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A chrome-free passivator for hot-dip galvanizing

A chrome-free passivator and hot-dip galvanizing technology, which is applied in the coating process of metal materials, can solve the problems of environmental and human impact, toxicity and harm, and achieve the effects of fast drying speed, good stability and excellent weather resistance

Active Publication Date: 2021-11-16
镇江市昌辉新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, the chromate passivation solution used contains toxic and harmful hexavalent chromium and trivalent chromium elements, which have a bad influence on the environment and the human body.

Method used

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  • A chrome-free passivator for hot-dip galvanizing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A chromium-free passivator for hot-dip galvanizing, comprising the following raw materials in parts by weight: 7kg of acetic acid, 6kg of oxalic acid, 9kg of phytic acid, 6kg of phosphoric acid, 7kg of nitric acid and 6kg of silica sol;

[0023] The using method of described hot-dip galvanizing chromium-free passivating agent is:

[0024] (1) mixing and stirring each raw material contained in the chromium-free passivating agent for hot-dip galvanizing to obtain the chromium-free passivating agent for hot-dip galvanizing;

[0025] (2) Add water to the chromium-free passivating agent for hot-dip galvanizing, and mix and stir evenly to obtain a passivating solution;

[0026] (3) Immerse the galvanized workpiece to be passivated in the passivation solution for passivation. After the passivation is completed, take out the galvanized workpiece and let it dry.

Embodiment 2

[0028] A chromium-free passivator for hot-dip galvanizing, comprising the following raw materials in parts by weight: 5 kg of acetic acid, 3 kg of oxalic acid, 8 kg of phytic acid, 3 kg of phosphoric acid, 3 kg of nitric acid and 3 kg of silica sol;

[0029] The using method of described hot-dip galvanizing chromium-free passivating agent is:

[0030] (1) Stir each raw material contained in the hot-dip galvanizing chromium-free passivating agent under the stirring condition of 50r / min for 10min, mix and stir evenly, and obtain the hot-dip galvanizing chromium-free passivating agent;

[0031] (2) Add demineralized water to the hot-dip galvanized chromium-free passivator, and the weight ratio of the added demineralized water to the passivator is 18:1 (adding demineralized water can prevent calcium and magnesium ions in the water from interacting with the passivator The raw materials in the reaction will affect the passivation effect of the passivating agent), and mix and stir ev...

Embodiment 3

[0034] A chromium-free passivator for hot-dip galvanizing, comprising the following raw materials in parts by weight: 8 kg of acetic acid, 5 kg of oxalic acid, 10 kg of phytic acid, 5 kg of phosphoric acid, 5 kg of nitric acid and 5 kg of silica sol;

[0035] The using method of described hot-dip galvanizing chromium-free passivating agent is:

[0036] (1) Stir each raw material contained in the chromium-free passivator for hot-dip galvanizing under the stirring condition of stirring speed 55r / min for 15min, mix and stir evenly, and obtain the chromium-free passivator for hot-dip galvanizing;

[0037] (2) Add demineralized water to the hot-dip galvanized chromium-free passivator, and the weight ratio of the added demineralized water to the passivator is 20:1 (adding demineralized water can prevent calcium and magnesium ions in the water from interacting with the passivator The raw materials in the reaction will affect the passivation effect of the passivating agent), and mix a...

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Abstract

The invention discloses a chromium-free passivating agent for hot-dip galvanizing and a using method thereof. The chromium-free passivating agent for hot-dip galvanizing includes the following raw materials: acetic acid, oxalic acid, phytic acid, phosphoric acid, nitric acid and silica sol; The method is as follows: mix and stir the raw materials contained in the hot-dip galvanized chromium-free passivator to obtain the hot-dip galvanized chromium-free passivator; add water to the hot-dip galvanized chromium-free passivator, and mix and stir evenly to obtain the Chemical solution; immerse the galvanized workpiece to be passivated in the passivation solution and passivate it. The beneficial effects of the present invention are: the passivating agent of the present invention does not contain toxic and harmful substances, has good stability, fast drying speed, excellent passivation effect, process adaptability, and the formed passivation film is colorless and transparent and has good resistance Corrosion and excellent weather resistance, can be reused when used, that is, the passivation solution is stored in the passivation tank, the workpiece to be passivated is inserted into the passivation solution, and the passivation solution can be added to the passivation tank to reuse passivation Liquid, no pollutant discharge, simple process, easy to use.

Description

technical field [0001] The invention relates to the technical field of metal surface passivators, in particular to a chromium-free passivator for hot-dip galvanizing and a use method thereof. Background technique [0002] Passivating agents play a very important role in the corrosion protection of galvanized workpieces. Since zinc is an anodic coating for steel products, when corrosion occurs, the coating will corrode preferentially. Since zinc is an active metal with a relatively negative potential, it is easy to oxidize itself. When it is used as a coating, it will accelerate the corrosion rate when it is used with a metal with a positive potential. If zinc is corroded, it will not be able to protect the substrate. This is if Passivating it to change the surface potential will greatly improve the corrosion resistance of the surface and enhance the protective effect of the coating on the substrate. Therefore, all galvanized layers basically have to undergo various passivat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/53
CPCC23C22/53
Inventor 李欣
Owner 镇江市昌辉新材料有限公司
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