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Environment-friendly high-efficient brass passivating treatment technology

A passivation treatment, environmental protection technology, applied in the direction of metal material coating process, etc., can solve the problems of certain occupation, complex process, waste water discharge, etc., and achieve the effect of reducing the use cost, process environmental protection, and superior corrosion resistance

Active Publication Date: 2015-01-21
杭州东方表面技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when brass is processed into various parts, the surface is processed by sandblasting, cutting, etc., and the surface may occupy a certain amount of oil during the processing process. The surface treatment process involves degreasing, water washing, pickling, water washing, passivation and other processes. , through degreasing and pickling to ensure that the surface of the brass is clean and fresh, and can be fully contacted with the passivation solution to achieve a good passivation effect; the process involved is complex, and in addition, the process involves water washing, which will generate a large amount of wastewater discharge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of environment-friendly high-efficiency brass passivation treatment process comprises the following steps:

[0030] (1) Degreasing and passivation: soak the brass parts in the passivation solution, passivate at 60°C for 5 minutes;

[0031] (2) Sealing film formation: Soak the passivated brass parts in step (1) in sulfonated castor oil solution (sealing solution), soak at 90°C for 2 minutes, shake dry, and cool;

[0032] In step (1), based on a total volume of 1L, the components of the passivation solution are: 2-mercaptobenzothiazole sodium 2g / l, AES 2g / l, and the balance is water;

[0033] In step (2), based on a total volume of 1 L, the components of the blocking solution are: 20 ml / l of sulfonated castor oil, and the balance is water.

[0034] The anti-discoloration test method adopts the heat and humidity test, and in the actual use of the brass parts, the human body and the air that come into contact with, in addition to water, also have a certain amount of...

Embodiment 2

[0036] Based on the total volume of 1L, the composition of the passivation solution: 2-mercaptobenzothiazole sodium 10g / l, AES 5g / l, and the balance is water;

[0037] Passivation conditions: temperature 40°C, soaking time: 3min;

[0038] Based on the total volume of 1L, the composition of the sealing solution: sulfonated castor oil 100ml / l, the balance is water;

[0039] Sealing conditions: temperature 80°C, soaking time: 1min;

[0040] Operation process: Soak the brass adapter in passivation solution, passivate for 3 minutes, then soak in sulfonated castor oil solution for 1 minute, dry at 80-90°C, and cool.

[0041] With reference to Example 1, the results of the salt spray test show that: the salt spray test time is 240 hours, and the surface of the brass piece is as bright as before without rust, and the test is continued until 268 hours, and gray and black rust spots appear on the surface of the brass piece.

Embodiment 3

[0043] Based on the total volume of 1L, the composition of the passivation solution: 2-mercaptobenzothiazole sodium 15g / l, AES 15g / l, and the balance is water;

[0044] Passivation conditions: temperature 70°C, soaking time: 8min;

[0045] Based on the total volume of 1L, the composition of the sealing solution: sulfonated castor oil 150ml / l, the balance is water;

[0046] Sealing conditions: temperature 70°C, soaking time: 5min;

[0047] Operation process: Soak the brass adapter in passivation solution, passivate for 8 minutes, then soak in sulfonated castor oil solution for 5 minutes, dry at 60-70°C, and cool.

[0048] Referring to Example 1, the results of the salt spray test show that: the salt spray test time was 168 hours, and the surface of the brass piece was as bright as ever without rust. The test continued until 210 hours, and gray-black rust appeared on the surface of the brass piece.

[0049] Comparative Test

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PUM

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Abstract

The invention relates to an environment-friendly high-efficient brass passivating treatment technology. The passivating treatment technology comprises the following steps: (1), deoiling and passivating: soaking a brass piece in a passivating solution for passivating for 1-20 min; (2), sealing and film forming: soaking the brass piece passivated in the step (1) in a sulfonated castor oil solution for 0.1-20 min, spin-drying and cooling, wherein the passivating solution comprises mercaptobenzothiazole salt and sodium alcohol ether sulphate, the dosage of mercaptobenzothiazole salt is 0.02-50 g / l, the dosage of sodium alcohol ether sulphate is 0.5-20 g / l, and the dosage of sulfonated castor oil is 0.5-500 ml / l. The passivating treatment technology does not relate to heavy metals of chromic acid and the like, and is free of the procedures of separate deoiling, acid washing, washing and the like, environment-friendly and safe; meanwhile, the anti-neutral salt spray test can be realized for 168 hours or above, and corrosive resistance of the passivating treatment technology is remarkably superior to that of the conventional various passivating treatment technologies.

Description

technical field [0001] The invention belongs to the field of metal surface chemical anticorrosion treatment, and in particular relates to an environment-friendly high-efficiency brass passivation treatment process. Background technique [0002] Brass has good wear resistance and plasticity, and is widely used in industrial production. Brass has a beautiful metallic luster, but its oxidation resistance is poor, and it is easy to tarnish and corrode. In order to prevent discoloration and rust, people used to passivate the surface of brass with chromic acid or use electroplating. However, the use of chromic acid passivation treatment will use highly toxic chromic acid, which is not environmentally friendly; while the use of electroplating treatment is relatively expensive. [0003] In order to overcome the above problems, in the prior art, people use passivation solution mainly based on benzotriazole and its derivatives to replace chromic acid passivation and anti-tarnish tre...

Claims

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Application Information

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IPC IPC(8): C23C22/73C23C22/02
CPCC23C22/02C23C22/73
Inventor 郭伟荣曾鑫张光前
Owner 杭州东方表面技术有限公司
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