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Chromium-free passivator and preparation method thereof

A chromium-free passivator and phosphate technology, applied in the coating process of metal materials, etc., can solve the problems of reduced corrosion resistance and improvement of corrosion resistance, and achieve good corrosion resistance, no pollution to the environment, and simple ingredients Effect

Inactive Publication Date: 2015-02-25
WUXI EPIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the metal body is protected, the corrosion resistance needs to be improved, and the corrosion resistance is reduced at high temperature, so it is necessary to develop a passivator with simple components and corrosion resistance

Method used

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  • Chromium-free passivator and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0028] A chromium-free passivator, comprising the following raw materials in parts by weight: 1 part of ethanolamine, 0.6 part of ethylenediamine, 25 parts of zinc phosphate, 1 part of nickel salt, 10 parts of nitrate, 1-5 parts of citric acid, 600 mesh 1-5 parts of ceramic powder, 2 parts of phenolic epoxy resin, 20 parts of water.

[0029] The preparation method of above-mentioned chromium-free passivating agent comprises the following steps:

[0030] Step 1, taking raw materials by weight;

[0031] Step 2, after mixing ethanolamine, ethylenediamine, phosphate, nickel salt, phosphate and water, stir at 150rpm for 15 minutes to obtain the first mixture;

[0032] Step 3, heating the first mixture to 55°C, adding citric acid and ceramic powder, stirring at 50rpm for 1 minute, then adding novolac epoxy resin, stirring and raising the temperature to 85°C, and keeping it warm for 3 minutes to obtain the second mixture;

[0033] In step 4, the second mixture was vacuum-concentrat...

Embodiment 2

[0036] A chromium-free passivator, comprising the following raw materials in parts by weight: 1-3 parts of ethanolamine, 0.6-0.9 parts of ethylenediamine, 2-4 parts of nickel salt, 30-40 parts of trisodium phosphate, 12-18 parts of phosphate 2-4 parts of citric acid, 2-4 parts of 700 mesh ceramic powder, 3-5 parts of phenolic epoxy resin, and 25-30 parts of water.

[0037] The preparation method of above-mentioned chromium-free passivating agent comprises the following steps:

[0038] Step 1, taking raw materials by weight;

[0039] Step 2, after mixing ethanolamine, ethylenediamine, phosphate, nickel salt, phosphate and water, stir at 175rpm for 18 minutes to obtain the first mixture;

[0040] Step 3, heating the first mixture to 60°C, adding citric acid and ceramic powder, stirring at 65rpm for 3 minutes, then adding novolak epoxy resin, stirring and raising the temperature to 88°C, and keeping it warm for 5 minutes to obtain the second mixture;

[0041] In step 4, the sec...

Embodiment 3

[0044] A chromium-free passivating agent comprising the following raw materials in parts by weight: 3 parts of ethanolamine, 0.9 part of ethylenediamine, 4 parts of nickel salt, 40 parts of zinc phosphate, 18 parts of phosphate, 4 parts of citric acid, and 680 mesh ceramic powder 4 parts, 5 parts of novolac epoxy resin, 30 parts of water.

[0045] The preparation method of above-mentioned chromium-free passivating agent comprises the following steps:

[0046] Step 1, taking raw materials by weight;

[0047] Step 2, after mixing ethanolamine, ethylenediamine, phosphate, nickel salt, phosphate and water, stir at 180rpm for 22 minutes to obtain the first mixture;

[0048] Step 3, heating the first mixture to 72°C, adding citric acid and ceramic powder, stirring at 72rpm for 4 minutes, then adding novolac epoxy resin, stirring and raising the temperature to 90°C, and keeping it warm for 6 minutes to obtain the second mixture;

[0049] In step 4, the second mixture was vacuum-con...

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Abstract

The invention discloses a chromium-free passivator and a preparation method thereof. The passivator is prepared from ethanolamine, ethylenediamine, phosphate, nickel salt, nitrate, citric acid, ceramic powder, a novolac epoxy resin and water. The preparation method comprises the following steps: weighing the raw materials in parts by weight; mixing the ethanolamine, ethylenediamine, phosphate, nickel salt, phosphate and water, and stirring for 15-25 minutes to obtain a first mixture; heating the first mixture to 55-78 DEG C, adding the citric acid and ceramic powder, stirring for 1-5 minutes, adding the novolac epoxy resin, stirring, heating to 85-95 DEG C, and keeping the temperature for 3-7 minutes to obtain a second mixture; and carrying out vacuum concentration on the second mixture for 1-3 minutes to obtain the chromium-free passivator. The passivator has the advantages of high temperature resistance, high corrosion resistance and low cost.

Description

[0001] technical field [0002] The invention relates to the field of passivating agents, in particular to a chromium-free passivating agent and a preparation method thereof. [0003] Background technique [0004] Nickel plating is widely used in modern electroplating processes, but the surface of the nickel layer, especially the chemical nickel layer, has large pores, which is prone to potential corrosion and oxidative discoloration, and often has poor salt spray resistance, so passivation treatment is often required. What is commonly used in the prior art is a hexavalent chromium passivator. However, the passivation effect of hexavalent chromium-type passivators varies greatly with the content of hexavalent chromium, and the passivation effect is not stable at the same time. Usually, the salt spray resistance time after passivation with hexavalent chromium is 24-48 hours, which is difficult Longer salt spray test time. At the same time, since hexavalent chromium compoun...

Claims

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Application Information

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IPC IPC(8): C23C22/07
CPCC23C22/08C23C22/17
Inventor 尤为
Owner WUXI EPIC TECH