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Trivalent-chromium blue-white passivator for zinc-plated permanent magnetic material and passivation method thereof

A permanent magnet material, trivalent chromium technology, applied in the direction of metal material coating process, etc., can solve the problems of poor operability, many control factors, difficult to use, etc., to achieve low cost, improved working environment, and short operating time. Effect

Inactive Publication Date: 2011-05-04
BEIJING ZHONG KE SAN HUAN HI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned patent uses trivalent chromium instead of hexavalent chromium. Although it achieves the purpose of environmental protection and protecting the health of operators, in the passivation process, there are many control factors and the control range is narrow, resulting in the defect that it is difficult to use and poor in operability. At the same time, its passivation The anti-corrosion performance of the galvanized permanent magnet material needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The composition of the passivating agent is as follows:

[0033] Chromium trichloride 8g / L Sodium fluoride 5g / L

[0034] Nitric acid 6g / L OP-10 3g / L

[0035] Cobalt chloride 10g / L

[0036] Light the galvanized permanent magnet material in 5% nitric acid, and then rinse the light permanent magnet material with clear water. Weigh the passivating agent according to the composition of the above passivating agent, and dissolve the passivating agent in 1 liter of water. Put the permanent magnet material into the aqueous solution of the above passivating agent for passivation. The passivation is carried out under the conditions of pH 1.5 and temperature 60°C, and the passivation time is 15 seconds; after the passivation is completed, put the permanent magnet material into Aging in hot water at 60-80°C for 3-10 seconds, and finally drying.

Embodiment 2

[0038] The composition of the passivating agent is as follows:

[0039] Chromium trichloride 8g / L Sodium fluoride 5g / L

[0040] Nitric acid 6g / L OP-10 3g / L

[0041] Cobalt chloride 10g / L

[0042] Light the galvanized permanent magnet material in 5% nitric acid, and then rinse the light permanent magnet material with clear water. Weigh the passivating agent according to the composition of the above passivating agent, and dissolve the passivating agent in 1 liter of water. Put the permanent magnet material into the aqueous solution of the above passivating agent for passivation. The passivation is carried out under the conditions of pH 1.5 and temperature 10°C, and the passivation time is 25 seconds; after the passivation is completed, put the permanent magnet material into Aging in hot water at 60-80°C for 3-10 seconds, and finally drying.

Embodiment 3

[0044] The composition of the passivating agent is as follows:

[0045] Chromium trichloride 8g / L Sodium fluoride 5g / L

[0046] Nitric acid 6g / L OP-10 3g / L

[0047]Cobalt chloride 10g / L

[0048] Light the galvanized permanent magnet material in 5% nitric acid, and then rinse the light permanent magnet material with clear water. Weigh the passivating agent according to the composition of the above passivating agent, and dissolve the passivating agent in 1 liter of water. Put the permanent magnet material into the aqueous solution of the above passivating agent for passivation. The passivation is carried out under the conditions of pH 1.5 and temperature 30°C, and the passivation time is 30 seconds; after the passivation is completed, put the permanent magnet material into Aging in hot water at 60-80°C for 3-10 seconds, and finally drying.

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Abstract

The invention provides a trivalent-chromium blue-white passivator for a zinc-plated permanent magnetic material and a passivation method thereof. The trivalent-chromium blue-white passivator contains a main film-forming agent, an auxiliary film-forming agent, a stabilizer, an oxidant and a surfactant, wherein the main film-forming agent is a soluble salt of trivalent chromium, the stabilizer is selected from at least one of fluoride, citric acid and oxalic acid, the auxiliary film-forming agent is selected from at least one of soluble cobalt salt, soluble nickel salt or soluble salts of rare-earth elements, the oxidant is nitrate ions or hydrogen peroxide, and the surfactant is NPE (Nonylphenol Polyoxyethylene Ether) or sodium dodecyl benzene sulfonate. The trivalent-chromium blue-white passivator provided by the invention has a low cost, does not pollute the environment, and also does not cause damage to the health of operators.

Description

technical field [0001] The invention relates to a trivalent chromium blue-white passivator and a passivation method thereof, in particular to a trivalent chromium blue-white passivator for galvanized permanent magnet materials and a passivation method thereof. Background technique [0002] In recent years, the application and development of NdFeB permanent magnet materials is very rapid, and whether NdFeB permanent magnet materials can be effectively protected is one of the key technologies related to the promotion and application of NdFeB permanent magnet materials. NdFeB permanent magnet materials are mainly prepared from rare earth metals such as neodymium, iron and boron through powder metallurgy process. As the strongest magnetic material at present, it has been widely used in electroplating devices, machinery, medical treatment, automobiles and other fields, and its application prospects are very broad. [0003] The premise of the wide application of NdFeB permanent m...

Claims

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Application Information

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IPC IPC(8): C23C22/34C23C22/46
Inventor 白晓刚
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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