ã€China Aluminum Industry Net】 water-filling disintegration film means that the heat sink in the system suddenly cracks after about 5 to 10 minutes after the hot water heating system starts to charge the water pump. The aluminum alloy radiator is no exception. This phenomenon belongs to the system design problem and should be dealt with in this area. The heating system was reformed accordingly to prevent leakage of tablets. Change in boiler water quality. Daqing City mainly uses low-pressure fuel and gas-fired boilers. The water quality standard is the total hardness material concentration, and the PH value is between 7-12. However, when surveying heating boiler rooms of many users, it was found that the operation of the boiler staff was erroneous and the water quality was poor. Softening is not good, so that the boiler water quality changes abnormally, resulting in aluminum alloy radiator corrosion, leakage. Too much water is added to the boiler water once. The boiler feedwater pH is generally controlled between 815-912. Its purpose is to prevent the corrosion of the water supply system. The second is to react the phosphate and calcium ions in the boiler to reduce the formation of scale. The boiler water supply is generally required to adjust the pH value. With amine or trisodium phosphate. However, in actual practice, the above boiler house uses strong alkali NaOH, and NaOH makes the boiler boiler water PH value down to between 13-14. Under the action of strong alkali, the aluminum alloy radiator is corroded, resulting in leakage. Improper handling of water. The water quality in Daqing is relatively high and must be softened before entering the boiler.
The main chemical composition of aluminum alloys is Al, Mg, Si and other impurities such as Fe and Cu, among which the weight ratio of Mg and Si should be controlled between 113-115. At this time, excellent corrosion resistance and good toughness can be obtained. Intensity, if the Si in the alloy increases, the corrosion resistance of the alloy decreases, and corrosion is likely to occur. If the Fe content of the alloy exceeds the standard, the corrosion resistance of the alloy will also be reduced. For example, the following results are obtained by testing the chemical composition of raw materials of a plant. Chemical composition Element name MgSiFe Target %0145-019012-016<0135 Test result %016201390149 From the test results, Mg and Si were basically satisfied with the requirements of 1158, while the content of Fe exceeded the national standard by 40%, and the content increased, which greatly accelerated the alloy. Corrosion rate. Through the above analysis, it can be concluded that aluminum alloy radiator leakage during use is caused by a combination of factors.
The use of heat sinks should be prevented and improved from the following aspects: The improvement of the hot water heating system, adjusting the relationship between the design condition flow rate at the constant pressure point and the replenishment flow, to prevent the water-supply disintegration film. The PH value of the control heating system is between 8-10. In theory, the aluminum alloy radiator is a product with better corrosion resistance, because the boiler water's PH value is generally between 8-10, and the aluminum alloy is in this value. Between the purely protective state, the aluminum alloy radiator with a thickness of 112mm has a life of 10 years or more without any corrosion protection. Ensure that the chemical composition of aluminum alloy raw materials meets national standards. The aluminum alloy heat sink must do necessary internal anti-corrosion to form a layer of passivation protective film to prevent direct contact with water and other media to avoid leakage corrosion. Through the above-mentioned several aspects of treatment, can effectively prevent the leakage of the radiator, improve the performance of the radiator, so that such radiators can be widely used and promoted by the state and relevant departments.
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