鋁和鋁合金的化學轉化是鋁表面與溶液中的化學氧化劑直接反應形成的。化學轉化按其溶液性質可分為堿性和酸性兩大類，按其成膜性質可分為氧化膜、磷酸膜、鉻酸鹽膜和單磷酸鉻酸鹽膜。所得的膜統稱為化學轉化膜。
　　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.

　　化學轉化膜被廣泛應用，除了起到一般的保護作用外，有些轉化膜通過工藝配方獲得還具有裝飾作用(外觀需要涂上清漆)，有些可以提高涂層的結合強度;經過一些化學轉化處理后仍能保持原來的導電率，所以這種薄膜又稱導電轉化膜。
　　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.
　　化學轉化工藝操作簡單，所需設備簡單，生產效率高，生產成本低，獲得的轉化膜應用范圍廣，具有廣闊的應用前景和推廣價值的鍍膜品種。
　　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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