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Chromium-free passivation liquid applied to surface of zinc-coated layer

A technology of chromium-free passivation and galvanized layer, applied in the direction of metal material coating process, etc., can solve problems such as biological toxicity, and achieve the effect of simple passivation process

Active Publication Date: 2013-03-20
武汉迪赛新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since Cr 6+ It is fatal to organisms including the human body, is the number one killer of environmental pollution, and is widely restricted internationally

Method used

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  • Chromium-free passivation liquid applied to surface of zinc-coated layer
  • Chromium-free passivation liquid applied to surface of zinc-coated layer
  • Chromium-free passivation liquid applied to surface of zinc-coated layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The mixture of 20g cerium nitrate and ammonium phosphomolybdate (weight ratio is 1: 1.7), 2g phytic acid, 2g ammonium persulfate, 50g aminopropyltriethoxysilane modified nano-silica, 10g vinyltrimethoxy Silane, 10g epoxypropyltriethoxysilane, 50g silicone modified acrylate emulsion, add water to prepare 1 liter of passivation solution, adjust pH to 1 with 6M nitric acid, to obtain light red passivation solution.

[0032] When in use, it is diluted with deionized water according to the ratio (volume ratio passivation solution: water=1:5-10) to obtain the passivation solution working solution.

[0033] Take the galvanized parts out of the electroplating tank, rinse them in 3wt% dilute nitric acid, rinse twice in deionized water, and then put them into the prepared passivation working solution. The passivation time is 20-60s , after leaving the tank, dry it at 100°C for 5-15 minutes. The properties of the passivated galvanized layer are as follows:

[0034]

[0035] U...

Embodiment 2

[0037] 35g mixture of cerium nitrate and ammonium phosphomolybdate (weight ratio is 1:1.9), 4g tartaric acid, 3.5g ammonium persulfate, 40g aminopropyltriethoxysilane modified nano-zirconia, 20g aminopropyltriethoxy Base silane, 5g epoxypropyltriethoxysilane, 40g silicone-modified acrylic emulsion, add water to prepare 1 liter of passivation solution, adjust the pH to 1 with 6M nitric acid, and obtain a light red passivation solution. The using method of passivation solution is the same as embodiment 1. The properties of the passivated galvanized layer are as follows:

[0038] performance item

[0039] (white rust area)

[0040] Use hexavalent chromium passivation solution and trivalent chromium passivation solution to directly passivate the same object as a control.

Embodiment 3

[0042] The mixture of 50g lanthanum nitrate and ammonium phosphomolybdate (weight ratio 1: 2), 5g phytic acid, 4g ammonium persulfate, 30g ureidopropyltrimethoxysilane modified nano-silica and epoxypropyltriethyl The mixture of oxysilane-modified nano-zirconia (weight ratio is 2:1), 25g epoxypropyltriethoxysilane, 30g organic silicon-modified acrylate emulsion, add water to prepare 1 liter, and use 6M nitric acid Adjust the pH to 1 to obtain a light yellow passivation solution. The using method of passivation solution is the same as embodiment 1. The properties of the passivated galvanized layer are as follows:

[0043]

[0044] Use hexavalent chromium passivation solution and trivalent chromium passivation solution to directly passivate the same object as a control.

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Abstract

The invention discloses a chromium-free passivation liquid applied to the surface of a zinc-coated layer, belonging to the technical field of new materials for passivating the surfaces of zinc-coated materials (including zinc-coated steel plates and other zinc-coated parts0. The chromium-free passivation liquid does not contain metal element zirconium and is a chromium-free environmental-friendly passivation liquid which can substitute for hexavalent chromium or trivalent chromium. Each liter of chromium-free passivation liquid comprises 20-100 g of metal element salt, 5-10 g of aqueous silane, 2-10 g of complexing agent, 10-120 g of nano filling material, 1-5 g of oxidizing agent, 5-50 g of film forming aid and the balance of water. In the chromium-free passivation liquid provided by the invention, organic silicon modified acrylate is used as the film forming aid, cerium salt or lanthanum salt and molybdate are used as inorganic components, and the nano filling material and other aids are used as auxiliaries to form the organic and inorganic compound passivation liquid. The passivation effect of the passivation liquid even exceeds that of the hexavalent chromium or trivalent chromium passivation liquid and can totally substitute for the hexavalent chromium or trivalent chromium passivation liquid.

Description

technical field [0001] The invention relates to the technical field of new materials for surface passivation of galvanized materials (including galvanized steel sheets and other galvanized parts), in particular to a chromium-free passivation solution on the surface of a galvanized layer, which does not contain the metal element chromium, It is a chromium-free and environmentally friendly passivation solution that replaces hexavalent chromium or trivalent chromium. Background technique [0002] Galvanizing (including electro-galvanizing and hot-dip galvanizing) is one of the largest number of plating types in all metal surface deposition treatments, and is widely used in every field of the national economy, among which galvanized steel sheets are especially used in the automotive industry, electronic instruments, Support materials in various fields such as home appliances and construction industry. Due to the active chemical properties of the zinc layer itself, with the prol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/40
Inventor 陆飙
Owner 武汉迪赛新材料有限公司
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