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Chromium-free passivation solution

A passivation solution and solution technology, applied in the direction of metal material coating process, etc., can solve the problems of human body and environmental hazards and great harm, and achieve the effect of speeding up the film forming process, improving the stability and improving the passivation efficiency.

Active Publication Date: 2013-05-22
TIANCHANG FEILONG BRAND STEEL GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] After tinning is electroplated and reflowed, in order to improve the corrosion resistance, oxidation resistance and anti-sulphurization blackening performance of the tinplate, the tinplate should be passivated. In the prior art, the passivation of the tinplate Chromium is passivated by chromate of hexavalent chromium. Since hexavalent chromium is a highly toxic substance, it is very harmful to the human body and the environment. Especially, the tinplate is generally used as a packaging material for food. , which is extremely harmful and urgently needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A kind of chromium-free passivation solution, the raw material of ratio according to weight percentage comprises:

[0020] Trisodium phosphate (20-70), cobalt sulfate (1-4), phosphoric acid (1-3), boric acid (0.5-0.7), hydrogen peroxide (1-3), water (80-200).

Embodiment 2

[0022] A kind of chromium-free passivation solution, the raw material of ratio according to weight percentage comprises:

[0023] Trisodium phosphate (40-70), cobalt sulfate (3-4), phosphoric acid (1-2), boric acid (0.5-0.6), hydrogen peroxide (1-2), water (100-150).

Embodiment 3

[0025] The manufacture method of the chromium-free passivation solution, the chromium-free passivation solution is obtained through the following steps:

[0026] S1. Pour the mixture of trisodium phosphate crystals and cobalt sulfate crystals into water and stir evenly to form solution A;

[0027] S2. Take a certain amount of phosphoric acid, slowly add it to the solution A, and stir while adding to form a solution B;

[0028] S3. Pour a certain amount of boric acid into a certain amount of water, fully stir until the boric acid is completely dissolved to form solution C, then pour solution B into solution C, and stir while pouring to form solution D;

[0029] S4. Take a certain amount of hydrogen peroxide, add it to solution D, and stir while adding to form solution E;

[0030] S5, adjusting the pH of the solution E to 1.5-2.5.

[0031] The passivation solution uses trisodium phosphate and cobalt sulfate instead of traditional chromium salts as the main film-forming substan...

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PUM

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Abstract

The invention discloses a chromium-free passivation solution. The chromium-free passivation solution comprises the following raw materials in percentage by weight: 20-70% of trisodium phosphate, 1-4% of cobalt sulfate, 1-3% of phosphoric acid, 0.5-0.7% of boracic acid, 1-3% of hydrogen peroxide and 80-200% of water. The passivation solution does not contain chromium and is environment-friendly, and a tin plate passivated by the passivation solution has higher corrosion resistance and oxidization resistance.

Description

technical field [0001] The invention relates to a chromium-free passivation solution. Background technique [0002] After tinning is electroplated and reflowed, in order to improve the corrosion resistance, oxidation resistance and anti-sulphurization blackening performance of the tinplate, the tinplate should be passivated. In the prior art, the passivation of the tinplate Chromium is passivated by chromate of hexavalent chromium. Since hexavalent chromium is a highly toxic substance, it is very harmful to the human body and the environment. Especially, the tinplate is generally used as a packaging material for food. , is extremely harmful and needs to be improved urgently. Contents of the invention [0003] For the problems existing in the prior art, the purpose of the present invention is to propose a chromium-free passivation solution, which is environmentally friendly, and the tin-plated plate passivated by it has higher corrosion resistance and corrosion resistance....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/10
Inventor 孙长志
Owner TIANCHANG FEILONG BRAND STEEL GRID
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