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Two-in-one trivalent chromium blue white passivation solution for passivation and sealing and use process thereof

A technology of passivation solution and trivalent chromium, which is applied in the coating process of metal materials, etc., can solve the problems of increased passivation cost, more waste water, and increased cost of waste water treatment, and achieve good corrosion resistance and heat resistance, waste water Ease of handling, effect of improving plating quality

Inactive Publication Date: 2012-04-04
GUANGZHOU SANFU NEW MATERIALS TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the sealing agent is beneficial to prolong the neutral salt spray resistance time of the passivation film, there is an additional layer of sealing film on the blue-white passivation film. In addition to covering the blue of the passivation film and making it white, the entire plating The brightness of the zinc layer also decreases
In addition, due to an additional closed process, the cost of passivation increases, and the water consumption is large, resulting in more wastewater and increased wastewater treatment costs

Method used

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  • Two-in-one trivalent chromium blue white passivation solution for passivation and sealing and use process thereof
  • Two-in-one trivalent chromium blue white passivation solution for passivation and sealing and use process thereof
  • Two-in-one trivalent chromium blue white passivation solution for passivation and sealing and use process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] See Table 1 for the formula of passivation and sealing two-in-one trivalent chromium blue-white passivation solution.

[0033]

[0034] Among them, Cr 3+ Provided by chromium sulfate; SiO 3 2- Provided by sodium silicate with the balance being water.

[0035] Adopt the above-mentioned passivation and sealing two-in-one trivalent chromium blue-white passivation solution to carry out passivation and sealing treatment to the workpiece after electroplating treatment, which includes the following steps:

[0036] 1) Pre-plating treatment;

[0037] 2) Potassium chloride galvanizing;

[0038] The galvanized layer adopts Sanfu's SF-522 low-foaming / non-foaming potassium chloride galvanizing additive acid zinc coating (coating thickness ≥ 8um), and its basic operation process is as follows:

[0039] Potassium chloride 180 g / L

[0040] Zinc chloride 50 g / L

[0041] Boric acid 30 g / L

[0042] SF-522 Brightener 1ml / L

[0043] SF-522 softener 25ml / L

[0044] p...

Embodiment 2

[0062] See Table 2 for the formula of passivation and sealing two-in-one trivalent chromium blue-white passivation solution.

[0063]

[0064] Among them, Cr 3+ Provided by Chromium Nitrate, SiO 3 2- Provided by potassium silicate, the balance is water.

[0065] Adopt the above-mentioned passivation and sealing two-in-one trivalent chromium blue-white passivation solution to carry out passivation and sealing treatment to the workpiece after electroplating treatment, which includes the following steps:

[0066] 4) Pre-plating treatment;

[0067] 5) Potassium chloride galvanizing;

[0068] The galvanized layer adopts Sanfu's SF-522 low-foaming / non-foaming potassium chloride galvanizing additive acid zinc coating (coating thickness ≥ 8um), and its basic operation process is as follows:

[0069] Potassium chloride 200 g / L

[0070] Zinc chloride 60 g / L

[0071] Boric acid 33 g / L

[0072] SF-522 brightener 2 ml / L

[0073] SF-522 softener 30ml / L

[0074] pH 5...

Embodiment 3

[0092] See Table 3 for the formula of passivation and sealing two-in-one trivalent chromium blue-white passivation solution.

[0093]

[0094] Among them, Cr 3+ Provided by Chromium Chloride, SiO 3 2- Provided by lithium silicate with the balance being water.

[0095] Adopt the above-mentioned passivation and sealing two-in-one trivalent chromium blue-white passivation solution to carry out passivation and sealing treatment to the workpiece after electroplating treatment, which includes the following steps:

[0096] 7) Pre-plating treatment;

[0097] 8) Potassium chloride galvanizing;

[0098] The galvanized layer adopts Sanfu's SF-522 low-foaming / non-foaming potassium chloride galvanizing additive acid zinc coating (coating thickness ≥ 8um), and its basic operation process is as follows:

[0099] Potassium chloride 230 g / L

[0100] Zinc chloride 70 g / L

[0101] Boric acid 35 g / L

[0102] SF-522 brightener 3 ml / L

[0103] SF-522 softener 35ml / L

[0104]...

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Abstract

The invention discloses a two-in-one trivalent chromium blue white passivation solution for passivation and sealing, which comprises Cr<3+>, SiO3<2->, complexing agents, film formation accelerating agents and other metal salt, wherein in the passivation solution, the mass ratio of Cr<3+> to SiO3<2-> is 1 : (2.5 to 3.5). The invention additionally discloses a passivation and sealing process, which comprises the step that workpieces which are bright-dipped and washed are put into the two-in-one trivalent chromium blue white passivation solution for passivation and sealing to be passivated and sealed. By adopting the passivation solution disclosed by the invention to conduct the passivation and sealing treatment, only one working procedure is needed; compared with an old process requiring two working procedures of passivation and then sealing, the cost of the process disclosed by the invention is only 70 to 80 percent of the cost of the old process, so the cost of the passivation and sealing process is remarkably reduced, an obtained passive film has better corrosion resistance and heat resistance, the neutral salt mist resisting time of the passive film can be effectively prolonged, and the economic benefits and the social benefits are good.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment and anticorrosion, and in particular relates to a passivation and sealing two-in-one trivalent chromium blue-white passivation solution and its application process. Background technique [0002] Electro-galvanizing is the most widely used protective coating, and it is usually passivated to improve its corrosion resistance. The traditional hexavalent chromium passivation process is highly toxic. With the increasing awareness of environmental protection, more and more passivation processes for galvanized and zinc alloy products use less toxic trivalent chromium passivation. [0003] At present, in order to obtain a galvanized trivalent chromium blue-white passivation film with better corrosion resistance, a sealant is often applied after passivation water washing to improve its resistance to neutral salt spray. Although the sealing agent is beneficial to prolong the neutral salt spr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34C23C22/46C23C22/53
Inventor 胡明詹益腾何桂明
Owner GUANGZHOU SANFU NEW MATERIALS TECH
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