The cleaning method of the inner hole of the titanium tube!

Degreasing: After cooling the billet, use a metal degreasing agent to remove the oil on the inside and outside of the pipe. When taking oil, pay attention to check the position where the inner hole is easy to store oil, and ensure complete cleaning. Pickling: The purpose of pickling is to remove the oxide film produced after annealing on the inside and outside of the Grade 1 Titanium Tube. At room temperature, put a certain amount of clear water into the pickling tank, the normal ratio of HNO 3 to HF, HNO 3 and HF water is HF+residual H2O), and adjusted accordingly according to the actual situation.

The pickling time is 10-15 minutes, and it can also be determined according to the pickling situation. During the pickling process, you should often turn around to check to ensure that the pickling is even and complete, and avoid pickling too fast or over pickling. After pickling, The titanium tube is inspected by visual inspection, and the oxide skin on the inside and outside of the titanium tube is removed, the silvery white is removed, and washed.

After pickling and inspection, the titanium tube should be cleaned in time to remove residual acid and pickling materials from the inner hole and outer surface to ensure the details of the titanium tube are bright.

In order to eliminate the influence of the surface oxide film on the hydrogen absorption process, titanium can be heated in vacuum or hydrogen. When heated to 700~850°C, the oxides on the surface of the titanium tube begin to diffuse to the metal, and the hydrogen absorption rate of the titanium heat exchanger tube is greatly improved. However, this method eliminates the oxygen in the oxide film and enters the metal during the heat treatment process, which not only reduces the diffusion rate of hydrogen into the metal, but also causes oxygen to enter the final product, thereby reducing the quality of the product; at the same time, the titanium tube Particles during heat treatment will also cause a certain degree of sintering, reducing their hydrogen absorption rate.