Chromate-free passivation liquid for zinc alloy

A chromium-free passivation and zinc alloy technology, which is applied in the coating process of metal materials, etc., can solve problems such as health hazards of plated parts, negative impacts on human health, and serious environmental pollution

Inactive Publication Date: 2017-08-25
XIAMEN RUNNER IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, chromate passivation solution is usually used for passivation. However, chromate passivation solution contains hexavalent chromium, which is highly toxic and seriously pollutes the environment. It is easy to cause harm to human health during the production and recycling process of plated parts. harm
[0004] Among the inorganic salt passivation formulas and processes, high chromic acid passivation causes serious environmental pollution and has a negative impact on human health. Low-chromium passivation solutions and ultra-low-chromium passivation solutions and their operating processes reduce environmental pollution and reduce cost of sewage treatment, but did not fundamentally solve the pollution problem of hexavalent chromium, and the corrosion resistance, solution stability and process operation of the passivation film are far behind the traditional high chromic acid passivation

Method used

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  • Chromate-free passivation liquid for zinc alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A chromium-free passivation solution for zinc alloys, which consists of the following components in parts by weight: 20 parts of sodium molybdate, 15 parts of titanium sulfate, 5 parts of potassium fatty acid, 10 parts of ester alcohol, 35 parts of hydrogen peroxide, hydroxyethyl 2 parts of cellulose, 40 parts of deionized water.

[0018] When the above-mentioned zinc alloy is passivated with a chromium-free passivation solution, the zinc alloy workpiece is degreased and dewaxed, then washed with hot water, then soaked in a pH=3 solution at 40°C for 15 seconds, and washed with water for 70 seconds. ℃ drying to complete the passivation treatment.

[0019] Zinc alloy passivation performance comparison test table

[0020] workpiece Passivation time s Acid salt spray test h Workpiece Appearance Zinc alloy 0 4 white corrosion Zinc alloy 15 16 no change

Embodiment 2

[0022] A chromium-free passivation solution for zinc alloys, which consists of the following components in parts by weight: 20 parts of sodium molybdate, 25 parts of titanium sulfate, 8 parts of potassium stearate, 7 parts of ester alcohol, 30 parts of hydrogen peroxide, and 5 parts of triol, 45 parts of deionized water.

[0023] When the above-mentioned zinc alloy is passivated with a chromium-free passivation solution, the zinc alloy workpiece is washed with hot water after degreasing and wax removal, and then soaked in a pH=4 solution at 60°C for 10 seconds after washing with water. ℃ drying to complete the passivation treatment.

[0024] Zinc alloy passivation performance comparison test table

[0025] workpiece Passivation time s Acid salt spray test h Workpiece Appearance Zinc alloy 0 4 white corrosion Zinc alloy 15 16 no change

Embodiment 3

[0027] A chromium-free passivation solution for zinc alloys, which consists of the following components in parts by weight: 20 parts of sodium molybdate, 25 parts of titanium sulfate, 8 parts of potassium myristate, 5 parts of n-octanol, 30 parts of hydrogen peroxide, glycerin 3 parts of alcohol, 50 parts of deionized water.

[0028] When the above-mentioned zinc alloy is passivated with a chromium-free passivation solution, the zinc alloy workpiece is washed with hot water after degreasing and wax removal, and then soaked in a pH=4 solution at 60°C for 10 seconds after washing with water. ℃ drying to complete the passivation treatment.

[0029] Zinc alloy passivation performance comparison test table

[0030] workpiece Passivation time s Acid salt spray test h Workpiece Appearance Zinc alloy 0 4 white corrosion Zinc alloy 15 16 no change

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Abstract

The invention discloses chromate-free passivation liquid for a zinc alloy. The chromate-free passivation liquid is composed of, by weight, 20-30 parts of sodium molybdate, 10-25 parts of titanous sulfate, 5-10 parts of a surface active agent, 5-10 parts of an assistant, 30-40 parts of hydrogen peroxide, 1-5 parts of a stabilizer and 30-50 parts of deionized water. The chromate-free passivation liquid is good in passivation effect, and the bonding force of a passivation film and a clad layer is high; and the decay resistance of the zinc alloy treated by the passivation liquid is obviously improved, and the problem of environmental pollution is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a chromium-free passivation solution for zinc alloys. Background technique [0002] Galvanizing and zinc alloys are widely used in the protection of steel surfaces. In order to improve its corrosion resistance, increase surface gloss and anti-pollution ability, passivation treatment is generally required after galvanizing and zinc alloys to form a dense and stable layer on the surface. higher film. [0003] In the prior art, chromate passivation solution is usually used for passivation. However, chromate passivation solution contains hexavalent chromium, which is highly toxic and seriously pollutes the environment. It is easy to cause harm to human health during the production and recycling process of plated parts. harm. [0004] Among the inorganic salt passivation formulas and processes, high chromic acid passivation causes serious environmental pollution and has a ...

Claims

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Application Information

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IPC IPC(8): C23C22/40
CPCC23C22/40
Inventor 金碧孙昇凌李明仁
Owner XIAMEN RUNNER IND CORP
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