Many diesel generator sets on the market use aluminum water tank materials. We all know that aluminum water tanks have lower thermal conductivity than copper water tanks, so which one has a longer service life? Is the low melting point of aluminum affecting its service life? The melting point of copper is 1084.4 ℃, and the melting point of aluminum is 660.4 ℃. However, due to the inclusion of overheating protection devices in diesel generator sets, this temperature will not be reached at all. On the contrary, high-temperature water plays a decisive role in the lifespan of the water tank.

我們?nèi)粘Ｉ钪械乃皇羌儍羲?，里面含有各種離子，尤其是氯離子的濃度較高，當(dāng)銅與水中的Cl-、SO42-等活性離子接觸時，會在局部產(chǎn)生含有這些活性離子的反應(yīng)生成物并與水生成酸?？諝庵械腟O2、CO2、H2S溶于水中也會降低局部的PH值。侵入銅內(nèi)，就會加速銅的腐蝕，使銅水箱和銅熱水管內(nèi)部產(chǎn)生孔蝕。

The water in our daily lives is not pure water, which contains various ions, especially chloride ions with high concentrations. When copper comes into contact with active ions such as Cl - and SO42- in the water, it will produce reaction products containing these active ions locally and form acids with the water. The dissolution of SO2, CO2, and H2S in the air in water can also reduce local pH values. Invading the copper will accelerate its corrosion, causing pitting corrosion inside the copper water tank and copper hot water pipe.

鋁水箱也不能逃過水的侵蝕，Cl-會破壞鋁的保護膜。Cl-通過鋁表面的細孔或缺陷滲入防護膜，使鋁表面的防護膜呈膠狀而分散，Al2O3保護膜發(fā)生水化作用，變?yōu)樗趸铮贡Ｗo作用下降。而且銅零件被腐蝕后生成的Cu2+更會加速鋁的孔蝕，另外空氣中的SO2被鋁表面的水膜吸附，溶解生成H2SO3(亞硫酸)并與氧作用生成H2SO4腐蝕鋁表面。

Aluminum water tanks cannot escape the erosion of water, as Cl - can damage the protective film of aluminum. Cl - penetrates into the protective film through small pores or defects on the aluminum surface, causing the protective film on the aluminum surface to become colloidal and dispersed. The Al2O3 protective film undergoes hydration and becomes hydrated oxide, reducing its protective effect. Moreover, the Cu2+generated after copper parts are corroded will accelerate the pitting corrosion of aluminum. In addition, SO2 in the air is adsorbed by the water film on the aluminum surface, dissolved to generate H2SO3 (sulfite), and reacts with oxygen to generate H2SO4, which corrodes the aluminum surface.

當(dāng)擴散和穿透力極強的Cl-把鋁保護膜破壞后，SO2-再次與鋁基體接觸，發(fā)生腐蝕。如此循環(huán)，更加重了鋁的腐蝕。由于鋁的腐蝕電位序遠高于銅，所以在水等電解質(zhì)的作用下，鋁與這些金屬接觸時，形成電偶，鋁為陽極，受到電偶腐蝕，會更快的加重鋁的腐蝕。所以鋁水箱在壽命上仍然沒有銅水箱使用壽命長。

When Cl - with extremely strong diffusion and penetration forces destroys the aluminum protective film, SO2- comes into contact with the aluminum substrate again, causing corrosion. This cycle further exacerbates the corrosion of aluminum. Due to the fact that the corrosion potential sequence of aluminum is much higher than that of copper, under the action of electrolytes such as water, when aluminum comes into contact with these metals, a galvanic couple is formed. Aluminum serves as the anode and is subjected to galvanic corrosion, which will accelerate the corrosion of aluminum. So aluminum water tanks still have a longer lifespan than copper water tanks.

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