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Selection of alkali etching process for aluminum profiles
Content source: http://huichenglawyer-sy.com Author: military general release date: May 8, 2020 09:08 reading times: 1156 times Click collection

Through the above The article "the principle and purpose of aluminum profile alkali etching" and "the main factors affecting the alkali etching treatment of aluminum profile" have carried on the more detailed discussion to the aluminum profile alkali corrosion. Then, as a very common process in the surface treatment of aluminum profile, what is the preparation principle? Here, first of all, the specific requirements for the processing of all profiles should be made clear. These requirements mainly include the brightness, smoothness and etching amount after alkali etching Aluminum profile Based on the necessary experiments on the etching speed in the alkali etching process, two kinds of alkali etching process formulations are summarized for reference. One is sodium hydroxide, the other is sodium carbonate. These two formulations are listed in the table below;

 Heavy duty industrial aluminum profiles

The formula in the table below two The amount of surfactant in the surface depends on the surface area of the solution, so it is better to add less and more frequently two On the one hand, sodium hydroxide in the solution can improve the etching speed of aluminum, and prevent sodium carbonate from hydrolyzing to produce sodium bicarbonate precipitation, which will affect the alkali etching effect one The amount of single side etching per minute is about two μ m fifty C, sodium hydroxide 30~40g/L ); formula two Less than one side etching per minute one μ m (sodium hydroxide 1g/L 55~60 ℃);


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Solution composition
Material name
chemical formula
Content / (g / L)
Formula 1
Formula 2
Formula 3
Formula 4
Formula 5
Formula 6
sodium hydroxide
NaOH
30~40
1~2
30~40
1~2
30~40
1~2
Anhydrous sodium carbonate
Na2CO3
60~70
60~70
60~70
Sodium phosphate
Na3PO4
0~20
0~20
0~20
0~20
0~20
0~20
Sodium gluconate
C6H11O7Na
five
five
2~4
2~4
Trisodium citrate dihydrate
Na3C6H5O7·2H2O
three
three
two
two
glycerol
C3H8O3
five
five
five
five
Triethanolamine
N(CH2CH2OH)3
five
five
boric acid
H3BO3
five
five
Sodium metaborate
NaBO2·4H2O
0~5
five
urea
CO(NH2)2
0~5
0~5
surface active agent
appropriate amount
appropriate amount
appropriate amount
appropriate amount
appropriate amount
appropriate amount
Operating conditions
Temperature / ℃
40~55
50~65
40~55
50~65
40~55
50~65
Time / S
20~120
40~180
20~120
40~180
20~120
40~180

There is also a problem that needs to be paid attention to here. Alkali corrosion is not oil removal, it can not replace the oil removal process. At present, many oxidation plants use alkali corrosion as oil removal process, which has no oil seal and surface pollution Aluminum profile With the appearance of some new oil removal process formulas, the cost of oil removal does not increase much, but it does provide a clean surface for alkali corrosion, which makes the alkali corrosion process easy to control and provides basic guarantee for mass production of products;


In the process of aluminum profile processing, any processing process has a basic requirement of surface state, which includes surface cleanliness, surface smoothness, surface brightness, etc. these basic requirements can be referred to as the benchmark; for example, chemical degreasing requires the profile surface to be free of oil slick, imprint, etc., if the profile surface can not meet this requirement, it must be before chemical degreasing Another process is added to meet the surface requirements of chemical degreasing; alkali corrosion requires that the profile surface is clean and free of oil, and the defects of the material itself are not included in the requirements;


For the selection of alkali etching process formula, two aspects can be considered. One is to use sodium hydroxide as the main alkali etching process. This method has the advantages of fast alkali etching speed, short processing cycle, and easy to be processed in batches. At the same time, this method has strong corrosion ability on the surface of aluminum profiles Aluminum profile The corrosion rate of matrix is fast, and the loss of aluminum is large. For thin workpiece, if rework occurs, it is easy to make the profile thickness change beyond customer requirements and scrap; second, the alkali etching process with sodium carbonate or sodium phosphate as the main body is adopted, which has a slow corrosion speed and achieves the same surface effect, which is longer than that of sodium hydroxide method, and is not easy to be processed in batch This method should be the preferred method when there is no special requirement for processing speed. No matter what alkali etching method is used, the profile must be degreased in advance;

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Tianjin Aipu industrial aluminum profile Co., Ltd
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Service hotline: 137021119190 (24-hour service hotline)
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Address: a3-2 Saida international industrial city, Xiqing Economic and Technological Development Zone, Tianjin
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