Non-chromium passivation liquid used for electrolytic tinning steel plate and use method of non-chromium passivation liquid

A chromium-free passivation and tin-plating technology, which is applied in the field of steel plate surface treatment solution and chromium-free passivation solution, can solve the problem of high manufacturing cost of chromium-free passivation solution, and achieve the effect of no waste of electric energy and excellent performance

Active Publication Date: 2019-12-10
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a chromium-free passivation solution for tin-plated steel plate and its application

Method used

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  • Non-chromium passivation liquid used for electrolytic tinning steel plate and use method of non-chromium passivation liquid
  • Non-chromium passivation liquid used for electrolytic tinning steel plate and use method of non-chromium passivation liquid
  • Non-chromium passivation liquid used for electrolytic tinning steel plate and use method of non-chromium passivation liquid

Examples

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Effect test

Embodiment 1

[0031] Embodiment 1, a kind of chromium-free passivation solution that is used for electroplating tin steel plate, described chromium-free passivation solution contains mass concentration and is 5g / L zinc dihydrogen phosphate, 1g / L sodium nitrate, 0.2g / L OP-10 , 1g / L ammonium fluotitanate; the pH value of the chromium-free passivation solution is 1.0; the pH value of the chromium-free passivation solution is adjusted with phosphoric acid.

[0032] The above-mentioned method for using the chromium-free passivation solution for electroplated tin steel plate comprises the following steps:

[0033] 1) Electroplating the substrate of the tin-plated steel plate. After the cold-rolled continuous annealed steel plate is washed with alkali and pickled, it is cathodicly electrolyzed in the tin methanesulfonate bath. The bath temperature is 45°C, the tin ion concentration is 18g / L, and the free Acid concentration 50g / L, current density 1.0A / dm 2 , to obtain a coating thickness of 2.8g / m...

Embodiment 2

[0037] Embodiment 2, a kind of chromium-free passivation solution that is used for electroplated tin steel plate, described chromium-free passivation solution contains mass concentration and is 20g / L zinc dihydrogen phosphate, 5g / L sodium nitrate, 2g / L OP-10, 10g / L ammonium fluotitanate; the pH value of the chromium-free passivation solution is 2.0; the pH value of the chromium-free passivation solution is adjusted with phosphoric acid.

[0038] The above-mentioned method for using the chromium-free passivation solution for electroplated tin steel plate comprises the following steps:

[0039] 1) Electroplating the substrate of the tin-plated steel plate. After the cold-rolled continuous annealed steel plate is washed with alkali and pickled, it is cathodicly electrolyzed in the tin methanesulfonate bath. The bath temperature is 45°C, the tin ion concentration is 18g / L, and the free Acid concentration 50g / L, current density 1.0A / dm 2 , to obtain a coating thickness of 2.8g / m ...

Embodiment 3

[0043] Embodiment 3, a kind of chromium-free passivation solution that is used for electroplated tin steel plate, described chromium-free passivation solution contains mass concentration and is 15g / L zinc dihydrogen phosphate, 3g / L sodium nitrate, 1g / L OP-10, 6g / L ammonium fluotitanate; the pH value of the chromium-free passivation solution is 1.5; the pH value of the chromium-free passivation solution is adjusted with phosphoric acid.

[0044] The above-mentioned method for using the chromium-free passivation solution for electroplated tin steel plate comprises the following steps:

[0045] 1) Electroplating the substrate of the tin-plated steel plate. After the cold-rolled continuous annealed steel plate is washed with alkali and pickled, it is cathodicly electrolyzed in the tin methanesulfonate bath. The bath temperature is 45°C, the tin ion concentration is 18g / L, and the free Acid concentration 50g / L, current density 1.0A / dm 2 , to obtain a coating thickness of 2.8g / m 2 e...

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Abstract

The invention discloses non-chromium passivation liquid used for an electrolytic tinning steel plate and a use method of the non-chromium passivation liquid. The technical problem that the manufacturing cost of existing non-chromium passivation liquid used for an electrolytic tinning steel plate is high. The non-chromium passivation liquid used for the electrolytic tinning steel plate contains water and comprises, by mass concentration, 5 g/L-20 g/L of zinc dihydrogen phosphate, 1 g/L-5 g/L of sodium nitrate, 0.2 g/L-2 g/L of OP-10 and 1 g/L to 10 g/L of ammonium fluorotitanate. The pH value of the non-chromium passivation liquid is 1.0 to 2.0; the pH value of the non-chromium passivation liquid is adjusted through phosphoric acid; and the use temperature of the non-chromium passivation liquid is 30 DEG C to 50 DEG C. The non-chromium passivation liquid can be directly sprayed, no waste liquid is generated, and the manufacturing and use processes are environment-friendly.

Description

technical field [0001] The invention relates to a steel plate surface treatment liquid, in particular to a chromium-free passivation liquid used for tin-plated steel plates and a using method thereof, belonging to the technical field of metal surface treatment. Background technique [0002] Cold-rolled tin-plated steel sheets are widely used in the food, beverage, and packaging industries. The main production processes of tin-plated steel sheets are alkaline cleaning, pickling, electroplating, reflow and passivation. Passivation is the last process in the production process of tinplate, which is used to improve the appearance and corrosion resistance of tinplate. At present, the commonly used method in production is to treat with hexavalent chromium. The passivation film obtained after chromate passivation treatment is very thin, with excellent corrosion resistance and simple process. It has long been the most common method in the production of tinplate. A passivation treat...

Claims

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Application Information

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IPC IPC(8): C23C22/36C25D5/48C25D5/50C25D3/30
CPCC23C22/362C25D5/48C25D5/505C25D3/30
Inventor 陆永亮曹美霞
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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