How to choose aluminum cleaning agent?


Release time:

2019-11-18

In recent years, in the production process of aluminum and aluminum alloy plates and foils, in order to continuously improve the metallurgical quality, dimensional tolerance, surface finish and flatness, mechanical properties and other quality indicators to meet the needs of the market, in the melt purification, plate control, heat treatment equipment and the final finishing process have made a lot of investment, but also achieved good results. With the fierce market competition, users put forward higher requirements for product surface quality. Such as annealing macula, residual cold rolling oil, especially a large number of residual aluminum powder on the surface of the electronic foil coating plate and aluminum-plastic composite pipe, composite plate and other products have a great impact on the quality. Therefore, in the aluminum processing industry, more and more attention has been paid to the surface cleaning process of aluminum materials in recent years.
1. Water cleaning technology Water cleaning is to use water as a cleaning fluid, and the cleaning process usually includes three stages: high-pressure cleaning-low-pressure cleaning-drying. Since water and oil are mutually exclusive, to destroy the cold-rolled oil film on the plate surface, it is usually necessary to heat the water temperature to 70 ~ 80C. The water can be recycled after treatment. During the working process, the water temperature will continue to decrease, and it needs to be continuously heated. In order to reduce heat loss, the pipes and water tanks are usually insulated. The size and length of the drying furnace power depends on the speed of the machine column. The higher the speed of the machine column, the greater the power of the oven and the longer the furnace body.
In order to improve the speed of the train and save energy consumption, some manufacturers have made innovations in water cleaning equipment, canceling the high-pressure cleaning part and adopting the process route of degreasing-cleaning-rinsing-squeezing-drying-vacuum roller drying-drying. In this process, degreasing is to heat the water temperature to 5060C, and add degreasing agent to spray and scrub the plate surface according to a certain proportion, so as to destroy the cold emulsifiable concentrate film remaining on the aluminum plate, and then prepare for removing the aluminum powder on the plate surface. Cleaning is to scrub both sides of the aluminum plate with a brush roller. The water temperature at this time is normal temperature, and the main function is to remove aluminum powder. Rinsing is to rinse the plate surface with clear water at a temperature of 7080°C to wash away the aluminum powder being brushed, and at the same time preheat the aluminum plate to provide conditions for drying. The key to this process innovation is the addition of a vacuum suction roll between the extrusion roll and the oven inlet. Because the squeezing roller can only block the large amount of water brought by the board surface during the cleaning process.
Since the squeezing roller itself does not absorb water, there is still a lot of water on the plate surface after the plate passes through the squeezing roller. Under the condition that the machine line speed is very fast, the only way to dry the plate surface is to increase the power and increase the furnace body. The addition of vacuum roller just makes up for this defect. The hydrophilicity of the roller surface is used to absorb the residual water on the plate surface, and the water absorbed by the roller surface is pumped away by the vacuum system, this greatly reduces the burden of the oven. In the treatment of water, new technology is also used to filter the aluminum powder in the water very clean, thus ensuring the cleanliness of the circulating water.
The installed capacity of the water cleaning system is large, generally about 500kw, the organization is relatively large, the area is large, and the length of the online route is about 912 meters. Generally, the system is added to the bending and straightening machine train when a new project is launched. The water cleaning process is shown in.
2 Oil cleaning technology It is a good method to clean the surface of aluminum plate and foil with oil. In Japan, oil cleaning technology was widely used in the 1980 s. Oil cleaning is a special cleaning oil as a cleaning fluid, because cleaning oil and cold emulsifiable concentrate are the same type of products, there is affinity between them, so it is much easier to use oil to wash oil than water to wash oil. The board surface cleaned with oil looks clean and bright, and a layer of extremely thin clean oil film is left on the board surface, which has a protective effect on avoiding scratches and oxidation on the board surface.
The structural design of the oil cleaning machine is very compact, and the position occupied by the process route is only about 1.31.5 meters. Its working principle is shown in.
Oil cleaning equipment consists of three parts, namely cleaning system, filtration system and vacuum system.
The cleaning system is mainly to spray and scrub the surface of the aluminum plate to remove a large amount of aluminum powder and residual cold emulsifiable concentrate generated on the plate surface during the cold rolling process, so that the surface of the aluminum plate is clean and bright. The cleaning oil used in the cleaning process is returned to the dirty oil pool and reused after treatment.
The filtration system is to treat the used dirty oil for reuse. The working principle of the filtering device is similar to that of the cold emulsifiable concentrate filtering system, and the filter aid is also added when filtering. In this way, the treated dirty oil is clear and transparent without aluminum powder, thus ensuring the recycling of the cleaning oil.
7 Powder metallurgy method The method of powder metallurgy is used to prepare Al/TiC metal matrix composites for the refinement of aluminum and aluminum alloys. Al powder and Ti, C powder as raw materials, raw material powder according to the design of the composition percentage in the mixer dry mixed evenly, and then the mixture in the steel mold cold pressure into a certain relative density of the pre-blank block, in vacuum or inert gas under the protection of sintering furnace sintering to obtain the finished blank block.