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Ammonium bifluoride /acidammoniumfluoride

Views: 6     Author: IVY     Publish Time: 2024-10-14      Origin: Site

Ammonium bifluoride /acidammoniumfluoride


Ammonium fluoride, also known as ammonium bifluoride . Its properties are as follows:

1. Appearance: Ammonium bifluoride is a colorless crystalline solid or granular powder.


2. Solubility: Ammonium bifluoride has good solubility in water, and the solution is weakly acidic.


3. Acidic: Ammonium bifluoride can release hydrogen fluoride gas in humid air.


Uses of Acidammonium fluoride:

As an etching agent and degumming agent: Ammonium hydrogen fluoride has strong etching and stain removal capabilities, and is commonly used in the etching process in semiconductor manufacturing and glass industry.

Ammonium bifluoride is a strongly acidic compound, also known as ammonium hydrofluorate, with the chemical formula NH4F. It is an inorganic salt that is soluble in water and corrosive. Ammonium bifluoride is commonly used to etch glass and metal surfaces because of its highly corrosive and strongly acidic nature.


Ammonium bifluoride plays a key role in the process of etching glass. Its principle mainly includes the following aspects:


First, ammonium bifluoride is capable of chemical reactions with glass surfaces. Glass is mainly composed of silica (Si02), and the gas ions (F-) in ammonium bifluoride are highly reactive and can react with silicon-oxygen bonds (Si-0-Si) on the surface of glass to form silicon fluoride compounds. These silicon fluoride compounds have high solubility and can be easily removed, enabling etching of glass surfaces


Second, ammonium bifluoride is strongly acidic. It dissociates into hydrogen ions (H+) and gas ions (F-) in water to form hydrofluoric acid (HF). Hydrofluoric acid is a relatively strong acid that can chemically react with the surface of glass and cause corrosion of glass. During the etching process, hydrofluoric acid continuously reacts with the glass surface, causing it to gradually corrode, and then the etching effect of the glass surface is realized.


Third, ammonium bifluoride is able to provide fluoride ions. When fluoride ions react chemically with the surface of glass, they can cause defects and damage, thus accelerating the etching process. The high activity and special properties of fluoride ions allow it to have a more drastic effect on the glass surface and promote the etching



In summary, the principle of ammonium bifluoride etching glass is based on its high corrosiveness and strong acidity. In the etching process, ammonium bifluoride achieves etching of the glass surface by chemically reacting with the glass surface to provide hydrogen ions and fluoride ions, as well as causing corrosion and destruction of the glass surface. This etching technique is widely used in semiconductors. In the field of displays, optics and micromechanics, high-precision microfabrication and patterning are possible. However, due to the highly corrosive nature of ammonium bifluoride, etching operations need to be carried out under strict control conditions to ensure that the etching process is completed safely and efficiently.

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