Study on different types of car coolant used in Libyan market: additives dropout

الملخص

In this research, the effect of four types of coolants used in the local market, (namely Abrad, Freezetone, Algabl Green, and Algabl Red), on the rate of additive dropout quantity was studied, and the cylinder block alloy of the Chevrolet Optra engine car was used as the study material, The results of the chemical analysis technique show that the investigated material is Al-Si alloy. The cylinders have a rectangular cross-section. The samples were placed inside a glass container for each type of coolant, three samples were used. A sensitive balance was used with an accuracy of 1/10000 to measure the weight of the samples before testing and their weight after the immersion process for different periods of time to calculate the rate of additive dropout in g/h/cm2. Preliminary results showed that the additives were deposited on the samples surfaces in different quantities. In addition, after cleaning the samples with distilled water and drying them, these deposits remained stuck to the samples. Through the results obtained after weighing, it was found that the Algabl green coolant has the lowest rate of sedimentation. The additive dropout quantity was about 0.00000478 g/hr/cm², followed by Freezetone with 0.00000713 g/hr/cm², while the amount of additive dropout with the Abrad type was 0.00002543 g/hr/cm². The additives dropout causing deteriorating cooling system performance, where deposit the additive on cylinder block wall will reduce the transferred heat generated inside composition chambers, cylinder heads and blocks are highly and dynamically loaded structures that transfer a lot of heat, so the choice of coolant type for engine is very important to ensure that engine is operating properly.