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Preparation method of nickel base alloy coating on boiler water wall

A nickel-based alloy, water-cooled wall technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the problems of harsh conditions, low coating bonding strength, long production cycle, etc., and achieve excellent corrosion resistance. effect on wear resistance

Inactive Publication Date: 2015-01-07
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings are: long production cycle, harsh conditions in the production process, low coating bonding strength, easy to fall off, short service life, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] A preparation method for a nickel-based alloy coating on a water wall of a boiler comprises the following steps:

[0015] (1) Carry out surface pretreatment on the surface of the boiler water wall tube panel. The pretreatment process is as follows: firstly, use No. 16-20 quartz sand for rough spraying for 2 times to remove the rust, scale and coking on the surface of the water wall tube surface, and reveal off-white Metallic luster, so that the surface cleanliness can reach Sa3.0 level, and then use No. 14-16 brown corundum for surface roughening treatment, the surface roughness can reach Rz80-120μm, and the surface of the water wall tube presents a homogeneous off-white metal appearance;

[0016] (2) Spray the combined bottom layer on the pretreated surface; the combined bottom layer is Al alloy or NiAl alloy or a combination of two alloys, and the combined bottom layer is sprayed with a thickness of 0.15-0.2mm. Metallurgical bonding occurs with the surface of the subst...

Embodiment 1

[0026] According to the method of the present invention, first form the bonding bottom layer on the pretreated surface of the boiler water wall tube panel roughened by cold spraying, and then spray a layer of high-temperature corrosion-resistant and wear-resistant nickel-based alloy working coating on it to form Double-layer composite structural coating. Combining with the bottom layer, propane is used as gas, the pressure is 0.65MPa, compressed air is used as atomizing gas and supporting gas, the pressure is 0.70MPa, the spraying current is 130A, the spraying voltage is 30V, and the spraying distance is 150mm when spraying the coating; similarly, supersonic arc The spraying working coating uses propane as the fuel gas, the pressure is 0.54MPa, the compressed air is used as the atomizing gas and supporting gas, the pressure is 0.58MPa, the spraying current is 105A, the spraying voltage is 19V, and the spraying distance is 150mm when spraying the coating. Spraying process param...

Embodiment 2

[0028]According to the method of the present invention, a supersonic arc spraying method is used to prepare a double-layer composite structural coating on the pretreated boiler water wall tube panel, and the coating is divided into 5 layers for spraying: 1-2 layers of spraying combined with the bottom layer, and the spraying thickness of each layer 0.075 ~ 0.1mm, 3 ~ 5 layers of spray coating, the spray thickness of each layer is 0.1 ~ 0.15mm, and form a layer, two layers, and three layers at the end of the upper part of the boiler water wall tube screen every 10 ~ 15mm Transition zone. Strictly controlling the number and thickness of sprayed layers is the key to the quality assurance of the coating. If the coating is too thick, it is easy to peel off and bulge, and the bonding strength of the coating will drop significantly. The designed and prepared coating has high bonding strength, and there is no local raised defect at the end, which avoids the generation of new wear poin...

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Abstract

A preparation method of a nickel base alloy coating on a boiler water wall is characterized in that a compound coating is formed on the surface of a tube panel of the boiler water wall and adopts a double-layer compound structure coating which is formed by coating a bonding base layer on the tube panel of the boiler water wall by supersonic-speed electric arc spraying equipment and coating a nickel base alloy coating resistant to the high-temperature corrosion and abrasion on the combined base layer. According to the preparation method of the nickel base alloy coating on the boiler water wall, the service life of the boiler water wall can be greatly prolonged, the process is simple, the production cost is low, the controllability is good, the influence on a substrate is small, the bonding strength of the coating is high, the service life of the boiler water wall can be effectively prolonged, and the boiler water wall has excellent corrosion and abrasion resistance.

Description

technical field [0001] The invention relates to a coating preparation method in the fields of electric power, environment and material processing, in particular to a method for preparing a nickel-based coating on a boiler water wall by adopting a supersonic arc spraying method. Background technique [0002] Circulating fluidized bed boilers are widely used in industry, power generation and other industries. It has the advantages of good fuel adaptability, high combustion efficiency, and large load adjustment range. However, there is also a problem in circulating fluidized bed boilers. Due to the high velocity and high particle concentration in the bed, the corrosion and wear of the tubes on the heating surface are quite serious, resulting in leakage of the tube wall, resulting in tube explosion. Domestically produced 220t / h circulating fluidized bed boilers generally have a design and production life of more than 20 years, and some as long as 40 years. However, due to corro...

Claims

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Application Information

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IPC IPC(8): C23C4/12C23C4/06C23C4/131
CPCC23C4/08
Inventor 蒋华义王洪铎
Owner XI'AN PETROLEUM UNIVERSITY
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