Alumina, often referred to as " oxy ", is a white amorphous powder, commonly known as Alumina white solid insoluble in water . Odorless . Tasteless. Quality extremely hard . Easy to absorb moisture without deliquescence. Amphoteric oxide Matter , soluble Inorganic acids and alkaline solution, almost insoluble in water and non- polar Organic solvents. Relatively Density (d204) 4.0. Melting point is about 2000 ℃. Since corrosion of material different principles , the aluminum radiator corrosion oxidation ability, but prone to alkali corrosion and chloride ion etching , so that when a water heating system alkaline (PH value above 7 ) , or chlorine ion content is high ( salt volume ) , the radiator there is corrosion leakage risk . Also remind consumers : Because aluminum than other commonly used metal active, prone to electrochemical corrosion , you should avoid mixing with other materials, aluminum radiator installation . Factory aluminum car radiator is put into use only a few days later, perforation occurred leakage. After examination revealed the inner surface of the tube in the radiator more uniform distribution of corrosion pitting , pitting morphology belongs . Pitting holes and the inner surface of the heat pipe EDS analysis were detected chlorine elements, coolant chemical analysis found that high levels of chloride ion , a chloride ion content of the sample even up to 187mg / L. Pitting perforated aluminum radiator leak is due to environmental media using aluminum chloride ions on the surface of the material damage caused by the passivation film ; coolant environmental media is an important source of chloride ions cause analysis radiator leak steel, aluminum heat is in the process of using perforated leakage , for many reasons , can be divided into two aspects: First, the processing of the radiator welding junction quality, the second is the radiator heating system in the mismanagement run . The so-called corrosion, is the material react with the ambient environment , and cause components, system failure occurs , deterioration And call it corrosion failure . Visible, any material or component corrosion damage can be divided into internal reason ( material or component 's own physical and chemical properties ) and external ( member working conditions ) . Lightweight radiator with its unique advantages of rapid development at home and abroad . In China, due to product quality , heating and operation management , and many other reasons, the practical application of the corrosion problems become an obstacle to the development of lightweight radiator key . To this end , efforts from the quality of their products , system operation and management , anti-corrosion coatings and other ways to solve problems, and achieved certain results. As part of the manufacturers and users of various materials radiator corrosion under the operating environment does not understand the reasons , so there have been disputes in use , any adverse impact to the radiator industry .