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Metasilicate cleaning inactivating process

A silicate, clean technology, applied in the direction of metal material coating process, can solve the problems of high cost, can not achieve chromate passivation corrosion resistance, etc., to overcome high toxicity, achieve clean production, production costs low effect

Inactive Publication Date: 2008-03-05
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the chromium-free passivation on galvanized and its alloy layers at home and abroad mainly includes molybdate passivation, rare earth metal passivation, silicate passivation, phytic acid passivation and organic passivation, etc., but these chromium-free passivation The passivation effect of the technology is not as good as the corrosion resistance of chromate passivation, or the cost is too high, so that there is no chromium-free passivation process to completely replace the chromate passivation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: The passivation process is used for subsequent passivation treatment on partially galvanized steel sheets.

[0015] Before electroplating, the steel plate is subjected to pretreatments such as rust removal, degreasing, activation, etc., and then placed in the electroplating bath for electroplating. The bath composition and operating conditions of the galvanizing process are: ZnCl 2 80g / L, KCl200g / L, appropriate amount of additives, the pH value of the plating solution is maintained at about 5.5, and the current density is 1.2A / dm 2 , the temperature is room temperature, and the plating time is 25 minutes.

[0016] Formulated by HNO 3 2ml / L and H 2 Light-emitting solution composed of O, and sodium silicate 5g / L, boric acid 2g / L, H 2 o 2 5ml / L, HNO 3 3ml / L, H 2 SO 4 3ml / L and H 2 Passivation solution composed of O, with dilute H 2 SO 4 Or dilute NaOH solution to adjust the pH value of the passivation solution to 3, then take out the plated steel pl...

Embodiment 2

[0018] Embodiment 2: The passivation process is used for the passivation treatment after the overall electroplating of Zn-Fe alloy on a certain steel pipe on the air compressor.

[0019] Before passivation, the steel pipe is electroplated after pretreatment (rust removal, degreasing, activation). The composition and operating conditions of the zinc-iron alloy electroplating process are: ZnCl 2 100g / L, KCl230g / L, FeSO 4 ·7H 2 O10g / L, ascorbic acid 1.2g / L, appropriate amount of additives, pH value 4.0, cathode current density 1.8A / dm 2 1. The temperature is room temperature, the electroplating time is 40 minutes, and the iron content in the obtained Zn-Fe alloy coating is 0.5%.

[0020] Formulated by HNO 3 3ml / L and H 2 Light-emitting solution composed of O, and potassium silicate 10g / L, boric acid 4g / L, H 2 OX10ml / L, HNO 3 10ml / L, H 2 SO 4 10ml / L and H 2 Passivation solution composed of O, with dilute H 2 SO 4 Or dilute NaOH solution to adjust the pH value of the pas...

Embodiment 3

[0022]Embodiment 3: The passivation process is used for the passivation treatment after the overall galvanizing of the steel casing of a certain machine.

[0023] Before passivation, the steel casing of a certain machine is subjected to electroplating after pretreatment (rust removal, degreasing, activation). The composition and operating conditions of the galvanizing process are: ZnCl 2 90g / L, KCl220g / L, appropriate amount of additives, pH value 5.0, cathode current density 1.5A / dm 2 , The temperature is room temperature, and the electroplating time is 30 minutes.

[0024] Formulated by HNO 3 5ml / L and H 2 The light-emitting liquid composed of O, and sodium silicate 20g / L, boric acid 6g / L, H 2 o 2 20ml / L, HNO 3 15ml / L, H 2 SO 4 15ml / L and H 2 Passivation solution composed of O, with dilute H 2 SO 4 Or dilute NaOH solution to adjust the pH value of the passivation solution to 1.5, then take out the electroplated steel casing of a certain machine, put it into the ligh...

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PUM

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Abstract

The present invention is clean silicate deactivating process for the post-treatment of steel part after plating zinc or ferrozinc alloy electrically, and belongs to the field of metal material surface treating technology. The process includes compounding brightening liquid comprising HNO3 and H2O and deactivating liquid comprising sodium or potassium silicate, boric acid, H2O2, HNO3, H2SO4 and H2O in the pH 1.5-3; washing steel part after plating zinc or ferrozinc alloy electrically; brightening treatment in the brightening liquid and water washing; deactivating in the deactivating liquid at room temperature and water washing; and blowing to dry. The process can raise the corrosion resistance of the steel part obviously and is environment friendly.

Description

technical field [0001] The invention relates to a silicate cleaning and passivation process, which is mainly used in the post-treatment process of electrogalvanizing or zinc-iron alloy for iron and steel parts, and belongs to the technical field of surface treatment of iron and steel materials. technical background [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] Galvanizing and zinc-iron alloys are effective ways to improve the corrosion resistance of steel parts, and are widely used in many fields such as shipbuilding industry, machinery industry, aviation, and construction. However, in a humid environment, especially in a hot and humid environment, the galvanized and zinc-iron alloy layers are prone to corrosion, causing the surface of the coating to form a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/53C23C22/78
Inventor 张英杰范云鹰闫磊章江洪
Owner KUNMING UNIV OF SCI & TECH
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