| 摘要 |
A corrosion resistant stainless steel article is provided with a substantially uniform black oxide coating over the surface thereof, the article being formed from a steel alloy in martensitic structure which is treated in a boiling aqueous alkaline-chromate-oxidizing solution containing sodium hydroxide, sodium nitrate and sodium dichromate at a temperature in the range from about 230 DEG F. to about 260 DEG F. for 30 to 60 minutes.
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