With the advent of winter, the temperature gradually decreases. In order to allow the car to continue to be used at low temperatures in winter, some substances that can reduce the freezing point of water are added as antifreeze in the engine coolant to keep the cooling system from freezing in cold weather. According to the survey, more than 50% of global automobile engine failures come from the cooling system! This shows the importance of reasonable selection of antifreeze. Antifreeze has the advantages of anti-corrosion, high boiling point, anti-scaling and low freezing point. Adding appropriate antifreeze to ensure that the working state of the cooling system will directly affect the normal operation of the vehicle and the service life of the vehicle.

At present, most antifreezes sold on the market are products with ethylene glycol as the main raw material, and then appropriate amounts of organic or inorganic salts are added to achieve anti-corrosion and anti-rust effects. Antifreeze is the main component of antifreeze, which accounts for about 92% to 98% of the original antifreeze. The original antifreeze can be mixed with water at a certain ratio according to the temperature of various places to control the freezing point within an appropriate range. Almost all countries in the world have used ethylene glycol as an antifreeze since the 1950s. Ethylene glycol is a colorless, transparent, slightly sweet and hygroscopic viscous liquid that can be dissolved in water in any proportion. When the concentration of ethylene glycol is different. The freezing point is also different.

The freezing point of ethylene glycol-water antifreeze is not linearly related to the mass fraction of ethylene glycol. The freezing point of its aqueous solution does not decrease completely with the increase of concentration. When the concentration exceeds 70%, the freezing point rises instead. Therefore, in the preparation process, reasonable choices should be made from the practical point of view, in order to achieve the requirements of antifreeze and economy, antifreeze preparation. In Jiangnan, China, the proportion of ethylene glycol with a mass fraction of 40% is generally used, while in the cold north, it is more appropriate to use a proportion of ethylene glycol with a mass fraction of about 50%.

$Application of ATAGO Refractometer in Automobile Coolant$

ATAGO specializes in the production of refractometers for more than 70 years and is a leader in refractometers and polarimeters. Its products PAL-91S and PAL-92S mini digital ethylene glycol refractometers are professionally suitable for the measurement of ethylene glycol solutions and display their solution concentration and freezing temperature. Its simple operation, fast display and stable repeatability can better help our users to measure the refrigerant (name: antifreeze refractometer) to ensure the normal operation and service life of the car.

$Application of ATAGO Refractometer in Automobile Coolant$

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Knowledge of inspection and maintenance of automobile cooling system

Pay attention to the following issues when using antifreeze:

1. For vehicles using antifreeze, do not directly add tap water. Distilled or deionized water should be added. If there is no condition, it is better to add cold water than tap water. If antifreeze is lost due to leakage, antifreeze of the same brand should be replenished. The antifreeze should be used in all seasons. The method of using tap water in summer is unscientific, and it is not worth the loss.

2. The metal corrosion inhibitors used in different brands of antifreeze are also different, so different brands of antifreeze cannot be mixed

3. Another key to choosing antifreeze is to ensure safety. The high-grade antifreeze has the functions of anti-corrosion, anti-scaling, anti-boiling, anti-freezing, anti-rust, etc. It can also protect the water tank very well and can be used all year round. The appearance of high-quality antifreeze should be clear and transparent, and have a striking color, no odor, and some inferior antifreezes do not have anti-freezing and preventing boiling functions. Water tanks and pipelines are "bitten" with holes, affecting driving.

4. Some antifreezes will store a small amount of flocculent sediment after one year of storage. This phenomenon is mostly caused by the precipitation of additives, and it does not need to be thrown away. If a large amount of particles precipitate, it indicates that the antifreeze has deteriorated and can no longer be used.

10% of automotive antifreeze products on the market are unqualified:

A few days ago, the Jilin Provincial Administration for Industry and Commerce conducted a special spot check on products sold in major shopping malls, wholesale markets, and some dealers in Changchun and Jilin. A total of 30 batches of automotive antifreeze were drawn, of which 3 products were unqualified. 90%.

Freezing point is an important indicator to measure the eligibility of antifreeze products. Failure to comply with this indicator will cause the product to freeze at low temperatures, which may invalidate the car's water tank and other systems and cause damage to the car; if the PH value is unqualified, it may cause corrosion to the car's circulating water system, and long-term use will damage the car.