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Environment-friendly passivation solution and passivation process thereof

A kind of passivation solution, environmental protection technology, applied in the direction of metal material coating process, etc., can solve the problems of no application, environmental pollution, waste of resources, etc., to achieve low cost, good corrosion resistance, black and bright adhesion Effect

Inactive Publication Date: 2020-03-24
上海建立电镀有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the post-treatment of hexavalent chromium passivation is severely restricted and pollutes the environment
The medium-term consumption of hexavalent chromium passivation is very small, only about 5% of the content in the passivation solution, and most of the consumed hexavalent chromium ions are carried out by the workpiece, which does not play a role in application, and the waste of resources is serious

Method used

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  • Environment-friendly passivation solution and passivation process thereof
  • Environment-friendly passivation solution and passivation process thereof
  • Environment-friendly passivation solution and passivation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-7

[0037] Embodiment 1-7: An environment-friendly passivation solution, each component and its corresponding parts by weight are shown in Table 1, wherein the siloxane accelerator is a colloidal solution of polymetasilicate, and the mass fraction is 25% .

[0038] Each component and parts by weight thereof in table 1 embodiment 1-7

[0039]

[0040]

Embodiment 8-14

[0041] Embodiment 8-14: A passivation process of an environment-friendly passivation solution, using the environment-friendly passivation solution in Examples 1-7 as the construction object, combined with figure 1 , the specific passivation process is: grinding → degreasing agent degreasing → hot water washing → drying → passivation → drying.

[0042] Among them, the degreasing agent adopts ordinary commercially available detergent, and the hot water washing temperature is 45°C; when passivating, heat the hot-dip galvanized sheet in an oven at 40°C, take it out and fix it, and passivate the passivation solution with ph=2.5 Transfer to the surface of the hot-dip galvanized sheet, after the coating film is uniform, put it into an oven at 55°C and dry for 60 seconds.

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Abstract

The invention discloses an environment-friendly passivation solution and a passivation process thereof, and relates to the technical field of metal rust prevention. The process is characterized in that the environment-friendly passivation solution is prepared from t following components in parts by weight, 26-34 parts of chromium chloride; 1-5 parts of chromium nitrate; 2-8 parts of phosphoric acid; 15-30 parts of carboxylic acid coordination agent; 1-6 parts of cobalt sulfate; 1-6 parts of nickel sulfate; and 10-20 parts of sodium dihydrogen phosphate. The process is advantaged in that the passivation solution prepared by the formula has advantages of no toxicity, no pollution and good corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of metal antirust, more specifically, it relates to an environment-friendly passivation solution and a passivation process thereof. Background technique [0002] Stainless steel is formed on its surface by a layer of extremely thin, firm and dense stable chromium-rich oxide film (protective film), which prevents the continuous infiltration and oxidation of oxygen atoms, and obtains the ability to resist corrosion. Once this film is subjected to continuous infiltration of oxygen atoms or continuous segregation of iron atoms in the metal for some reason, it is easy to form loose iron oxide, and the metal surface will be continuously corroded. Through chemical treatment, a thin passivation film can be formed on the surface of stainless steel, basically without changing the appearance, size and shape of the substrate. [0003] In the Chinese invention patent with the authorized announcement number CN102912337B,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/08
CPCC23C22/08C23C2222/10C23C2222/20
Inventor 沈建平
Owner 上海建立电镀有限公司