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Tin coating passivator

A passivating agent and tin plating technology, applied in the direction of metal material coating process, etc., can solve the problems of health hazards, harm, pollution of the environment, etc., and achieve the effect of prolonging the service life, slowing down the corrosion rate, and improving the corrosion resistance.

Inactive Publication Date: 2015-03-25
TIANCHANG FEILONG BRAND STEEL GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since hexavalent chromium is a heavy metal, it has strong toxicity and seriously pollutes the environment. Long-term exposure can cause symptoms such as headache, coma, rhinitis, nasal perforation, skin ulcers, and various cancers, which is extremely harmful to human health. , especially for tinplate used in the food and beverage industry, the harm to the human body caused by chromate passivation cannot be ignored

Method used

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Examples

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Effect test

Embodiment 1

[0014] A kind of tin coating passivator proposed by the present invention, its raw material comprises by weight: 50 parts of trisodium phosphate, 5 parts of sodium tartrate, 2 parts of sodium molybdate, 5 parts of sodium citrate, 5 parts of cobalt sulfate, phytic acid N , 1 part of N'-di-sec-butyl-p-phenylenediamine.

Embodiment 2

[0016] A kind of passivator for tin plating layer proposed by the present invention, its raw material comprises by weight: 70 parts of trisodium phosphate, 2 parts of sodium tartrate, 5 parts of sodium molybdate, 2 parts of sodium citrate, 10 parts of cobalt sulfate, phytic acid N , 3 parts of N'-di-sec-butyl-p-phenylenediamine.

Embodiment 3

[0018] A kind of passivator for tin plating layer proposed by the present invention, its raw material comprises by weight: 60 parts of trisodium phosphate, 3.5 parts of sodium tartrate, 3.5 parts of sodium molybdate, 3.5 parts of sodium citrate, 8 parts of cobalt sulfate, phytic acid N , 2 parts of N'-di-sec-butyl-p-phenylenediamine.

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PUM

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Abstract

The invention discloses a tin coating passivator which comprises the following raw materials in parts by weight: 50-70 parts of trisodium phosphate, 2-5 parts of sodium tartrate, 2-5 parts of sodium molybdate, 2-5 parts of sodium citrate, 5-10 parts of cobaltous sulfate, 15-25 parts of phytic acid, 5-10 parts of oxalic acid, 10-20 parts of octadecylamine, 2-5 parts of nonylphenol polyoxyethylene ether, 4-7 parts of Tween-20, 5-10 parts of triethanolamine, 2-6 parts of 2,6-di-tert-butyl-4-methylphenol and 1-3 parts of N,N'-bis(1-methylpropyl)-1,4-phenylenediamine. The tin coating passivator provided by the invention does not contain high-valence chromium, does not cause environmental pollution or generate harm to a human body and has the advantages of corrosion resistance and oxidation resistance.

Description

technical field [0001] The invention relates to the technical field of passivating agents, in particular to a passivating agent for tin plating. Background technique [0002] In recent years, with the rapid development of the electronics industry, the demand for solderable tin coatings in electronic components and printed circuit boards has become higher and higher. At the same time, due to the stability of tin to organic acids and its harmlessness to the human body, Tin plating is widely used in the food industry. For a long time, the corrosion resistance of tin coating has been a special concern of manufacturers. [0003] In order to improve the oxidation resistance, corrosion resistance, sulfide blackening resistance, and the bonding force with the paint film of the tin plating layer, it is necessary to passivate the tin plating layer. The most commonly used passivation treatment method is to use 6-valent Chromium chromate cathodic passivation treatment. Chromate passi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/47
CPCC23C22/47
Inventor 孙长志
Owner TIANCHANG FEILONG BRAND STEEL GRID
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