Many large cold storage board manufacturers will be equipped with a strong heat insulation function of the cold storage board. The whole cold storage needs to keep the temperature below zero for a long time. In the refrigeration process of the whole cold storage board manufacturer, the refrigeration pipe needs to be refrigerated, but if the refrigeration pipe is polluted, it will affect the whole refrigeration process, so it needs to be decontaminated in time.
 

1. Leaching and decontamination: For small-diameter cold storage plate refrigeration pipes and elbows, clean white cloth can be used to soak chlorinated carbon and wipe the inner wall of the pipe. Large diameter pipes can be filled with chlorinated carbon solution for treatment. After about 15-20 minutes, loosen one end of the tube, pour out the carbon chloride solution, wipe it clean, blow dry, and seal for use. When the residual oxide scale and other dirt can not be completely removed, the use of 20% sulfuric acid solution in 40~50 ℃ pickling. The pickling work takes 10 to 15 minutes until all the scale is completely removed.

2. Manual decontamination: drag back and forth in the cold storage plate refrigeration tube with a steel wire brush until the dirt and rust in the tube are removed, then wipe it with a clean white cloth, and then blow dry compressed air to the nozzle until the ejected air has no dirt on the white paper. Enabled when duct seal is installed.

3. sandblasting decontamination: with 0.4 ~ 0.6MPa compressed air will particle size of 0.5~2.0mm sand spray to the rusty metal surface, with sandblasting to remove the dirt on the metal surface, exposing the metal texture and luster. The purified metal surface becomes rough and uniform, so that the paint and the metal surface are well combined, and the rust on the metal surface is removed.

The balanced solidification of the cold storage plate of the cold storage plate manufacturer means that the various stages of the solidification process can reach a balance, that is, there is enough time for diffusion between the components in the phase change process to reach the equilibrium phase composition. Now, we consider a 30% Cu-Ni alloy as an example to describe the equilibrium solidification process.

The liquid storage plate of the cold storage plate manufacturer is cooled from point a at high temperature. Upon cooling to point B (t = 1245 ° C.), which intersects the liquidus, crystallization begins. The composition of the solid phase can be represented by the intersection C of the connecting line BC and the solidus line. At this time, the nickel content was about 41%. The results show that at this temperature, the liquid phase containing component B and the solid phase containing component C form a two-phase equilibrium. In order to form nuclei in the liquid phase, surface work is required. At the same time, the nucleus composition in the alloy system is different from the original alloy, there is a certain free energy difference, so a certain degree of undercooling is required.

Therefore, the nucleation and growth process of the solid phase can only occur when the temperature of the cold storage plate is slightly lower than T. At this time, the composition of the crystalline solid solution is close to C. FIG. As the temperature decreases, the solid phase component changes along the solidus, and the liquid phase component changes along the liquidus. When cooled to t: temperature (1220 ℃), it can be seen from the intersection of connecting line ef (horizontal line) and liquid and solidus that the composition of liquidus is e,w(Ni) is about 24%, the composition of solidus is f, and w(Ni) is about 36%. According to the lever law, the relative contents of the liquid and solid phases are 50%. When cooled to t: temperature (1210°C), the composition of the solid solution is the original alloy composition (w(Ni) is 30%), and it forms equilibrium with a drop of liquid (composition g). When the temperature is slightly lower than the t temperature, a drop of liquid will also crystallize into a solid solution. After solidification of the cold storage plate, a single-phase uniform solid solution is obtained.