Repairing method of 2Cr12NiMo1W1V blade surface Al coating

A repair method and blade technology, applied in the direction of coating, metal material coating process, improvement of process efficiency, etc., can solve the problems of incomplete Al coating, fluid medium corrosion, blade size out of tolerance, etc., to achieve convenient operation, The effect of good use effect and broad application prospect

Inactive Publication Date: 2014-06-25
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Al coating of 2Cr12NiMo1W1V compressor blades will be incomplete after a period of use, and the fluid medium will corrode and erode the base material, causing the blades to be scrapped
Existing coating removal methods include: pickling chemical reaction method and mechanical processing removal method, but these two methods will cause over-corrosion of the substrate or out-of-tolerance phenomenon of blades when removing the coating.

Method used

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  • Repairing method of 2Cr12NiMo1W1V blade surface Al coating
  • Repairing method of 2Cr12NiMo1W1V blade surface Al coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Wash and dry the 2Cr12NiMo1W1V blades to be repaired;

[0031] (2) Use chemical methods to remove the original coating: heat the coating removal bath with a concentration of 90g / l to 80°C, and place the 2Cr12NiMo1W1V blades sprayed with Al coating to be treated in the coating removal bath to stand still 60min;

[0032] (3) Take out the treated blades, rinse the remaining tank liquid with tap water, and use 180# white corundum sand to blast the surface of the blades until the blade surface shows a metallic luster and there is no visible coating residue.

[0033] (4) Use visual inspection combined with magnetic particle inspection to inspect blades for defects.

[0034] (5) Preparation of new coating: A new coating is prepared on the surface of the blade by manual spraying, and the prepared blade is placed in a heat treatment furnace at 360°C for 60 minutes.

[0035] In order to compare the difference between the performance of the 2Cr12NiMo1W1V blade surface repair Al coating...

Embodiment 2

[0044] (1) Wash and dry the 2Cr12NiMo1W1V blades to be repaired;

[0045] (2) Use chemical methods to remove the original coating: heat the coating removal bath with a concentration of 80g / l to 70℃, and place the 2Cr12NiMo1W1V blades sprayed with Al coating to be processed in the coating removal bath to stand still 80min;

[0046] (3) Take out the treated blade, rinse the remaining tank liquid with tap water, and use 150# white corundum sand to sandblast the surface of the blade until the surface of the blade is metallic and there is no visible coating residue.

[0047] (4) Use visual inspection combined with magnetic particle inspection to inspect blades for defects.

[0048] (5) Preparation of new coating: Prepare a new coating on the surface of the blade by manual spraying, and place the coated blade in a heat treatment furnace at 400°C for 50 minutes.

Embodiment 3

[0050] (1) Wash and dry the 2Cr12NiMo1W1V blades to be repaired;

[0051] (2) Use chemical methods to remove the original coating: heat the coating removal bath with a concentration of 100g / l to 90°C, and place the 2Cr12NiMo1W1V blades sprayed with Al coating to be treated in the coating removal bath to stand still 50min;

[0052] (3) Take out the treated blade, rinse the remaining tank liquid with tap water, and use 120# white corundum sand to sandblast the surface of the blade until the surface of the blade shows a metallic luster and there is no visible coating residue.

[0053] (4) Use visual inspection combined with magnetic particle inspection to inspect blades for defects.

[0054] (5) Preparation of new coating: Prepare a new coating on the surface of the blade by manual spraying, and place the coated blade in a heat treatment furnace at 300°C for 60 minutes.

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Abstract

The invention provides a preparing method of 2Cr12NiMo1W1V blade surface Al coating, comprises the following steps: cleaning and drying the to-be-repaired blade, soaking the blade in a sodium hydroxide aqueous solution at temperature of 70-90 DEG C and concentration of 80-100g/l, reacting for 50-80min, taking out the blade, washing residual bath solution on the blade by using tap water, performing sand blasting on the blade surface by using white emery, checking defect of blade, and preparing new Al coating by using a manual coating mode. The method provided by the invention overcomes the problems that the size of the blade manufactured by using a machining method is out of tolerance and the acid pickling can corrode the substrate; the size of the blade is precisely guaranteed to meet the design standard, the reuse rate of the reworking blade is improved; the cleanliness of the blade surface is guaranteed, and the combining strength of the coating and the blade is improved; the blade repaired by the method is good in use effect, the corrosion resistance, the coating roughness and the combining strength meet the design requirements, the production cost is low, the operation is convenient, and the application prospect is wide.

Description

Technical field [0001] The invention belongs to the field of surface treatment, and particularly relates to a method for repairing a functional coating, in particular to a method for repairing an Al coating on the surface of a 2Cr12NiMo1W1V blade. Background technique [0002] The internal parts of the compressor need to be overhauled after a period of use, especially the coal compressor. Because the fluid medium contains sulfur compounds and tiny solid particles, the corrosion of the blades in the coal compressor is more serious. During the maintenance process, the blades that do not meet the design requirements need to be repaired and reach the design standards before they can be put into use again. Therefore, optimizing the repair process of the blade coating and increasing the qualified rate of repair of the blade are of great significance to improve the service life of the blade and reduce the production cost. [0003] In order to improve the service life of the compressor bl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C23F1/36C23C4/08C23C4/12C21D9/00
CPCY02P10/20
Inventor 李秀丽姜英林亮陈瑞芳龙正茂娄霞周科
Owner DONGFANG TURBINE CO LTD
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