容
本发明所要解决的技术问题是提供一种复合热镀锌钢丝的制备方法，该方法制备得到的热镀锌钢丝表面光滑，耐腐蚀性能优秀；生产过程流水线化，易于生产，具有良好的应用前景。
本发明的一种复合热镀锌钢丝的制备方法，包括如下步骤：
(1)将碳钢高线经水浴淬火后，进行第一次拉拔，再将第一次拉拔后的钢丝经过热镀锌处理液进行热镀锌，随后将热镀锌后的钢丝进行第二次拉拔，即得热镀锌钢丝；
(2)将步骤(1)得到的热镀锌钢丝先脱脂并水洗后，采用硅烷皮膜剂溶液浸渍，干燥，使热镀锌钢丝的热镀锌层表面生成硅烷皮膜；
(3)将步骤(2)得到的热镀锌钢丝浸入钝化层处理液，在200～260℃下烘烤60～180s，使得热镀锌钢丝的硅烷皮膜表面生成钝化层，即得复合热镀锌钢丝。
所述步骤(1)中水浴淬火的条件为：水淬火液温度：90±5℃；出炉线温：930±20℃；出水线温：610±30℃；浸液长度：2.4～3.2m；钢丝浸入深度：10～15mm。
所述步骤(1)中热镀锌处理液还含有助镀剂；其中，助镀剂的组成为：氯化铝20-25g/L、氯化锌31-35g/L、氯化钾5-6g/L、氟化钠5-8g/L、碳酸氢钠2-5g/L。
所述步骤(2)中硅烷皮膜剂溶液浓度为1～2％，pH值为8～9。
所述步骤(3)中钝化层处理液的组成为：由15.0～20.0wt％的环氧树脂、2～5wt％的双氧水、3～6wt％的有机酸和水组成。
所述有机酸选自柠檬酸、酒石酸、苹果酸、水杨酸、乳酸中的一种或几种。
有益效果
(1)本发明采用水浴淬火代替铅淬火，成本显著降低，同时钢丝力学性能稳定；
(2)本发明在钢丝表面热镀锌后再分别生成硅烷皮膜和钝化层，不仅可以保证钢丝外观色泽要求，有效改善镀锌层的耐腐蚀性性能，提高镀锌层的使用寿命；而且避免使用重金属，对环境更友好，成本也更低；
(3)本发明制备得到的热镀锌钢丝表面光滑，耐腐蚀性能优秀，使用寿命可达15年以上；
(4)本发明生产过程流水线化，易于生产，具有良好的应用前景。
附图说明
图1为本发明热镀锌钢丝的侧视图；其中，1为热镀锌钢丝；2为硅烷皮膜层；3为钝化层；
图2为本发明采用的水浴淬火示意图；
图3为本发明钢丝的处理流程图。
具体实施方式
下面结合具体实施例，进一步阐述本发明。应理解，这些实施例仅用于说明本发明而不用于限制本发明的范围。此外应理解，在阅读了本发明讲授的内容之后，本领域技术人员可以对本发明作各种改动或修改，这些等价形式同样落于本申请所附权利要求书所限定的范围。
实施例1
(1)将碳钢高线经水浴淬火后，进行第一次拉拔，再将第一次拉拔后的钢丝经过热镀锌处理液进行热镀锌，随后将热镀锌后的钢丝进行第二次拉拔，即得热镀锌钢丝；水淬火液温度：95℃；出炉线温：950℃；出水线温：650℃；浸液长度：2.4m；钢丝浸入深度：10mm；热镀锌处理液还含有助镀剂；其中，助镀剂的组成为：氯化铝20g/L、氯化锌31g/L、氯化钾5g/L、氟化钠6g/L、碳酸氢钠5g/L；
(2)将步骤(1)得到的热镀锌钢丝先脱脂并水洗后，采用2％硅烷皮膜剂(LG-209，常州良工环保科技有限公司)溶液浸渍，干燥，使热镀锌钢丝的热镀锌层表面生成硅烷皮膜；
(3)将步骤(2)得到的热镀锌钢丝浸入钝化层处理液(15.0wt％的环氧树脂、2wt％的双氧水、3wt％的柠檬酸和水组成)，在260℃下烘烤60s，使得热镀锌钢丝的硅烷皮膜表面生成钝化层，即得复合热镀锌钢丝，GB/T 6461-2002测试结果见表1。
实施例2
(1)将碳钢高线经水浴淬火后，进行第一次拉拔，再将第一次拉拔后的钢丝经过热镀锌处理液进行热镀锌，随后将热镀锌后的钢丝进行第二次拉拔，即得热镀锌钢丝；水淬火液温度：95℃；出炉线温：950℃；出水线温：64℃；浸液长度：3.2m；钢丝浸入深度：15mm；热镀锌处理液还含有助镀剂；其中，助镀剂的组成为：氯化铝25g/L、氯化锌35g/L、氯化钾6g/L、氟化钠8g/L、碳酸氢钠5g/L；
(2)将步骤(1)得到的热镀锌钢丝先脱脂并水洗后，采用2％硅烷皮膜剂(LG-209，常州良工环保科技有限公司)溶液浸渍，干燥，使热镀锌钢丝的热镀锌层表面生成硅烷皮膜；
(3)将步骤(2)得到的热镀锌钢丝浸入钝化层处理液(20.0wt％的环氧树脂、5wt％的双氧水、6wt％的有机酸和水组成)，在200℃下烘烤180s，使得热镀锌钢丝的硅烷皮膜表面生成钝化层，即得复合热镀锌钢丝，GB/T 6461-2002测试结果见表1。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
Claims (6)
1.一种复合热镀锌钢丝的制备方法，包括如下步骤：
(1)将碳钢高线经水浴淬火后，进行第一次拉拔，再将第一次拉拔后的钢丝经过热镀锌处理液进行热镀锌，随后将热镀锌后的钢丝进行第二次拉拔，即得热镀锌钢丝；
(2)将步骤(1)得到的热镀锌钢丝先脱脂并水洗后，采用硅烷皮膜剂溶液浸渍，干燥，使热镀锌钢丝的热镀锌层表面生成硅烷皮膜；
(3)将步骤(2)得到的热镀锌钢丝浸入钝化层处理液，在200～260℃下烘烤60～180s，使得热镀锌钢丝的硅烷皮膜表面生成钝化层，即得复合热镀锌钢丝。
2.根据权利要求1所述的一种复合热镀锌钢丝的制备方法，其特征在于：所述步骤(1)中水浴淬火的条件为：水淬火液温度：90±5℃；出炉线温：930±20℃；出水线温：610±30℃；浸液长度：2.4～3.2m；钢丝浸入深度：10～15mm。
3.根据权利要求1所述的一种复合热镀锌钢丝的制备方法，其特征在于：所述步骤(1)中热镀锌处理液还含有助镀剂；其中，助镀剂的组成为：氯化铝20-25g/L、氯化锌31-35g/L、氯化钾5-6g/L、氟化钠5-8g/L、碳酸氢钠2-5g/L。
4.根据权利要求1所述的一种复合热镀锌钢丝的制备方法，其特征在于：所述步骤(2)中硅烷皮膜剂溶液浓度为1～2％，pH值为8～9。
5.根据权利要求1所述的一种复合热镀锌钢丝的制备方法，其特征在于：所述步骤(3)中钝化层处理液的组成为：由15.0～20.0wt％的环氧树脂、2～5wt％的双氧水、3～6wt％的有机酸和水组成。
6.根据权利要求5所述的一种复合热镀锌钢丝的制备方法，其特征在于：所述有机酸选自柠檬酸、酒石酸、苹果酸、水杨酸、乳酸中的一种或几种。
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