Aluminium and aluminium alloys

Extruded rod/bar, tube and profiles

Part 2: Mechanical properties

This European Standard was approved by CEN on 1997-03-10.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom.

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阳极氧化之后，氧化膜的膜孔中残留有硫酸溶液，因此，染色之前必须将铝制品彻底清洗干净。避免给染色槽带人杂质离子，尤其是磷酸根离子、氟离子等，在染色槽之前设立纯水清洗，并且要对水质进行监控是十分必要的。

阳极氧化的颜色﹕金，黑， 银白，青铜，香槟色, 等等。

铝及铝合金在阳极氧化过程中作为阳极，阴极只起导电作用和析氢反应。常用的电解液为酸性，阳极氧化时，阳极反应首先是水的电解，产生初生态的[O]，初生氧有很强的氧化能力，它与阳极上的铝作用生成氧化铝，并放出大量热。生成的氧化膜在酸性电解液中，产生化学溶解作用，故所形成的氧化膜为多孔结构，由于多孔保证了电解液的流通而使氧化膜不断增厚。其电极反应如下：

阳极 H₂O=[O]+2H⁺+2e

2Al+3[O]=Al₂O₃

阴极 2H⁺+2e=H₂↑

多孔的氧化膜吸附能力强，易于染色，再经封闭处理，就可获得美观、防腐蚀性能良好的氧化膜。