The reasons for the blackening of aluminum alloy die castings in Shandong are as follows:
1. The unscientific technology and carelessness of aluminum alloy die castings after cleaning or pressure inspection set the standard for moldy and blackening of castings and accelerated the transformation of moldy parts into moldy ones.
2. Due to the untimely logistics and storage management, the mould growth of aluminum alloy die castings is not the same when they are stored in the warehouse with different aspect ratio.
3. The internal elements of aluminum alloy profiles, many die-casting manufacturers in the aluminum die-casting, machining process, do not do cleaning solution, or simple tap water cleaning, can not ensure clean, die-casting aluminum surface residual film remover, cutting oil, saponification liquid and other corrosive chemicals and other dirt, this kind of dirt accelerated the aluminum alloy die-casting long mildew black rate.
4. Aluminum is a kind of bright metal material, which is easy to become black or mildew under the standard of temperature and humidity.
5. It is not suitable to use cleaning agent. The cleaning agent used has strong corrosion, which leads to corrosion and air oxidation of die casting aluminum.
There are many die casting factories in the production of aluminum alloy die castings at that time, due to the neglect of many key points, the aluminum alloy die castings become black, which can only create a good storage standard. The problem of cleaning, drying and blackening in time can be solved quickly.
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