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A kind of corrosion-resistant high-temperature resistant ceramic-organic composite coating and its preparation method and application as metal corrosion-resistant coating

A technology of high-temperature resistant ceramics and composite coatings, applied in coatings, surface reaction electrolytic coatings, devices for coating liquids on surfaces, etc., can solve problems such as poor corrosion resistance and achieve long-term resistance to neutral salt solutions Corrosion, good compatibility, improve the effect of barrier effect

Active Publication Date: 2020-08-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of poor corrosion resistance on the surface of drilling pipes used for shale oil and gas development in the prior art, the first purpose of the present invention is to provide a pipe with excellent resistance to strong acid corrosion, long-term neutral salt solution corrosion resistance and 160°C corrosion resistance. ~200℃ high temperature ceramic-organic composite coating, especially suitable for surface modification of drilling pipes for shale oil and gas development

Method used

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  • A kind of corrosion-resistant high-temperature resistant ceramic-organic composite coating and its preparation method and application as metal corrosion-resistant coating
  • A kind of corrosion-resistant high-temperature resistant ceramic-organic composite coating and its preparation method and application as metal corrosion-resistant coating
  • A kind of corrosion-resistant high-temperature resistant ceramic-organic composite coating and its preparation method and application as metal corrosion-resistant coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The sample is 7 series aluminum alloy, and the sample size is 50*50*3mm.

[0050] The first step is alloy pretreatment. Use 180-1200# water sandpaper to grind from coarse to fine, wash with water, then ultrasonically clean in acetone solution for 10min, and wash with deionized water.

[0051] The second step is micro-arc oxidation treatment. The micro-arc oxidation power supply adopts AC power supply, constant current mode, power frequency is 750Hz, pulse width is 307μs, duty cycle is 17%, and the electrolyte is composed of sodium silicate, sodium tungstate, sodium phosphate and Sodium hydroxide composition. Using a stirring and cooling device, control the solution temperature at 15°C±1°C, and the oxidation time is 25min.

[0052] The third step is to seal the holes. The sealing treatment steps are: ① Configure silane solution, add 20ml tetraethoxysilane to 40ml ethanol, place on a magnetic stirrer and stir evenly, add 10ml silane coupling agent KH570, after stirring...

Embodiment 2

[0059] The sample is 2-series aluminum alloy, and the sample size is 50*50*3mm.

[0060] The difference from Example 1 is that the second step is micro-arc oxidation treatment. The micro-arc oxidation power supply adopts DC power supply, and the control current density is 8A / dm 2 , the electrolyte consists of sodium silicate, glycerin and sodium hydroxide. Using a stirring and cooling device, control the temperature of the solution at 30°C ± 5°C, and conduct micro-arc oxidation for 15 minutes. The fourth step is to prepare a silane-modified epoxy resin organic coating. The preparation steps are as follows: ① Dissolve bisphenol A diglycidyl ether and polyamide in a solvent at a mass ratio of 10:7 to form an epoxy solution. The solvent used is xylene and n-butanol mixed in a volume ratio of 2:1, and the mass ratio of solvent to bisphenol A diglycidyl ether is 2:1. Then mix the silane solution aged for 48 hours in the third step into the epoxy solution, and the mass ratio of ...

Embodiment 3

[0065] The sample is cast aluminum alloy, and the sample size is 50*50*3mm.

[0066] The difference from Example 1 is that the fourth step is to prepare a silane-modified epoxy resin organic coating. The preparation steps are: ① dissolving bisphenol A diglycidyl ether and polyamide in a solvent at a mass ratio of 5:1 to form an epoxy solution. The solvent used is xylene and n-butanol mixed in a volume ratio of 2:1, and the mass ratio of solvent to bisphenol A diglycidyl ether is 1:1. Then mix the silane solution aged for 48 hours in the third step into the epoxy solution, and the mass ratio of the silane solution to the epoxy resin is 3:1. Stirring was continued for 5 hours to form a silane-modified epoxy resin organic polymer solution. ② The alloy after silane sealing treatment is dip-coated in silane-modified epoxy resin organic polymer solution for 10 seconds, taken out, dried naturally at room temperature for 12 hours, and then put into a constant temperature drying oven...

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Abstract

The invention discloses a corrosion-resisting and high-temperature-resisting ceramic-organic composite coating, a preparing method of the corrosion-resisting and high-temperature-resisting ceramic-organic composite coating and application of the corrosion-resisting and high-temperature-resisting ceramic-organic composite coating serving as a metal corrosion-resisting coating. The ceramic-organic composite coating is composed of a bottom-layer ceramic coating, a middle silane coating and an upper-layer silane modified epoxy resin coating. The preparing method of the corrosion-resisting and high-temperature-resisting ceramic-organic composite coating includes the steps that micro-arc oxidation treatment and a dipping-curing technology are sequentially adopted on the surface of a base body, wherein the ceramic coating is generated through the micro-arc oxidation treatment, and the silane coating and the silane modified epoxy resin coating are generated through the dipping-curing technology. The composite coating has very good strong acid corrosion resisting performance and long-term neutral salt solution corrosion resisting performance, has good heat stability under the temperature ranging from 160 DEG C to 200 DEG C and is particularly suitable for surface treatment for metal or metal alloys used in a strong acid corrosion or long-term neutral salt solution corrosion environment.

Description

technical field [0001] The invention relates to an anticorrosion technology for metal and alloy surfaces, in particular to a ceramic-organic composite coating resistant to strong acid corrosion, more specifically, to a surface preparation of a drilling pipe for shale oil and gas development with strong acid resistance A ceramic-organic composite coating resistant to corrosion and long-term neutral salt solution corrosion to meet the requirements of metals and alloys in harsh environments belongs to the technical field of metal surface treatment. Background technique [0002] In recent years, the demand for oil and gas energy has been increasing, and unconventional oil and gas business has become the development trend of oil and gas development. It is mainly manifested in the exploration and development of shale oil and gas. [0003] In the process of conventional oil and gas development, most drilling uses mud, which has the functions of carrying and suspending cuttings, st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D7/00B05D7/14B05D5/00C25D11/02
CPCB05D5/00B05D7/14B05D7/546B05D2504/00B05D2518/10C25D11/026B05D2420/01B05D2420/02
Inventor 刘志义曾娣平柏松赵娟刚刘冠华
Owner CENT SOUTH UNIV
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