CN1021580C - 一种强化镀铬的工艺方法 - Google Patents
一种强化镀铬的工艺方法 Download PDFInfo
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- 238000007747 plating Methods 0.000 title claims abstract description 40
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 8
- 239000011651 chromium Substances 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 title abstract description 18
- 238000005728 strengthening Methods 0.000 title abstract 3
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims abstract description 11
- 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 claims abstract description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000011010 flushing procedure Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract 3
- 230000003014 reinforcing effect Effects 0.000 claims description 16
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- 229910052751 metal Inorganic materials 0.000 description 6
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
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- 229910052742 iron Inorganic materials 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- -1 be warmed to 40 °C Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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Abstract
一种强化镀铬的工艺方法,它由零件去油、阴干、酸洗、中和、上挂具绝缘、冲洗、强化镀铬诸工序组成,其特征在于,镀液配比中可大幅度提高铬酸和氟硅酸盐的含量,硫酸含量为1.5-2.0g/l,通电后使镀液产生1.5-3g/l的三价铬。该工艺电镀时的电流密度可高达100A/dm2,高子沉积速度快、光亮、镀层硬度可提高到HRC60-70,镀层直径可提高到1.50-2.00mm,而且镀层附着力强,不脱落。
Description
本发明涉及金属涂复金属的方法,特别是一种强化镀铬的工艺方法。
现有技术中对耐磨零件的修复方法很多,而在高精度零件的修复中用金属涂复金属的方法就相当重要,如采用的刷镀技术、金属喷涂技术及镀铁工艺。目前的刷镀技术只能使镀层直径增大0.20-0.50mm;金属喷涂技术可使涂层直径增加1.5mm左右,但结合力差,容易脱落;而镀铁工艺的镀层硬度差,从而影响了零件的使用寿命。目前的镀铬工艺中,由于其电流密度只能在40-60A/dm2范围,镀层沉积速度慢,镀铬工艺中的电流效率只能达到14%,而且镀层的洛氏硬度仅在40-50HRC,因此约束了金属镀铬工艺的应用范围。
本发明的目的是为了提供一种强化镀铬的工艺方法,通过调整镀液的配方比例,提高了镀层直径,同时保证了镀层的耐磨强度和牢固性,而且电流效率大幅度提高。
本发明的目的是通过以下措施实现:
一种强化镀铬的方法,它由零件去油、阴干、酸洗、中和、上挂具绝缘、冲洗、强化镀铬诸工序组成,其特征在于,强化镀铬镀液中铬酸浓度为300-380g/l,硫酸含量为1.5-2g/l,氟硅酸盐浓度为4.9-8g/l,通电后使镀液产生1.5-3g/l的三价铬。其最好的镀液配比中铬酸浓度为330-360g/l,氟硅酸盐的浓度为5.5-7g/l。氟硅酸盐为电解能力强的氟硅酸钠或氟硅酸钾。由于大幅度提高了催化剂氟硅酸钠的含量,从而可以大幅度提高铬酸的浓度含量,确保了提高镀层厚度的同时其镀层牢固性和耐磨性同时提高。
本发明具有以下优点:由于提高了铬酸、氟硅酸钠的浓度含量,在强化镀铬工艺中工作电流密度可高达100A/dm2,电流效率可提高到22%-23%,节省了大量电能。由于镀层沉积速度快,对镀层的疲劳强度影响很少,能提高工作效率10倍以上,大大提高了另件的硬度和耐磨性,零件镀层硬度可高达HRC60-70,比普通镀铬零件寿命提高8-10倍,零件镀层直径可提高1.50-2.00mm。而且镀层与零件的附着力强,不易脱落。
附图描述了本发明的实施例:
图:强化镀铬的工艺流程图。
下面结合附图对本发明进行详细描述:
实施例1:
一、零件处理:
1、去油:首先用甲苯将零件上的油污清除。
2、阴干:通过自然阴干或用回丝揩干。
3、酸洗:用盐酸对零件进行酸洗,清除氧化物为止。
4、中和:用10%氢氧化钠溶液中和多余的盐酸。
5、装挂具绝缘:对非镀部位用聚氯乙烯薄膜绝缘,并对零件装上挂具。
6、冲洗:用冷水冲洗干净。
二、镀液的配制:
将镀槽加适量体积水,加温到40℃,将铬酸溶于镀槽,使其充分溶解,调至铬酸浓度为300g/l为止,取样分析硫酸根含量,加入纯硫酸,调至浓度为1.5-2.0g/l。将氟硅酸钠溶于溶液中,调至浓度为4.9g/l。
新配制镀液必须通电处理,使其产生1.5-3g/l的三价格。通电时阴极用不锈钢板,阳极用铅板,阴极面积为阳极面积的4-8倍,阴极电流密度控制在8-12A/dm2,温度控制在55°-60℃,取样分析三价铬含量为1.5-3g/l时为止。
三、将处理好的零件放入镀液中,预热至镀液温度,根据镀件面积大小,调整电流密度不大于
100A/dm2进行强化镀铬。即可达到满意的效果。
实施例2:按照实施例1的步骤,将镀液配方调整为铬酸浓度含量为340-350g/l,氟硅酸钠含量为6.4-6.7g/l进行强化镀铬,可达到满意的效果。
实施例3:按照实施例1的步骤,将镀液配比调整为铬酸浓度含量为380g/l,氟硅酸纳含量为8g/l,进行强化镀铬,可达到满意的效果。
Claims (3)
1、一种强化镀铬的工艺方法,它由零件去油、阴干、酸洗、中和、上挂具绝缘、冲洗、强化镀铬诸工序组成,其特征在于,所用镀液中铬酸浓度为300-380g/1,硫酸含量为1.5-2.0g/1,氟硅酸盐浓度为4.9-8g/1,通电处理后使镀液产生1.5-3g/1的三价铬。
2、根据权利要求1所述的一种强化镀铬的工艺方法,其特征在于,强化镀铬液中铬酸浓度为330-360g/l,氟硅酸盐浓度为5.5-7g/l。
3、根据权利要求1、2所述的一种强化镀铬的工艺方法,其特征在于,氟硅酸盐为氟硅酸钠或氟硅酸钾。
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CN 91106417 CN1021580C (zh) | 1991-05-17 | 1991-05-17 | 一种强化镀铬的工艺方法 |
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CN 91106417 CN1021580C (zh) | 1991-05-17 | 1991-05-17 | 一种强化镀铬的工艺方法 |
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CN1060881A CN1060881A (zh) | 1992-05-06 |
CN1021580C true CN1021580C (zh) | 1993-07-14 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1318650C (zh) * | 2002-11-19 | 2007-05-30 | 深圳富泰宏精密工业有限公司 | 转轴座加工方法 |
CN102002738A (zh) * | 2010-12-15 | 2011-04-06 | 安徽华东光电技术研究所 | 一种在无氧铜基体上镀黑铬的镀液配方及电镀方法 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3983194B2 (ja) | 2003-04-01 | 2007-09-26 | トヨタ自動車株式会社 | プレス成形用金型 |
CN103122470B (zh) * | 2011-11-17 | 2015-12-09 | 符士正 | 汽车铸铁模具镀液 |
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- 1991-05-17 CN CN 91106417 patent/CN1021580C/zh not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN1318650C (zh) * | 2002-11-19 | 2007-05-30 | 深圳富泰宏精密工业有限公司 | 转轴座加工方法 |
CN102002738A (zh) * | 2010-12-15 | 2011-04-06 | 安徽华东光电技术研究所 | 一种在无氧铜基体上镀黑铬的镀液配方及电镀方法 |
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