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Passivator for inhibiting trivalent chromium of zinc coating from being oxidized to hexavalent chromium

A technology of trivalent chromium and hexavalent chromium, which is applied in the direction of metal material coating process, etc., can solve the problems of human health and environmental protection.

Active Publication Date: 2017-10-10
广州传福化学技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a trace amount of hexavalent chromium will appear in the passivation layer after the passivation piece treated with the existing trivalent chromium passivation agent is placed for a period of time, and as the standing time prolongs, the hexavalent chromium content will gradually decrease. increase, which is detrimental to human health and environmental protection

Method used

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  • Passivator for inhibiting trivalent chromium of zinc coating from being oxidized to hexavalent chromium
  • Passivator for inhibiting trivalent chromium of zinc coating from being oxidized to hexavalent chromium
  • Passivator for inhibiting trivalent chromium of zinc coating from being oxidized to hexavalent chromium

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Effect test

Embodiment 1

[0042] A kind of passivating agent that inhibits the oxidation of trivalent chromium to hexavalent chromium in the galvanized layer, its raw material composition is as shown in the following table:

[0043] Table 1 A raw material composition table for a passivating agent that inhibits the oxidation of trivalent chromium to hexavalent chromium in the galvanized layer

[0044] raw material

Embodiment 2

[0046] A kind of passivating agent that inhibits the oxidation of trivalent chromium to hexavalent chromium in the galvanized layer, its raw material composition is as shown in the following table:

[0047] Table 2 A kind of raw material composition list of the passivating agent that inhibits the oxidation of galvanized layer trivalent chromium to hexavalent chromium

[0048] raw material

Embodiment 3

[0050] A kind of passivating agent that inhibits the oxidation of trivalent chromium to hexavalent chromium in the galvanized layer, its raw material composition is as shown in the following table:

[0051] Table 3 A kind of raw material composition table of the passivating agent that inhibits the oxidation of galvanized layer trivalent chromium to hexavalent chromium

[0052]

[0053]

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Abstract

The invention discloses a passivator for inhibiting trivalent chromium of a zinc coating from being oxidized to hexavalent chromium. The passivator is composed of the following raw materials of, by mass, 80-100 parts of chromic salt, 10-20 parts of other metal salt, 30-40 parts of an oxidizing agent, 10-20 parts of a film forming accelerant, 10-20 parts of a complexing agent, 1-5 parts of a wetting agent, 1-5 parts of an inhibitor and 200 parts of water. The passivator can effectively inhibit the trivalent chromium in a passivated part from being oxidized to the hexavalent chromium, the passivated part does not generate poisonous harmful hexavalent chromium even though being placed for a long time, and the passivator completely meet the RoHS and regulations of relevant provisions of laws and regulations of China.

Description

technical field [0001] The invention relates to a passivating agent for inhibiting the oxidation of trivalent chromium to hexavalent chromium in a galvanized layer. Background technique [0002] RoHS, the full name of "Restriction on the Use of Certain Hazardous Components in Electrical and Electronic Equipment", was officially implemented on July 1, 2006, with the aim of eliminating lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls and A total of 6 substances of polybrominated diphenyl ethers make electronic and electrical products more beneficial to human health and environmental protection. On February 18, 2006, my country's Ministry of Information Industry took the lead in promulgating corresponding regulations. Since March 1, 2007, it has started to supervise these six kinds of harmful substances in electronic and electrical equipment on the market. [0003] At present, many electronic and electrical equipment on the market need to be electro-galvan...

Claims

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Application Information

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IPC IPC(8): C23C22/68C23C22/53C23C22/34
CPCC23C22/34C23C22/53C23C22/68C23C2222/10
Inventor 黎效传刘信
Owner 广州传福化学技术有限公司
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