Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Patent
1997-05-29
1999-08-31
Simmons, David A.
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
148241, 205320, 420 50, 420 62, 420 79, 420 80, 420 98, 420103, 420117, 420119, 4284722, C23C 800
Patent
active
059449179
ABSTRACT:
A stainless steel having excellent corrosion resistance to ozone added water, such as ozone added ultrapure water used in semiconductor manufacturing processes and the like, as well as a manufacturing method. The stainless steel comprises a base metal and an oxide film formed on the surface of the base metal, the base metal being a stainless steel which contains 12 to 30% of Cr, 0 to 35% of Ni, and 1 to 6% of Al and Si while the contents of the other alloying elements are limited to as low a level as possible, the oxide film mainly comprising Al oxide or a Si oxide or both. The oxide film may be formed on the base metal surface through the dry oxidation process or the wet oxidation process. In the stainless steel, metallic ions are rarely dissolved from the base metal into the ozone added water. Also, since the contents of alloying elements, other than Cr, Ni, Al, Si, and like necessary elements, are limited to a low level, the stainless steel exhibits excellent corrosion resistance and reduced particle emission.
REFERENCES:
patent: 4661169 (1987-04-01), Aggen et al.
"Handbook of Stainless Steels", Peckner and Bernstein; McGraw-Hill Book Company, New York; Chapter 16: Corrosion Resistance in Aqueous Media, pp. 16-1 to 16-5, 1977.
Azuma Shigeki
Matsuda Yasushi
Nishiyama Yoshitaka
Takeda Kiyoko
Tarutani Yoshio
Koehler Robert R.
Simmons David A.
Sumitomo Metal Industries Ltd.
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