Hydrogen fluoride (chemical formula: HF ), a compound which forms a hydrogen bond with a hydrogen atom due to a large electronegativity of a fluorine atom. Hydrogen fluoride is a very strong corrosive agent and is highly toxic. It is a colorless gas, but in the air, as long as it exceeds 3 ppm, it will produce a pungent taste. Hydrogen fluoride is a colorless and transparent fuming liquid which is an aqueous solution of hydrogen fluoride gas. The relative density is 1.128 ( 40% ) and has a pungent odor. It is a medium strength acid. In a dilute solution, hydrofluoric acid is slightly dissociated into ions. In a concentrated solution, hydrofluoric acid is polymerized to form H2F2 molecules, which dissociate into H2F2 = H+HF2 , which is extremely corrosive and can corrode glass and silicic acid. The salt forms a gaseous silicon tetrafluoride, which is extremely volatile. It reacts with metal salts, oxides and hydroxides to form fluoride. It does not corrode polyethylene and platinum. Hydrofluoric acid cannot be oxidized or reduced. reaction. Very toxic! When it touches the skin, it has a density of 1.14g/cm3 at the highest concentration and a boiling point of 393.15K ( 120 °C). It has weak acidity, but the ionization degree when concentrated is larger than that of the rare time and is different from the general weak electrolyte. Now Beijing Zhisheng Weihua Chemical Co., Ltd. has developed R&D technicians. After five years of market follow-up investigation and laboratory trial and error, it has launched a special anti - hydrofluoric acid anti - corrosion coating. ZS-1033 hydrofluoric acid anti-corrosion coating uses phenolic resin and heavy crystal. Special materials such as stone, nano-chromium powder and anti-media solid filler are processed. The coating is dense and stable, resistant to strong acid corrosion, especially resistant to hydrofluoric acid ( HF ). The coating can also prevent hydrogen ion penetration. Good protection metals and other materials are not corroded. After the specific use of experts and working conditions, the characteristics and application effects of the materials are highly praised by experts and field personnel.
The aqueous solution of hydrofluoric acid is a weak acid. Due to the high polarity of the HF covalent bond and the intermolecular hydrogen bonding of hydrogen fluoride, hydrogen fluoride is highly energetically stable and the degree of dissociation is very low. Therefore, the concentration of hydronium ions generated by dissociation is low, and the acidity constant Ka is low. Thus hydrogen fluoride is a weak acid.
HF(aq) + H2O(l) â†â†’ H3O+(aq) + F-(aq)  Ka=7X10-4 mol dm-3
The concentration of other hydrogen halide in water increases and the acidity decreases.
HA(aq) + H2O(l) â†â†’ H3O+(aq) + A-(aq)
For the general hydrohalic acid, the hydrogen halide concentration rises to a certain extent, and the water content per unit volume of the solution drops sharply, so that the equilibrium position of the reaction tends to the left, the degree of dissociation decreases, and the acidity decreases. However, in a concentrated aqueous solution of hydrogen fluoride, the acidity will increase. This phenomenon is due to a reaction of fluoride ions :
F- + HF â†â†’ HF2-   K=5.1 mol-1 dm3
For hydrofluoric acid, if the concentration of hydrogen fluoride increases, the equilibrium position of the above reaction tends to the right, causing the concentration of fluoride ions to decrease.
HF(aq) + H2O(l) â†â†’ H3O+(aq) + F-(aq)
According to the Le Chatelier principle, the equilibrium position of this chemical equilibrium tends to the right to increase the concentration of fluoride ions, so the degree of dissociation increases and the acidity rises.
Hydrofluoric acid can strongly corrode metals, glass and silicon-containing objects. For example, inhalation of vapor or contact with human skin can form ulcers that are difficult to heal and are difficult to cure. Fluorine is the most active non-metal, has strong oxidizing power, and the radius of fluoride ion in hydrofluoric acid is very small, even smaller than oxygen ion, which leads to its strong permeability, and dense oxide can not prevent its penetration. . Hydrofluoric acid itself has a strong ability to attack silicate (silicon) and silica, so it is more serious damage to teeth and bone. It is highly corrosive to silicon compounds (the main components are silica and silicate ) . It is the only acid that can corrode glass. Therefore, plastic bottles or lead containers should be used for daily storage.
CaSiO3(s) +6HF(aq) → CaF2(aq) + SiF4(aq) + 3H2O (l)
Using technology to build products, using test data to speak, the use of high-precision processing equipment, and the assistance of vacuum high-temperature environment, Beijing Zhisheng Weihua Company has overcome the hardships and solve the most practical problems with the tireless anti-corrosion coating research and development spirit. Shengweihua has always been the company's development philosophy.
Beijing Zhisheng Weihua Chemical Co., Ltd. ZS-1033 is resistant to hydrofluoric acid anticorrosive coating. Hydrofluoric acid (chemical formula: HF ) is a very strong corrosive agent and highly toxic. It is a colorless gas or liquid, but in the air, as long as it exceeds 3 ppm, it will produce a pungent taste. Hydrofluoric acid, in the anti-corrosion industry, he can be called the most terrible corrosion damage devil, extremely corrosive, high permeability of corrosive medium. Hydrofluoric acid can strongly corrode metals, glass and silicon-containing objects. For example, inhalation of vapor or contact with human skin can form ulcers that are difficult to heal and are difficult to cure. Fluorine is the most active non-metal, has strong oxidizing power, and the radius of fluoride ion in hydrofluoric acid is very small, even smaller than oxygen ion, which leads to its strong permeability, and dense oxide can not prevent its penetration. . Now Beijing Zhisheng Weihua Chemical Co., Ltd. has developed R&D technicians. After five years of market follow-up investigation and laboratory trial and error, it has launched a special anti - hydrofluoric acid anti - corrosion coating. ZS-1033 hydrofluoric acid anti-corrosion coating uses phenolic resin and heavy crystal. Special materials such as stone, nano-chromium powder and anti-media solid filler are processed. The coating is dense and stable, resistant to strong acid corrosion, especially resistant to hydrofluoric acid ( HF ). The coating can also prevent hydrogen ion penetration. Good protection metals and other materials are not corroded. After the specific use of experts and working conditions, the characteristics and application effects of the materials are highly praised by experts and field personnel. Zhisheng's research and development of hydrofluoric acid anticorrosive coatings successfully solved the anti-corrosion problem of the anti-corrosion industry for 100 years.
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