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[Principle] Generally, steel is easy to rust. If the surface of the steel parts is baked blue, the corrosion resistance can be greatly enhanced and the service life can be prolonged. Like weapons, springs, steel wires, etc., this method is commonly used to protect. Iron in a mixed solution containing oxidant and caustic soda, after a certain time at a certain temperature, react to form sodium ferrite (Na2FeO2) and sodium ferrite (Na2Fe2O4), and sodium ferrite and sodium ferrite interact to form four Oxidation of triiron oxide film. The reaction equation is: 3Fe+NaNO2+5NaOH=3Na2FeO2+H2O+NH3↑ 8Fe+3NaNO3+5NaOH+2H2O=4Na2Fe2O4+3NH3↑Na2FeO2+Na2Fe2O4+2H2O=Fe3O4+4NaOH This layer of oxide film is black or black blue, it The structure is compact and has strong corrosion resistance. [ supplies] iron (or nail), tripod, asbestos net, alcohol lamp, measuring cylinder, watch glass, beaker, tweezers, table balance, thermometer, sandpaper; sodium hydroxide, sodium carbonate, water glass, dilute sulfuric acid, sodium nitrate , sodium nitrite, potassium dichromate solution, engine oil. [Operation] (1) Take 10g of sodium hydroxide, 4g of sodium carbonate, 1g of water glass, add 100mL of water, and prepare a degreasing liquid; take 50g-60g of sodium hydroxide, 10g of sodium nitrate, 3g of sodium nitrite, add 100mL of water Dissolve into a roasted blue liquid. (2) The iron piece is polished with sandpaper, then placed in a beaker containing 20 mL of degreasing liquid, heated and boiled for 5 min to 10 min, then taken out with tweezers and washed with water. (3) The iron piece after the surface is degreased is immersed in a descaling liquid (15% dilute sulfuric acid) and heated (60 ° C ~ 80 ° C) to remove rust. After about 2 min, it is taken out and washed. (4) The iron piece after degreasing and degreasing is placed in a beaker containing 20 mL of roasted blue liquid, heated and boiled for about 20 minutes, then taken out with tweezers, rinsed with water and dried, and there is a layer of black blue or black on the iron piece. Dense oxide film. (5) Although the surface oxide film after oxidation treatment is relatively tight, there are still minute pores. In order to improve the corrosion resistance, the oxidized iron piece may be placed in a 3% to 5% potassium dichromate solution (90 ° C to 95 ° C) for about 10 minutes to fill or passivate the loose pores, and then reposition The pores were filled in the hot oil (105 ° C ~ 110 ° C) for about 5 min. (6) Dip the iron sheet after baking blue in a 2% copper sulfate solution, remove it at room temperature for 20 s, remove the surface, and wash the surface with water. If the red contact point does not appear, it means that the blue is qualified.
Posting the information on the baked blue process, I hope to help everyone.
Baked blue method alkaline oxidation method "baked blue" liquid 1. Formula: Sodium nitrate 50 ~ 100 grams of sodium hydroxide 600 ~ 700 grams of sodium nitrite 100 ~ 200 grams of water 1000 grams 2. Method: After metering according to the formula, under the stirring conditions, the materials are added to them in turn, dissolved, and mixed uniformly. 3. Note: (1) The metal surface must be washed and dried before the “baked blue†treatment can be performed. (2) The "baked blue" processing conditions of the metal device are related to the carbon content in the metal. The "baked blue" liquid temperature and the processing time of the metal device therein can be referred to the following table. The carbon content in the metal% working temperature (°C) treatment time (minutes) starts to terminate>0.7135-13714310-300.5-0.7135-14015030-50<0.4142-145153-15540-60 alloy steel 142-145153-15560-90 (3) The content of sodium nitrate, sodium nitrite and sodium hydroxide in the solution was analyzed on a regular basis every week or so to promptly replenish the relevant ingredients. The solution should be replaced after half a year. (4) After the metal “baked blue†treatment, it is best to rinse with hot soapy water for a few minutes, then rinse with cold water. Then, rinse with hot water and blow dry. Acid oxidation "baked blue" liquid 1. Formula: Phosphoric acid 3 ~ 10 grams of calcium nitrate 80 ~ 100 grams of manganese peroxide 10 ~ 15 grams of water 1000 grams 2. Method: After metering according to the formula, under the condition of constant stirring, phosphoric acid, manganese peroxide and calcium nitrate are added to it in sequence, dissolved and mixed uniformly. 3. Description: (1) The metal device can be washed and dried before it can be “baked blueâ€. (2) The protective film obtained by this method is black, and its main component is composed of calcium phosphate and iron oxide, and its corrosion resistance and mechanical strength exceed the protective film obtained by the alkaline oxidation method. 4. "Baked blue" working temperature is 100 ° C, processing time is 40 ~ 45 minutes. When processing carbon steel, the phosphoric acid content in the chemical solution is controlled at 3 to 5 g / liter; when the alloy steel or cast steel is treated, the phosphoric acid content is controlled at 5 to 10 g / liter. Attention should be paid to the regular analysis of the content of phosphoric acid in the liquid. 5. The cleaning method of the metal device after the "baked blue" treatment is the same as above.
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