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Anti-corrosion method of nickel-based alloy heating tube

A technology of nickel-based alloy and heating tube, which is applied in the coating process of metal materials, devices for coating liquid on the surface, coating, etc., can solve the problems of high cost, high price, high sintering temperature, etc., and achieve the trend of reducing corrosion , the effect of no pores

Inactive Publication Date: 2011-10-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The Chinese invention patent with the application number 200810020318 discloses a preparation process of a porous stainless steel-ceramic composite membrane. Although this manufacturing process can improve the anti-corrosion performance of stainless steel plates, the sintering temperature is as high as 1400 ° C. Surfactants within this temperature range The formed silica gel bundles with uniform diameter are destroyed, seriously affecting the film-forming effect
The application number is 200810222623. The electric brush plating target process is used to form a protective layer on the surface of the stainless steel substrate. The plating solution used in this process has a complex ratio and is expensive. It is widely used in water heater heating pipes and the cost is relatively high.
The application number is 200910102234. The PVD vacuum coating method is used to prepare a protective film on the stainless steel surface. The corrosion resistance of the stainless steel plate is improved through this manufacturing process, but the process is complicated, the preparation conditions are harsh, and the cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Treatment of nickel-based alloy heating tube substrate

[0020] In the experiment, the Incoloy800 nickel-based alloy heating tube was used as the raw material, and a sample of (15*15) mm was cut. Use sandpaper that complies with GB2481.1 to grind to 800# in sequence, rinse with deionized water, degrease with alcohol, and dry for use.

[0021] (2) Preparation of silica sol

[0022] The experiment used tetraethyl silicate (TEOS) as the precursor, polyethylene glycol 200 (PEG-200), polyethylene glycol 20000 (PEG-20000) as the surfactant, PEG200: PEG20000: TEOS: HCl: H 2 O was mixed uniformly at a molar ratio of 0.00587:0.00293:0.1:13:100, sealed and reacted at 80°C for 3 hours, and aged for 3 days for later use.

[0023] (3) Preparation of silica film

[0024] Immerse the treated substrate sample into the prepared solution, pull it at a constant speed of 10cm / min after 10min, and perform multi-layer coating according to the actual situation.

[0025] (4) Calcinatio...

Embodiment 2

[0029] A method for preparing a silicon dioxide corrosion-resistant film on the surface of a nickel-based alloy heating tube comprises the steps:

[0030] (1) Treatment of nickel-based alloy heating tube substrate

[0031] In the experiment, the Incoloy800 nickel-based alloy heating tube was used as the raw material, and a sample of (15*15) mm was cut. Use sandpaper that complies with GB2481.1 to grind to 800# in sequence, rinse with deionized water, degrease with alcohol, and dry for use.

[0032] (2) Preparation of silica sol

[0033] The experiment used tetraethyl silicate (TEOS) as the precursor, polyethylene glycol 200 (PEG-200), polyethylene glycol 20000 (PEG-20000) as the surfactant, PEG200: PEG20000: TEOS: HCl: H 2 O was mixed uniformly at a molar ratio of 0.00293:0.00587:0.1:13:100, sealed and reacted at 80°C for 3 hours, and aged for 3 days for later use.

[0034] (3) Preparation of silica film

[0035] Immerse the treated substrate sample into the prepared solut...

Embodiment 3

[0040] A method for preparing a silicon dioxide corrosion-resistant film on the surface of a nickel-based alloy heating tube comprises the steps:

[0041] (1) Treatment of nickel-based alloy heating tube substrate

[0042] In the experiment, the Incoloy800 nickel-based alloy heating tube was used as the raw material, and a sample of (15*15) mm was cut. Use sandpaper that complies with GB2481.1 to grind to 800# in sequence, rinse with deionized water, degrease with alcohol, and dry for use.

[0043] (2) Preparation of silica sol

[0044] The experiment used tetraethyl silicate (TEOS) as the precursor, polyethylene glycol 200 (PEG-200), polyethylene glycol 20000 (PEG-20000) as the surfactant, PEG200: PEG20000: TEOS: HCl: H 2 O was mixed uniformly at a molar ratio of 0.0066:0.0022:0.1:13:100, sealed and reacted at 80°C for 3h, and aged for 3d for later use.

[0045] (3) Preparation of silica film

[0046] Immerse the treated substrate sample into the prepared solution, pull i...

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Abstract

The invention discloses an anti-corrosion method of a nickel-based alloy heating tube, belonging to the anti-corrosion technical field. The method comprises the following steps of: polishing the nickel-based alloy heating tube matrix to No.800 by using abrasive paper, cleaning by using de-ionized water and alcohol in sequence and drying; uniformly mixing PEG200 (Polyethylene Glycol 200), PEG20000, TEOS (Tetraethyl Orthosilic), HCl and H2O in a mole ratio of (0.00293-0.0066):(0.0022-0.00587):0.1:13:100; reacting in a sealed way at 80 degrees centigrade for 3 h; aging for 3 d for later use; immersing the processed matrix in the prepared solution; lifting at constant speed of 10 cm / min; putting a sample in a muffle furnace; increasing temperature to 540 degrees centigrade at a speed of 2 degrees centigrade per minute; keeping temperature for 10 h; and naturally cooling to obtain a silicon dioxide film. The method disclosed by the invention has a simple process and good controllability. The prepared silicon dioxide film is compact and uniform and does not contain pores and bubbles.

Description

technical field [0001] The invention relates to a method for preventing corrosion of a nickel-based alloy heating tube, in particular to a method for preparing a silicon dioxide corrosion-resistant film on the surface of a nickel-based alloy heating tube. The prepared silicon dioxide film is uniform and dense, and can be applied to The invention relates to the field of anti-corrosion on the surface of heating pipes of electric water heaters, belonging to the technical field of anti-corrosion. technical background [0002] At present, the shell of the electric water heater heating tube is mainly made of two nickel-based alloys, Incoloy800 and Incoloy840. Incoloy800 and Incoloy840 are austenitic stainless steels, which have good high temperature resistance and corrosion resistance; In a temperature-changing environment, and there are chloride ions in the environment, corrosion and perforation of the heating tube often occur. At present, water heater manufacturers mainly use t...

Claims

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Application Information

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IPC IPC(8): C23C20/08B05D1/18
Inventor 魏刚白阿香乔宁
Owner BEIJING UNIV OF CHEM TECH
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