Iron and steel part surface oxidizing method

A technology for surface oxidation and parts, applied in the field of surface oxidation of steel parts and surface treatment of steel parts, can solve the problems of low production efficiency, high production cost, high labor intensity, etc. The effect of reducing labor intensity

Inactive Publication Date: 2003-06-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Molten salt oxidation blackening is carried out in molten nitrate medium, which has serious environmental pollution, is not conducive to health, and consumes a lot of energy, requires a lot of cleaning water, and is being eliminated
Normal temperature blackening is a technology that only emerged from the late 1980s to the early 1990s, but in fact it should not belong to the steel surface oxidation technology, and the treatment process is complicated, the production cost is high, and there is serious environmental pollution. Compared with basic blue, its performance is not stable enough
According to the literature search, Zhou Honghong introduced in the article "Material Protection", July 2002, P.45 "Comparison of blackening methods of steel at room temperature and high temperature", that alkaline oxidation originated in the 1930s, and it was in the presence of oxidant NaNO 2 Iron and steel parts are treated in NaOH alkaline solution at a temperature of 135-150 °C. Although the treatment quality is good, the production process is complex, labor-intensive, serious environmental pollution, and has the disadvantages of high energy consumption and low production efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Parts such as bicycle chains, the material 40Mn is quenched and tempered at 310°C, so the oxidation treatment can be carried out in the device of the present invention with the tempering of the workpiece, and the two ends of the furnace are opened to heat in the air or pass water Steam or spray into KMnO 4 Under the condition of aqueous solution, the surface bluing treatment is carried out at the same time. The chain pieces are to be tumbled beforehand. A uniform and firm blue oxide film can be obtained on the parts treated by the device of the invention, and has certain corrosion resistance and beautiful decoration. A chain factory uses a φ800×7000 tube furnace for production, with an output of 300Kg / h.

Embodiment 2

[0017] Example 2: Many camera parts require the surface to be oxidized to black, and they are processed in a tubular furnace at a temperature of 420°C. A certain amount of steam is introduced, and the tubular furnace tank can rotate slowly, and the inclined ribs in the tank are in front of the furnace. The part can be increased appropriately, so that the parts can be turned more in this part of the area. In order to make the oxide film uniform and beautiful, the parts are rolled beforehand. The oxide film formed on the surface of the workpiece treated by the device is black, and its anti-corrosion performance is equivalent to that of alkaline blackening.

Embodiment 3

[0018] Embodiment 3: a certain part on the textile machine, the surface is required to be processed into light yellow to golden yellow, and it can be processed in a pit furnace after shelving in a certain way. A drip injector or a spray gun is arranged on the furnace, and the nitrogen tail gas (rich in nitrogen) is exhausted in the furnace. Oxygen) or an appropriate amount of drip (jet) KMnO 4 Aqueous solution, furnace temperature 220 / 240°C. There are fewer workpieces, and those with an appropriate size can also be carried out in a box furnace, and the preparation of sprayed KMnO 4 Solution spray gun. The color of the treated parts is beautiful (light yellow), and it is not easy to rust.

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PUM

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Abstract

There is an oxidation method of steel part surface, it belongs to the heat treatment technology and environmental protection field. The method is: the oxidition treatment is carried on in air stove, or adds in substance which isn't polluted, the color of the part mainly lies on the temperature, it acquires yellow, golden yellow, wine, blue, sandy beige, black oxidation film between 220 degree C -420 degree C. The craft in the ivnention tallies with clean production and green heat treatment.

Description

technical field [0001] The invention relates to a surface treatment method for steel parts, in particular to a surface oxidation method for steel parts, belonging to the fields of heat treatment technology and environmental protection. Background technique [0002] The bluing or blackening of the surface of steel parts is a method of forming a layer of blue or blue-black oxide film or other black films on the surface of the parts. At present, there are three main processes used for this technology: molten salt oxidation blackening, alkaline oxidation and room temperature blackening. Molten salt oxidation blackening is carried out in molten nitrate medium, which has serious environmental pollution, is not conducive to health, and consumes a lot of energy, requires a lot of cleaning water, and is being eliminated. Normal temperature blackening is a technology that only emerged from the late 1980s to the early 1990s, but in fact it should not belong to the steel surface oxidat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/14
Inventor 胡明娟张伟民施省时朱祖昌
Owner SHANGHAI JIAO TONG UNIV
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