In industries such as microelectronics, optoelectronics and biopharmaceuticals, bright annealing (BA), pickling or passivation (AP), electrolytic polishing (EP) and vacuum secondary treatment are generally used for high-purity and clean pipeline systems that transmit sensitive or corrosive media. Dissolved (VIM+VAR) products.
A. Electro-Polished (Electro-Polished) is referred to as EP. Through electrochemical polishing, the surface morphology and structure can be greatly improved, and the actual surface area can be reduced to a certain extent. The surface is a closed, thick chromium oxide film, the energy is close to the normal level of the alloy, and the amount of media is reduced – usually suitable for electronic grade high-purity gases.
B. Bright Annealing (Bright Annealing) is referred to as 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 pipe to improve the morphological structure and reduce the energy level, but does not increase the surface roughness – usually suitable for GN2 , CDA, and non-process inert gases.
C. Pickled & Passivated/Chemically Polished (Pickled & Passivated/Chemically Polished) are referred to as AP and CP. Pickling or passivation of the pipe will not increase the surface roughness, but it can remove the remaining particles on the surface and reduce the energy level, but it will not reduce the number of interlayers – usually used in industrial grade pipes.
D. Vacuum secondary dissolution clean tube Vim (Vacuum Induction Melting) + Var (Vacuum ArcRemelting), referred to as V+V, is a product of Sumitomo Metal Company. It has been processed again under arc conditions in a vacuum state, which effectively improves corrosion resistance and surface roughness. Degree – usually suitable for highly corrosive high-purity electronic grade gases, such as: BCL3, WF6, CL2, HBr, etc.
Post time: Apr-08-2024