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Technique for improving color uniformity of alloy steel bluing coating effectively

A process method, alloy steel technology, applied in the direction of metal material coating process, etc., can solve problems such as inapplicability

Inactive Publication Date: 2015-11-11
XIAN AEROSPACE PROPULSION TESTING TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the face of alloy steel parts with high requirements on the uniformity of the appearance and color of the bluish film layer, the problem of reddish-brown rust spots on the surface of the parts after bluish treatment cannot be completely overcome by adjusting the composition of the strong oxidant, and the adjusted strong oxidant will affect the Problems that work for some parts but not for others

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] For alloy structural steel 30CrMnSiA parts, 80# glass beads are first selected as abrasives, the working pressure of the spray gun is 0.6-0.8MPa, the medium is transformer oil, and the parts are subjected to liquid shot peening treatment. The surface of the parts after shot peening is matte. Then carry out conventional surface bluing treatment on the parts, including workpiece clamping → degreasing → cleaning → pickling → cleaning → oxidation → cleaning → saponification → hot water boiling and washing → inspection, the appearance of the oxide film of the parts after bluing is no Glossy blue-black, evenly colored.

[0025] In addition, the size of the parts before shot peening and after shot peening and bluing treatment, as well as the thread accuracy were tested, and the maximum change in the part size was only 0.01mm, indicating that the selected shot peening process has no effect on the part size and thread accuracy, and will not Cause the part size to be out of toler...

Embodiment 2

[0028] For alloy structural steel 30CrMnSiA parts, according to the conventional surface bluing treatment process, perform workpiece clamping → degreasing → cleaning → pickling → cleaning steps, and then perform liquid shot peening on the parts. The liquid shot peening step uses 80# glass beads As an abrasive, the working pressure of the spray gun is 0.6-0.8MPa, the medium is water, the liquid is shot peened and cleaned, and then proceeds to oxidation→cleaning→saponification→hot water boiling→inspection, and the blued oxide film of the part is obtained The appearance is dull blue-black with uniform color.

[0029] And the size of the parts before shot peening and after shot peening and bluing treatment and the thread accuracy are tested. The maximum change of the part size does not exceed 0.01mm, indicating that the selected shot peening process has no effect on the part size and thread accuracy, and will not Cause the part size to be out of tolerance. Moreover, the corrosion...

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PUM

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Abstract

The invention provides a technique for improving the color uniformity of an alloy steel bluing coating effectively. The step of wet spraying pellet is added before conventional bluing treatment or in the bluing treatment process, thereby unifying the surface processing state of parts before the bluing treatment and meeting the demand of color uniformity of the bluing coating appearance. Moreover, in the step of wet spraying pellet, 80# glass micro-beads are selected to serve as abradants, and the working pressure of a spray gun is 0.6-0.8 MPa. The maximum size variation of the parts is 0.01 mm after the step of wet spraying pellet under the technical parameter, and the parts can meet the precision requirement.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of alloy steel parts, in particular to a process method for effectively improving the color uniformity of the bluing film layer of alloy steel. Background technique [0002] It is a conventional surface treatment process for steel parts to carry out bluing treatment on the surface of steel parts (such as alloy steel). The bluing treatment process uses a strong oxidant to oxidize the surface of the steel piece into dense and smooth ferric oxide to improve the rust resistance of the steel piece. The strong oxidizing agent used is generally composed of sodium hydroxide, sodium nitrite, and trisodium phosphate. During the bluing treatment, the steel parts are treated with a molten solution of a strong oxidizing agent. The process flow of bluing treatment is: workpiece clamping→degreasing→cleaning→pickling→cleaning→oxidation→cleaning→saponification→hot water boiling→inspection. [0003] Aft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/78
Inventor 赵振飞楚治国苏红兵李军前
Owner XIAN AEROSPACE PROPULSION TESTING TECH RES INST