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A kind of chromium-free passivating agent for magnesium-plated plate and preparation method thereof

A chromium-free passivator and magnesium-plating technology, which is applied in the direction of metal material coating process, etc., can solve the problems of high cost, trivalent chromium toxicity, difficulty in wastewater treatment of trivalent chromium ions, etc., and achieve the effect of avoiding damage.

Active Publication Date: 2017-01-18
WUXI EPIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, many factories use trivalent chromate to replace hexavalent chromate to prepare steel surface passivation agent, such as Chinese patent CN103741129A galvanized layer trivalent chromium high corrosion resistance blue-white passivator, although trivalent chromate passivation Chemical treatment of the workpiece surface has a good effect, but trivalent chromium still has a certain degree of toxicity, it is difficult for the factory to treat the wastewater of trivalent chromium ions, and the cost is high

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  • A kind of chromium-free passivating agent for magnesium-plated plate and preparation method thereof

Examples

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Embodiment 1

[0021] A chromium-free passivating agent for magnesium-plated boards, prepared according to the proportions of the following raw materials by weight: 12 parts of phosphoric acid, 8 parts of formic acid, 5 parts of zirconium sulfate, 6 parts of sodium acetate, 8 parts of sodium phosphate, 2 parts of polyurethane, 1 part of diamine, 3 parts of sodium molybdate, 1 part of tannic acid, 35 parts of water.

[0022] A preparation method for a chromium-free passivating agent for a magnesium-plated plate, comprising the following steps:

[0023] (1) Pour phosphoric acid, formic acid, zirconium sulfate, sodium acetate, sodium phosphate and water into the reaction kettle, stir for 25 minutes at a temperature of 15°C and a pressure of 0.06MPa, and the stirrer speed is 400 rpm, stirring Adjust the pH to 4 after completion;

[0024] (2) Sodium molybdate and tannic acid were added to water, and dissolved under magnetic stirring at a temperature of 48°C and a pressure of 0.12MPa, and the tem...

Embodiment 2

[0028] A chrome-free passivator for magnesium-plated boards, prepared according to the following raw material ratios by weight: 15 parts of phosphoric acid, 10 parts of formic acid, 8 parts of zirconium sulfate, 9 parts of sodium acetate, 11 parts of sodium phosphate, 4 parts of polyurethane, 3 parts of diamine, 5 parts of sodium molybdate, 3 parts of tannic acid, 40 parts of water.

[0029] A preparation method for a chromium-free passivating agent for a magnesium-plated plate, comprising the following steps:

[0030] (1) Pour phosphoric acid, formic acid, zirconium sulfate, sodium acetate, sodium phosphate and water into the reaction kettle, stir for 28 minutes at a temperature of 17°C and a pressure of 0.07MPa, the stirrer speed is 450 rpm, stir Adjust the pH to 4 after completion;

[0031] (2) Sodium molybdate and tannic acid were added to water, and dissolved under magnetic stirring at a temperature of 50°C and a pressure of 0.15MPa, and the temperature of the solution w...

Embodiment 3

[0035] A chrome-free passivator for magnesium-plated boards, prepared according to the proportions of the following raw materials by weight: 20 parts of phosphoric acid, 14 parts of formic acid, 11 parts of zirconium sulfate, 11 parts of sodium acetate, 14 parts of sodium phosphate, 6 parts of polyurethane, 4 parts of diamine, 6 parts of sodium molybdate, 4 parts of tannic acid, 45 parts of water.

[0036] A preparation method for a chromium-free passivating agent for a magnesium-plated plate, comprising the following steps:

[0037] (1) Pour phosphoric acid, formic acid, zirconium sulfate, sodium acetate, sodium phosphate and water into the reaction kettle, stir for 30 minutes at a temperature of 19°C and a pressure of 0.08MPa, and the stirrer speed is 500 rpm, stirring Adjust the pH to 5 after completion;

[0038] (2) Sodium molybdate and tannic acid were added to water, and dissolved under magnetic stirring at a temperature of 52°C and a pressure of 0.18MPa, and the temper...

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Abstract

The invention discloses a chromium-free passivant of a magnesium-plated plate and a preparation method of the chromium-free passivant. The chromium-free passivant of the magnesium-plated plate is prepared from the following raw materials in parts by weight: 12-30 parts of phosphoric acid, 8-25 parts of formic acid, 5-16 parts of zirconium sulfate, 6-22 parts of sodium acetate, 8-23 parts of sodium phosphate, 2-11 parts of polyurethane, 1-9 parts of ethylenediamine, 3-12 parts of sodium molybdate, 1-8 parts of tannic acid and 35-60 parts of water. The chromium-free passivant of the magnesium-plated plate disclosed by the invention can be used for passivating at the normal temperature, is short in passivating time, environmentally friendly and pollution-free. And the corrosion resistance of the magnesium-plated plate is strengthened by the formed passivated film.

Description

technical field [0001] The invention relates to a passivating agent, in particular to a chromium-free passivating agent for magnesium-plated plates and a preparation method thereof. Background technique [0002] Magnesium is an active metal element that can react with acid and is easily oxidized. Therefore, when the surface of the workpiece is magnesium, it is necessary to passivate the surface of the magnesium. At present, hexavalent chromate passivation has been used in our country. The hexavalent chromate passivation treatment significantly improves the corrosion resistance of the alloy. Salt passivation solution contains hexavalent chromium, a highly toxic carcinogen, which seriously affects human health and pollutes the environment. At present, countries all over the world have begun to restrict or ban the use of chromate treatment methods. Therefore, there is an urgent need to develop a non-toxic, environmentally friendly, high-efficiency, and low-consumption hexaval...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/42
CPCC23C22/42
Inventor 尤为
Owner WUXI EPIC TECH