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及铝合金表面经铬酸处理液处理后形成的铬酸盐转化膜,不但防腐蚀能力较通常的化学氧化膜好,而且其导电性能也较优越。目前此转化膜生产工艺已被广泛应用于材料涂复前处理、表面防护及波导管生产上。铝及铝合金表面铬酸盐转化膜的各种物化特性均与其组成和结构有关,因此研究此种转化膜的组成和结构具有一定的理论和实际意义。对铝表面铬酸盐转化膜已有过一些研究。一般认为转化膜由三价与六价铬的氧化物组成,具体推测的组分为Cr_2O_3·CrO_3·H_2O或Cr(OH)_3·Cr(OH)CrO_4等,并且多数作者认为转化膜有非晶结构。上述大多数的报道是采用较单一的测试方法测定转化膜的元素成
And chromate conversion coating formed on the surface of aluminum alloy treated by chromic acid treatment solution not only has better anti-corrosion ability than usual chemical oxide film but also has superior electric conductivity. At present, the conversion film production process has been widely used in pre-coating of materials, surface protection and waveguide production. The various physical and chemical properties of chromate conversion coatings on aluminum and aluminum alloy surfaces are related to their composition and structure. Therefore, it is of certain theoretical and practical significance to study the composition and structure of this conversion coating. There have been some studies on chromate conversion coatings on aluminum. It is generally believed that the conversion coating is composed of trivalent and hexavalent chromium oxides. The specific speculated components are Cr 2 O 3 · CrO 3 · H 2 O or Cr (OH) 3 · Cr (OH) CrO 4 and so on, and most authors believe that the conversion film is amorphous structure. Most of the above reports use a single test method to determine the elemental composition of the conversion coating