Multicolor trivalent chromium passivant for zinc coating, and preparation method and passivation treatment method thereof

A passivation treatment, galvanized layer technology, applied in the direction of metal material coating process, etc., can solve the problems of single color and complicated use, and achieve the effect of reducing production cost, simple operation and convenient use.

Active Publication Date: 2014-06-11
陕西美坚默克高科技发展有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a trivalent chromium multi-color passivator for galvanized layer and its preparation method and passivation treatment method, which solves the problems of single color and complex use of the existing passivation treatment

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  • Multicolor trivalent chromium passivant for zinc coating, and preparation method and passivation treatment method thereof

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preparation example Construction

[0019] A kind of preparation method of the trivalent chromium multi-color passivator of galvanized layer, comprises the following steps:

[0020] 1) First add an appropriate amount of water to the enamel reactor, turn on the agitator, and then add chromic anhydride. After the chromic anhydride is completely dissolved, slowly add sulfuric acid under constant stirring. When the reaction temperature does not exceed 85°C, slowly add The sucrose is catalyzed, and when the solution in the reactor becomes a dark green state, the reaction ends at this moment, and the basic chromium sulfate aqueous solution is obtained;

[0021] 2) Cool down to 30-40°C, add chromium nitrate, diffusing agent, cobalt nitrate, hydrofluoric acid, citric acid, DL-tartaric acid in turn, after the raw materials are completely dissolved, add water to the total volume, and stir evenly to obtain the finished product.

[0022] In the following examples, the water used is distilled water, and the diffusing agent i...

Embodiment 1

[0025] A trivalent chromium multi-color passivator for galvanized layer, comprising chromic anhydride 69.9g / L, sulfuric acid 103.9g / L, sucrose 16.2g / L, chromium nitrate 40g / L, diffusing agent 20g / L, cobalt nitrate 80g / L, hydrofluoric acid 40g / L, citric acid 20g / L, DL-tartaric acid 20g / L, and the rest is water.

[0026] A kind of preparation method of the trivalent chromium multi-color passivator of galvanized layer, comprises the following steps:

[0027] 1) First add 210ml of water to the enamel reactor, turn on the agitator, then add chromic anhydride, after the chromic anhydride is completely dissolved, slowly add sulfuric acid under constant stirring, and slowly add sucrose to catalyze at a controlled reaction temperature of 85°C Reaction, when the solution in the reactor becomes a dark green state, the reaction ends at this moment, and the basic chromium sulfate aqueous solution is obtained;

[0028] 2) Cool down to 30-40°C, add chromium nitrate, diffusing agent, cobalt...

Embodiment 2

[0030] A kind of trivalent chromium multi-color passivator of galvanized layer, comprises chromic anhydride 65g / L, sulfuric acid 95g / L, sucrose 10g / L, chromium nitrate 10g / L, diffusion agent 10g / L, cobalt nitrate 20g / L, Hydrofluoric acid 10g / L, citric acid 5g / L, DL-tartaric acid 5g / L, and the rest is water.

[0031] A kind of preparation method of the trivalent chromium multi-color passivator of galvanized layer, comprises the following steps:

[0032] 1) First add 300ml of water to the enamel reactor, turn on the agitator, then add chromic anhydride, after the chromic anhydride is completely dissolved, slowly add sulfuric acid under constant stirring, and slowly add sucrose to catalyze at a controlled reaction temperature of 80°C Reaction, when the solution in the reactor becomes a dark green state, the reaction ends at this moment, and the basic chromium sulfate aqueous solution is obtained;

[0033] 2) Cool down to 30-40°C, add chromium nitrate, diffusing agent, cobalt nit...

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Abstract

The invention provides a multicolor trivalent chromium passivant for a zinc coating, and a preparation method and a passivation treatment method thereof. The multicolor trivalent chromium passivant for the zinc coating comprises 65-75g / L of chromic anhydride, 95-110g / L of sulfuric acid, 10-20g / L of sucrose, 10-200g / L of chromic nitrate, 10-100g / L of diffusant, 20-200g / L of cobalt nitrate, 10-200g / L of hydrofluoric acid, 5-150g / L of nitric aicd, 5-150g / L of DL-tartaric acid and the balance of water. The invention provides a preparation method and an application method for the passivant. Film layers of two colors can be obtained through passivation treatment of the passivant, one is a blue film layer and the other one is a colorful film layer, the product belongs to the environmentally-friendly passivant, is free from toxic substances such as hexavalent chromium, mercury, lead, cadmium, phenlyate and the like, thus having no damage to a human body and environments.

Description

technical field [0001] The invention relates to a passivating agent and a passivating treatment method thereof, in particular to a trivalent chromium multi-color passivating agent for a galvanized layer, a preparation method and a passivating treatment method thereof. 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 passivation measures are not taken after galvanizing, it will quickly undergo chemical discoloration and damage. , corrosion etc. In order to further improve the anti-corrosion and decorative properties of the coating, electrostatic powder spraying and high-pollution environment painting are traditionally used, but the sprayed film and paint layer are easy to fall off after long-term use of the above processes. [0003] In or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/37
Inventor 段国敏
Owner 陕西美坚默克高科技发展有限责任公司
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