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Passivation liquid for zincing tube and passivation process thereof

A technology of passivation solution and galvanized pipe, which is applied in the coating process of metal materials, etc., can solve environmental pollution and other problems, and achieve the effects of no pollution, convenient material extraction, and good acid, alkali and weather resistance.

Inactive Publication Date: 2009-07-29
张国良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned defects, the technical problem to be solved in the present invention is: for existing galvanized products containing Cr which seriously pollutes the environment +6 problem, providing a Cr-free +6 passivation solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] Composition in the passivation solution of Example 1 among the present invention: 31.1g of chromium trichloride, 150g of acidic silica colloid, 40g of film-forming agent silane coupling agent and 20g of stabilizer citric acid, the concentrated passivation of making 1L liquid.

[0013] Mix the prepared concentrated passivation solution with water to a volume of 10L, Cr 3+ The concentration of the passivation bath is 1g / L, and the pH value of the passivation bath is adjusted to 2.5 with a mixed acid of nitric acid and sulfuric acid with a mixing ratio of 1:1. , the passivation time is 10-15s. With the progress of the passivation process, each active ingredient is consumed, and the passivation bath needs to be replenished in time so that the concentration of trivalent chromium in the passivation bath is 0.5-2g / L , the concentration of acidic silica colloid is 10-20g / L, the concentration of film-forming agent is 3-5g / L, the concentration of stabilizer is 1.5-2.0g / L, and th...

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PUM

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Abstract

The invention relates to the technology of metal passivation, in particular to a passivation solution not containing hexavalent chrome and a passivation process thereof. The passivation solution used for a galvanized tube contains trivalent chrome, a film former and silicon dioxide, wherein concentration of the trivalent chrome is 0.5-2g / L; concentration of the acidic silicon dioxide colloid is 10-20g / L; concentration of the film former is 3-5g / L; and concentration of a stabilizing agent is 1.5-2.0g / L. The passivation solution and the process solve the problem that the existing galvanized product contains Cr which seriously pollutes environment.

Description

technical field [0001] The invention relates to metal passivation technology, in particular to a passivation solution not containing hexavalent chromium and a passivation process thereof. Background technique [0002] In order to improve the aesthetics and corrosion resistance of the galvanized surface, Cr +6 Chromate passivation treatment is carried out on it. In the past, in order to obtain a blue-white galvanized passivation film, Cr +6 Rainbow passivation, which is then bleached with alkali. Later, a low-chromium one-time blue-white passivation process was invented, the content of hexavalent chromium in the passivation solution was reduced to 2-5g / L, and 0.2-0.5g / L of chromic anhydride was added in the final hot water scalding In order to improve the salt spray resistance test time of the product, there are two deficiencies in the blue-white passivation process adopted above: one still needs to use Cr +6 , and there are still 0.002~0.004mg / dm in the passivation film o...

Claims

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Application Information

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IPC IPC(8): C23C22/06C23C22/48
CPCC23C2222/10
Inventor 张国良
Owner 张国良