A kind of trivalent chromium multicolored passivator
A technology of passivating agent and trivalent chromium, which is applied in the coating process of metal materials, etc., can solve the problems that the trivalent chromium passivation film does not have self-healing property and the stability of the passivation film is poor, and achieves low operating temperature and high operating efficiency. The effect of simplicity and wide process range
Inactive Publication Date: 2011-11-30
JIANGSU FEITUO INTERFACE ENG TECH CO LTD
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Problems solved by technology
[0005] Using the existing trivalent chromium multicolor passivation agent technology to passivate the galvanized layer, although the salt spray performance is better and the passivation film is brighter, but because the passivation solution contains oxidizing substances, such as cobalt salts, nitrates, etc. Trivalent chromium is oxidized to hexavalent chromium in a passivating agent
And because the trivalent chromium passivation film is not self-healing, the stability of the passivation film is poor
Method used
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Embodiment 1
[0021] Raw material selection: select the raw materials according to the weight ratio as follows:
[0022]
[0023] Preparation:
[0024] 1. After adding an appropriate amount of water to the reaction kettle, add trivalent chromium main salt, chelating agent, reducing agent, and salt spray additive, and then stir at 80°C for 2 hours;
[0025] 2. After cooling the solution to room temperature, add surfactant, and stir for 30 minutes to complete the preparation.
Embodiment 2
[0027] Raw material selection: select the raw materials according to the weight ratio as follows:
[0028]
[0029]
[0030] Preparation method: with embodiment one
[0031] In addition, the present invention has a variety of combinations in the selection of raw materials, and is not limited to the specific scheme selected in the specific examples.
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A trivalent chromium multicolored passivator belongs to the technical field of surface treatment. This passivating agent is used for trivalent chromium multicolored passivating agent after passivation treatment after various electroplating galvanizing processes, and hexavalent chromium will not appear during use. It can prevent the aging of the passivation film and last for a long time through the detection by boiling method. Time to keep the passivation film bright, excellent corrosion resistance. The passivating agent is composed of: 15-30% trivalent chromium composite main salt, 10-25% composite chelating agent, 3-8% reducing agent, 3-10% salt spray resistance additive, 1-3% surfactant, etc. , and the balance is composed of water.
Description
technical field [0001] The invention relates to a trivalent chromium multicolored passivator for zinc plating. The invention belongs to the technical field of metal surface treatment. Background technique [0002] In order to improve the corrosion resistance of steel parts, the surface is usually galvanized or dealloyed. For the galvanized layer, zinc is a relatively active metal, and it is prone to chemical reactions with acidic and alkaline substances. Therefore, if no passivation treatment is taken after galvanizing, it will quickly undergo chemical discoloration and damage. , corrosion etc. In order to further improve the corrosion resistance and decoration of the coating, the coating must be passivated to produce a passivation film with high corrosion resistance and good decoration. [0003] For a long time, the passivation after electroplating and surface treatment has been passivated by hexavalent chromate, but hexavalent chromium is highly toxic and carcinogenic, ...
Claims
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Inventor 吕明春周德龙匡登云郑建邢丹丹陆晓晓朱兴国
Owner JIANGSU FEITUO INTERFACE ENG TECH CO LTD
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