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High-temperature bluing method of long and large part

A part, high temperature technology, applied in the direction of metal material coating process, etc., can solve the problems of easy alkali corrosion, poor bluing quality, etc., and achieve the effect of easy turning operation, ensuring stability, and ensuring firmness.

Active Publication Date: 2010-12-22
WUHAN MARINE MACHINERY PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and problems existing in the prior art that the bluing quality of long parts is poor and alkali corrosion is easy to occur, and to provide a kind of bluing quality of long parts that is good and not prone to alkali High temperature bluing method for long parts with corrosion phenomenon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0063] Part name: synchronous shaft, part material: 40Cr, external dimension: Φ220×6390mm.

[0064] The high-temperature bluing method of the long parts comprises the following steps in turn:

[0065] The first step: place the support: first place the support at the bottom of the bluing tank. The support is a structure with one end high and one end low. The inclination angle between the low end and the high end and the bottom of the bluing tank is 10 degrees. The distance between the low end and the bottom of the bluing groove is 10cm, and the contact surface on the support that contacts the long parts is arc-shaped;

[0066] Step 2: Prepare bluing solution: firstly determine the predetermined bluing temperature and predetermined bluing time according to the raw materials of the large parts that need to be blued, that is, the predetermined bluing temperature is 140-145°C, and the predetermined bluing time is 60-- 90 minutes, then prepare the bluing liquid in the bluing tank, ...

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PUM

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Abstract

The invention discloses a high-temperature bluing method of a long and large part, which comprises: placing a support on the bottom of a bluing tank, determining a preset bluing temperature and preset bluing time, preparing bluing solution, aging the bluing solution, preheating the washed long and large part, placing the preheated part on the support for bluing, setting the temperature of the bluing solution when the part enters the tank at the highest value of the preset bluing temperature, taking the part out of the tank slowly after the bluing is finished, washing the surface of the part with at least three water heads at the same time, transferring the part to a clear water tank after the part is taken out of the tank completely, washing off the alkaline bluing solution on the surface of the part completely, placing the long and large part washed completely by clear water on a wooden sleeper with a wrapping cloth pad, checking the long and large part, and applying oil onto the long and large part is the long and large part is qualified. The method has the advantages that: the structure is simple; the operation is simple and the washing effect is good; and a high-quality blued film can be formed on the long and large part conveniently, and the blued film is more compact, firmer and more alkaline corrosion resistant.

Description

technical field [0001] The invention relates to a high-temperature bluing method, in particular to a high-temperature bluing method for long parts, and is particularly suitable for high-temperature bluing of long parts with a length of more than two meters. Background technique [0002] Bluing refers to the material protection technology that heats steel in the air or directly immerses it in a concentrated oxidizing solution to produce a very thin oxide film on the surface, also known as blackening. The blueing of steel parts can be carried out in the molten salt of sodium nitrite and sodium nitrate, or in high temperature hot air and superheated steam above 500 ° C, more commonly used in concentrated caustic soda with sodium nitrite heating. The solution composition, reaction temperature and time when turning blue depend on the composition of the steel matrix. The composition of the blue film is magnetic iron oxide, the thickness is 0.5-1.5 microns, the color is related t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/62C23C22/73
Inventor 张春晖
Owner WUHAN MARINE MACHINERY PLANT
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