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Nickel release detection standard substance preparation method

A technology for nickel release and detection standards, which is applied in the field of preparation of nickel release detection standards, can solve the problem of high cost, and achieve the effects of easy marketization, convenient operation and strong production operability.

Inactive Publication Date: 2013-12-25
许菲菲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many third-party testing agencies in China to carry out nickel release testing, but there is still no standard product for nickel release testing in China. Currently, the commonly used standard products for nickel release testing are generally imported from abroad, based on gold and It is made by mixing nickel, the cost is high, and its uniformity and stability need to be further improved

Method used

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  • Nickel release detection standard substance preparation method
  • Nickel release detection standard substance preparation method
  • Nickel release detection standard substance preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Preparation of 5% sample A standard.

[0015] (1) Preparation of raw materials: uniformly mix brass powder and nickel powder at a mass ratio of 100:5 to prepare pre-smelting raw materials;

[0016] (2) Smelting: a) Put about 1kg of pre-smelted raw material obtained in step (1) into a graphite crucible, add a layer of activated carbon powder on the surface of the pre-smelted raw material to prevent oxidation, and then place it in an intermediate frequency induction device; b) set Set the initial induction current to 75 A, heat and smelt. During the smelting process, stir with a graphite rod every 2 minutes for about 3 minutes; c) reduce the current value to 50 A when the evaporation is severe, and continue About 2 minutes; d) Repeat steps b and c for 3 times with argon protection during the process; e) Before pouring the melt, increase the current value to 80 A, heat for 1 minute, and stir with a graphite rod, and then quickly put The melt is poured into a graphite mold...

Embodiment 2

[0019] Preparation of 2% sample B standard.

[0020] (1) Preparation of raw materials: uniformly mix brass powder and nickel powder at a mass ratio of 100:2.5 to prepare pre-smelting raw materials;

[0021] (2) Smelting: a) Put about 1kg of pre-smelted raw material obtained in step (1) into a graphite crucible, add a layer of activated carbon powder on the surface of the pre-smelted raw material to prevent oxidation, and then place it in an intermediate frequency induction device; b) set Set the initial induction current to 70 A, heat and smelt. During the smelting process, stir with a graphite rod every 2 minutes for about 5 minutes; c) When the evaporation is severe, reduce the current value to 52 A and continue About 2 minutes; d) Repeat steps b and c for 3 times with argon protection during the process; e) Before pouring the melt, increase the current value to 80 A, heat for 0.5 minutes, and stir with a graphite rod, and then quickly put The melt is poured into a graphite...

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Abstract

The present invention relates to a nickel release detection standard substance preparation method, which comprises: uniformly mixing brass powder and nickel powder according to a certain ratio to prepare a pre-smelting raw material; placing the raw material in a graphite crucible, adding a layer of active carbon powder on the surface, and placing into an intermediate frequency induction device; setting an initial induction current to 70+ / -5 A, carrying out heat smelting, and maintaining for 3-5 min; reducing the current value to 50+ / -5 A, and maintaining for 1-2 min; repeatedly performing the previous steps three times, and carrying out argon gas protection during the processes; increasing the current value to 80 A, heating for 0.5-1 min, and then pouring into a graphite mold to prepare a round bar-like specimen; cutting the specimen into a sheet with phi20*1.3 mm, grinding to achieve a thickness of 1.2 mm and a weight of about 3.0 g; and cleaning the grinded specimen with alcohol, and carrying out hot air drying. The preparation method has characteristics of simple process, strong production operability, easy operation, low cost, easily available raw materials, and easy marketization, wherein the obtained standard substance has good uniformity and good stability.

Description

technical field [0001] The invention relates to a preparation method of a nickel release detection standard product. Background technique [0002] Nickel is widely used in the manufacture of jewelry, coins, metal buttons, etc., and nickel is the most common cause of contact allergy. About 10% to 20% of women are allergic to nickel. The skin absorbs nickel ions released from nickel-containing materials that are in direct contact with the skin for a long time, resulting in allergies, and further exposure to soluble nickel salts will cause allergic contact dermatitis. Directive 94 / 27 / EC of the European Parliament and the Council of the European Union (OJ No.L188 of 22.7.94) stipulates that the release rate threshold of nickel is 0.5μg / cm 2 ·week. [0003] At present, there are many third-party testing agencies in China to carry out nickel release testing, but there is still no standard product for nickel release testing in China. The commonly used standard products for nickel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28C22C1/02C22C9/00
Inventor 许菲菲洪灯柴明青楼佳朱隽姜士磊赵梅荣项伟汪季娟
Owner 许菲菲
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