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孙王杰新虫 (正式写手)
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[交流]
铜合金钝化
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大家好，本人现在遇到这么个情况，复杂黄铜(Cu:89-93%,Sn:0.05-0.5%,P:0.01-0.25%,France:0.15-0.45%,Pb:<=0.03%,余量：锌)在钝化后出现表面偏暗，不够光亮，重复钝化后表面就会变亮，但是放置不到一个月不到的时间，测试会发现导电性能下降，零件温升变高。现在请教这个钝化液的选择和钝化工艺问题，以及黄铜与青铜的钝化液选择有没有区别？ 发自小木虫IOS客户端 |
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dickliu7
铁杆木虫 (著名写手)
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小木虫: 金币+0.5, 给个红包，谢谢回帖
孙王杰: 金币+5, 给了资料，但是未解决实际问题 2018-11-08 09:02:15
小木虫: 金币+0.5, 给个红包，谢谢回帖
孙王杰: 金币+5, 给了资料，但是未解决实际问题 2018-11-08 09:02:15
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Passivation Passivation refers to the process of forming a protective film on metal. The blue-green patina of copper developed during atmospheric exposure of copper alloys is a protective coating that is aesthetically pleasing. The patina may be artificially produced or accelerated by a solution having the formulation: Ammonium sulfate 2.7 kg (6 lb) Copper sulfate 85 g (3 oz) Ammonia (technical grade, 39.6 cm3 (1.34 fl oz) 9.90 sp gr) Water 25 L (6.5 gal) Total solution 27 L (7.3 gal) A fine spray of the solution should be applied to a chemically clean surface. The film should be permitted to dry before the part is sprayed a second time. Five or six repetitions of the spraying and drying sequence are required. The color begins to develop in about 6 h and at first is somewhat bluer than natural patina. A more attractive color develops as the surface is exposed to natural weathering. Small copper parts may be coated with an imitation patina by dipping them in or brushing them with the following solution: Ingredient Parts by weight Copper 30 Nitric acid, concentrated 60 Acetic acid, 6% 600 Ammonium chloride 11 Ammonium hydroxide 20 (technical grade, 0.90 sp gr) When preparing the solution, copper is dissolved in the nitric acid, and as soon as the action ceases, the remaining three constituents are added. The solution is allowed to stand several days before use. Parts treated with this solution are coated with linseed oil. |
2楼2018-11-07 22:14:03
孙王杰
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3楼2018-11-08 09:01:19
孙王杰
新虫 (正式写手)
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4楼2018-11-08 09:01:36
dickliu7
铁杆木虫 (著名写手)
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小木虫: 金币+0.5, 给个红包，谢谢回帖
小木虫: 金币+0.5, 给个红包，谢谢回帖
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我有的資料顯示青銅可以採用Olive Drab Process. http://www.accu-labs.com/Chromat ... /562-Olive-Drab.pdf |
5楼2018-11-08 11:02:28
6楼2019-01-02 21:33:09