How to Deal with Blue Hexagon Bolts
2022-03-02
How to deal with blue hexagon bolts
Before leaving the factory, high-strength socket head cap bolts are generally processed, and the blueing technology is one of them. The so-called blueing treatment is to blacken the surface of the bolt.
bluing treatment
At present, the more commonly used methods are: the traditional alkaline heating blackening and the later normal temperature blackening, and the latter is not good for the treatment of low carbon steel. As for bolts made of A3 steel, alkaline Black: that is, one blackening and two blackening.
In the process of blackening, the first thing to do is to configure the blackening liquid. The main components of the blackening liquid are sodium hydroxide and sodium nitrite. In the actual treatment process, it is necessary to pay attention to the degreasing and rust removal of the bolts before they are blackened, so as to facilitate passivation and oil immersion after exertion. The quality of blackening has a lot to do with these processes.
Metal "blue" liquid medicine
The more common methods are alkaline oxidation method or acid oxidation method. By forming an oxide film on the surface of the metal to prevent the metal surface from being corroded, this treatment method is called "blue".
After the black metal surface is "blued", an oxide film will be formed on the surface. The inner layer of the oxide film is ferrous oxide, and the outer layer is ferric oxide.
When using the alkaline oxidation method to "blue" the liquid, the surface of the bolt must be cleaned first. During the treatment process, it is necessary to analyze whether the components in the liquid meet the requirements at intervals of one week. "After the bluing treatment Need to rinse with water.
When using the acid oxidation method to "blue" the liquid, it should be noted that the "blue" working temperature should be 100 degrees, and the processing time should be forty to forty-five minutes.
Before leaving the factory, high-strength socket head cap bolts are generally processed, and the blueing technology is one of them. The so-called blueing treatment is to blacken the surface of the bolt.
bluing treatment
At present, the more commonly used methods are: the traditional alkaline heating blackening and the later normal temperature blackening, and the latter is not good for the treatment of low carbon steel. As for bolts made of A3 steel, alkaline Black: that is, one blackening and two blackening.
In the process of blackening, the first thing to do is to configure the blackening liquid. The main components of the blackening liquid are sodium hydroxide and sodium nitrite. In the actual treatment process, it is necessary to pay attention to the degreasing and rust removal of the bolts before they are blackened, so as to facilitate passivation and oil immersion after exertion. The quality of blackening has a lot to do with these processes.
Metal "blue" liquid medicine
The more common methods are alkaline oxidation method or acid oxidation method. By forming an oxide film on the surface of the metal to prevent the metal surface from being corroded, this treatment method is called "blue".
After the black metal surface is "blued", an oxide film will be formed on the surface. The inner layer of the oxide film is ferrous oxide, and the outer layer is ferric oxide.
When using the alkaline oxidation method to "blue" the liquid, the surface of the bolt must be cleaned first. During the treatment process, it is necessary to analyze whether the components in the liquid meet the requirements at intervals of one week. "After the bluing treatment Need to rinse with water.
When using the acid oxidation method to "blue" the liquid, it should be noted that the "blue" working temperature should be 100 degrees, and the processing time should be forty to forty-five minutes.
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