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Method for strengthening composite coating by using nano silicon dioxide sol and rare-earth

A nano-silica and composite coating technology, applied in liquid chemical plating, coating, metal material coating technology and other directions, can solve the problems of easy agglomeration and poor effect of nanoparticles, and achieve uniform particle distribution, low cost, The effect of increasing the hardness value

Active Publication Date: 2009-04-01
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the preparation methods of composite coatings at home and abroad all use nanoparticles directly added to the plating solution for plating. The disadvantage is that the nanoparticles are easy to agglomerate, and mechanical stirring must be carried out continuously, and the effect is poor.

Method used

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  • Method for strengthening composite coating by using nano silicon dioxide sol and rare-earth
  • Method for strengthening composite coating by using nano silicon dioxide sol and rare-earth

Examples

Experimental program
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Embodiment 1

[0024] 1. Preparation of chemical composite plating solution,

[0025] The content of each component in each liter of plating solution is: nickel sulfate 30g / L, sodium hypophosphite 35g / L, citric acid 25g / L, sodium acetate 20g / L, potassium iodide 60mg / L, sodium dodecylbenzenesulfonate 3mg / L, cerium sulfate 2mg / L, SiO 2 Sol 10ml / L, add deionized water to prepare the plating solution, adjust the pH value of the plating solution to 4.5 with sodium hydroxide;

[0026] 2. Heat the above bath to 75°C;

[0027] 3. Put the carbon steel sample into the alkaline degreasing bath (Na 2 CO 3 =35g / L, Na 3 PO 4 12H 2 (O=15g / L, NaOH=7.5g / L) for chemical degreasing, temperature 70°C, take it out after 10 minutes, remove and rinse with deionized water;

[0028] 4. Put the degreased sample into 5% dilute sulfuric acid solution for pickling for 1 min, then rinse with deionized water;

[0029] 5. Put the sample after pickling into the plating solution to ensure that the temperature of the ...

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Abstract

The invention relates to a method which adopts nano silicon dioxide sol and rare earth to strengthen a composite deposite. The method comprises the following main steps: the preparation of a nano sol, the preparation of a plating solution and electroless composite plating, and is characterized in that: the nano SiO2 sol is directly added into the Ni-P chemical plating solution containing rare earth cerous sulfate to carry out plating, obtained nano SiO2 particles in the composite deposite are evenly distributed and the rigidity of the deposite is obviously improved. The method also has the advantages of convenient operation without mechanical stirring during the plating process, low cost, and the like.

Description

technical field [0001] The invention relates to a method for strengthening composite coating by adopting nano-silica sol and rare earth. Specifically, the present invention improves the overall performance of the coating by adding nano silicon dioxide particles to the nickel-phosphorus electroless coating. technical background [0002] In recent years, coatings and coatings with many specific functions have been widely used in engineering technology, and have played an irreplaceable role in surface modification and strengthening of materials. There are many ways to prepare coatings and coatings, among which composite coatings based on chemical or electrochemical deposition are widely used in engineering technology. Composite coating refers to adding one or several kinds of insoluble solid particles to the plating solution, so that the solid particles and metal ions are co-deposited to obtain coatings with various physical and chemical properties. The size of the solid part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36
Inventor 侯峰徐宏张莉刘京雷周建新
Owner EAST CHINA UNIV OF SCI & TECH
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