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Manganese-zirconium chromate-free passivating solution for surface treatment of aluminum alloy and method for manganese-zirconium chromate-free passivating treatment of surface of aluminum alloy

An aluminum alloy surface, chromium-free passivation technology, applied in the direction of metal material coating technology, can solve the problems of spraying production enterprises, difficult to judge the film formation status, etc., to ensure long-term continuous production and a wide range of working temperatures , the effect of system stability

Inactive Publication Date: 2015-03-04
毛山红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the zirconium-titanium series is generally a colorless conversion film after chromium-free passivation, and it is difficult to make timely, accurate and intuitive judgments on the film formation status from the appearance, which has caused great difficulties for the actual application of spraying manufacturers.

Method used

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Effect test

Embodiment 1

[0015] In this embodiment, when preparing a quantitative volume of chromium-free passivation solution, first weigh the required components according to the following mass volume concentration: potassium permanganate 0.01g / L, fluozirconic acid 0.01g / L, sodium fluoride 0.01 g / L; Then add the above components to about 80% of the quantitative volume of deionized water and mix evenly and adjust the pH value of the chromium-free passivation solution to 3.0-6.8 with sodium hydroxide and sulfuric acid. When the pH value is less than this range Add sodium hydroxide, and add sulfuric acid when the pH value is greater than this range. The specific amount depends on the actual situation. If the pH value is in this range from the beginning, you can choose not to add it; finally add deionized water to make chromium-free The volume of the passivation solution reaches a quantitative volume.

[0016] When using chromium-free passivation solution to treat the surface of aluminum alloy, since th...

Embodiment 2

[0018] In this embodiment, when preparing a quantitative volume of chromium-free passivation solution, first weigh the required components according to the following mass volume concentration: sodium permanganate, ammonium permanganate total 10g / L, potassium fluorozirconate, zirconium fluoride A total of 10g / L of sodium fluoride and ammonium fluozirconate, a total of 4g / L of potassium fluoride, ammonium fluoride, and ammonium bifluoride; , sulfuric acid, nitric acid, and hydrofluoric acid to adjust the pH value of the chromium-free passivation solution to 3.5-5.0. When the pH value of the chromium-free passivation solution is lower than this range, one or two of potassium hydroxide and ammonia must be added When the pH value of the chromium-free passivation solution is greater than this range, it is necessary to add one or more mixtures of phosphoric acid, nitric acid, and hydrofluoric acid. The specific dosage depends on the actual situation. If the pH If the value is in this...

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Abstract

The invention discloses a manganese-zirconium chromate-free passivating solution for surface treatment of aluminum alloy and a method for manganese-zirconium chromate-free passivating treatment of the surface of aluminum alloy. The manganese-zirconium chromate-free passivating solution comprises the following components in mass-volume concentration: 0.01-10g / L of a permanganate, 0.01-10g / L of fluorozirconate or fluorozirconic acid, 0.01-4g / L of an accelerator and a pH value adjusting agent. A solvent used for preparing the manganese-zirconium chromate-free passivating solution is deionized water, and the pH value of the manganese-zirconium chromate-free passivating solution is adjusted to 3.0-6.8 due to the use amount of the pH value adjusting agent. The method comprises the following steps of soaking the aluminium alloy into the manganese-zirconium chromate-free passivating solution at the temperature of 5-40 DEG C or spraying the manganese-zirconium chromate-free passivating solution onto the aluminum alloy at the temperature of 5-40 DEG C, carrying out reaction on the manganese-zirconium chromate-free passivating solution and the aluminium alloy for 10-240 seconds, and then washing the aluminum alloy with water.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy surface treatment, in particular to a manganese-zirconium-based chromium-free passivation solution for aluminum alloy surface treatment and a treatment method thereof. Background technique [0002] Aluminum processing enterprises have traditionally used hexavalent chromium chromization process before spraying aluminum. Hexavalent chromium is one of the most toxic heavy metals identified so far. It is highly carcinogenic and can cause blood diseases, bone diseases, premature hair loss, and premature skin aging. It will also accumulate in the environment and endanger human health for a long time. Therefore, the use of chromium-free passivation pre-treatment technology for aluminum spraying is the general trend. Most of the popular chromium-free passivation products on the market are zirconium-titanium products. However, the zirconium-titanium system is generally a colorless conversion film ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34
CPCC23C22/34
Inventor 毛山红
Owner 毛山红
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