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Brilliant tin plate chromium-free passivation solution and passivation method

A technology of chromium-free passivation and tin-plate, which is applied in the fields of phosphating and metal material coating technology, can solve the problems of poor corrosion resistance and oxidation resistance, and the lack of application of chromium-free passivation technology in industrial production, etc., to achieve High anti-oxidation performance, harm-resolving, high corrosion resistance and excellent effect

Inactive Publication Date: 2009-02-04
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although people have done a lot of research on the chromium-free passivation process of tinplate, but because of their corrosion resistance and oxidation resistance are not as good as tinplate passivated with chromate, so far, chromium-free passivation The process has never been used in industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Each liter of chrome-free passivation solution contains 20g of trisodium phosphate, 2g of cobalt sulfate, 3g of sodium molybdate, 40g of phosphoric acid, and the rest is water. The pH of the passivation solution is 4.5.

[0014] The above-mentioned chromium-free passivation solution was used to passivate the tin-plated plate, and electrochemical cathodic passivation was adopted. The passivation temperature was 70° C., and the passivation time was 20 seconds.

[0015] Use chromate passivation solution to passivate the tinplate of the same type and specification. The content of sodium dichromate in the passivation solution is 10g / L, and the passivation conditions are the same as the above conditions.

[0016] The tin plate sample passivated with the formula and process of this embodiment and the sample passivated with chromate were subjected to salt spray contrast test, laboratory atmospheric exposure test, coating adhesion test, oxidation resistance of tin layer Performa...

Embodiment 2

[0018] Each liter of chromium-free passivation solution contains 40g trisodium phosphate, 5g cobalt sulfate, 1g sodium molybdate, 20g phosphoric acid, and the rest is water. The pH value of the passivation solution is 5.

[0019] The above-mentioned chromium-free passivation solution was used to passivate the tin-plated plate, and electrochemical cathodic passivation was adopted. The passivation temperature was 80° C., and the passivation time was 1 second.

[0020] Use chromate passivation solution to passivate the tinplate of the same type and specification. The content of sodium dichromate in the passivation solution is 10g / L, and the passivation conditions are the same as the above conditions.

[0021] The tin plate sample passivated with the formula and process of this embodiment and the sample passivated with chromate were subjected to salt spray contrast test, laboratory atmospheric exposure test, coating adhesion test, oxidation resistance of tin layer Performance test...

Embodiment 3

[0023] Each liter of chromium-free passivation solution contains 50g of trisodium phosphate, 1g of cobalt sulfate, 2g of sodium molybdate, 60g of phosphoric acid, and the rest is water. The pH of the passivation solution is 3.5.

[0024] The above-mentioned chromium-free passivation solution was used to passivate the tin-plated plate, and electrochemical cathodic passivation was adopted. The passivation temperature was 60° C., and the passivation time was 8 seconds.

[0025] Use chromate passivation solution to passivate the tinplate of the same type and specification. The content of sodium dichromate in the passivation solution is 10g / L, and the passivation conditions are the same as the above conditions.

[0026] The tin plate sample passivated with the formula and process of this embodiment and the sample passivated with chromate were subjected to salt spray contrast test, laboratory atmospheric exposure test, coating adhesion test, oxidation resistance of tin layer Perform...

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Abstract

The invention discloses bright tin plate non-chromium passivation solution, wherein, each liter of passivation solution contains 20g to 70g of trisodium phosphate, 0.1g to 5g of cobalt sulfate, 0.5g to 3g of sodium molybdate, 20g to 75g of phosphoric acid, the rest is water, and the ph value of the passivation solution is 3 to 5. The invention also discloses a tinplate passivation method; in the passivation with the non-chromium passivation solution of the invention, the working temperature of the passivation solution is 50 DEG C to 80 DEG C, the passivation time is 1s to 20s, and the passivation method is electro-chemical cathode passivation or chemical passivation. The tin plate non-chromium passivation solution of the invention does not contain hexavalent chrome, conducts chemical passivation or electro-chemical cathode passivation to the tinplate, and enables the tinplate to have the same high corrosion resistance and high oxidation resistance with a chromate passivation process. The welding performance, the adhesion performance to the coating and the like of the tinplate passivated through the non-chromium passivation process also meet the level of the tinplate passivated by chromate, which fundamentally solves the harm of the tinplate passivated by chromate with hexavalent chrome to the human body and the environment.

Description

technical field [0001] The invention relates to a tinplate passivation solution, in particular to a chromium-free passivation solution for a bright tinplate, and also relates to a method for passivating a tinplate with the passivation solution. Background technique [0002] After the tinplate is electroplated and reflowed, in order to improve the corrosion resistance, oxidation resistance and anti-sulfur blackening performance of the tinplate, the tinplate should be passivated. At present, the tinplate is used in industrial production at home and abroad The passivation is carried out by chromate containing hexavalent chromium. Since hexavalent chromium is a highly toxic substance, it is very harmful to the human body and the environment, especially the use of tinplate is generally used as Food and beverage packaging materials, so it is more harmful to the human body. In order to reduce the harm of hexavalent chromium to the human body and the environment, countries all over...

Claims

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Application Information

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IPC IPC(8): C23C22/42C25D11/36
CPCC23C22/42
Inventor 柳长福郭玉华涂元强黄先球
Owner WUHAN IRON & STEEL (GROUP) CORP
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