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A method for improving corrosion resistance of titanium nitride-titanium oxide composite coating

A composite coating and titanium oxide technology is applied in the field of improving the corrosion resistance of titanium nitride-titanium oxide composite coatings and improving the corrosion resistance of coatings, which can solve the problems affecting the corrosion resistance of coatings and limit the application of plasma spray coatings and other problems, to achieve the effect of improving corrosion resistance, wide applicability, and reducing porosity

Active Publication Date: 2021-04-09
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its forming characteristics, plasma sprayed coatings inevitably produce defects such as pores and cracks, which seriously affect the corrosion resistance of the coating and limit the application of plasma sprayed coatings in industry.

Method used

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  • A method for improving corrosion resistance of titanium nitride-titanium oxide composite coating
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  • A method for improving corrosion resistance of titanium nitride-titanium oxide composite coating

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Effect test

preparation example Construction

[0035] Preparation of titanium nitride-titanium oxide composite coating:

[0036] A titanium nitride-titanium oxide composite coating with a thickness of about 500 μm was prepared on the surface of the metal workpiece by using the 3710 plasma spraying system of the American PRAXAIR company. The spraying powder is 99.4% pure titanium powder. The main gas, auxiliary gas and carrier gas used for spraying are argon, helium and nitrogen respectively. The spraying power is 28kW and the spraying distance is 140mm. See attached figure 1 .

Embodiment 1

[0038] A method for improving the corrosion resistance of titanium nitride-titanium oxide composite coatings, comprising the following steps:

[0039] S1. Use a silicone resin sealing agent and dipping method to conduct the first sealing treatment on the above coating.

[0040] At room temperature, immerse the workpiece in the silicone resin sealing agent, take it out after 50 minutes, dry it in the air for 20 minutes, and then put it in a DGG-9070B oven to cure at 110°C for 30 minutes.

[0041] S2. Heat treatment of the above-mentioned composite coating. The heat treatment is carried out in a SX2-5-12 box-type resistance furnace. The heat treatment temperature is 300°C. After holding time for 2 hours, it is cooled with the furnace.

[0042] The main functions of heat treatment are:

[0043] (1) Heat treatment oxidizes and decomposes part of the titanium nitride in the titanium nitride-titanium oxide composite coating to generate Ti 2 O, Ti 3 O and TiO 2 ; see attached fi...

Embodiment 2

[0052] A method for improving the corrosion resistance of titanium nitride-titanium oxide composite coatings, comprising the following steps:

[0053] S1. Use a silicone resin sealing agent and dipping method to conduct the first sealing treatment on the above coating. At room temperature, immerse the workpiece in the silicone resin sealing agent, take it out after 60 minutes, dry it in the air for 20 minutes, and then put it in a DGG-9070B oven to cure at 110°C for 20 minutes.

[0054] S2. Heat treatment of the above-mentioned composite coating. The heat treatment is carried out in a SX2-5-12 box-type resistance furnace. The heat treatment temperature is 400°C. After holding time for 2 hours, it is cooled with the furnace.

[0055] Heat treatment oxidizes and decomposes part of the titanium nitride in the titanium nitride-titanium oxide composite coating to produce Ti 2 O, Ti 3 O and TiO 2 , so that the solidified sealant transforms into amorphous SiO 2 , see attached figu...

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Abstract

The invention discloses a method for improving the corrosion resistance of a titanium nitride-titanium oxide composite coating, which comprises using a sealing agent to seal the titanium nitride-titanium oxide composite coating on a workpiece for the first time, drying and curing; The composite coating is heat-treated, kept warm and then cooled; and then the heat-treated composite coating is sealed with a sealing agent to obtain a workpiece with a corrosion-resistant coating. Comprehensive post-treatment of the coating by adopting a combination of sealing treatment and heat treatment; the heat treatment oxidizes and decomposes part of the titanium nitride, makes the volume expand and improves the compactness of the coating, and at the same time eliminates or reduces the internal stress of the composite coating; and makes The organic matter and low-melting point phases in the silicone sealant are burned out, so that the solidified sealant turns into amorphous SiO 2 ; While improving the sealing effect of the coating, the corrosion resistance of the sealing material itself is improved, thereby improving the overall corrosion resistance of the coating and prolonging the service life, especially for sprayed coatings.

Description

technical field [0001] The invention relates to a method for improving the corrosion resistance of a coating, in particular to a method for improving the corrosion resistance of a titanium nitride-titanium oxide composite coating, and belongs to the technical field of metal material protection. Background technique [0002] Titanium nitride / titanium oxide composite coating has the characteristics of high hardness, high melting point, wear resistance and corrosion resistance, and is widely used in mechanical processing and aerospace and other fields. [0003] The protective effect of the titanium nitride / titanium oxide composite coating on the substrate is mainly based on mechanical barriers. The titanium nitride / titanium oxide composite coating can be obtained on the surface of carbon steel by reactive plasma spraying technology. However, due to its forming characteristics, plasma sprayed coatings inevitably produce defects such as pores and cracks, which seriously affect th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/10C23C4/134C23C4/18
CPCC23C4/10C23C4/18C23C4/134
Inventor 王泽华张宇石颖张欣周泽华江少群王刚
Owner HOHAI UNIV