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Clean galvanized part silicate colorful passivating process

A silicate and clean technology, applied in the coating process of metal materials, etc., can solve the problems of high cost, low cost, poor brightness and corrosion resistance, etc., and achieve improved corrosion resistance, easy cost and efficiency, and corrosion resistance excellent corrosion resistance

Inactive Publication Date: 2010-09-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phytic acid and organic passivation have good environmental protection and no heavy metal ion treatment problem, but the brightness and corrosion resistance are poor, the cost is high, and maintenance is difficult
Silicate passivation is clean and environmentally friendly, has good corrosion resistance, low cost, and high efficiency. It is the most promising chromium-free passivation technology. Meet the requirements for color passivation of galvanized parts

Method used

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  • Clean galvanized part silicate colorful passivating process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: The passivation process is used for the passivation treatment of acid electrogalvanized steel sheet.

[0025] The 80mm×40mm×1.5mm low-carbon steel plate is put into the electroplating solution for electroplating after pre-treatment such as rust removal, degreasing and activation before electroplating. The composition and operating conditions of the galvanizing process are: ZnCl 2 50g / L, KCl200g / L, Chloride Zinc No. 1 Additive 12mL / L, Chloride Zinc No. 2 Additive 5mL / L, the pH value of the plating solution is kept at about 6.0, and the current density is 1.0A / dm 2, the temperature is room temperature, and the plating time is 25 minutes.

[0026] Preparation of light solution: by HNO 3 (65%) 10mL / L and H 2 composed of O;

[0027] Preparation of passivation solution: raw materials are sodium silicate 5g / L, boric acid 2g / L, H 2 o 2 (30%) 25mL / L, HNO 3 (65%) 3mL / L, H 2 SO 4 (98%)5mL / L, KMnO 4 0.3g / L, NaAc 2g / L and H 2 O composition; the preparation ...

Embodiment 2

[0030] Embodiment 2: The passivation process is used for passivation treatment of hot-dip galvanized steel sheets.

[0031] The 100mm×60mm×2mm Q235 steel plate is subjected to pre-treatments such as rust removal, degreasing, and galvanizing before hot-dip galvanizing, and then hot-dip galvanized in a graphite crucible filled with zinc liquid. The galvanizing temperature is 450°C. The dipping time is 1 minute, and water cooling is carried out after the zinc layer is solidified.

[0032] Preparation of light solution: by HNO 3 (65%) 15mL / L and H 2 O forms the light-emitting liquid;

[0033] Preparation of passivation solution: raw materials are sodium silicate 10g / L, boric acid 3g / L, H 2 o 2 (30%) 30mL / L, HNO 3 (65%) 4mL / L, H 2 SO 4 (98%) 4mL / L, KMnO 4 0.5g / L, NaAc 1g / L and H 2 O composition, preparation method is the same as embodiment 1, with dilute H 2 SO 4 Or dilute NaOH solution to adjust the pH value of the passivation solution to 0.8.

[0034] Immerse the hot...

Embodiment 3

[0036] Embodiment 3: This passivation process is used for the passivation treatment after alkaline electrogalvanizing of a certain machine steel shell.

[0037] Before passivation, the steel shell of a certain machine is electroplated after pretreatment (rust removal, oil removal, weak etching, pre-dipping, etc.), and the composition and operating conditions of the galvanizing process are: ZnO 10g / L , NaOH 120g / L, DPE-1 additive 5mL / L, current density 2.5A / dm 2 , The temperature is room temperature, and the electroplating time is 30 minutes.

[0038] Preparation of light solution: by HNO 3 (65%) 5mL / L and H 2 O forms the light-emitting liquid;

[0039] Preparation of passivation solution: raw materials are sodium silicate 8g / L, boric acid 2g / L, H 2 o 2 (30%) 20mL / L, HNO 3 (65%) 5mL / L, H 2 SO 4 (98%) 3mL / L, KMnO 4 0.2g / L, NaAc 3g / L and H 2 O composition, preparation method is the same as embodiment 1, with dilute H 2 SO 4 Or dilute NaOH solution to adjust the pH va...

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Abstract

The invention relates to a clean galvanized part silicate colorful passivating process, which is used for a post treatment process of electro-galvanization and hot galvanization for steel parts. The process comprises the following steps: a steel part is cleaned by water after electro-galvanization and hot galvanization, is immersed in light-emitting solution for light-emitting treatment for 3 to 5seconds, is taken out and cleaned with water, is immersed in passivation solution and passivated at room temperature for 5 to 30 seconds, is taken out to be cleaned with water and dried. The light-emitting solution comprises 5 to 15mL / L of 65 percent HNO3, and the balance being H2O; the passivation solution comprises the following compositions: 3 to 10g / L of sodium silicate, 1 to 3g / L of boric acid, 20 to 30mL / L of 30 percent H2O2, 3 to 5mL / L of 65 percent HNO3, 3 to 5mL / L of 98 percent H2SO4, 0.1 to 0.5g / L of KMnO4, 1 to 3g / L of NaAc, and the balance being H2O; wherein the pH value of the passivation solution is controlled between 0.5 and 1.0. The galvanized parts after the treatment of the passivation process has colorful appearance and excellent corrosion resistance, the rusting time of a neutral salt spray test on the parts reaches 80 to 120 hours, and the parts are clean and environment friendly.

Description

technical field [0001] The invention relates to the technical field of surface treatment of iron and steel materials, in particular to a silicate color passivation process for clean galvanized parts. Background technique [0002] Corrosion and anti-corrosion are related to economic development and people's life safety. Surface engineering technology is the most economical and effective means and method to solve the corrosion and protection of mechanical parts and materials. [0003] Electro-galvanizing and hot-dip galvanizing are effective ways to improve the corrosion resistance of steel parts, and are currently widely used in many fields such as construction, transportation, machinery, electronics, and aviation. However, in a humid environment, especially in a hot and humid environment, the galvanized layer is prone to corrosion, causing the surface of the coating to form a dark gray or white loose corrosion product - white rust; after a long time, red rust will appear, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/53
Inventor 范云鹰陈冬华刘晓晶李鹏鲁文良
Owner KUNMING UNIV OF SCI & TECH
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