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Phosphor molybdenum heteropolyacid inactivating treatment liquid used for heat zinc coating plate

A phosphomolybdenum heteropolyacid and passivation treatment technology, which is applied in the coating process of metal materials, etc., can solve the problems of failing to meet the passivation quality requirements of galvanized sheets, and cannot replace hexavalent chromium passivation treatment, etc. Product safety factor, low cost, and the effect of meeting corrosion resistance requirements

Inactive Publication Date: 2008-04-30
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It can be seen that there is a big gap between the corrosion resistance of the passivation film obtained by the chromate-free passivation treatment and the corrosion resistance of the hexavalent chromium passivation film, which cannot meet the quality requirements of galvanized plate passivation, and cannot replace the hexavalent chromium passivation film. Chromium passivation treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: Mix 15000ppm of sodium molybdate and 7300ppm of sodium phosphate together and stir thoroughly for 30 minutes. Then add 2000ppm nitrate and keep stirring.

[0026] Step 2: Take 15000ppm water-soluble polymer compound alkyl silane, add 100ml water to the reagent bottle, stir in a water bath at 55°C for 4h, then let it stand in a water bath at 55°C for 24h, then add 4000ppm non-ionic surfactant Agent alkylphenol polyoxyethylene ether, fully stirred for 30min.

[0027] Step 3: Slowly add the solution prepared in step 2 to the solution prepared in step 1 under constant stirring, and adjust the pH value to 2, and finally dilute to 1000ml.

[0028] The treated hot-dip galvanized parts are immersed in the treatment solution prepared according to the above steps (the treatment solution is heated to 45°C) for passivation treatment. The passivation treatment time is 45s, and the parts are taken out and left in the air for 0.5min. After washing with water, put it into an ...

Embodiment 2

[0030] Step 1: Mix 23000ppm of ammonium molybdate and 11000ppm of sodium phosphate, and stir thoroughly for 30 minutes. Then add 5000ppm nitrate, stirring constantly.

[0031] Step 2: Take 5000ppm water-soluble polymer polyacrylic acid, add 300ml water to the reagent bottle, stir in a water bath at 55°C for 4h, then let it stand in a water bath at 55°C for 24h, then add 1000ppm nonionic surfactant Fatty alcohol polyoxyethylene ether, fully stirred for 30 minutes.

[0032] Step 3: Slowly add the solution prepared in step 2 to the solution prepared in step 1 under constant stirring, and adjust the pH value to 3, and finally dilute to 1000ml.

[0033] The pre-treated hot-dip galvanized parts are immersed in the treatment solution prepared according to the above steps (the treatment solution is heated to 50°C) for passivation treatment, the passivation treatment time is 60s, and the parts are taken out and left to stand in the air for 0.5min , after washing with water, put it in...

Embodiment 3

[0035] Step 1: Mix 20000ppm of sodium molybdate and 9000ppm of sodium phosphate together and stir thoroughly for 30min. Then add 4000ppm nitrate, stirring constantly.

[0036] Step 2: Take 9000ppm of the copolymer of acrylic acid and methacrylic acid, a water-soluble polymer compound, add 200ml of water to the reagent bottle, stir in a water bath at 50°C for 4h, then let it stand in a water bath at 55°C for 24h, then add 1000ppm Non-ionic surfactant nonylphenol polyethylene glycol ether, fully stirred for 30min.

[0037] Step 3: Slowly add the solution prepared in step 2 to the solution prepared in step 1 under constant stirring, and adjust the pH value to 2.5, and finally dilute to 1000ml.

[0038]The pre-treated hot-dip galvanized parts are immersed in the treatment solution prepared according to the above steps (the treatment solution is heated to 45°C) for passivation treatment. The passivation treatment time is 30s, and the parts are taken out and left in the air for 0.5...

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Abstract

The invention relates to a phosphorus-molybdenum heteropolyacid passivation treatment solution and a preparation method for hot-dip galvanized sheets. The passivation treatment solution consists of 15000-23000 ppm of molybdate, 7300-11000 ppm of sodium phosphate, and 2000-5000 ppm of nitrate , 5000-15000ppm of at least one water-soluble polymer compound, 1000-4000ppm of at least one non-ionic surfactant, the solution pH value is 2-3; the preparation method is to mix molybdate and sodium phosphate first, Then add nitrate; add non-ionic surfactant into the water-soluble polymer compound, then add it into the solution prepared above, adjust the pH value to 2-3, and set the volume to 1000ml. For the hot-dip galvanized sheet, the treatment temperature is 30-50°C, the time is 30-60s, and the drying temperature is 50-70°C, and the time is 5-25min. The treated hot-dip galvanized sheet has a salt spray corrosion resistance of more than 72 hours.

Description

technical field [0001] The invention relates to a surface treatment solution for hot-dip galvanized sheets, in particular to a phosphorus-molybdenum heteropoly purification treatment solution for hot-dip galvanized sheets and a preparation method thereof. Background technique [0002] Galvanizing is one of the important protection methods for steel materials, and it is widely used in aviation, electric power, transportation, construction, machinery and other industries. The galvanized layer is easily corroded in a humid environment, forming white loose corrosion products or turning into a dark color on the surface of the galvanized layer, which affects the appearance quality of the galvanized layer and the corrosion resistance of the galvanized layer. In order to improve the corrosion resistance of the galvanized layer, the passivation treatment process after galvanizing is mainly adopted. Zinc plating passivation is to immerse the plated parts in a chemical solution of a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/42
Inventor 刘常升郝建军安成强陈岁元
Owner NORTHEASTERN UNIV
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