Introduction of electronic grade high purity gas pipeline
Microelectronics, optoelectronics, and biopharmaceutical industries generally use bright annealing (BA), pickling or passivation (AP), electrolytic polishing (EP), and vacuum secondary dissolved (VIM + VAR) product, for high-purity and clean pipeline systems with transmitting sensitive or corrosive media.
A. Electro-Polished for short EP. By electrochemical polishing, the surface morphology and structure can be greatly improved, and the actual area of the surface layer can be minimized. The surface is a closed, thick chromium oxide film, the energy is close to the normal level of the alloy, and the number of media will be reduced to minimum. So it is usually suitable for electronic grade high purity gases.
B. Bright Annealing for short BA. High-temperature heat treatment in hydrogenation or vacuum state, on the one hand, eliminates internal stress, and on the other hand, forms a passivation film on the surface of the pipeline to improve the morphological structure and reduce the energy level, but does not increase the surface roughness. So it is used for GN2 , CDA, and non-process inert gases.
C. Pickled & Passivated / Chemically Polished for short AP or CP. Pipes that have been pickled or passivated will not improve surface roughness, but will remove particles on the surface and reduce energy levels, but will not reduce the number of interposers. It is usually used as industrial grade pipes.
D. Vacuum Induction Melting + Vacuum ArcRemelting is abbreviated as V V. It is a patented product of Sumitomo Metal. It is processed again under arc and vacuum conditions, which effectively improves corrosion resistance and surface roughness . It is usually suitable for highly corrosive and high-purity electronic grade gases, such as: BCL3, WF6, CL2, HBr, etc.