Most electrical appliances will heat up during use, such as televisions, computers, refrigerators, and air conditioners. This requires the use of radiators to quickly dissipate heat. Currently, most radiators are made of aluminum alloy, which consists mainly of aluminum, magnesium, and silicon alloys. They are formed into different radiator aluminum profiles through heating and extrusion, and then welded together in various combinations. It has the advantages of being lightweight, having good thermal conductivity, high pressure resistance, good thermal processing performance, and metal thermal strength reaching above 2.4W/kg°C. Moreover, aluminum alloy radiators are cheaper than those made from other materials, leading to their rapid acceptance in society. Especially in the past year, the development speed has been fast, growing from a dozen to over 70 companies producing aluminum radiators. A considerable number of these companies have small production scales, and their technical processes need further improvement. Currently, most production enterprises have not adopted internal anti-corrosion measures, which will inevitably bring future troubles to the companies and should be taken seriously.
The aluminum profile radiator mainly faces corrosion issues when used in alkaline water quality. According to China's heating water quality standards, for water treatment in boilers, the circulating water at a temperature of 95°C requires a pH of 10 to 12, and the alkalinity of the boiler water should be 8-20 mg equivalent/liter. This regulation aims to control the oxygen content in the feed water to protect the corrosion of pipelines and the boiler body; on the other hand, it helps to convert scaling substances into sediment to extend the boiler's service life. Otherwise, the water quality of the heating system being alkaline far exceeds the safe operating conditions for aluminum radiators.