The surface of the titanium turns blue
Thread Content
The drum of the centrifuge is made of titanium, grade TA2; the medium used is a methanol-hydrogen chloride solution, and the operating temperature is around 5 degrees Celsius. The device has been in use for two months, and upon inspection it was found to have this color. The reason for this is not clear; I would appreciate it if fellow users could help analyze and provide guidance. Thank you
What is your hydrogen chloride concentration? . . . . . . If it’s convenient, add us
The protection during the welding process is inadequate; it’s common to see the weld area turn blue. I really don’t understand this. Please, dear friends, help analyze it. Thank you
It generally occurs when the inert gas protection is inadequate during the welding process. Above 400 degrees, it absorbs O to form Ti2O3, which is blue
All of the above are correct answers. I’ve seen this color before; it’s caused by an inadequate shielding gas during welding. In cases like yours, it’s very likely that the temperature inside is high, and there may be elements such as oxygen mixed in.
A key technical expert from a titanium equipment manufacturing company with over 20 years of experience told me that it’s caused by fire. Previously, I worked on producing components for the GK LB centrifuge drum for Jingjiang Saideli; when bending the parts, heating was required first, and both the inner and outer surfaces had to be machined away so that no blue marks would remain on the drum. Could you please tell me the manufacturer of your centrifuge and what model it is?
It was not caused by welding, nor by heating. For the most basic type of curling like this, it is heated during the process, but once the blueing occurs as a result of heating, that blue color is removed. I guess this happened after the equipment started operating.
The working environment is nitrogen-sealed, with an oxygen content of less than 1%; the operating temperature is around 5 degrees Celsius. The materials used are methanol and hydrogen chloride, so high temperatures are not possible
Have you all seen this type of operating condition? Why does it turn blue? Six or seven years ago, a device behaved in the same way; I never understood why