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Composite coating with friction-decreasing function and biological-foul and seawater resistances and its production

A composite coating and anti-biological technology, applied in the field of new materials in the field of surface engineering, can solve the problems of low mechanical properties of polymer materials, affecting the dimensional accuracy of workpieces, etc., and achieve simple equipment, low surface energy, and less preparation process Effect

Inactive Publication Date: 2007-11-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its low mechanical properties, polymer materials cannot be used to make large reciprocating parts working in marine environments, and the water swelling of engineering plastics will also affect the dimensional accuracy of the workpiece

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] (2) Preparation of the bonding bottom layer (cathodic protection layer): the supersonic flame spraying process is used to spray ZnNi alloy powder on the surface of the roughened substrate to form a bonding bottom layer with a thickness of 0.08-0.12 mm.

[0031] Spraying process conditions: spraying power 35-40KW, spray distance 130mm.

[0032] The function of this coating is not only to increase the bonding strength between the ceramic composite coating and the base metal, but also to provide cathodic protection for the base metal due to its inherent low potential performance.

[0033] (3) Preparation of composite ceramic coating: Using the atmospheric plasma spraying process, a layer of anti-biofouling and anti-seawater corrosion composite ceramic powder with a particle size of 40-90 μm is sprayed on the ZnNi alloy bonding bottom layer to form a 0.20-0.35 mm thick composite ceramic coating.

[0034] In terms of mass percentage, the composite ceramic powder is composed...

Embodiment 1

[0041] Example 1: Preparation of a composite coating on the working surface of a stainless steel workpiece in seawater.

[0042] Use compressed air to spray hard brown corundum abrasives on the surface of stainless steel workpieces at high speed to make them rough; spray a layer of 0.12mm thick ZnNi alloy bonding bottom layer on the surface of sandblasted stainless steel workpieces, spraying power is 35-40KW, spraying distance 130mm; Spray 90% Cr with a particle size of 40-90μm on the surface of the bonding bottom layer 2 o 3 +10%TiO 2 Ceramic powder, the thickness of the insulating ceramic transition layer is prepared to reach 0.20mm, the power used for spraying is 40-45KW, and the spray distance is 90mm; the surface of the insulating ceramic transition layer is sprayed with group A agglomerated composite ceramic powder with a particle size of 40-90μm, spraying The power used is 40-45KW, the spray distance is 85mm, and the coating thickness reaches 0.20mm; finally, evenly d...

Embodiment 2

[0044] Embodiment 2: Preparation of composite coating on the working face of alloy structural steel workpiece in seawater:

[0045] Use compressed air to spray the hard brown corundum abrasive at high speed on the surface of the alloy structural steel workpiece to make it rough; spray a layer of ZnNi alloy bonding bottom layer with a thickness of 0.08mm on the surface of the sandblasted alloy structural steel workpiece, and the spraying power is 35- 40KW, spray distance 130mm; spray 80% Cr with a particle size of 40-90μm on the surface of the bonding bottom layer 2 o 3 +12%TiO 2 +8%Al 2 o 3 Ceramic powder, the thickness of the insulating ceramic transition layer is prepared to reach 0.15mm, the power used for spraying is 40-45KW, and the spraying distance is 90mm; the group B agglomerated composite ceramic powder with a particle size of 40-90μm is sprayed on the surface of the insulating ceramic transition layer, spraying The power used is 40-45KW, the spray distance is 85...

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Abstract

A composite coating against biological fouling and seawater corrosion and its production are disclosed. The composition consists of oxide based-phase ceramic powder 80-95 wt% and powder against biological fouling 5-20 wt% with Cu, CuO or Cu2O powders. The composite coating comprises binding bottom layer, composite ceramic coating and surface sealing layer; ZnNi alloy powder is sprayed on metal substrate of binding bottom layer by supersonic flame; Composite ceramic power against biological fouling and sea-water corrosion is sprayed on bottom of composite ceramic coating by plasma; Inorganic or organic sealer with low surface energy is sprayed on surface sealing layer. An insulating ceramic transient layer is added between binding bottom layer and composite ceramic coating when Cu powder is adopted. It's simple and cheap and can be used for industrial production.

Description

technical field [0001] The invention relates to the field of new materials in the field of surface engineering, in particular to a composite coating structure design and process preparation method for anti-corrosion, anti-friction and anti-biological fouling in seawater environment. Background technique [0002] With the development of economy and science and technology, the number of reciprocating parts working in the seawater environment has gradually increased. However, the degree of corrosion of seawater, the content of microorganisms, and the lubricating performance of water on the working components all have a certain impact. In general, water is an electrolytic solution with strong electrical conductivity. Most metal materials will undergo electrochemical corrosion in water, and most polymer materials will undergo chemical aging in water, resulting in damage to reciprocating parts. Corrosion, biofouling and mutual seizure damage. Therefore, new topics and tasks are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/08C09D5/16C09D1/00B05D5/08B05D7/14C23C24/00
Inventor 程旭东邓飞飞高忠宝张子军杨章富叶卫平陈明毛昉
Owner WUHAN UNIV OF TECH
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