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nature : also known as the Blue Shaolan and roasted. Usually the use of alkaline oxidizing solution of oxidation in steel in the form on the surface layer of blue black or dark blue iron oxide film method. Used to increase corrosion resistance, shiny and beautiful. Widely used machine parts, precision instruments, optical instruments, watches and parts and weapons manufacturing industries. General removed by the first oil and oxidation Paper into a wire basket, immersed in sodium hydroxide and sodium nitrite by night and alkaline oxidizing solution, the temperature of 135 to 145 ° C. Then use hot water to clean with soap and dry after treatment, reuse or spindle oil transformer oil treatment derived.
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