Bright Aluminum Etching Pretreatment Technology For Industrial Aluminum Profiles

- Jun 19, 2019-

1. Features


The industrial aluminum profile surface bright acid etching technology is deeply modified by the traditional acid etching bath, equipped with a sand surface polishing tank and a flat light polishing tank to brighten the acid etching material. Not only the acid etching process has the advantages of strong mechanical graining ability, quick sanding and low aluminum consumption. Moreover, it completely removes the acid ash, restores the metallic luster, and performs strong low-temperature polishing to solve the problems of darkening of the surface of the acid-etched sand surface, staining of the coloring tank, and contamination of the electrophoresis tank. The sand surface material treated by the bright acid etching technology has no surface, no ash, fine sand and bright. At the same time, mechanical blasting materials also have problems of surface ashing and darkening, and also need to be polished. In addition, by the bright acid etching technology for degreasing, film removal, brightening and ash removal, it can replace the low temperature polishing tank, and the three-in-one tank to produce flat material.


The high acid etching technology consists of four processes: deoiling, dewaxing, brightening, sanding and polishing. The dewaxing tank is responsible for degreasing, dewaxing and natural oxide film. The brightening and etching tank is responsible for going. Grain, sanding and adjustment of the industrial aluminum color to the initial blue light; the sand surface polishing tank is responsible for removing the acid ash and low-temperature polishing of the sand surface material; the flat polishing tank is responsible for further increasing the brightness and fine ash removal, and Fixed industrial aluminum profile metal luster. The four processes are interdependent and intertwined to form a complete and rigorous bright acid etching technique. The features of this technology are as follows:


(1) A complete four-tank combination technology, which completely treats industrial aluminum profiles with acid method, covers all oxidation pretreatment processes under low temperature conditions, and is polished, so it has the characteristics of low aluminum consumption and high brightness.


(2) The concept of brightening acid etching is proposed. The industrial aluminum profile is blue and shiny at the same time as the grain removal and sanding.


(3) The concept of sand surface polishing is proposed. The ash removal and polishing in a tank can completely remove the acid ash, and at the same time, the low-temperature polishing effect of the sand surface material can be obtained.


(4) The concept of flat polishing is proposed. The brightness of the polished aluminum industrial profile is fixed first, that is, by borrowing the technical idea of fixing in the phase washing process, the polishing brightness of the industrial aluminum profile is determined to be first set, and then the positive oxidation is performed to effectively reduce the brightness loss.


2. Analysis of process flow and operation points


(1) Description of the slot setting: There is no water washing between the brightening acid etching tank and the sand surface polishing tank.


(2) The function of the bath is as follows:


(1) Degreasing and dewaxing tank: In addition to the function of degreasing and dewaxing, the natural oxide film can be removed. Deburring surface and low temperature polishing; combination of degreasing and dewaxing tank, sand surface polishing and flat polishing bath to achieve low temperature polishing function, producing bright acid etching flat material;


(2) Brightening acid etching tank: This tank is modified by adding special additives on the basis of the existing acid etching tank, and the original slagging equipment is kept unchanged. Brightening acid etching is fundamentally different from ordinary acid etching. First of all, the ability of ordinary acid etching to remove mechanical marks and surface flaws is weak. After bright treatment, surface defects are exposed. Brightening and etching greatly increases the ability of the acid etching bath. It can completely eliminate surface defects in the same or shorter time; secondly, the industrial aluminum profile is very dark after ordinary acid etching treatment, it is very difficult to remove ash and brighten, and the sand surface polishing groove and the plane polishing groove are added. pressure. In addition to extending the polishing time, the chemical consumption of the sand surface polish and the flat polishing tank is also increased. Brightening acid etching can improve the acid etching ability, and make the industrial aluminum profile blue and bright, which lays a good foundation for the later sand polishing and polishing process.


(3) Sand surface polishing tank: After the acid etching of the industrial aluminum material, it is not an alkali tank, but a sand surface polishing tank, which removes ash and polishes the acid etching material, and retains the fine sand of the acid etching material and has no grain. And low aluminum consumption, increased brightness and metallic color, combined with brightening acid etching and sand surface polishing technology, can produce a new type of material - surface without grain, fine sand, bright, retaining metallic Bright acid etching abrasive material. In addition, the sand surface polishing tank can brighten the sandblasting material, improve the grade of the sandblasting material, and produce a bright acid etching sandblasting material. The sand surface polishing tank is opened in the ordinary anti-corrosion tank, and a small amount of acid slag is crystallized at the bottom of the tank, and the tank is cleaned at the end of the year.


(4) Flat Polishing Tank: There are two main purposes for setting the groove, that is, flat polishing and fine ash removal for industrial aluminum profiles polished by sand surface.


1 flat polishing: flat polishing tank can not only produce a certain thickness of oxide film, but also greatly increase the brightness of aluminum alloy. Since the anodizing causes the industrial aluminum profile after the sand surface polishing treatment to lose light, the flat polishing process is first performed, and a dense oxide layer is formed on the surface to set the gloss ring, and then anodizing is performed to greatly reduce the loss of light; Before the industrial aluminum profile is polished from sand surface to anodized, it needs to be washed several times, and it may stay in the air or in the washing tank, causing pitting. If the flat polishing tank is used first, a certain thickness of chemical oxide film is prefabricated and protected first. Thereby, pitting corrosion or flower material is generated in the water washing tank before oxidation, and the yield is improved.


2 fine ash removal: acid ash is very stubborn, the general method is difficult to remove, will seriously affect the appearance quality of acid-etched materials. Although the sand surface polishing tank can remove most of the ash, there may still be a small amount of residue under certain special conditions. The flat polishing bath can completely remove the acid ash, thus ensuring the quality of the industrial aluminum profile and completely eliminating the contamination of the coloring tank and the electrophoresis tank by the acid ash.


(3) Description of process operation mode: The industrial aluminum profile is degreased after 1-4min, and after entering a water washing, it enters the brightening acid etching tank. After 4-12min, it is not washed with water, directly into the sand surface polishing tank, and the reaction is 3-9min. After washing with water, it is polished into a flat polishing bath. After 3-7 minutes of reaction, it can be pre-treated into the anodizing tank after washing with two passes.


3. A variety of varieties, can produce a variety of new aluminum profiles:


(1) Bright acid etching abrasive material: the bright acid etching abrasive material can be produced by the combination of degreasing and dewaxing tank, brightening acid etching tank, sand surface polishing tank and flat light polishing tank;


(2) Bright acid etching sandblasting material: bright acid etching sandblasting material can be produced by combination of degreasing and dewaxing tank, sand surface polishing tank and flat light polishing tank;


(3) Bright acid etching flat material: The bright acid etching flat material can be produced by the combination of degreasing and dewaxing tank and flat polishing bath.


The industrial aluminum profile surface bright acid etching technology is deeply modified by the traditional acid etching bath, equipped with a sand surface polishing tank and a flat light polishing tank to brighten the acid etching material. Not only the acid etching process has the advantages of strong mechanical graining ability, quick sanding and low aluminum consumption. Moreover, it completely removes the acid ash, restores the metallic luster, and performs strong low-temperature polishing to solve the problems of darkening of the surface of the acid-etched sand surface, staining of the coloring tank, and contamination of the electrophoresis tank. The sand surface material treated by the bright acid etching technology has no surface, no ash, fine sand and bright. At the same time, mechanical blasting materials also have problems of surface ashing and darkening, and also need to be polished. In addition, by the bright acid etching technology for degreasing, film removal, brightening and ash removal, it can replace the low temperature polishing tank, and the three-in-one tank to produce flat material.


The high acid etching technology consists of four processes: deoiling, dewaxing, brightening, sanding and polishing. The dewaxing tank is responsible for degreasing, dewaxing and natural oxide film. The brightening and etching tank is responsible for going. Grain, sanding and adjustment of the industrial aluminum color to the initial blue light; the sand surface polishing tank is responsible for removing the acid ash and low-temperature polishing of the sand surface material; the flat polishing tank is responsible for further increasing the brightness and fine ash removal, and Fixed industrial aluminum profile metal luster. The four processes are interdependent and intertwined to form a complete and rigorous bright acid etching technique. The features of this technology are as follows:


(1) A complete four-tank combination technology, which completely treats industrial aluminum profiles with acid method, covers all oxidation pretreatment processes under low temperature conditions, and is polished, so it has the characteristics of low aluminum consumption and high brightness.


(2) The concept of brightening acid etching is proposed. The industrial aluminum profile is blue and shiny at the same time as the grain removal and sanding.


(3) The concept of sand surface polishing is proposed. The ash removal and polishing in a tank can completely remove the acid ash, and at the same time, the low-temperature polishing effect of the sand surface material can be obtained.


(4) The concept of flat polishing is proposed. The brightness of the polished aluminum industrial profile is fixed first, that is, by borrowing the technical idea of fixing in the phase washing process, the polishing brightness of the industrial aluminum profile is determined to be first set, and then the positive oxidation is performed to effectively reduce the brightness loss.


2. Analysis of process flow and operation points


(1) Description of the slot setting: There is no water washing between the brightening acid etching tank and the sand surface polishing tank.


(2) The function of the bath is as follows:


(1) Degreasing and dewaxing tank: In addition to the function of degreasing and dewaxing, the natural oxide film can be removed. Deburring surface and low temperature polishing; combination of degreasing and dewaxing tank, sand surface polishing and flat polishing bath to achieve low temperature polishing function, producing bright acid etching flat material;


(2) Brightening acid etching tank: This tank is modified by adding special additives on the basis of the existing acid etching tank, and the original slagging equipment is kept unchanged. Brightening acid etching is fundamentally different from ordinary acid etching. First of all, the ability of ordinary acid etching to remove mechanical marks and surface flaws is weak. After bright treatment, surface defects are exposed. Brightening and etching greatly increases the ability of the acid etching bath. It can completely eliminate surface defects in the same or shorter time; secondly, the industrial aluminum profile is very dark after ordinary acid etching treatment, it is very difficult to remove ash and brighten, and the sand surface polishing groove and the plane polishing groove are added. pressure. In addition to extending the polishing time, the chemical consumption of the sand surface polish and the flat polishing tank is also increased. Brightening acid etching can improve the acid etching ability, and make the industrial aluminum profile blue and bright, which lays a good foundation for the later sand polishing and polishing process.


(3) Sand surface polishing tank: After the acid etching of the industrial aluminum material, it is not an alkali tank, but a sand surface polishing tank, which removes ash and polishes the acid etching material, and retains the fine sand of the acid etching material and has no grain. And low aluminum consumption, increased brightness and metallic color, combined with brightening acid etching and sand surface polishing technology, can produce a new type of material - surface without grain, fine sand, bright, retaining metallic Bright acid etching abrasive material. In addition, the sand surface polishing tank can brighten the sandblasting material, improve the grade of the sandblasting material, and produce a bright acid etching sandblasting material. The sand surface polishing tank is opened in the ordinary anti-corrosion tank, and a small amount of acid slag is crystallized at the bottom of the tank, and the tank is cleaned at the end of the year.


(4) Flat Polishing Tank: There are two main purposes for setting the groove, that is, flat polishing and fine ash removal for industrial aluminum profiles polished by sand surface.


1 flat polishing: flat polishing tank can not only produce a certain thickness of oxide film, but also greatly increase the brightness of aluminum alloy. Since the anodizing causes the industrial aluminum profile after the sand surface polishing treatment to lose light, the flat polishing process is first performed, and a dense oxide layer is formed on the surface to set the gloss ring, and then anodizing is performed to greatly reduce the loss of light; Before the industrial aluminum profile is polished from sand surface to anodized, it needs to be washed several times, and it may stay in the air or in the washing tank, causing pitting. If the flat polishing tank is used first, a certain thickness of chemical oxide film is prefabricated and protected first. Thereby, pitting corrosion or flower material is generated in the water washing tank before oxidation, and the yield is improved.


2 fine ash removal: acid ash is very stubborn, the general method is difficult to remove, will seriously affect the appearance quality of acid-etched materials. Although the sand surface polishing tank can remove most of the ash, there may still be a small amount of residue under certain special conditions. The flat polishing bath can completely remove the acid ash, thus ensuring the quality of the industrial aluminum profile and completely eliminating the contamination of the coloring tank and the electrophoresis tank by the acid ash.


(3) Description of process operation mode: The industrial aluminum profile is degreased after 1-4min, and after entering a water washing, it enters the brightening acid etching tank. After 4-12min, it is not washed with water, directly into the sand surface polishing tank, and the reaction is 3-9min. After washing with water, it is polished into a flat polishing bath. After 3-7 minutes of reaction, it can be pre-treated into the anodizing tank after washing with two passes.


3. A variety of varieties, can produce a variety of new aluminum profiles:


(1) Bright acid etching abrasive material: the bright acid etching abrasive material can be produced by the combination of degreasing and dewaxing tank, brightening acid etching tank, sand surface polishing tank and flat light polishing tank;


(2) Bright acid etching sandblasting material: bright acid etching sandblasting material can be produced by combination of degreasing and dewaxing tank, sand surface polishing tank and flat light polishing tank;


(3) Bright acid etching flat material: The bright acid etching flat material can be produced by the combination of degreasing and dewaxing tank and flat polishing bath.