Novel technology for producing fluorine-free chromium-based composite ceramic material coating

A composite ceramic and new process technology, applied in coatings, electrolytic coatings, etc., can solve the problems of insufficient wear resistance, lubricity and strength, and achieve the effects of good wear resistance, low friction coefficient and improved lubricity.

Inactive Publication Date: 2012-04-18
苏晴 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a new coating process of electrodeposited chromium-based composite ceramic materials in order to solve the shortcomings of insufficient wear resistance, lubricity and strength of the product after traditional electrodeposition of chromium; the products processed by this process have Excellent oil storage, lubricity and excellent wear resistance, corrosion resistance, oxidation resistance and thermal shock resistance, etc., not only can improve the service life and strength of the product itself, but also under high temperature and high load conditions, Due to its excellent lubricating properties, it can also greatly reduce the wear of materials with which the product rubs against each other

Method used

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  • Novel technology for producing fluorine-free chromium-based composite ceramic material coating
  • Novel technology for producing fluorine-free chromium-based composite ceramic material coating
  • Novel technology for producing fluorine-free chromium-based composite ceramic material coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take the production of Φ200 oil cylinder as an example to illustrate the main process of production:

[0013] 1. Prepare 3000L plating solution in chromium-based composite ceramic electrodeposition tank 2, including chromic anhydride 180g / l, sulfuric acid 1.8g / l, FHD additive 3ml / l, trivalent chromium 2g / l, and the rest is pure water; heating plating liquid to 55°C;

[0014] 2. Put the oil tank on the hanger and carry out the necessary pretreatment, then hang it into the tank 2, connect the conductive mechanism, turn on the DC power supply 1, after proper etching and impact, deposit a chromium layer on the inner surface of the oil cylinder for 15 minutes , the current density of this process is 50A / dm 2 ;

[0015] 3. Switch the electrode, switch the workpiece 4 to the anode, the intermediate cathode 5 is turned on, and the insoluble anode 3 is disconnected; at this time, the reticulation of the chromium layer on the surface of the workpiece 4 is deepened and thickened...

Embodiment 2

[0020] Take the production of high-power 165 piston rings as an example to illustrate the main process of production:

[0021] 1. Prepare 2000L plating solution in chromium-based composite ceramic electrodeposition tank 2, including chromic anhydride 250g / l, sulfuric acid 2.5g / l, FHD additive 5ml / l, trivalent chromium 3g / l, and the rest is pure water; heat plating liquid to 60°C;

[0022] 2. After assembling the piston ring into a cylinder, install the hanger and sandblast it, activate it and hang it into the groove 2, connect the conductive mechanism, turn on the DC power supply 1, and deposit a chromium layer on the outer surface of the piston ring cylinder for 30 minutes. The current density of this process is 60A / dm 2 ;

[0023] 3. Switch the electrode, switch the workpiece 4 to the anode, the intermediate cathode 5 is turned on, and the insoluble anode 3 is disconnected. At this time, the reticulation of the chromium layer on the surface of the workpiece 4 is deepened a...

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Abstract

The invention discloses a novel method for producing a fluorine-free chromium-based composite ceramic material coating. The coating comprises components of: 150-350g / l of chromic anhydride, 1.5-3.5g / l of sulfuric acid, 3-8ml / l of an FHD additive, and 2-10g / l of trivalent chromium. The production method comprises steps that: a chromium layer is pre-deposited for 10-40min on the surface of a workpiece; an electrode is switched, such that the mesh of the chromium layer is deepened and thickened; ceramic powder is filled in the mesh slits; the electrode is switched again, chromium is electrically deposited on the surface of the workpiece, such that the mesh is sealed, and the ceramic powder is fixed, until the thickness of the coating satisfies the technological requirements of products. Finally, a chromium-based composite ceramic coating with a ceramic powder content of 1-6Wt%, and properties such as excellent oil retention property, excellent lubricity, excellent wear resistance, excellent corrosion resistance, excellent oxidation resistance, and excellent thermal shock resistance can be obtained. The composite ceramic coating can be widely applied in industries such as automobiles, national defense, aeronautics, astronautics, vehicles, ships, engineering machineries, steel, and the like.

Description

Technical field: [0001] The invention relates to a new coating process of fluorine-free chromium-based composite ceramic materials, which can be widely used in rollers, shafts, piston rings, piston rods, and oil cylinders in industries such as automobiles, national defense, aviation, aerospace, automobiles, ships, engineering machinery, and steel. , cylinders, gears, rocker arms, damping rods and other production fields. technical background: [0002] With the rapid development of industry, modern industrial products are gradually developing in the direction of high strength, high power, and long life, and the requirements for the intrinsic performance of products are getting higher and higher; The traditional way of electro-depositing chromium is processed, even through loose hole chromium deposition, rapid chromium deposition and other methods, it is difficult to meet the requirements of high wear resistance, low wear and overload. Invention content: [0003] The purpos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00C25D5/18C25D5/14
Inventor 苏晴苏效良
Owner 苏晴
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