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.

我们日常生活中的水不是纯净水，里面含有各种离子，尤其是氯离子的浓度较高，当铜与水中的Cl-、SO42-等活性离子接触时，会在局部产生含有这些活性离子的反应生成物并与水生成酸。空气中的SO2、CO2、H2S溶于水中也会降低局部的PH值。侵入铜内，就会加速铜的腐蚀，使铜水箱和铜热水管内部产生孔蚀。

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.

铝水箱也不能逃过水的侵蚀，Cl-会破坏铝的保护膜。Cl-通过铝表面的细孔或缺陷渗入防护膜，使铝表面的防护膜呈胶状而分散，Al2O3保护膜发生水化作用，变为水化氧化物，使保护作用下降。而且铜零件被腐蚀后生成的Cu2+更会加速铝的孔蚀，另外空气中的SO2被铝表面的水膜吸附，溶解生成H2SO3(亚硫酸)并与氧作用生成H2SO4腐蚀铝表面。

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.

当扩散和穿透力极强的Cl-把铝保护膜破坏后，SO2-再次与铝基体接触，发生腐蚀。如此循环，更加重了铝的腐蚀。由于铝的腐蚀电位序远高于铜，所以在水等电解质的作用下，铝与这些金属接触时，形成电偶，铝为阳极，受到电偶腐蚀，会更快的加重铝的腐蚀。所以铝水箱在寿命上仍然没有铜水箱使用寿命长。

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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The above is the content introduced by the gas generator set manufacturer to everyone. Thank you for taking the time to check our company's information content http://www.huannengpower.com If you want to learn more, welcome to call for consultation!