一、電偶腐蝕
1、 Galvanic corrosion
當鋁與其他金屬接觸時，鋁總是處于陽極使其腐蝕加速。電偶腐蝕又稱為雙金屬腐蝕，其腐蝕的嚴重程度是由兩個金屬電位序中的相對位置決定的。鋁型材之間的電位差愈大則電偶腐蝕愈嚴重，幾乎所有鋁合金都不能避免電偶腐蝕。
When aluminum comes into contact with other metals, aluminum is always at the anode to accelerate its corrosion. Galvanic corrosion is also called bimetallic corrosion. The severity of corrosion is determined by the relative position of two metal potential sequences. The greater the potential difference between aluminum profiles, the more serious the galvanic corrosion is. Almost all aluminum alloys can not avoid galvanic corrosion.
二、點腐蝕
2、 Pitting corrosion
點腐蝕又稱為孔腐蝕，是金屬上產生針尖狀，點狀，孔狀的一種極為局部的腐蝕形態。鋁在大氣，淡水以及中性水溶液中都會發生點腐蝕，嚴重的還可以導致穿孔，不過腐蝕量保持一個極限值。
Pitting corrosion, also known as pitting corrosion, is an extremely local corrosion form of needle tip, dot and hole on metal. Aluminum will have point corrosion in the atmosphere, fresh water and neutral aqueous solution, and can also lead to perforation in serious cases, but the corrosion amount remains at a limit value.

三、晶間腐蝕
3、 Intergranular corrosion
晶間腐蝕的原因與熱處理不當有關系，合金化元素或金屬間化合物沿晶界沉淀析出，相對于晶粒是陽極構成腐蝕電池，引起晶間腐蝕加速。
The cause of intergranular corrosion is related to improper heat treatment. Alloying elements or intermetallic compounds precipitate along the grain boundary. Compared with the grain, the anode forms a corrosion battery, causing the acceleration of intergranular corrosion.
四、絲狀腐蝕
4、 Filiform corrosion
絲狀腐蝕是一種膜下腐蝕，這種膜可以使漆膜，也可以使其他圖層，一般不發生在陽極氧化膜下面。鋁型材涂層前都會進行預處理和環境因素有關因素，例如濕度，溫度，氯化物等。
Filiform corrosion is a kind of under film corrosion. This film can make the paint film or other layers, which generally does not occur under the anodic oxide film. Aluminum profile will be pretreated before coating, which is related to environmental factors, such as humidity, temperature, chloride, etc.
五、縫隙腐蝕
5、 Crevice corrosion
鋁型材本身與其他材料的表面接觸時存在縫隙，由于差異充氣電池作用，縫隙內腐蝕加速，而縫隙外沒有影響?？p隙腐蝕與合金類型關系不大，即使非常耐蝕的合金也會產生縫隙腐蝕。
There is a gap between the aluminum profile itself and the surface of other materials. Due to the action of differential inflatable battery, the corrosion in the gap is accelerated, but there is no effect outside the gap. Crevice corrosion has little to do with the type of alloy. Even very corrosion-resistant alloys will produce crevice corrosion.
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