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Nano chemical plating and preparing method and application thereof

An electroless plating and electroless plating technology, applied in liquid electroless plating, coating, heat exchange equipment and other directions, can solve the problems of reducing the anti-scaling function of heat exchangers, lack of anti-scaling ability of the coating, easy to fall off of the coating, etc. The effect of reducing heat transfer thermal resistance, reducing size, and small excess thermal resistance

Active Publication Date: 2018-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But a preparation method SiO 2 The bonding force with the substrate is weak, and the coating is easy to fall off
At the same time, there is a lack of research on the anti-scaling ability of the coating
[0011] Therefore, the existing electroless coating technology lacks a material that can reduce water condensation on the surface of the heat exchanger and at the same time have the function of anti-scaling

Method used

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  • Nano chemical plating and preparing method and application thereof
  • Nano chemical plating and preparing method and application thereof
  • Nano chemical plating and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Prepare the electroless coating as follows:

[0054] (1) Use a DN25×100 copper tube as the material, polish its surface with 400, 800, and 1200 mesh sandpaper in sequence to remove oxides on the surface of the copper tube, wash it with water, and immerse the copper tube in an alkaline solution for 30 minutes to remove oil , keep the temperature of the lye at about 75°C, wash it with water, and then put the copper tube into 10% H 2 SO 4 Activated in the solution for 30s, washed again with water to obtain the base layer.

[0055] Wherein, the composition of described alkali solution is: NaOH 20g / L, NaOH 2 CO 3 23g / L, Na 3 PO 4 35g / L, OP-105mol / L.

[0056] (2) Prepare each plating solution according to the composition in Table 1

[0057] Table 1

[0058]

[0059] Among them, TiO in bath B 2 It is an anatase structure particle with a particle size of 10-20nm. Weigh the required TiO 2 The total amount was added to the dispersant prepared by n-octyl sodium sul...

Embodiment 2

[0062] (1) Using 30×30×1.5 45# stainless steel plate as material, the operation of surface treatment is the same as step (1) in Example 1.

[0063] (2) Prepare each plating solution according to the composition in Table 2

[0064] Table 2

[0065]

[0066] Among them, TiO in bath B 2 It is an anatase structure particle with a particle size of 10-20nm. Weigh the required TiO 2 The total amount was added to the dispersant prepared by n-octyl sodium sulfate and absolute ethanol for ultrasonic dispersion for 10 minutes to obtain TiO 2 suspension.

[0067] (3) Dip the treated substrate into plating solution A and plating solution B in sequence to perform electroless plating. The plating time is 20 minutes and 45 minutes respectively, and the plating temperature is kept at 75-80°C and the pH is 4.2. After the plating is completed, it is washed with water and dried. Get substrate layer / Ni-P-Cu layer / Ni-P-Cu-TiO 2 Nano-electroless coatings arranged in sequence.

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Abstract

The invention discloses a nano chemical plating and a preparing method and application thereof. The plating comprises a base material layer, a first plating body and a second plating body which are sequentially arranged, the first plating body is a Ni-P-Cu layer, the second plating body is a Ni-P-Cu-TiO2 layer, the concentration of the TiO2 is increased to 3 to 7% from zero in the direction from the base material layer to the surface layer of the second plating body, and is linearly increased, according to the nano chemical plating, all plating bodies are chemically plated on the surface of the pre-treated base material layer in sequence, and the concentration of the TiO2 is linearly increased. The nano chemical plating can be applied to a heat exchanger and can serve as a surface condensation heat exchange plating, the plating contains the TiO2, and the surface of the plating is lyophobic, heat exchange efficiency of a heat exchanger is improved, and due to linear increasing of the TiO2 concentration, combination force between the TiO2 particles and the surface of a base body is increased; internal stress between the plating bodies can be reduced, wear resistance and corrosion resistance of the plating bodies can be improved, and the plating bodies are not prone to falling.

Description

technical field [0001] The invention relates to a nano chemical coating, in particular to a coating which realizes drop-like condensation on a condensation heat exchange surface and has a scale-inhibiting function, and belongs to the technical field of surface engineering. Background technique [0002] Condensation and heat exchange equipment, such as power plant condensers, have widespread problems such as insufficient heat exchange capacity and fouling deposition. [0003] Insufficient heat transfer capacity is limited by the large thermal resistance of film condensation. During film condensation, the liquid film spreads on the heat transfer surface, causing a large thermal resistance. The condensation heat transfer mode corresponding to film condensation is drop condensation. During droplet condensation, the condensate forms droplets on the heat exchange surface, with small thermal resistance and large heat transfer coefficient. The way to achieve dropwise condensation i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/50F28F21/08
CPCC23C18/1651C23C18/50F28F21/089F28F2245/04
Inventor 胡丞高景山张英王红涛郭土
Owner CHINA PETROLEUM & CHEM CORP
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