WO2017028438A1 - 一种具有憎水表面性能的金属镀后无铬钝化剂 - Google Patents

一种具有憎水表面性能的金属镀后无铬钝化剂 Download PDF

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WO2017028438A1
WO2017028438A1 PCT/CN2015/098426 CN2015098426W WO2017028438A1 WO 2017028438 A1 WO2017028438 A1 WO 2017028438A1 CN 2015098426 W CN2015098426 W CN 2015098426W WO 2017028438 A1 WO2017028438 A1 WO 2017028438A1
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agent
metal
passivating agent
hydrophobic surface
plated
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PCT/CN2015/098426
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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
    • C23C22/60—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 alkaline aqueous solutions with pH greater than 8

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  • the invention relates to a protective agent after metal surface plating and a using method thereof, in particular to a metal-plated chromium-free passivating agent having hydrophobic surface properties.
  • the conventional passivation treatment method generally adopts the oxidizing property of hexavalent or trivalent chromium ions to form a dense oxide film on the surface of the plating layer, that is, a passivation film, which can prevent the metal from coming into contact with corrosive medium such as water and oxygen in the air. Thereby achieving the anti-corrosion effect. Since chromium ions are extremely harmful to the environment and the human body, their use is limited. In January 2003, with the adoption of the ROHS Directive prohibiting the use of chromate passivated galvanized steel sheets in electrical and electronic products exported to the European Union, other countries and regions have followed suit to introduce corresponding laws and regulations.
  • inorganic passivation mainly uses strong oxidizing properties of high-valent metal salts (such as molybdate, tungstate, silicate, etc.) to form a dense oxide film on the surface of the metal plating layer.
  • high-valent metal salts such as molybdate, tungstate, silicate, etc.
  • the present invention provides a metal plated passivating agent having hydrophobic surface properties.
  • a first object of the present invention is to provide a metal-plated chromium-free passivating agent having hydrophobic surface properties, and a hydrophobic film forming a passivation film on the surface of the metal after plating, which has anti-corrosion and self-cleaning effects.
  • a metal-plated chromium-free passivating agent having hydrophobic surface properties comprising a silicate having a content of 0.5-30 g/L, a nano material having a content of 0.01-1 g/L, and a content of 0.1-10 g/L. At least one of a silane coupling agent, a titanate coupling agent, and an aqueous wax emulsion.
  • the passivating agent further comprises at least one of an antifoaming agent, a dispersing agent and a penetrating agent.
  • the nano material comprises at least one of nano titanium dioxide and nano silicon dioxide, and the nano titanium dioxide and nano silicon dioxide have a particle size ranging from 10 to 100 nm.
  • the pH of the passivating agent is adjusted by an acid base, and the pH is 9.0-12.0.
  • the silane coupling agent is methyltrimethoxysilane, ⁇ -aminopropyltriethoxysilane, N-( ⁇ -aminoethyl)- ⁇ -aminopropyltrimethoxysilane, 3- At least one of glycidyloxypropyltrimethoxysilane and cationic styrylaminofunctional silane.
  • the titanate coupling agent is at least one of an alcohol amine titanate and a chelating phosphate titanium coupling agent of a polyactive group.
  • the type of the aqueous wax emulsion is at least one of E-842N, E-7025, E-840N, D-838, and E-846.
  • a second object of the present invention is to provide a method for passivating a plated metal using a metal-plated chromium-free passivating agent having a hydrophobic surface property, comprising the steps of:
  • the surface of the metal treated in the step (1) is completely contacted with the passivating agent at room temperature to 80 ° C for 5 seconds to 180 seconds, and dried.
  • the surface treatment in the step (1) is a conventional treatment method in the technical field, or a combination of a plurality of methods; and the contacting in the step (2) is at least one of a soaking, spraying, rolling or brushing method. .
  • the present invention does not contain chromium in any valence state, does not contain cadmium, lead and mercury, does not contain polybrominated biphenyl, does not contain compounds such as polybrominated diphenyl ether, and fundamentally solves the environmental pollution caused by the chromium passivation process. problem.
  • the metal-plated chromium-free passivating agent having hydrophobic surface properties forms a passivation film on the metal surface after plating, thereby preventing metal from coming into contact with corrosive medium such as water and oxygen in the air, thereby Achieve anti-corrosion purposes;
  • the passivating agent of the invention can form a hydrophobic film on the surface of the metal after plating, and has the hydrophobic surface property, so that it is not wetted by water when it is in contact with water, thereby preventing corrosion of metal caused by water, so that It can further improve its corrosion resistance.
  • the invention has simple preparation, wide raw material cost, convenient use and wide application prospect.
  • Deionization agent with a sodium silicate concentration of 0.5 g/L, a methyltrimethoxysilane coupling agent concentration of 0.1-0.5 g/L, and a nano-titanium dioxide concentration of 0.2 g/L was prepared with deionized water to adjust the pH to 12 , Passivation agent 1 was obtained.
  • the concentration of sodium silicate is 5g/L with deionized water
  • the concentration of methyltrimethoxysilane coupling agent and alcohol amine titanate coupling agent is 0.8-1.2g/L
  • the concentration of silicone antifoaming agent is 2g/ L
  • a nano-titanium dioxide and a nano-silica having a concentration of 0.01 g/L of a passivating agent adjusted to a pH of 10 to obtain a passivating agent 2.
  • the concentration of lithium silicate is 15g/L with deionized water
  • the concentration of ⁇ -aminopropyltriethoxysilane coupling agent and alcohol amine titanate coupling agent is 2-5g/L
  • the concentration of nano-silica is 0.5 g/L
  • a silicone antifoaming agent and a passivating agent having a C7-9 alcohol polyoxyethylene ether penetrant concentration of 3 g/L, and a pH of 10 was adjusted to obtain a passivating agent 3.
  • the concentration of sodium silicate was 20g/L with deionized water, the concentration of N-( ⁇ -aminoethyl)- ⁇ -aminopropyltrimethoxysilane coupling agent was 8g/L, and the concentration of nano-silica was 0.6g. /L, a passivating agent having a silicone defoamer concentration of 6 g/L, adjusted to a pH of 9, and a passivating agent 4 was obtained.
  • the concentration of sodium silicate was 30g/L with deionized water, the concentration of nano-silica was 0.8g/L, the concentration of 3-glycidyloxypropyltrimethoxysilane coupling agent was 10g/L, and the silicone defoaming A passivating agent having a dispersant concentration of 10 g/L was adjusted to a pH of 9, and a passivating agent 5 was obtained.
  • the concentration of sodium silicate was 20g/L with deionized water, the concentration of nano-silica was 0.4g/L, the concentration of methyltrimethoxysilane coupling agent and aqueous wax emulsion E-7025 was 5g/L, C7-9
  • a passivating agent having an alcohol polyoxyethylene ether penetrant concentration of 4 g/L was adjusted to have a pH of 10 to obtain a passivating agent 6.
  • the concentration of sodium silicate was 25g/L with deionized water, the concentration of nano titanium dioxide was 1g/L, the concentration of E-842N was 4g/L, and the concentration of C7-9 alcohol ethoxylate was 5g/L.
  • the passivating agent was adjusted to a pH of 10 to obtain a passivating agent 7.
  • the concentration of sodium silicate is 25g/L with deionized water
  • the concentration of nano silica is 0.5g/L
  • the concentration of alcohol amine titanate coupling agent and methyltrimethoxysilane coupling agent is 5g/L
  • the wax emulsion E-840N concentration was 3 g/L
  • the silicone antifoaming agent and the C7-9 alcohol polyoxyethylene ether penetrant concentration of 4 g/L of passivating agent were adjusted to pH 9, and a passivating agent 8 was obtained.
  • the concentration of sodium silicate is 20g/L with deionized water, the concentration of nano-silica is 0.7g/L, and the concentration of chelating phosphate titanium coupling agent with multiple reactive groups is 8-9g/L, C7-9
  • a passivating agent having an alcohol polyoxyethylene ether penetrant concentration of 4 g/L was adjusted to have a pH of 9, and a passivating agent 9 was obtained.
  • the concentration of sodium silicate is 20g/L
  • the concentration of nano-silica is 0.7g/L
  • the concentration of ⁇ -aminopropyltriethoxysilane is 4g/L
  • water-based wax emulsion D-838 and water-based wax.
  • the emulsion E-846 concentration was 5 g/L
  • the silicone antifoaming agent was 6 g/L of a passivating agent
  • the pH was adjusted to 9, and a passivating agent 10 was obtained.
  • NMS neutral salt spray corrosion test
  • the sample is passivated with passivation agent 1-10, and the passivated sample is placed in a salt spray box.
  • the concentration is 5%
  • the pH is 6.5-7.2
  • the temperature is 35 ⁇ .
  • Continuous spraying was carried out on a NaCl solution at 2 ° C. The area of white rust on the surface of the sample at the end of the experiment was observed, and the percentage of white rust on the surface of the sample was calculated to evaluate the corrosion resistance of the sample.
  • the passivated sample 1-10 was placed in a constant temperature oven at 300 ° C for 20 minutes and then taken out.
  • the surface of the sample was free of red rust and cracks, indicating good high temperature resistance.
  • the passivation plated by the embodiment of the present invention has good corrosion resistance and self-cleaning performance.
  • the passivating agent of the present invention does not contain any valence chromium, does not contain cadmium, lead, and mercury, and does not.
  • Compounds containing polybrominated biphenyls and no environmentally friendly compounds such as polybrominated diphenyl ethers are environmentally friendly; the process is simple, the raw materials are wide and the cost is low, and the application is widely used.

Abstract

一种具有憎水表面性能的金属镀后无铬钝化剂，包括含量为0.5-30g/L的硅酸盐、含量为0.01-1g/L的纳米材料，以及含量为0.1-10g/L的硅烷偶联剂、钛酸酯偶联剂和水性蜡乳液中的至少一种。以及一种使用钝化剂对镀后金属进行钝化的方法。

Description

一种具有憎水表面性能的金属镀后无铬钝化剂 技术领域
本发明涉及金属表面镀后的保护剂及其使用方法，尤其涉及一种具有憎水表面性能的金属镀后无铬钝化剂。
背景技术
金属镀后，通常要对其进行钝化处理，以提高其耐蚀能力。传统的钝化处理方法，通常采用六价或三价的铬离子的氧化性在镀层表面形成致密的氧化膜，即钝化膜，该膜能防止金属与空气中水、氧气等腐蚀介质接触，从而使达到防腐蚀的作用。由于铬离子对环境和人体均有极大的危害，其使用受到限制。2003年1月，随着欧盟规定出口到欧盟的电子电器产品中禁止使用铬酸盐钝化的镀锌钢板的ROHS指令的通过，其他国家和地区也纷纷仿效出台了相应的法令、法规。
目前，相关研究人员都在研究替代铬酸盐的产品，大致分为三类：无机钝化、有机钝化和无机有机混合钝化。其中无机钝化主要采用高价金属盐(如钼酸盐、钨酸盐、硅酸盐等)的强氧化性，在金属镀层表面形成致密氧化膜。
为了进一步提高耐蚀性，防止金属与空气中水接触，本发明提供了一种具有憎水表面性能的金属镀后钝化剂。
发明内容
本发明的第一个目的是提供了一种具有憎水表面性能的金属镀后无铬钝化剂，在镀后金属表面形成钝化膜的疏水膜，具有防腐蚀和自清洁作用。
为了实现上述技术方案，本发明采用的技术方案如下：
一种具有憎水表面性能的金属镀后无铬钝化剂，包括含量为0.5-30g/L的硅酸盐、含量为0.01-1g/L的纳米材料，以及含量为0.1-10g/L的硅烷偶联剂、钛酸酯偶联剂和水性蜡乳液中的至少一种。
优选的：所述钝化剂还包括消泡剂、分散剂、渗透剂中的至少一种。
优选的：所述纳米材料包括纳米二氧化钛、纳米二氧化硅中的至少一种，所述纳米二氧化钛、纳米二氧化硅的微粒尺寸范围在10-100nm。
优选的：所述钝化剂的pH值由酸碱来调节，其pH值为9.0-12.0。
优选的：所述硅烷偶联剂为甲基三甲氧基硅烷、γ―氨丙基三乙氧基硅烷、N-(β－氨乙基)-α-氨丙基三甲氧基硅烷、3-缩水甘油醚氧丙基三甲氧基硅烷、阳离子苯乙烯基氨基官能硅烷中的至少一种。
优选的：所述钛酸酯偶联剂为醇胺钛酸酯、多活性基团的螯合型磷酸酯钛偶联剂中的至少一种。
优选的：所述水性蜡乳液的型号为E-842N、E-7025、E-840N、D-838、E-846中的至少一种。
本发明的第二个目的是提供了一种利用具有憎水表面性能的金属镀后无铬钝化剂对镀后金属进行钝化的方法，包括以下步骤：
(1)对镀后金属进行表面处理；
(2)在室温～80℃，经过步骤(1)处理的金属表面与所述钝化剂完全接触5秒～180秒，干燥。其中，步骤(1)所述表面处理为所述技术领域常规处理方法，或多种方法结合处理；步骤(2)所述接触为浸泡、喷淋、辊涂或刷涂方法中的至少一种。
本发明的有益效果：
(1)本发明不含任何价态的铬，不含镉铅汞，不含多溴联苯，不含多溴二苯醚等污染环境的化合物，从根本上解决了含铬钝化工艺对环境的污染问题。
(2)本发明所述的具有憎水表面性能的金属镀后无铬钝化剂，在镀后金属表面形成钝化膜，能防止金属与空气中水、氧气等腐蚀介质接触，从而使其达到防腐蚀的目的； 另外本发明所述的钝化剂能够在镀后金属表面形成憎水膜，具有憎水表面性能，使其与水接触时不被水润湿，从而防止因水引起的对金属的腐蚀，以便能够进一步提高其耐蚀性。
(3)经所述钝化剂处理后的镀锌、铝、镍、锡等各种单一金属镀层或复合金属表面镀层，其具有的良好憎水疏水功能，能产生仿荷叶效应，因此其表面具有自清洁功能，不易沾灰，而且很容易被水冲刷干净，能长期保持镀件表面的光洁度和原有色泽。
(4)本发明制备简单，原料广泛成本低，使用方便，具有广泛应用的前景。
具体实施方式
实施例1
用去离子水配制硅酸钠浓度为0.5g/L，甲基三甲氧基硅烷偶联剂浓度为0.1-0.5g/L，纳米二氧化钛浓度为0.2g/L的钝化剂，调节pH为12，得到钝化剂1。
实施例2
用去离子水配制硅酸钠浓度为5g/L，甲基三甲氧基硅烷偶联剂和醇胺钛酸酯偶联剂浓度为0.8-1.2g/L，有机硅消泡剂浓度为2g/L，纳米二氧化钛和纳米二氧化硅浓度为0.01g/L的钝化剂，调节pH为10，得到钝化剂2。
实施例3
用去离子水配制硅酸锂浓度为15g/L，γ―氨丙基三乙氧基硅烷偶联剂和醇胺钛酸酯偶联剂浓度为2-5g/L，纳米二氧化硅浓度为0.5g/L，有机硅消泡剂和C7-9醇聚氧乙烯醚渗透剂浓度为3g/L的钝化剂，调节pH为10，得到钝化剂3。
实施例4
用去离子水配制硅酸钠浓度为20g/L，N-(β－氨乙基)-α-氨丙基三甲氧基硅烷偶联剂浓度为8g/L，纳米二氧化硅浓度为0.6g/L，有机硅消泡剂浓度为6g/L的钝化剂，调节pH为9，得到钝化剂4。
实施例5
用去离子水配制硅酸钠浓度为30g/L，纳米二氧化硅浓度为0.8g/L，3-缩水甘油醚氧丙基三甲氧基硅烷偶联剂浓度为10g/L，有机硅消泡剂分散剂浓度为10g/L的钝化剂，调节pH为9，得到钝化剂5。
实施例6
用去离子水配制硅酸钠浓度为20g/L，纳米二氧化硅浓度为0.4g/L，甲基三甲氧基硅烷偶联剂和水性蜡乳液E-7025浓度为5g/L，C7-9醇聚氧乙烯醚渗透剂浓度为4g/L的钝化剂，调节pH为10，得到钝化剂6。
实施例7
用去离子水配制硅酸钠浓度为25g/L，纳米二氧化钛浓度为1g/L，水性蜡乳液E-842N浓度为4g/L，C7-9醇聚氧乙烯醚渗透剂浓度为5g/L的钝化剂，调节pH为10，得到钝化剂7。
实施例8
用去离子水配制硅酸钠浓度为25g/L，纳米二氧化硅浓度为0.5g/L，醇胺钛酸酯偶联剂和甲基三甲氧基硅烷偶联剂浓度为5g/L，水性蜡乳液E-840N浓度为3g/L，有机硅消泡剂和C7-9醇聚氧乙烯醚渗透剂浓度为4g/L的钝化剂，调节pH为9，得到钝化剂8。
实施例9
用去离子水配制硅酸钠浓度为20g/L，纳米二氧化硅浓度为0.7g/L，多活性基团的螯合型磷酸酯钛偶联剂浓度为8-9g/L，C7-9醇聚氧乙烯醚渗透剂浓度为4g/L的钝化剂，调节pH为9，得到钝化剂9。
实施例10
用去离子水配制硅酸钠浓度为20g/L，纳米二氧化硅浓度为0.7g/L，γ―氨丙基三乙氧基硅烷浓度为4g/L，水性蜡乳液D-838和水性蜡乳液E-846浓度为5g/L，有机硅消泡剂为6g/L的钝化剂，调节pH为9，得到钝化剂10。
为了证明本发明实施例的性能，对上述实施例进行中性盐雾腐蚀试验(NNS)，试验步骤如下：
采用钝化剂1-10对试样进行钝化，经钝化后的试样放在盐雾箱中，参照ISO3768的标准，采用浓度为5％、pH值为6.5-7.2、温度为35±2℃的NaCl溶液进行连续喷雾，观察实验结束时试样表面出现白锈的面积，计算试样表面白锈的百分比，评价试样的耐腐蚀性能。
以经热镀锌后的金属作为试样，测试结果下表所示：
Figure PCTCN2015098426-appb-000001
另外，将钝化剂1-10钝化后的试样放入300℃的恒温烤箱中连续烘烤20min后取出，试样表面无红锈、龟裂，说明具有良好的耐高温性能。
综上所述，采用本发明实施例进行钝化的镀品具有良好的耐腐蚀性能和自清洁性能，本发明所述的钝化剂不含任何价态的铬，不含镉铅汞，不含多溴联苯，不含多溴二苯醚等污染环境的化合物，对环境友好；且工艺简单，原料广泛且成本低廉，具有广泛应用的前景。

Claims (10)

  1. 一种具有憎水表面性能的金属镀后无铬钝化剂，包括含量为0.5-30g/L的硅酸盐、含量为0.01-1g/L的纳米材料，以及含量为0.1-10g/L的硅烷偶联剂、钛酸酯偶联剂和水性蜡乳液中的至少一种。
  2. 根据权利要求1所述的具有憎水表面性能的金属镀后无铬钝化剂，其特征在于：所述钝化剂还包括消泡剂、分散剂、渗透剂中的至少一种。
  3. 根据权利要求1所述的具有憎水表面性能的金属镀后无铬钝化剂，其特征在于：所述纳米材料包括纳米二氧化钛、纳米二氧化硅中的至少一种，所述纳米二氧化钛、纳米二氧化硅的微粒尺寸范围在10-100nm。
  4. 根据权利要求1所述的具有憎水表面性能的金属镀后无铬钝化剂，其特征在于：所述钝化剂的pH值由酸碱来调节，其pH值为9.0-12.0。
  5. 根据权利要求1所述的具有憎水表面性能的金属镀后无铬钝化剂，其特征在于：所述硅烷偶联剂为甲基三甲氧基硅烷、γ―氨丙基三乙氧基硅烷、N-(β－氨乙基)-α-氨丙基三甲氧基硅烷、3-缩水甘油醚氧丙基三甲氧基硅烷、阳离子苯乙烯基氨基官能硅烷中的至少一种。
  6. 根据权利要求1所述的具有憎水表面性能的金属镀后无铬钝化剂，其特征在于：所述钛酸酯偶联剂为醇胺钛酸酯，多活性基团的螯合型磷酸酯钛偶联剂中的至少一种。
  7. 根据权利要求1所述的具有憎水表面性能的金属镀后无铬钝化剂，其特征在于：所述水性蜡乳液的型号为E-842N、E-7025、E-840N、D-838、E-846中的至少一种。
  8. 一种使用权利要求1-7任一权利要求所述的钝化剂对镀后金属进行钝化的方法，包括以下步骤：
    (1)对镀后金属进行表面处理；
    (2)在室温～80℃，经过步骤(1)处理的金属表面与所述钝化剂完全接触5秒～180秒，干燥。
  9. 根据权利要求8所述的方法，其特征在于：步骤(1)所述表面处理为所述技术领域常规处理方法，或多种方法结合处理。
  10. 根据权利要求8所述的方法，其特征在于：步骤(2)所述接触为浸泡、喷淋、辊涂或刷涂方法中的至少一种。
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