Passivation is a process that reduces the corrosion reaction of the metal in a specific environment by controlling the formation of a passivation film on the metal surface. The principle of passivation is to use the passivation agent to chemically react with the metal surface to form a dense, corrosion-resistant passivation film, thereby preventing the metal from contacting with oxygen, water or other corrosive media in the environment.
The three elements of passivation refer to the key conditions and factors required to achieve the passivation process, including the following:
1. Passivation agent: Passivation agent is the key substance to achieve passivation process. It can chemically react with the metal surface to form a passivation film. Common passivating agents include substances such as chromates, nitrates or sulfates in acidic solutions.
2. Passivation time: Passivation time refers to the time required for the metal to contact with the passivation agent and form a passivation film. Different metals and passivating agents may take different times to form a stable passivating film. In general, a longer passivation time helps to form a more uniform and denser passivation film.
3. Passivation conditions: Passivation conditions refer to the environmental conditions required to achieve the passivation process, such as temperature, concentration, pH value, etc. The passivation process may need to be carried out over a certain temperature range, and passivation is usually more common at lower temperatures. In addition, the concentration and pH of the passivation agent also have an impact on the passivation effect and need to be adjusted according to the specific situation.
It should be noted that the passivation process should be based on the specific metal and application environment to select the appropriate passivation agent, time and conditions. Different metals and application scenarios may require different passivation schemes, so it is best to consult a professional material science or engineer before implementing passivation to ensure the effectiveness and reliability of the passivation process.
The principle of passivation is to form a layer of stable oxides or other compounds on the surface of the metal by some chemical means to prevent the metal from reacting with oxygen and water in the external environment.
The three elements of passivation include passivation liquid, passivation time and passivation temperature
Passivation liquid is the key to passivation. Because the components in the liquid will react with the metal surface to form inhibitory oxides
Passivation time and passivation temperature are also very important, because different metals and different components need different time and temperature to form a stable anti-corrosion layer
Passivation technology can be widely used in the manufacture, repair and protection of various metal products. For example, aluminum products, steel products, etc.
It can improve the corrosion resistance and scratch resistance of metal products, extend their service life, and have a positive effect on the quality of products and social and economic development
Passivation is a process by which the metal surface is oxidized to form a dense, uniform, and non-corroding oxide layer through chemical or electrochemical reaction on the metal surface. The three elements of passivation treatment include chemical treatment solution, passivation temperature and treatment time. Among them, the chemical treatment liquid is usually an acidic solution containing some kind of passivation agent, and the use conditions and effects of different passivation liquids are also different.
Passivation temperature and treatment time can be adjusted as needed, usually higher temperature and longer time can make the passivation layer more dense and uniform.