Method for preparing silver-white chemical conversion film on brass surface

A chemical conversion film, silver-white technology, applied in the direction of metal material coating process, can solve the problems of easy discoloration, weak corrosion resistance, poor film adhesion, etc., to achieve good adhesion, low cost, acid corrosion resistance strong effect

Inactive Publication Date: 2018-08-03
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the prepared film layer still has problems such as poor bonding force, easy to change color, and weak corrosion resistance.

Method used

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  • Method for preparing silver-white chemical conversion film on brass surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Weigh 0.5000g of benzotriazole and add 20mL of ethanol to dissolve, then add 20.0000g of tartaric acid to dissolve in water, then add 5.0000g of antimony trioxide, then add 200mL of hydrochloric acid to completely dissolve the precipitate, add water to make up to 1000mL;

[0039] 2) Weigh 50g of sodium hydroxide, 20g of sodium carbonate, 50g of sodium phosphate, and 8g of sodium silicate and dissolve them in water in turn, add water to make up to 1000mL;

[0040] 3) Measure 700mL of hydrogen peroxide, then add 150g of ethylene glycol, 40g of concentrated sulfuric acid, 2mL of OP-10, add water to 1000mL;

[0041] 4) Slowly add 10mL of concentrated sulfuric acid into water, cool to room temperature, add water to make up to 1000mL;

[0042] 5) Brass surface pretreatment: for the substrate at 70 0 Degreasing under C conditions, the duration is 5 minutes; polishing is performed at room temperature, the duration is 30s; activation treatment is performed at room temperatur...

Embodiment 2

[0052] 1) Weigh 0.8000g of benzotriazole and add 25mL of ethanol to dissolve, then add 26.0000g of tartaric acid to dissolve in water, then add 7.0000g of antimony trioxide, then add 240mL of hydrochloric acid to completely dissolve the precipitate, add water to make up to 1000mL;

[0053] 2) Weigh 40g of sodium hydroxide, 15g of sodium carbonate, 40g of sodium phosphate, and 5g of sodium silicate and dissolve them in water in turn, add water to make up to 1000mL;

[0054] 3) Measure 600mL of hydrogen peroxide, then add 120g of ethylene glycol, 30g of concentrated sulfuric acid, 1mL of OP-10, add water to 1000mL;

[0055] 4) Slowly add 10mL of concentrated sulfuric acid into water, cool to room temperature, add water to make up to 1000mL;

[0056] 5) Brass surface pretreatment: for the substrate at 60 0 Degreasing under C conditions for 3 minutes; polishing at room temperature for 30 s; activation at room temperature for 10 s; a water washing process interspersed between each...

Embodiment 3

[0066] 1) Weigh 1.0000g of benzotriazole and add 30mL of ethanol to dissolve, then add 30.0000g of tartaric acid to dissolve in water, then add 10.0000g of antimony trioxide, then add 300mL of hydrochloric acid to completely dissolve the precipitate, add water to make up to 1000mL;

[0067] 2) Weigh 43g of sodium hydroxide, 17g of sodium carbonate, 45g of sodium phosphate, and 7g of sodium silicate, dissolve them in water in turn, add water to make up to 1000mL;

[0068] 3) Measure 660mL of hydrogen peroxide, then add 135g of ethylene glycol, 35g of concentrated sulfuric acid, 3mL of OP-10, add water to 1000mL;

[0069] 4) Slowly add 10mL of concentrated sulfuric acid into water, cool to room temperature, add water to make up to 1000mL;

[0070] 5) Brass surface pre-treatment: for the substrate at 65 0 Degreasing under C conditions for 4 minutes; polishing at room temperature for 30 s; activation at room temperature for 15 s; a water washing process interspersed between each ...

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Abstract

The invention discloses a method for preparing a silvery white chemical conversion coating on a brass surface. The method is characterized in that the brass surface reacts with a conversion solution to generate colored ions deposited on the surface, thereby forming the silvery white chemical conversion coating. The method comprises the following steps: carrying out deoiling, polishing, activation and cleaning on the brass matrix, putting into an antimony-salt-containing acidic solution, reacting with the solution until a uniform-stable-color silvery white coating is generated on the brass surface, and carrying out related subsequent treatment to prevent the coating surface from being contaminated. The method has the advantages of simple technical process and low cost. The prepared coating has the advantages of high acid corrosion resistance and favorable binding force, and can simultaneously perform the functions of decoration and corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and relates to a method for preparing a corrosion-resistant brass surface and a functional protective layer. Background technique [0002] Copper-zinc alloy, also known as brass, has a wide range of strength and plasticity, good mechanical properties and casting properties, and is widely used in material processing, workpiece manufacturing, and handicraft production. However, ordinary binary brass is easy to oxidize and change color, and its corrosion resistance is poor in high-temperature and high-humidity environments. In addition, in the field of decoration, due to the upgrading of products and the needs of exports in recent years, the single color of brass is far from being sufficient for production. Require. Therefore, surface treatment is often carried out during use, and it plays the role of decoration and anticorrosion at the same time. [0003] The preparation of chemical con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/73C23C22/52
CPCC23C22/52C23C22/73
Inventor 高景龙刘聘邵忠才
Owner SHENYANG LIGONG UNIV
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