铝和铝合金的化学转化是铝表面与溶液中的化学氧化剂直接反应形成的。化学转化按其溶液性质可分为碱性和酸性两大类，按其成膜性质可分为氧化膜、磷酸膜、铬酸盐膜和单磷酸铬酸盐膜。所得的膜统称为化学转化膜。
　　The chemical conversion of aluminum and aluminum alloy is formed by the direct reaction of aluminum surface and chemical oxidant in solution. Chemical conversion can be divided into two categories according to its solution properties: basic and acid, and can be divided into oxide film, phosphoric acid film, chromate film and monophosphate chromate film according to its film-forming properties. The resulting membranes are collectively referred to as chemical conversion membranes.

　　化学转化膜被广泛应用，除了起到一般的保护作用外，有些转化膜通过工艺配方获得还具有装饰作用(外观需要涂上清漆)，有些可以提高涂层的结合强度;经过一些化学转化处理后仍能保持原来的导电率，所以这种薄膜又称导电转化膜。
　　Chemical conversion film is widely used. In addition to general protection, some conversion films are also decorative (varnish is required for appearance), and some can improve the bonding strength of the coating. After some chemical conversion treatment, the original conductivity can still be maintained, so this kind of film is also called conductive conversion film.
　　化学转化工艺操作简单，所需设备简单，生产效率高，生产成本低，获得的转化膜应用范围广，具有广阔的应用前景和推广价值的镀膜品种。
　　The chemical conversion process is simple in operation, simple in equipment, high in production efficiency and low in production cost. The obtained conversion film has a wide range of applications, and has a broad application prospect and promotion value.
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