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Metal anti-color changing method using self-assembling monomolecular film

A self-assembled single-molecule, anti-discoloration technology, which is applied in the coating process of metal materials, etc., can solve the problems of high toxicity, threats to the health of operators and the environment, improve anti-discoloration ability, and avoid the use of toxic chemicals , the effect of simple operation

Inactive Publication Date: 2009-03-18
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these substances have a common weakness - high toxicity, which poses a threat to the health of operators and the environment

Method used

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  • Metal anti-color changing method using self-assembling monomolecular film
  • Metal anti-color changing method using self-assembling monomolecular film
  • Metal anti-color changing method using self-assembling monomolecular film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0027] Get copper sheet (10 * 10 * 1mm) copper-containing 99.9%, adopt following steps to process:

[0028] (1) Degreasing:

[0029] After degreasing with alkali (sodium hydroxide) solution, rinse with deionized water;

[0030] (2) Polishing:

[0031] Use sandpaper to polish the degreased and cleaned copper sheet to 2000#;

[0032] (3) Activation:

[0033] Nitric acid: 7mol / L,

[0034] Time: 30s,

[0035] Temperature: room temperature;

[0036] (4) Surface treatment:

[0037] Active substance: 3-Undecyl-4-amino-5-mercapto-1,2,4-s-triazole,

[0038] Solvent: ethanol,

[0039] Concentration: 10 -3 mol / L,

[0040] Time: 24h,

[0041] Temperature: room temperature;

[0042] (5) Cleaning:

[0043] After ultrasonically oscillating in ethanol for 10 min, rinse off residual ethanol with deionized water;

[0044] (6) Drying: For metals with residual solution on the surface, dry them with hot air after washing with water.

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Abstract

The invention relates to a process for metal surface treatment, in particular to a metal discoloration resisting method by using a self-assembled monomolecular film. The method aims to the corrosion and discoloration problems of metal like copper, copper alloy, sliver and sliver alloy, gold and gold alloy and so on or other metal or non-metal surface coatings consisting of the metals during the course of storage in the atmosphere, and adopts active environment-friendly material triazole derivatives to form the self-assembled monomolecular film on the metal surface to solve the problems of high toxicity and change of the prior metal color after treatment and so on in the prior discoloration resisting process. The method comprises the steps of degreasing, polishing, activation, surface treatment, cleaning and drying, and avoids the use of poisonous chemicals, is easy to operate and is not affected by the shapes of the surfaces of metal pieces. The treated metal obviously improves discoloration resistance, and the metal gloss and appearance of the surface have no visible change, therefore the process has wider application compared with the prior process.

Description

Technical field [0001] The invention relates to a metal surface treatment process, in particular to a metal anti-tarnishing method utilizing a self-assembled monomolecular film. Background technique [0002] Copper, silver, gold and other metals and their alloys are widely used in decoration, coinage and other fields due to their magnificent luster. However, due to the atmospheric H 2 S, SO 2 During the production, storage, storage and use process, the surface is easy to form a thin corrosion film and change color. The copper coins issued by our country - special commemorative coins for rare wild animals, during the collection and preservation process, the surface of the coin has a phenomenon of decline in smoothness. It is more intuitive that there are pink water stains on the surface of the coin. At the same time, silver and gold commemorative coins also have similar problems in the collection process, which not only affects the appearance, but also affects their collect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/02
Inventor 梁成浩王鹏黄乃宝
Owner DALIAN MARITIME UNIVERSITY
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