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Novel galvanizing and chrome-free passivating technology

A new technology, the technology of galvanized layer, applied in the new field of galvanized chromium-free purification, can solve the problems of non-conductivity, poor weather resistance, unsatisfactory corrosion resistance effect, etc., and achieve the effect of eliminating pollution problems.

Inactive Publication Date: 2013-04-03
ZUNYI CHANGZHENG ELECTRIC POWER EQUIP SURFACE TREATMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The passivation film layer formed by these inorganic corrosion inhibitors is relatively thin, and the corrosion resistance effect is not satisfactory, and most of them are in the research and experiment stage; the organic protective film layer is coated on the surface of the Zn layer to improve the corrosion resistance of the Zn layer Performance, is to use an insoluble shielding film formed by organic matter, thereby enhancing the corrosion resistance of the film, but the organic film layer is generally thicker than the chemical passivation film, poor weather resistance, non-conductive, etc.; Chromium galvanizing passivation process, although the toxicity of trivalent chromium galvanizing passivation has been greatly reduced, and the stability of the process can easily cause the hexavalent chromium content on the galvanized surface to exceed the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A new technology for chromium-free purification of galvanized, using a passivation solution with a pH of 2.5, at a temperature of 35°C, to passivate the galvanized layer for 45-90s, and a blue passivation film can be obtained, the film color is uniform, and the passivation film is stable. Corrosion resistance increases with the increase of passivation solution temperature 50℃ and treatment time 300s.

Embodiment 2

[0016] A new technology for chromium-free purification of galvanized, using a passivation solution with a pH of 2.7, at a temperature of 36°C, to passivate the galvanized layer for 75s, and a blue passivation film can be obtained, with uniform color and corrosion resistance of the passivation film With the passivation solution temperature 48 ℃ and treatment time 210s increase.

Embodiment 3

[0018] A new technology for chromium-free purification of galvanized, using a passivation solution pH 3.0, at a temperature of 40 ℃, passivating the galvanized layer for 85s, and then a blue passivation film can be obtained, the color of the film is uniform, and the corrosion resistance of the passivation film is excellent. With the passivation solution temperature 49 and treatment time 300s increased.

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PUM

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Abstract

A novel galvanizing and chrome-free passivating technology is characterized in that passivating solution with the pH of 2.5 to 3.0 is used for passivating a zinc coating for 45 to 90 s at the temperature of 20 to 40 DEG C, so that a blue passive film can be obtained; and the corrosion resistance of the passive film is improved as the temperature (40 DEG C to 50 DEG C) of the passivating solution is increased and the processing time (100 s to 300 s) is prolonged. The novel galvanizing and chrome-free passivating technology can not only ensure the corrosion resistance of the surface coating of a product, but also solve the problem that the environment and operators are polluted by chrome during the galvanizing and passivating process.

Description

technical field [0001] The invention relates to a new chromium-free purification technology for galvanizing. Background technique [0002] As we all know, the galvanized layer on the surface of steel parts is an excellent sacrificial anodic coating, and the service life of steel parts can be effectively improved by the galvanized layer and the surface passivation treatment of the galvanized layer in the atmospheric environment. Therefore, galvanizing is one of the most commonly used electroplating processes for surface corrosion protection of parts. [0003] For the galvanized layer of parts, surface passivation is also required to effectively improve the corrosion resistance of the coating. The current passivation includes color, blue, black, etc. The passivation film on the surface effectively improves the surface decoration effect of the Zn coating and prolongs the time for the zinc coating to corrode and appear white rust. [0004] In the passivation solution of zinc p...

Claims

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Application Information

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IPC IPC(8): C23C22/06C23C22/02
Inventor 罗国辉
Owner ZUNYI CHANGZHENG ELECTRIC POWER EQUIP SURFACE TREATMENT CO LTD
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