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Surface treatment method for thermally-sprayed inorganic coating

An inorganic coating and surface treatment technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of poor solution corrosion resistance and large porosity of thermal sprayed inorganic coatings, and improve the resistance to corrosion. Solution corrosion performance, effect of improving high temperature oxidation resistance

Inactive Publication Date: 2014-03-26
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using its anti-corrosion function, due to the large porosity of the coating obtained by thermal spraying technology, the interconnected voids constitute the short-circuit channel of the corrosive medium, so the directly used coating only shows limited anti-corrosion performance , the solution corrosion resistance of thermal sprayed inorganic coatings is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare 0.5mol / L of Zr(NO 3 ) 4 weak. Thermally sprayed ZrO 2 The coated 40 carbon steel sample is cleaned and installed on the deposition equipment filled with the above solution, the inert electrode is installed, the distance between the electrode and the sample is adjusted, the power is turned on, and the current density is set to 2A / m 2 , deposited for 2 minutes, took out the sample, dried in air at room temperature for 15 minutes, placed in a heating furnace at 350°C for 30 minutes, then cooled to room temperature, and then repeated the above electrodeposition, drying and heat treatment process 4 times to achieve Thermally sprayed ZrO 2 Coating sealing treatment.

[0031] Thermally sprayed ZrO before and after electrolytic deposition sealing treatment 2 The samples were electrochemically tested in 3.5% NaCl aqueous solution. The results show that the ZrO after electrodeposition sealing treatment 2 The self-corrosion potential of the polarization curve of the...

Embodiment 2

[0033] Prepare 0.5mol / L Al(NO 3 ) 3 Aqueous solution, will thermally spray Al 2 o 3 The coated stainless steel sample is cleaned and installed on the deposition equipment filled with the above solution, the inert electrode is installed, the distance between the electrode and the sample is adjusted, the power is turned on, and the current density is set to 3A / m 2 , deposited for 2 minutes, took out the sample, dried in air at room temperature for 15 minutes, placed in a heating furnace at 350°C for 30 minutes, then cooled to room temperature, and then repeated the above electrodeposition, drying and heat treatment process twice to achieve For thermal spraying Al 2 o 3 Coating sealing treatment.

[0034] Thermal sprayed Al before and after electrolytic deposition sealing treatment 2 o 3 The coupons were subjected to a 200-hour cyclic oxidation test at 800°C and 900°C. The results show that the sample after electrolytic deposition sealing treatment has lower oxidation wei...

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PUM

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Abstract

The invention discloses a surface treatment method for a thermally-sprayed inorganic coating. By the surface treatment method, the solution corrosion resistance of the thermally-sprayed inorganic coating can be improved. The surface treatment method comprises the following steps: fixing a test sample part with the thermally-sprayed inorganic coating between two noble electrodes; communicating the test sample part with the two noble electrodes respectively, and placing the test sample part and the two noble electrodes in a conductive soluble metal salt solution for electrolytic deposition treatment; taking the test sample part out of the conductive soluble metal salt solution after a certain time of electrolytic deposition treatment, drying the test sample part at room temperature, slowly heating the test sample part to 300 to 400 DEG C in the air, preserving heat for 20 to 40 minutes, and cooling the test sample part to room temperature to realize the leakage sealing treatment of the whole thermally-sprayed inorganic coating. According to the method, the solution corrosion resistance and high temperature oxidation resistance of the thermally-sprayed inorganic coating are improved; the method is suitable for popularization and application in the technical field of preparation post-treatment and repair for coatings.

Description

technical field [0001] The invention belongs to the technical field of post-treatment and repair of coating preparation, and in particular relates to a surface treatment method for thermal spraying inorganic coating. Background technique [0002] The use of thermal spraying technology to prepare inorganic coatings such as oxides on metal surfaces is a commonly used surface protection treatment method. The obtained inorganic coating can take advantage of its functions of wear resistance, corrosion resistance and heat insulation. When using its anti-corrosion function, due to the large porosity of the coating obtained by thermal spraying technology, the interconnected voids constitute the short-circuit channel of the corrosive medium, so the directly used coating only shows limited anti-corrosion performance , The solution corrosion resistance of thermal sprayed inorganic coatings is poor. Contents of the invention [0003] The technical problem to be solved by the present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/02C23C4/18C23F17/00
Inventor 张鲲赵君文胡琪刘莉韩靖戴光泽
Owner SOUTHWEST JIAOTONG UNIV