一、概述目前国内汽车发动机的冷却系统大部分仍采用水作为热交换介质。水在4℃时比重最大。O℃结冰时体积膨胀达9%左右,对冷却系统引起的应变往往大于冷却系统材料的弹性应变范围,因而容易造成冷却系统机件的严重损坏,甚至报废,另外,因地区水质的不同,对冷却系金属表面产生不同程度的腐蚀和结垢,从而大大降低冷却效果和使用寿命。 I. Overview At present, most domestic automobile engine cooling system still uses water as the heat exchange medium. Water at 4 ℃, the largest proportion. The volume expansion at 0 ° C is about 9%. The strain caused by the cooling system is often larger than the elastic strain range of the cooling system, which may cause serious damage to the cooling system parts or even scrapped. In addition, due to the difference in water quality, The cooling system of metal surfaces have varying degrees of corrosion and scaling, thereby greatly reducing the cooling effect and service life.