Rare earth modified surface treating agent for copper and copper alloys and preparation method thereof

A surface treatment agent, rare earth modification technology, applied in the direction of metal material coating process, etc., can solve the problems of long processing time, environmental hazards, complex processing technology, etc., to reduce passivation time, good corrosion resistance, and processing technology. simple effect

Active Publication Date: 2011-05-25
斯特凯新材料(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to replace the hexavalent chromium passivation technology, the industry is actively researching the chromium-free passivation technology of copper and its alloys, among which Cr 3+ Low-priced chromium passivation as the main film-forming substance, but Cr 3+ There is also a certain degree of harm to the environment, and under certain conditions, it may also be converted into more harmful Cr 6+ , so it cannot be Cr 6+ The best alternative to passivation; the existing completely chromium-free treatment process for copper and its alloys generally uses benzotriazole (BTA) alone or uses it in combination with several other components, Its treatment process is relatively complicated, often requires heating, and the treatment time is also long. The test results show that its corrosion resistance effect is far from ideal compared with the traditional chromate treatment, and cannot meet the needs of actual production.

Method used

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  • Rare earth modified surface treating agent for copper and copper alloys and preparation method thereof
  • Rare earth modified surface treating agent for copper and copper alloys and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Take 3g BTA by weighing, add in 200ml water, stir fully and make the semi-finished product treatment liquid after it dissolves for subsequent use;

[0032] (2) take by weighing 1g sodium molybdate respectively, 0.2g sodium silicate, 0.4g lanthanum nitrate and 0.2g cerium nitrate, add respectively in 200ml water, after it dissolves, mix with the semi-finished product treatment liquid that step (1) makes, Fully stir until it is completely dissolved to prepare a semi-finished product treatment solution for use;

[0033] (3) gradually add 15g citric acid, 6g sulfosalicylic acid, 0.4g sodium lauryl sulfate in the semi-finished product treatment liquid that makes in step (2), stir evenly during adding, the component that is to be added earlier After dissolving, continue to add the next component;

[0034] (4) adding an appropriate amount of water to the volume of the treatment agent in the semi-finished treatment liquid prepared in step (3) is 1L, and the pH value is adj...

Embodiment 2

[0036] (1) Take 1g of BTA by weighing, add in 200ml of water, fully stir until it dissolves to prepare a semi-finished product treatment liquid for subsequent use;

[0037] (2) Take by weighing 3g sodium molybdate, 0.1g sodium silicate, and 0.6g lanthanum nitrate, add respectively in 200ml water, after it dissolves, mix with the semi-finished product treatment solution that step (1) makes, fully stir until it is completely After dissolving, the semi-finished product treatment liquid is prepared for use;

[0038] (3) gradually add 10g of citric acid, 8g of sulfosalicylic acid, and 0.2g of sodium lauryl sulfate to the semi-finished product treatment solution prepared in step (2), and stir evenly during the addition process. After dissolving, continue to add the next component;

[0039] (4) adding an appropriate amount of water to the volume of the treatment agent in the semi-finished treatment liquid prepared in step (3) is 1L, and the pH value is adjusted to 3.5-5 with 98% sul...

Embodiment 3

[0041] (1) Take 2g of BTA by weighing, add in 200ml of water, fully stir until it dissolves to prepare a semi-finished product treatment liquid for subsequent use;

[0042] (2) Take by weighing 4g sodium molybdate, 0.3g sodium silicate, 0.3g lanthanum nitrate respectively, add respectively in 200ml water, after it dissolves, mix with the semi-finished product treatment solution that step (1) makes, fully stir until it is completely After dissolving, the semi-finished product treatment liquid is prepared for use;

[0043] (3) Gradually add 18g citric acid, 10g sulfosalicylic acid, and 0.6g sodium lauryl sulfate to the semi-finished product treatment solution prepared in step (2), stir evenly during the addition process, and the components to be added earlier After dissolving, continue to add the next component;

[0044] (4) adding an appropriate amount of water to the volume of the treatment agent in the semi-finished treatment liquid prepared in step (3) is 1L, and the pH value...

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Abstract

The invention discloses a rare earth modified surface treating agent for copper and copper alloys and a preparation method thereof. The surface treating agent per liter comprises the following raw materials by weight: 1-3g of benzotriazole, 1-5g of sodium molybdate, 0.1-0.3g of sodium silicate, 0.3-0.6g of rare earth salt, 10-20g of complexing agent, 6-10g of sulfosalicylic acid, 0.2-0.6g of surfactant, a small amount of pH regulator and the balance water. The surface treating agent of the invention can be used for passivation at the room temperature, have short passivation time and be green and environmentally friendly; the passivated copper or copper alloy surface has good corrosion resistance; and the treating agent has simple treatment technology and is convenient for actual production.

Description

technical field [0001] The invention relates to a surface treatment agent for copper and its alloys, in particular to a rare earth modified surface treatment agent for copper and its alloys and a preparation method. Background technique [0002] Copper is one of the earliest metal materials contacted and used by human beings. Copper exists in elemental form in nature. As early as the Qijia culture in the upper reaches of the Yellow River in my country in the 17th century BC, people mastered the technology of cold forging and casting red copper. Today, as an engineering material, copper and copper alloys have excellent electrical conductivity, thermal conductivity, processability and good corrosion resistance, as well as sufficient mechanical strength, elasticity, wear resistance, etc., so they are used in electricity, electrical appliances, construction, It has a wide range of applications in shipbuilding, petrochemical, energy, national defense and other industrial fields....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/40
CPCC23C22/40
Inventor 饶丹刘万青
Owner 斯特凯新材料(上海)有限公司
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