A process in which steel or steel is heated to a suitable temperature in air-steam or chemical to form a blue or black oxide film on the surface. Also known as black. The oxide film formed on the surface of the ferrous metal after "blue bluing" treatment has an outer layer mainly composed of triiron tetroxide and an inner layer of ferrous oxide. Definition A process in which steel or steel is heated to a suitable temperature in air-steam or chemical to form a blue or black oxide film on its surface. Also known as black. The oxide film formed on the surface of the ferrous metal after "blue bluing" treatment has an outer layer mainly composed of triiron tetroxide and an inner layer of ferrous oxide.
Hebei Xinteli specilizes in producing and exporting Wire Mesh over 10 years. Bamboo Dream brand wire mesh is made of high quality iron wire through automatic process and sophisticated technique. The end product is level and flat with sturdy structure. Xinteli Wire Mesh category includes Welded Wire Mesh,Welded Wire Netting, Hexagonal Wire Mesh, gabions, square wire mesh,Wire Mesh Fence Panel; stainless steel wire mesh etc. Xinteli Wire Mesh is extensively used in industry and agriculture; building; transportation and mining for all such purposes as poultry house; egg baskets; runway enclosures; draining rack; fruit drying sreen fence.
Application range The blue color of steel parts can be carried out in the molten salt of sodium nitrite and sodium nitrate. It can also be carried out in hot air at high temperature and superheated steam above 500 °C. More commonly, it is concentrated in the presence of sodium nitrite. Heat in sodium. The composition of the solution, the reaction temperature and the time when the blue color is determined depends on the composition of the steel substrate. The blue film is made of magnetic iron oxide and has a thickness of 0.5 to 1.5 microns. The color is related to the material composition and process conditions, such as grayish black, dark black, and bright blue. The separate blue film has poor corrosion resistance, but after oiling or varnishing, both corrosion resistance and friction resistance are improved. When blue is emitted, the size and finish of the workpiece have little effect on the quality. Therefore, it is often used in precision instruments, optical instruments, tools, hardness blocks, etc.
"Blue" liquid alkaline oxidation method "blue" liquid
Alkaline oxidation or acid oxidation is used; an oxide film is formed on the surface of the metal to prevent corrosion of the metal surface. This process is called "blue".
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. Description:
(1) The metal surface must be washed and dried before it can be "bluened".
(2) The "blue" processing conditions of the metal device are related to the carbon content in the metal. The "blue" liquid temperature and the processing time of the metal device can be referred to the following table. The carbon content in the metal% working temperature (°C) treatment time (minutes) begins to terminate>0.7135-13714310-300.5-0.7135-14015030-50
(3) Analyze the content of sodium nitrate, sodium nitrite and sodium hydroxide in the solution every week or so to supplement the relevant ingredients in time. The solution should be replaced after half a year.
(4) After the metal “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 "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 is washed and dried before it can be "bluened".
(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. "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 "blue" treatment is the same as above.
“Blue†is mainly made of carbon steel, 45# steel is “black†and then black; 30Crmnsi is “blue†and brown.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
Wire Mesh
Galvanized Wire Mesh,Hexagonal Wire Mesh,Welded Wire Netting,Welded Wire Mesh,Wire Mesh Fence Panel,PVC coated Wire Mesh
Hebei Xinteli Co., Ltd. , http://www.sinohardwares.com