Ambient temperature: the ambient temperature of the workshop will affect the blackening tank insulation effect and temperature control precision. Tank insulation performance: blacking tank insulation design will affect the stability of temperature and energy consumption.
What is the process temperature of the blackening tank related to?
Author: Robby
The process temperature of the blackening tank is a key parameter in the blackening treatment (also known as bluing treatment or black oxidation treatment), which directly affects the quality of the oxide film, the uniformity of the colour and the efficiency of the treatment. The process temperature of the blackening tank is mainly related to the following factors:
1. Formulation of blackening liquid
Type of blackening solution: Different formulations of blackening solution have different temperature requirements. Common blackening solution includes alkaline blacking solution and room temperature blacking solution.
Alkaline blackening solution: usually in the range of 135-150 ℃.
Room temperature blackening liquid: usually in the range of 15-40 ℃.
Additive components: the blackening solution in the oxidant, catalyst and other additives will affect the temperature range of the reaction.
2. Oxide film quality requirements
Film thickness and densification: higher temperature can usually speed up the oxidation reaction rate, the formation of thicker oxide film, but the temperature is too high may lead to loose film or uneven colour.
Colour uniformity: too low a temperature may lead to incomplete oxidation reaction, film colour is not uniform or flower.
3. Workpiece Material
Type of steel: different materials of the workpiece on the blackening temperature requirements are different. For example, mild steel, medium carbon steel and alloy steel blackening temperature may be slightly different.
Surface condition: the cleanliness and roughness of the surface of the workpiece will also affect the choice of blackening temperature.
4. Production efficiency
Reaction speed: Higher temperature can speed up the oxidation reaction speed, shorten the treatment time and improve the production efficiency.
Energy consumption and cost: the higher the temperature, the greater the energy consumption, the production cost will increase, so you need to find a balance between efficiency and economy.
5. Stability of the blackening solution
Too high a temperature: may lead to decomposition or failure of the components of the blacking solution, affecting the stability and service life of the blacking solution.
Too low a temperature: may lead to incomplete oxidation reaction, the effective components of the blackening solution to reduce the utilisation rate.
6. Environmental factors
Ambient temperature: the ambient temperature of the workshop will affect the blackening tank insulation effect and temperature control precision.
Tank insulation performance: blacking tank insulation design will affect the stability of temperature and energy consumption.
7. Process requirements
Blacking type: different blacking process (such as alkaline blacking, room temperature blacking) on the temperature requirements are different.
Alkaline blacking: 135-150 ℃, suitable for high-quality requirements of the workpiece.
Normal temperature blackening: 15-40 ℃, energy saving but thin film layer, suitable for general requirements of the workpiece.
8. Size and shape of workpiece
Size of workpiece: Larger or thicker workpieces may require higher temperature to ensure that the oxidation reaction is sufficient.
Workpiece shape: complex shapes may require more precise temperature control to avoid incomplete local oxidation.
Summary
The process temperature of the blackening tank is closely related to the formula of the blackening solution, the workpiece material, the quality of the oxide film requirements, production efficiency, stability of the blackening solution, environmental factors and process requirements. In the actual production, according to the specific needs and conditions, need to choose the appropriate temperature range to ensure the quality of the oxide film and production efficiency.
Reference temperature range
Alkaline blackening: 135-150℃
Normal temperature blackening: 15-40 ℃
Selection of the appropriate temperature needs to take into account the production efficiency, energy consumption, workpiece material and film quality requirements.