Tempered glass manufacturers briefly describe what is the dirty thing on the glass that cannot be wiped off?

Tempered glass manufacturers briefly describe what is the dirty thing on the glass that cannot be wiped off?

Hello everyone, I'm Xiaobian. Today, I will introduce to you what is the dirty thing on the glass that cannot be wiped off? The following content is organized by the tempered glass manufacturer, and the relevant content is for reference.

Today, glass has become one of the most important materials in daily life, production and science and technology. In everyone's cognition, it may be felt that the glass in life is a very stable material, which is not easy to corrode. However, if you carefully observe the mirror in the bedroom or the glass on the window, you will find that with the prolongation of use time, white fog and white spots will appear on the surface of the glass, which cannot be removed even after wiping with water.

What is the dirt that cannot be wiped off the glass?

These white fog and white spots are not dust, but the product of glass corrosion. Some people use "glass weathering" and "glass mold" to describe this corrosion phenomenon. At the turn of spring and summer, the temperature and humidity gradually increase, which will greatly increase the probability of glass corrosion. For building window glass that is simply subject to atmospheric erosion, its corrosion can be divided into four stages:

1. Substances such as water, carbon dioxide and dust in the air will be adsorbed on the glass surface to form deposits, but such surface deposits are easy to clean with water.

2. If the glass has been under high humidity conditions (above 60%), the deposits on the surface will become thicker (about 1 μm), water or moisture will diffuse into the glass, and the glass components will be hydrolyzed to make the surface discolored, still Can be cleaned with water.

3. After the deposition film is formed on the glass surface, if it continues to be in a high humidity atmospheric environment, some components (alkali metals and alkaline earth metals) will be enriched and leached on the glass surface, and the soluble silicates on the surface will be destroyed.

At this time, there will be a substance with high silicon content in the local position, which looks like water residue. The slightly corroded part can be cleaned with vinegar, and the severely corroded part can even be effectively cleaned with the aforementioned hydrofluoric acid. .

4. In the final stage, the glass surface will become very rough, and severe corrosion will occur locally. This is because the sodium ions in the glass migrate from the matrix and react with the air to form white alkaline substances, which are white fog and white spots on the glass, which cannot be effectively cleaned even with hydrofluoric acid.

To give an example from life: the longer a mirror is used, the more blurred it will feel. This is because the surface is corroded and becomes rougher, and the incident light is partially reflected. From the first stage of glass corrosion, the service life of the mirror can be extended by wiping lightly with water every week to keep the mirror clear and clean.

In addition to white fog and white spots, glass corrosion will also appear rainbow spots. Its causes are more complicated and can be divided into two types:

1. Produced during the production process, also known as stress spots. There is currently no way to avoid the phenomenon of interference of incident light due to uneven stress distribution inside the glass; 2. It is generated during use and is eroded by water vapor in the air or other chemical products.

Although glass corrosion can bring troubles to our lives, it is a useful processing method in the glass processing process. In addition to direct engraving, glass can also be etched using etchants (HF, hydrofluoric acid). Coat the glass with paraffin liquid dissolved in gasoline as a protective layer, and engrave the required characters or patterns on the cured paraffin layer. The depth of the notch should make the glass exposed; Control the corrosion time, adjust the depth of the desired pattern, and then wash off the paraffin and hydrofluoric acid with warm water to obtain patterned glass. (It is not recommended to operate by yourself, hydrofluoric acid is highly corrosive)

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