阅读说明：本技术 一种黄铜钝化液 (Brass passivation solution ) 是由 李忠山 代强 赵雅周 于 2019-10-21 设计创作，主要内容包括：本发明涉及一种黄铜钝化液,所述黄铜钝化液的溶质为硫酸、重铬酸钾和氟化钠,所述黄铜钝化液的溶剂为水；硫酸的质量与水的容积比为5～10：1,单位为克/升；重铬酸钾的质量与水的容积比为90～150：1,单位为克/升；氟化钠的质量与水的容积比为3～5：1,单位为克/升。本发明的黄铜钝化液带温度钝化使成膜速度加快加厚,氟化钠有抗腐蚀抗氧化能力所以膜层抗蚀性也高。且本发明的钝化液操作简单,成本低,钝化膜厚抗蚀性能比普通方法钝化膜高一倍,可推广用于军工、航天、航舶等各种黄铜合金材料零件的钝化。(The invention relates to a brass passivation solution, wherein solutes of the brass passivation solution are sulfuric acid, potassium dichromate and sodium fluoride, and a solvent of the brass passivation solution is water; the volume ratio of the mass of the sulfuric acid to the volume of the water is 5-10: 1, unit is gram/liter; the volume ratio of the mass of the potassium dichromate to the volume of the water is 90-150: 1, unit is gram/liter; the volume ratio of the mass of the sodium fluoride to the volume of the water is 3-5: 1 in grams/liter. The brass passivation solution of the invention has the advantages that the film forming speed is accelerated and thickened due to temperature passivation, and the film has high corrosion resistance due to the corrosion resistance and oxidation resistance of sodium fluoride. The passivation solution of the invention has simple operation and low cost, the thickness and corrosion resistance of the passivation film are twice higher than those of the passivation film prepared by the common method, and the passivation solution can be popularized and used for the passivation of various brass alloy material parts in war industry, spaceflight, shipping and the like.)

1. The brass passivation solution comprises the solutes of sulfuric acid, potassium dichromate and sodium fluoride, and the solvent of the brass passivation solution is water; the volume ratio of the mass of the sulfuric acid to the volume of the water is 5-10: 1, unit is gram/liter; the volume ratio of the mass of the potassium dichromate to the volume of the water is 90-150: 1, unit is gram/liter; the volume ratio of the mass of the sodium fluoride to the volume of the water is 3-5: 1 in grams/liter.

2. The brass passivating solution of claim 1, wherein: the volume ratio of the mass of sulfuric acid to water is 7: 1 in grams/liter.

3. The brass passivating solution of claim 1, wherein: the volume ratio of the mass of the potassium dichromate to the water is 130: 1 in grams/liter.

4. The brass passivating solution of claim 1, wherein: the ratio of the mass of sodium fluoride to the volume of water is 4: 1 in grams/liter.

5. And adding sulfuric acid into water to form dilute sulfuric acid, uniformly stirring, radiating and cooling, adding potassium dichromate into the dilute sulfuric acid, uniformly stirring, radiating and cooling, adding sodium fluoride into the solution, and reacting fully to obtain the brass passivation solution.

6. The method for preparing a brass passivating solution as defined in claim 1, wherein: the concentration range of the dilute sulfuric acid is 0.5-0.9%.

7. The method for preparing a brass passivating solution as defined in claim 1, wherein: the concentration range of the potassium dichromate is 8.2-12.9%.

8. The method for preparing a brass passivating solution as defined in claim 1, wherein: the concentration range of the sodium fluoride is 0.3-0.4%.

Technical Field

The invention belongs to a technical method for solving the problem of a thick passivation film of a brass member, and relates to a technical method for the thick passivation film of the brass member and a tank liquor preparation problem.

Background

At present, general brass parts can be passivated after removing oil and acid washing to remove oxides, the common passivation film has poor corrosion resistance, and the special requirements of products can not be ensured by the passivation of the common brass parts.

Disclosure of Invention

The purpose of the invention is: improve the corrosion resistance of the brass part passivation film thickness reinforcing film, and meet the requirements of the product.

The technical scheme of the invention is as follows:

providing a brass passivation solution, wherein solutes of the brass passivation solution are sulfuric acid, potassium dichromate and sodium fluoride, and a solvent of the brass passivation solution is water; the volume ratio of the mass of the sulfuric acid to the volume of the water is 5-10: 1, unit is gram/liter; the volume ratio of the mass of the potassium dichromate to the volume of the water is 90-150: 1, unit is gram/liter; the volume ratio of the mass of the sodium fluoride to the volume of the water is 3-5: 1 in grams/liter.

Further, the volume ratio of the mass of sulfuric acid to water is 7: 1 in grams/liter.

Further, the volume ratio of the mass of the potassium dichromate to the water is 130: 1 in grams/liter.

Further, the volume ratio of the mass of the sodium fluoride to the water is 4: 1 in grams/liter.

And then adding potassium dichromate into the dilute sulfuric acid, stirring uniformly, radiating and cooling, then adding sodium fluoride into the solution, and reacting fully to obtain the brass passivation solution.

Furthermore, the concentration range of the dilute sulfuric acid is 0.5-0.9%.

Further, the concentration range of the potassium dichromate is 8.2-12.9%.

Furthermore, the concentration range of the sodium fluoride is 0.3-0.4%.

The temperature of the brass passivating liquid is 45-55 ℃ when the brass passivating liquid passivates a workpiece, and the time for passivating the workpiece is 10-15 seconds.

The invention has the advantages that: the brass passivation solution of the invention has the advantages that the film forming speed is accelerated and thickened due to temperature passivation, and the film has high corrosion resistance due to the corrosion resistance and oxidation resistance of sodium fluoride. The passivation solution of the invention has simple operation and low cost, the thickness and corrosion resistance of the passivation film are twice higher than those of the passivation film prepared by the common method, and the passivation solution can be popularized and used for the passivation of various brass alloy material parts in war industry, spaceflight, shipping and the like.

Detailed Description

The present invention is described in further detail below.