Smoke-free mirror polishing technology for aluminum alloy profiles

1. The technical characteristics and advantages of aluminum alloy profiles such as alloy aluminum plates

(1) Technical characteristics of aluminum alloy profiles such as alloy aluminum plates: smoke-free mirror polishing has the characteristics of no yellow smoke, no flow marks, low cost, low consumption, low equipment investment, high brightness, high non-disorder, high efficacy, high yield and other characteristics, breaking through the bottleneck and defects of traditional polishing technology, and successfully realizing the large-scale production of 11-meter long chemical polishing and automatic line chemical polishing. Smokeless mirror polishing technology is an advanced technology of ordinary triacid and electrolytic polishing, and is the development direction of chemical polishing technology of aluminum alloy profiles such as alloy aluminum plates.

(2) The technical advantages of aluminum alloy profiles such as alloy aluminum plates are as follows:

No yellow smoke: smoke-free mirror polishing fundamentally solves the frustration of a large amount of yellow smoke produced by three-acid polishing. It can save a lot of environmental protection treatment costs. It clears the main obstacle for the widespread use of chemical polishing.

No flow marks: The smokeless polishing technology completely solves the frustration of polishing flow marks, and realizes the full-automatic line scale production of 11 meters of polished materials, making the polishing as easy to manipulate as alkali etching.

High brightness: Because of the use of new polishing ingredients, smokeless polishing is 20%~30% brighter than three-acid polishing and electrolytic polishing, which is the highest brightness polishing technology at present.

Low consumption: The consumption of smokeless mirror polishing agent can be reduced by 60%-70% compared with the consumption of electrolytic polishing (500-700kg/t material).

High yield: There are almost no defects in the process of smoke-free mirror polishing, and the product yield is extremely high.

High production efficiency: smoke-free polishing and large accumulation, each time can polish multiple rows; There is no waste in polishing, and the production efficiency is at least 2 times that of three-acid polishing and 6-9 times that of electrolytic polishing.

The tank liquid is not messy: the smoke-free mirror polishing tank is almost not adjusted, and it can work for a long time without messing. It has paved the way for the large-scale industrialization and automated production of chemically polished aluminum.

The brightness is not messy: different batches of polished materials are produced, because the grooves are not adjusted, and the brightness of the polished materials produced is not messy.

Second, the process and the key points of manipulation analysis

(1) Slot setting instructions:

In front of the smokeless mirror polishing groove is a completely blocked exhaust wall, which eliminates the external natural wind and reduces the exhaust efficiency, which is conducive to all-weather production on rainy days and dense foggy days.

The width of the smoke-free mirror polishing tank is more than 1.6m, which strengthens the buffering ability of the tank liquid to absorb smoke, which is conducive to large-scale mass production.

(2) Tank function description:

Dewax and descaling tank: This tank contains a new type of weak alkaline dewaxing and descaling agent, which can remove mechanical polishing wax and residual heavy oil scale, and does not erode aluminum alloy. The manipulation is austere.

Smoke-free mirror polishing groove: This groove contains a variety of components, Fugu strong oxidant, can mirror polish aluminum alloy. Compared with other polishing techniques, this groove has the following characteristics:

There is no yellow smoke, and the brightness is not chaotic: this groove is added with a sufficient amount of smoke pressing, and the decomposition of yellow smoke is thoroughly pressed; Because the strong oxidant decomposes more slowly and the concentration is less chaotic than that of the three-acid tank, the brightness difference of different batches of aluminum alloy is much smaller than that of the three-acid polishing.

Brightness increase: The brightness of chemical polishing is related to the concentration of phosphoric acid, nitric acid, and temperature, as well as the moisture content of the polishing slurry. The higher the water content, the lower the brightness; The phosphoric acid content in the tri-acid polishing slurry is as high as 80% (the water content of phosphoric acid is 15%), and the corresponding water content of the polishing slurry is less than 12%; If the water content is too high, it will reduce the brightness of the polished material. In the production process, the smokeless mirror polishing liquid is concentrated at a high temperature for a long time, and the water content is 5%, so the brightness of the mirror polishing material is significantly improved.

It can drip for a long time: considering that the chemical polishing reaction is too violent, after the aluminum alloy leaves the bath, the dripping time cannot exceed 20s, and a large amount of polishing liquid is brought into the washing tank, resulting in the cost of polishing materials is too expensive. A sufficient amount of corrosion inhibitor is added to the smokeless mirror polishing slurry to protect the aluminum alloy from the bath liquid, and it can drip in the air at any time without flowers and no flow marks. As a result, the polishing slurry can be reduced by more than 70%.

Automatic ash removal: When the aluminum alloy is impure or the polishing liquid is aging, the aluminum is polished by three acids, and there is often a layer of black ash on the surface, which is difficult to remove by general methods, which severely affects the quality of the polished material. In the smoke-free mirror polishing tank, the ash removal component is added, which can automatically remove the polishing ash.

High yield: Because the mirror polishing groove solves the problems of color difference, flow marks, flowers, polishing ash, etc., the yield rate is greatly improved. As a result, the cost is reduced and the production is improved.

(3) Gloss-preserving oxidation tank. This slot is set up for two main purposes:

Prefabricated chemical oxide film: gloss-preserving oxidation tank, which can produce an oxide film of a certain thickness and completely retain the original brightness; Before the steel alloy is polished from mirror surface to anodizing, it can be prefabricated with a certain thickness of chemical oxide film through the gloss-preserving oxidation tank to avoid pitting corrosion or flowers in the washing tank before oxidation, improve the yield rate, and reduce oxidation and light loss during anodizing.

Fine ash removal: There are two sources of polishing ash, one is the inclusion in the aluminum alloy, and the other is the aging of the polishing liquid. Polishing ash is difficult to remove by general methods, which can seriously affect the appearance quality of polishing materials. Although a fume-free mirror polishing tank has been added with a decorating agent to remove most of the polishing ash, there may still be a small amount of polishing residue. The gloss-preserving oxidation tank can thoroughly clean the polishing ash, so as to ensure the quality of the polishing material.