Chromate-free passivant for cold-roll steel sheet and galvanized steel sheet roller coating before coating and preparing method

A technology of chromium-free passivation agent and galvanized steel sheet, applied in the direction of metal material coating process, etc., can solve the problems of unfavorable environmental protection, complicated waste water treatment, high cost, etc., and achieve the effect of saving waste water treatment cost and benefiting environmental protection.

Inactive Publication Date: 2016-03-30
DALIAN SANDAAOKE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the spray chromization treatment basically adopts the highly toxic chromate passivation process, and the wastewater treatment is complicated and costly, which is not conducive to environmental protection.
However, some companies use chromium-free passivators, but the bonding force of the roller coating paint film does not reach the 0-level standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] The raw materials and mass percentages used are as follows: 50% fluorozirconic acid 8%, 50% phytic acid 0.1%, citric acid 0.8%, sodium bromate 0.5%, ammonium molybdate 0.5%, manganese nitrate 0.5%, ferric nitrate 0.5%, ammonium bicarbonate 1%, ammonium bifluoride 2.5%, pure water balance.

[0009] The preparation method is carried out according to the following steps: firstly, the calculated and weighed pure water is added to the stainless steel reaction kettle, the stirrer is started to control the rotation speed of 60-80 rpm, and then the calculated and weighed fluorozirconic acid, phytic acid, and citric acid are sequentially mixed. , sodium bromate, ammonium molybdate, manganese nitrate, ferric nitrate, ammonium bicarbonate, and ammonium bifluoride are slowly added to the reaction kettle, stirring while adding, until the solution is beige or light brown and transparent.

Embodiment 2

[0011] The raw materials and mass percentages used are as follows: 50% fluorozirconic acid 4%, 50% phytic acid 0.6%, citric acid 0.8%, sodium bromate 0.5%, ammonium molybdate 0.1%, manganese nitrate 1.5%, ferric nitrate 0.1%, ammonium bicarbonate 2.5%, ammonium bifluoride 1%, pure water balance.

[0012] The preparation method is the same as in Example 1.

Embodiment 3

[0014] The raw materials and mass percentages used are as follows: 50% fluorozirconic acid 6%, 50% phytic acid 0.4%, citric acid 0.5%, sodium bromate 1%, ammonium molybdate 0.25%, manganese nitrate 1%, ferric nitrate 0.25%, ammonium bicarbonate 1.5%, ammonium bifluoride 2%, pure water balance.

[0015] The preparation method is the same as in Example 1.

[0016] When in use, add water according to the mass percentage of 3~6% in Example 1, 2 or 3 of the present invention, and spray at room temperature for 20 seconds. After testing, the bonding force between the surface of the cold-rolled steel sheet and the galvanized steel sheet after passivation treatment and the roll coating film layer reaches grade 0.

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PUM

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Abstract

The invention discloses chromate-free passivant for cold-roll steel sheet and galvanized steel sheet roller coating before coating. According to the chromate-free passivant for cold-roll steel sheet and galvanized steel sheet roller coating, the bonding force between a surface and a roller coating film can reach the level 0. The chromate-free passivant includes, by mass percent, 4-8% of hexafluorozirconic acid with the mass concentration being 50%, 0.1-0.6% of phytic acid with the mass concentration being 50%, 0.1-0.8% of citric acid, 0.5-1.5% of sodium bromated, 0.1-0.5% of ammonium molybdate, 0.5-1.5% of manganous nitrate, 0.1-0.5% of ferric nitrate, 1-2.5% of ammonium bicarbonate, 1-2.5% of ammonium bifluoride and the balance pure water. The preparing method includes the steps that the pure water which is calculated and weighed is added into a stainless steel reaction kettle, a stirrer is started, and the rotating speed is controlled to be 60-80 turns per minute; and then the hexafluorozirconic acid, the phytic acid, the citric acid, the sodium bromated, the ammonium molybdate, the manganous nitrate, the ferric nitrate, the ammonium bicarbonate and the ammonium bifluoride which are calculated and weighed are slowly added into the reaction kettle in sequence, and stirring is conducted while adding is performed till a solution is in a maize-yellow or light brown transparent state.

Description

technical field [0001] The present invention relates to a metal film treatment agent, in particular to a cold-rolled steel sheet and galvanized steel sheet before roll-coating, a chromium-free passivation agent and a preparation method thereof, which can make the bonding force between the surface and the roll-coating film layer reach 0 level. Background technique [0002] Cold-rolled steel sheets, galvanized steel sheets and other metal sheets have oil scale, floating rust, heavy rust, oxide scale, etc. on the surface. Therefore, before roller coating and other processes, the above oil scale needs to be removed, and most of them need to be passivated It is treated to form a passivation film with certain roughness, porosity and adsorption on the surface to enhance the corrosion resistance of the workpiece surface and improve the adhesion between the workpiece surface and the coating or other organic surface treatment layers. For example, the existing process flow of roller co...

Claims

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Application Information

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IPC IPC(8): C23C22/44
Inventor 潘德顺朱国玉王剑黄文飞郑力玮李文瀚
Owner DALIAN SANDAAOKE CHEM
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