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Main factors affecting alkali etching treatment of aluminum profiles
Content source: http://huichenglawyer-sy.com Author: military general, release date: May 6, 2020 08:55 times of reading: 1477 times Click collection

one Effect of sodium hydroxide concentration on alkali etching treatment of aluminum profiles

In alkali etching treatment, the concentration of sodium hydroxide is high, and the etching speed is fast. At the same time, the surface luminosity of aluminum profile after etching is improved. However, due to the high concentration of sodium hydroxide, attention should be paid to the control of etching temperature and time to prevent the occurrence of over corrosion. Too high concentration of hydrogen and oxygen will make the alkali etching process difficult to control, meanwhile, the amount of sodium hydroxide carried out will increase and the production cost will increase The results show that the etching process is easy to control due to its low etching speed, moderate luminosity and easy to control. However, the low sodium hydroxide concentration will make the alkali etching not work normally, and the solution adjustment cycle is short, which will bring inconvenience to the production 30~40g/L In this concentration range, when the temperature is at fifty At ℃, one thousand and fifty system Aluminum profile The etching speed is about two μ m/min five thousand and fifty-two and six thousand and sixty-one The aluminum profile is about three μ m/min

 European standard industrial aluminum profiles
two Effect of aluminum ion concentration on alkali corrosion

The aluminum ion in alkali etching solution has certain influence on the control of etching speed and the surface luminosity of aluminum profile; since there is no aluminum ion in the solution of new solution, it can be considered that the control of aluminum profile etching is difficult, one is in the etching speed, the other is in the surface state of aluminum profile after etching; however, this is based on the fact that aluminum ion will not be able to control the etching speed in the etching process The hypothesis of cumulative increase is tenable only when the aluminum profile is etched without control, or the products with obvious process defects in the molding process of individual aluminum profiles will occur. However, the aluminum profile materials with good processing performance will rarely be uncontrollable in the newly prepared alkaline solution; however, the actual situation is along with the production Aluminum ions will accumulate rapidly in the solution. Of course, it is undeniable that a certain concentration of aluminum ions in the solution has a certain positive effect on improving the surface condition of aluminum profiles after alkali etching, 5g/L As for the aluminum material, it will not affect the brightness of the surface after alkali etching 60g/L Therefore, only those surfaces which need to be treated to matte effect need higher concentration of aluminum ions, but too high concentration of aluminum ions will increase the cleaning ability after alkali etching; in the surface treatment of aluminum profiles, the matte effect should not depend on the high concentration of aluminum ions in alkali etching solution, but should be carried out by special Matt treatment method which is easier to control;

 

The main task of alkali corrosion is to make Aluminum profile In order to obtain a cleaner surface, the amount of etching is very small. Both the concentration of alkali and the etching temperature are essentially different from the alkaline etching of aluminum profiles with a certain depth. Therefore, it is not necessary to pay too much attention to the over corrosion of aluminum profiles caused by low concentration of aluminum ions in the newly prepared solution (except for architectural aluminum profiles), but attention should be paid to the coordination of temperature and time, The temperature of the new solution should be lower than that of the old solution, and the alkali corrosion time should be appropriately shortened. Of course, for some aluminum profiles with quality defects, the new solution must be aged with aluminum chips in advance;

 

three Effect of sodium carbonate concentration on alkali corrosion

The results show that the surface luminosity of aluminum profile after alkali etching is lower than that of sodium hydroxide, but the etching amount is much lower than that of sodium hydroxide in alkali etching solution with sodium carbonate as the main body 50~100g/L When the concentration of sodium carbonate is in the range of 0 60g/L The temperature is at sixty When the temperature is ℃, it is right one thousand and fifty five thousand and fifty-two and six thousand and sixty-one The etching speed of aluminum profile is in one μ m/min In order to prevent sodium carbonate from precipitating in the air, sodium carbonate can be added to the solution to prevent the formation of sodium carbonate 1~2g/L

 

four Influence of operating conditions on alkali corrosion

The influence of alkali etching operation conditions on the etching process mainly focuses on temperature and time; generally, high temperature, fast etching speed, short processing cycle, high surface luminosity of aluminum profile after etching is high, but too high temperature will make etching speed too fast, affect the etching quality, and even cause the profile scrap; on the contrary, if the temperature is too low, the etching speed is slow, the time is long, and the luminosity is low The results show that the etching is not uniform; the temperature of the formula with sodium hydroxide as the main body is at 40~55 The optimum temperature of the formula with sodium carbonate as the main body is at 45~65 The temperature is suitable;

 

The control of time is mainly related to three conditions: the first is alkali etching concentration; the second is alkali etching temperature; the third is the etching requirements for aluminum profiles; the different mesh requirements for profile surface etching will make the etching time vary greatly. Generally, the alkali etching time of sodium hydroxide based alkaline etching process is in the range of 0.5-0.5 20~120s The results show that the alkali etching time of sodium carbonate is in the range of 0 30~180s Change;

 

five On the leveling effect of alkali erosion

One of the problems that should be paid attention to in alkali etching is the leveling effect; some aluminum profiles will leave different processing lines on the profile surface due to the defects of processing technology, which are expected to be eliminated through the pretreatment process during the surface treatment; the leveling of alkali corrosion can be satisfied by adding some substances that can increase the density of solution The additives include phosphate, dextrin, gum Arabic, diatomite and so on. Among them, diatomite has the best effect. Of course, the leveling effect of high concentration aluminum ion is also excellent, so these additives are only meaningful for the newly prepared solution; however, the leveling effect of alkali corrosion is limited, and the leveling effect of high concentration aluminum ion is actually through the Aluminum profile The results show that the high concentration of aluminum ions in alkali etching solution can make the surface of aluminum profile after etching appear matte. With the increase of aluminum ion concentration, the surface roughness will also increase. At this time, the so-called leveling effect is that the matte and roughened surface cover up the surface texture of the material, and do not achieve the real leveling effect However, some materials have introduced the use of high concentration of aluminum ions to achieve matte and eliminate extrusion lines of aluminum profiles, but the editor thinks that this effect is very limited and does not have the leveling effect of polishing effect. It is only meaningful for the processing of low requirements and large quantities of aluminum profiles;

 

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Tianjin Aipu industrial aluminum profile Co., Ltd
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Email address: lxc@apas.com.cn
Address: a3-2 Saida international industrial city, Xiqing Economic and Technological Development Zone, Tianjin
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