The main reason that affects the oxidation and discoloration of the Dwv Coupling Reducer C*C surface during the production process
1. The influence of lubricating oil outside the disk stretch
When the Dwv Coupling Reducer C*C is stretched on the disc, the acidity of the lubricating oil on the outside of the drawing is required to be moderate, so that it does not corrode the surface of the Dwv Coupling Reducer C*C. This is the most basic requirement. Secondly, the lubricating oil is required to have good volatility and less residue during annealing.
2. The influence of the degree of cleanliness of the copper pipe layer winding
The oil film remaining on the surface of the copper tube during stretching, if it is not cleaned during the layer winding, there will be more oil and carbon residue on the surface of the copper tube after annealing. At the same time, the volatilized oil vapor will also condense in the furnace during cooling. The inner wall of the bladder and the upper surface of the gasket cause pollution to the surface of the Dwv Coupling Reducer C*C. After the contaminated copper pipe is released from the furnace, it is easy to absorb moisture in the environment to form a water film. The pollutants greatly improve the conductivity of the water film, accelerate the electrochemical corrosion process, that is, accelerate the oxidation and discoloration of the surface of the copper pipe, thereby producing Surface oxidation and discoloration.
3. The influence of the degree of cleanliness of the oil fume removal in the furnace during annealing
If the volatilized oil fume is not cleanly removed during annealing, the volatilized oil fume will recondense and adhere to the surface of the Dwv Coupling Reducer C*C during cooling to cause pollution. After the contaminated copper pipe is released from the furnace, it is easy to absorb moisture and form a water film, which accelerates the oxidation and discoloration of the copper surface.
4. The influence of annealing temperature
The greater the temperature difference between the annealing temperature and the room temperature, the greater the suction force of the coil middle layer on the outside air when it is cooled, that is, the easier it is for the outside moisture to enter the middle layer of the copper tube.
5. Protection after annealing
When the impurity gas content in the environment is the highest and the environmental humidity is high, there is a temperature difference between the middle layer of the copper tube after annealing and the external environment. If the protection is not in place after the furnace is released, the gas in the environment (including moisture) during the cooling process It is very easy to diffuse into the intermediate layer and adhere to the surface of the Dwv Coupling Reducer C*C to form a water film and eventually cause oxidation and discoloration.
6. The influence of the tightness of the package
If the copper tube is not packaged in a sealed package, the packaged copper tube will change with the temperature difference between day and night and the temperature of the storage environment during the storage process, causing the humidity in the environment to enter the middle layer of the coil and be adsorbed on it. The outer surface of the Dwv Coupling Reducer C*C causes oxidation and discoloration.
7. The influence of pH and dryness of packaging materials
If the packaging material is acidic or alkaline, it will corrode the copper tube and cause discoloration of the contact surface; if the packaging material is too humid, it will easily cause the surface of the copper tube in contact with the packaging material to discolor.