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Environment-friendly silicate passivation solution for galvanization, and preparation method and application thereof

An environmentally friendly, silicate technology, which is applied in the coating process of metal materials, can solve the problems of human body and environmental damage, hexavalent chromium is highly toxic, etc., and achieve high passivation efficiency, good anti-white rust performance, The preparation process and the effect of simple operation

Active Publication Date: 2014-07-09
SHANGHAI YONGFENG HOT DIP GALVANIZING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hexavalent chromium is highly toxic and has great harm to the human body and the environment. It has been banned by the European Union.

Method used

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  • Environment-friendly silicate passivation solution for galvanization, and preparation method and application thereof
  • Environment-friendly silicate passivation solution for galvanization, and preparation method and application thereof
  • Environment-friendly silicate passivation solution for galvanization, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The conventional process of hot-dip galvanizing of steel plates is as follows: degreasing in hot alkaline bath → hot water rinsing → pickling and rust removal → cold water rinsing → plating flux aid → drying → hot dip galvanizing → water cooling.

[0031] Silicate solution and treatment process:

[0032] After the steel workpiece is galvanized, the workpiece is placed in the environmentally friendly galvanized silicate passivation solution for 1 minute by constant temperature dipping method, then taken out, and dried naturally at a passivation temperature of 60°C; the composition of the silicate passivation solution is Sodium hydroxide is 14g / L, silicon dioxide is 30g / L, silica sol is 17ml / L, the pH value of the passivation solution is 10.5, and the rest is water.

[0033] The specific method of silicate passivation solution configuration is:

[0034] (1) In a 1000mL beaker, dissolve 14g of sodium hydroxide with 100mL of distilled water and stir until the sodium hydrox...

Embodiment 2

[0048] Hot-dip galvanizing of steel plates, the process is as follows: degreasing in hot alkaline bath → hot water washing → pickling and rust removal → cold water washing → plating flux aid → drying → hot dipping → water cooling.

[0049] Silicate solution and treatment process:

[0050] After the steel workpiece is galvanized, the workpiece is placed in the silicate passivation solution for 1 minute by constant temperature dipping, then taken out, and dried naturally at a passivation temperature of 60°C; the composition of the silicate passivation solution includes sodium hydroxide 20g / L, silicon dioxide 30g / L, silica sol 70ml / L, and the pH value of the passivation solution is 10.0.

[0051] The specific method of silicate passivation solution configuration is:

[0052] (1) In a 1000mL beaker, dissolve 20g of sodium hydroxide with 100mL of distilled water and stir until the sodium hydroxide is completely dissolved;

[0053] (2) Slowly add 30g of silicon dioxide, and stir ...

Embodiment 3

[0060] Hot-dip galvanizing of steel plates, the process is as follows: degreasing in hot alkaline bath → hot water washing → pickling and rust removal → cold water washing → plating flux aid → drying → hot dipping → water cooling.

[0061] Silicate solution and treatment process:

[0062] After the steel workpiece is galvanized, the workpiece is placed in the silicate passivation solution for 3 minutes by constant temperature dipping, then taken out, and dried naturally at a passivation temperature of 40°C; the composition of the silicate passivation solution includes sodium hydroxide 20g / L, silicon dioxide 30g / L, silica sol 70ml / L, and the pH value of the passivation solution is 10.0.

[0063] The specific method of silicate passivation solution configuration is:

[0064] (1) In a 1000mL beaker, dissolve 20g of sodium hydroxide with 100mL of distilled water and stir until the sodium hydroxide is completely dissolved;

[0065] (2) Slowly add 30g of silicon dioxide, and stir...

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Abstract

The invention discloses an environment-friendly silicate passivation solution for galvanization, and a preparation method and an application thereof. Raw materials of the silicate passivation solution comprise 1-20 g / L of sodium hydroxide, 5-50 g / L of silicon dioxide, 20-160 mL / L of silica sol, and the balance being water. A pH value of the passivation solution is 7.0-12.0. When the passivation solution is in use, after a steel workpiece is galvanized, the workpiece is put in the environment-friendly silicate passivation solution for galvanization by adopting a constant temperature impregnation; the workpiece is taken out after 0.5-5 min; and the workpiece is processed at a temperature of 20-80 DEG C to form a silicate protective film for a high-corrosion galvanized layer. The obtained film by passivated by the passivation solution has good adhesion with the galvanized layer, is dense, colorless and transparent, and has good white rust-prevention performance. The passivation solution takes silicate to replace chromium salt as a main raw material, and overcomes the disadvantages of high toxicity and carcinogenesis of a conventional chromium salt passivation process.

Description

technical field [0001] The invention relates to an environment-friendly galvanized silicate passivation solution and a preparation method thereof, which is mainly used to provide a new type of pollution-free passivation solution product and its preparation method, which can carry out surface anticorrosion treatment on galvanized products. The invention belongs to the technical field of metal material surface treatment. Background technique [0002] Galvanizing steel is one of the effective methods to improve the atmospheric corrosion resistance of steel, and it is widely used in many fields such as construction, machinery, and automobiles. However, galvanized parts are prone to corrosion and white rust in a humid environment, which affects their appearance and corrosion resistance. In order to solve this problem, a post-passivation treatment is usually performed on the galvanized parts. [0003] Chromate passivation is widely used and adopted because of its strong corrosio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/60
Inventor 孔纲张双红车淳山卢锦堂汤鹏
Owner SHANGHAI YONGFENG HOT DIP GALVANIZING
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