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Zinc coat environmental-friendly passivation solution and use method thereof

A kind of passivation solution, environment-friendly technology, applied in the direction of metal material coating process, etc., can solve the problems of unacceptable, passivation film corrosion resistance, passivation speed corrosion resistance are far different, difficult to meet, etc. The effect of solving environmental pollution and using simple and easy methods

Inactive Publication Date: 2010-11-17
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned existing inorganic salt passivation film formation and organic matter passivation film formation passivation solution have been greatly improved in non-toxic and environmental protection, the corrosion resistance and passivation of the passivation film after the above-mentioned passivation solution treatment The speed is far from the corrosion resistance of the traditional chromate passivation film, and it is difficult to meet the requirements of modern galvanizing production
So far, there is still no chromium-free passivation solution with satisfactory corrosion resistance, which is difficult to be generally accepted by people.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 90g of sodium molybdate, 30g of sodium tungstate, 3g of titanyl sulfate, 15g of acrylic acid, 40g of hydrogen peroxide, and 10g of phytic acid in deionized water to prepare a 1L solution, and adjust it to pH=2 with phosphoric acid.

[0024] When using the above-mentioned galvanized layer to passivate the galvanized sheet with an environment-friendly passivation solution,

[0025] First, the surface of the galvanized sheet to be passivated is chemically degreased with a degreasing solution, rinsed with tap water, rinsed with deionized water, and dried with hot air for use;

[0026] Then the passivation solution is heated to 65°C;

[0027] Then immerse the purified galvanized sheet in the passivation solution for 0.5-1s passivation;

[0028] Finally, the passivation-treated galvanized sheet is baked with hot air at 50-55°C for 10 minutes to form a passivation film.

[0029] Neutral salt spray corrosion test (NSS): put the galvanized sheet sample passivated by t...

Embodiment 2

[0032] Dissolve 100 g of sodium molybdate, 30 g of sodium tungstate, 3 g of titanyl sulfate, 20 g of acrylic acid, 20 g of hydrogen peroxide, and 5 g of phytic acid in deionized water to prepare a 1 L solution, and adjust the pH to 1.5 with phosphoric acid.

[0033] When using the above-mentioned galvanized layer to passivate the galvanized sheet with an environment-friendly passivation solution,

[0034] First, the surface of the galvanized sheet to be passivated is chemically degreased with a degreasing solution, rinsed with tap water, rinsed with deionized water, and dried with hot air for use;

[0035] Then the passivation solution is heated to 60°C;

[0036] Then spray the passivation solution on the surface of the purified galvanized sheet to passivate for 1-2s;

[0037] Finally, the passivation-treated galvanized sheet is baked with hot air at 55-60°C for 10 minutes to form a passivation film.

[0038] The galvanized sheet after the passivation treatment in the presen...

Embodiment 3

[0040] Dissolve 100g of sodium molybdate, 20g of sodium tungstate, 5g of titanyl sulfate, 20g of acrylic acid, 20g of hydrogen peroxide, and 10g of phytic acid in deionized water to prepare a 1L solution, and adjust the pH to 2.5 with phosphoric acid.

[0041] When using the above-mentioned galvanized layer to passivate the galvanized sheet with an environment-friendly passivation solution,

[0042] First, the surface of the galvanized sheet to be passivated is chemically degreased with a degreasing solution, rinsed with tap water, rinsed with deionized water, and dried with hot air for use;

[0043] Then the passivation solution is heated to 50°C;

[0044] Then apply the passivation solution on the surface of the purified galvanized sheet, passivate for 2-3s;

[0045] Finally, bake the passivated galvanized sheet with hot air at 60-65°C for 5 minutes to form a passivation film.

[0046]The galvanized sheet after the passivation treatment in the present embodiment is carried...

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PUM

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Abstract

The invention discloses a zinc coat environmental-friendly passivation solution and a use method thereof. The passivation solution is formed by dissolving a solute consisting of a plurality of materials into deionized water, wherein the solute in the solution comprises the following components: 80-120g / L of sodium molybdate, 20-30g / L of sodium tungstate, 2-7g / L of titanyl sulfate, 5-10g / L of phytic acid, 15-50g / L of acrylic acid and 20-40g / L of hydrogen peroxide, wherein the pH value of the solution is regulated to 1.5-2.5 by using dilute acid. It is found that the zinc coat environmental-friendly passivation solution contains no chromium ions and thoroughly solves the problem of environment pollution brought by chromating; through salt spray test examination, a zinc coating plate passivated by the passivation solution has corrosion resistance approximately consistent with that of the traditional passivation solution; meanwhile, the use method is simple and easy.

Description

technical field [0001] The invention belongs to the field of steel production, and in particular refers to an environment-friendly passivation solution for galvanized layers and a use method thereof. Background technique [0002] After the galvanized products come off the production line, due to changes in the temperature and humidity of the outside air during storage and transportation, condensation will occur on the surface of the galvanized layer, causing rust (white rust) or discoloration (gray). In order to prevent corrosion of galvanized products, manufacturers of galvanized products must carry out surface passivation treatment. The traditional passivation treatment uses chromate as a treatment agent. After chromate treatment, a passivation film is formed on the surface of the zinc product. This film has good isolation performance and self-repair performance, making the zinc coating very Good corrosion resistance. Although the chromate passivation film has a good pro...

Claims

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Application Information

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IPC IPC(8): C23C22/40C23C22/42
Inventor 刘建容张万灵涂元强蔡捷石争鸣
Owner WUHAN IRON & STEEL (GROUP) CORP
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