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Batch hot-dip galvanizing chromium-free passivator and application method thereof

A chromium-free passivation agent, hot-dip galvanizing technology, applied in the direction of metal material coating process, etc., can solve the problems of high cost, inability to practically apply industrial production, and complex chromium-free passivation process.

Active Publication Date: 2014-09-03
宁波华印表面工程材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a gap between the passivation quality and chromic acid passivation, and some chromium-free passivation processes are complicated and costly, so they cannot be practically applied in industrial production.
In recent years, my country's batch hot-dip galvanizing industry has developed rapidly. Because of the differences between the process and continuous hot-dip galvanizing, there is currently no mature chromium-free passivation product that can be used in the passivation process of batch hot-dip galvanizing. To replace the traditional chromate passivation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Prepare 1L of chromium-free passivation agent for batch hot-dip galvanizing passivation treatment.

[0050] Take benzotriazole 50g, tannic acid 120g, hydroxyethylene diphosphonic acid 100g, EDTA-2 sodium salt 5g, sodium nitrate 5g, hydrogen peroxide 5g, sodium bisulfate 30g, nitric acid 15g, Phosphoric acid 50g, sodium dodecylbenzene sulfonate 5g, and the rest are water, and the above-mentioned components are prepared into a chromium-free passivator. Add 1L of prepared chromium-free passivator to 20L of water at a ratio of 1:20 to make a passivation solution. The passivation solution is at room temperature and has a pH value of 1.6. After the sample is hot-dip galvanized, it is directly immersed in the passivation solution or immersed in the passivation solution after water cooling, and the passivation time is 20s. The passivated samples were air-dried and aged at room temperature for 24 hours. The above-mentioned flow process does not change in any way to the existi...

Embodiment 2

[0053] Prepare 1L of chromium-free passivation agent for batch hot-dip galvanizing passivation treatment.

[0054]Take 10g of diaminotriazole, 10g of tartaric acid, 100g of hydroxyethylidene diphosphonic acid, 140g of phytic acid, 5g of aminotrimethylene phosphonic acid, 15g of sodium nitrate, 15g of sodium chlorate, 15g of nitric acid, 60g of phosphoric acid, nonylphenol Polyoxyethylene ether 5g, all the other are water, and above-mentioned each component is assigned to make chromium-free passivating agent. Add 1L of prepared chromium-free passivator to 20L of water at a ratio of 1:20 to make a passivation solution. The passivation solution is at room temperature and has a pH of 1.8. After the sample is hot-dip galvanized, it is directly immersed in the passivation solution or immersed in the passivation solution after water cooling, and the passivation time is 20s. The passivated samples were air-dried and aged at room temperature for 24 hours. The above-mentioned flow pr...

Embodiment 3

[0057] Prepare 1L of chromium-free passivation agent for batch hot-dip galvanizing passivation treatment.

[0058] Take 50g of dodecyldimethylbenzyl ammonium bromide, 15g of tetraethylammonium bromide, 110g of phytic acid, 80g of hydroxyethylidene diphosphonic acid, 40g of tannic acid, ethylenediaminetetraacetic acid-2 sodium salt 8g, thiourea 6g, sodium chlorate 5g / L, potassium permanganate 5g, nitric acid 20g, sodium bisulfate 40g, phosphoric acid 40g, nonylphenol polyoxyethylene ether 7g, N.N-bishydroxyethyl alkylamide 6g, The rest is water; the above-mentioned components are prepared into a chromium-free passivation agent. Add 1L of prepared chromium-free passivator to 20L of water at a ratio of 1:20 to make a passivation solution. The passivation solution is at room temperature and has a pH value of 1.6. After the sample is hot-dip galvanized, it is directly immersed in the passivation solution or immersed in the passivation solution after water cooling, and the passiva...

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Abstract

The invention discloses a batch hot-dip galvanizing chromium-free passivator and an application method thereof. According to the invention, toxic and harmful hexavalent chromium and trivalent chromium used in a traditional passivation process are replaced with an organic film-former, so that a chromium-free passivator which does not contain chromates, can be used at room temperature, is low in cost, good in corrosion resistance and easy to use, and can be practically applied to industrial production is provided for passivation treatment in the batch hot-dip galvanizing industry. The chromium-free passivator mainly comprises an organic film-former, an organic corrosion inhibitor, an oxidant, a surfactant and water. The chromium-free passivator disclosed by the invention is easy to use and simple in operation, and has no change in existing processes.

Description

technical field [0001] The invention relates to a chromium-free passivator for batch hot-dip galvanizing and a method for using the same, belonging to the technical field of metal surface treatment. Background technique [0002] Hot-dip galvanizing has been widely used as an effective method for steel to prevent atmospheric corrosion. Compared with other metal anti-corrosion methods, the combination of physical barrier protection and electrochemical protection of hot-dip galvanized coatings, compactness, durability, maintenance-free, economical, and the impact of hot-dip galvanizing on the shape and shape of steel parts The adaptability of size and high efficiency of production capacity have irreplaceable advantages. [0003] In addition to continuous hot-dip galvanized products such as galvanized steel sheets, steel pipes and iron wires being widely used in the automotive industry, construction industry and daily civilian products, batch hot-dip galvanized products are als...

Claims

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Application Information

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IPC IPC(8): C23C22/07C23C22/53
Inventor 钱宏彬
Owner 宁波华印表面工程材料科技有限公司
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