Unlock instant, AI-driven research and patent intelligence for your innovation.

A preparation method for composite coatings used in high-temperature, high-chlorine, and high-scouring environments

A technology of composite coating and intermediate coating, which is applied in the direction of coating, metal material coating process, molten spraying, etc., can solve the problems of high corrosion rate, unsatisfactory, corrosion, etc., and achieve simple preparation process and low cost Effect

Active Publication Date: 2020-11-20
WANHUA CHEM GRP CO LTD +1
View PDF20 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Patent CN103045982A discloses a special arc spraying wire material for amorphous nanocrystals resistant to high chlorine corrosion, which mainly contains Fe, Cr, Mo, W, B. After arc spraying, an amorphous alloy structure is obtained on the surface, and its corrosion resistance is It is about 1.5 times that of Inconel625. It has been verified by experiments that the corrosion rate of Inconel625 is as high as 2mm / a in a high-temperature erosion and oxidation environment. This wire also cannot meet the above-mentioned harsh environment.
[0009] The study found that high temperature chlorine corrosion has repeating characteristics, as long as there is HCl, Cl 2 , chloride, etc., the corrosion will continue, and the passivation film on the surface will be continuously destroyed and peeled off under the condition of solid erosion, resulting in continuous corrosion
Although there are a large number of literature reports on the protection methods of high-temperature chlorine corrosion, there will still be severe corrosion in the high-temperature, high-chlorine and high-washing environment, especially in the incinerator device for the preparation of chlorine gas by catalytic oxidation of HCl and the incineration of waste liquid with high chlorine content. Corrosion, which restricts the normal operation of the device

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A preparation method for composite coatings used in high-temperature, high-chlorine, and high-scouring environments
  • A preparation method for composite coatings used in high-temperature, high-chlorine, and high-scouring environments
  • A preparation method for composite coatings used in high-temperature, high-chlorine, and high-scouring environments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh zircon powder, titanium dioxide powder and monazite powder respectively according to the mass fraction of 42%, 54% and 4%, and grind the mixed powder fully in a ball mill to obtain a composite powder with uniform composition. The prepared composite powder is dried in an oven at 120° C., and the particle size of the prepared composite powder is 20-50 μm.

[0038]Coarse treatment of the 316L base, including rust removal, oil removal and sandblasting. For sandblasting, first spray coarse sand (12-18 mesh) and then coarse sand (20-22 mesh). Preheat the roughened 316L base, and directly preheat the surface of the base with a supersonic spray gun flame. After the base is preheated, the temperature is controlled at 50-60°C.

[0039] Supersonic flame spraying is used to spray the bottom layer on the base layer, and the bottom layer is made of NiAl alloy powder. The parameters of the supersonic flame spraying technology are: the pressure of fuel gas propane is 0.3MPa, the...

Embodiment 2

[0044] Weigh zircon powder, titanium dioxide powder and monazite powder respectively according to the mass fractions of 55%, 32% and 13%, and grind the mixed powder fully in a ball mill to obtain a composite powder with uniform composition. Dry the prepared composite powder in an oven at 130° C., and the particle size of the prepared composite powder is 20-50 μm.

[0045] Roughen the Inconel600 base, including derusting, degreasing and sandblasting. For sandblasting, first spray coarse sand (12-18 mesh) and then coarse sand (20-22 mesh). Preheat the roughened Inconel600 base, and use supersonic spray gun flame to directly preheat the surface of the base. After the base is preheated, the temperature is controlled at 50-60°C.

[0046] Supersonic flame spraying is used to spray the bottom layer on the base layer, and the bottom layer is made of NiAl alloy powder. The parameters of the supersonic flame spraying technology are: the pressure of fuel gas propane is 0.4MPa, the flow ...

Embodiment 3

[0051] Weigh zircon powder, titanium dioxide and monazite powder respectively according to the mass fraction of 60%, 32% and 8%, and grind the mixed powder fully in a ball mill to obtain a composite powder with uniform composition. Dry the prepared composite powder in an oven at 140° C., and the particle size of the prepared composite powder is 20-50 μm.

[0052] Coarse treatment is carried out on the Q345R base, including rust removal, oil removal and sandblasting. For sandblasting, first spray coarse sand (12-18 mesh) and then coarse sand (20-22 mesh). Preheat the roughened Q345R base layer, and directly preheat the surface of the base layer with a supersonic spray gun flame. After the base is preheated, the temperature is controlled at 50-60°C.

[0053] Supersonic flame spraying is used on the base layer, and the bottom layer is made of NiAl alloy powder. The parameters of supersonic flame spraying technology are: the pressure of fuel gas propane is 0.5MPa, the flow rate o...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for preparing and using a composite coating composed of zircon powder, titanium dioxide and monazite powder in a high-temperature, high-chlorine and high-scouring environment. The method includes: performing coarsening treatment on the base layer from bottom to top , Supersonic flame spraying bottom layer, arc spraying self-healing intermediate coating, supersonic flame spraying composite coating, and sealing treatment. The composite powder coating is prepared by mixing zircon powder, titanium dioxide powder and monazite powder. The obtained composite coating has good corrosion resistance and erosion performance in the environment of high temperature, high chlorine and solid erosion, and is suitable for use in the environment of high temperature, high chlorine and high erosion.

Description

technical field [0001] The invention belongs to the field of corrosion and protection, and in particular relates to a method for preparing a composite coating used in a high-temperature, high-chlorine, and high-scouring environment. [0002] technical background [0003] In chemical production, harsh corrosive environments are often encountered, such as chlorine corrosion, high-temperature oxygen corrosion, and erosion corrosion. The published patents have applied protective methods for one or several aspects of corrosion, but few methods can protect against corrosion. Solve all the above corrosion problems at the same time, especially in the high temperature gas environment with high chlorine content and many solid particles, such as in the HCl catalytic oxidation to prepare chlorine and incinerator gas incineration equipment with high chlorine content. The former is a device for catalytically oxidizing HCl into chlorine gas with a fluidized catalyst under high temperature c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/11C23C4/129C23C4/131C23C4/02C23C4/08
Inventor 李云钊常林王龙山张宏科华卫琦
Owner WANHUA CHEM GRP CO LTD