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Method for solving high-temperature oxidation of nickel silver C7521

A technology of high temperature oxidation and zinc cupronickel, applied in the field of copper strip casting and processing, can solve the problem of high processing cost, and achieve the effect of avoiding dezincification, improving the microstructure and reducing the phenomenon of dezincification.

Inactive Publication Date: 2011-11-23
CNMC ALBETTER ALBRONZE
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Problems solved by technology

[0003] However, zinc-nickel-nickel copper requires high temperature resistance up to 270°C in terms of mobile phone shielding and crystal oscillator shells. This is the main reason for restricting the domestic production of zinc-nickel-nickel copper C7521. Difficult Problems for Processing Enterprises

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  • Method for solving high-temperature oxidation of nickel silver C7521
  • Method for solving high-temperature oxidation of nickel silver C7521
  • Method for solving high-temperature oxidation of nickel silver C7521

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Embodiment 1

[0029] Through the metallographic structure and grain map, it is found that there are fine black particles on the grain boundary of the slab, which are confirmed to be substances such as S element and its compounds that affect the yellowing of the strip, so the content of trace elements in the strip needs to be controlled.

[0030] The composition of the yellowing substance contains C, O and other substances detected by a scanning electron microscope. The origin of C is mainly due to incomplete degreasing during cleaning and residual rolling oil. When heated in a bell furnace, it is carbonized at a high temperature to form carbon black, so the concentration of lye is adjusted, but due to The concentration of lye is increased, and in order to prevent excessive lye from remaining, the concentration of acid is also increased accordingly; O is mainly due to the oxidation of zinc, nickel, and copper at a temperature of 250°C, and then adheres to the surface; In addition, energy spe...

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Abstract

The invention discloses a method capable of enabling a nickel silver C7521 strip not to become yellow at high temperature of 270 DEG C. The root causes of nickel silver yellowing are mainly determined by researching metallographical microscopic structure, analyzing crystal grain spectrum and improving the factors causing nickel silver yellowing. The result proves that control on contents of trace elements in the casting blank, increase of concentration of acid / alkali liquid, proper number of press-down of the brush, decrease of annealing temperature, extension of holding time, production cycle reduction, improvement of every cleaning step and the like are the means for solving the high-temperature yellowing of nickel silver C7521 in actual production.

Description

technical field [0001] The invention relates to a method for solving high-temperature oxidation of zinc white copper C7521, and belongs to the technical field of copper strip casting and processing. This patent is to solve the problem of yellowing of zinc white copper C7521 at high temperature of 270°C, improve the high temperature oxidation resistance of copper strips, increase the yield of strips, and increase the economic benefits of enterprises. Background technique [0002] As we all know, zinc-nickel copper C7521 is a zinc-nickel copper containing 18% zinc and nickel, and the balance is copper. Commonly known as "German silver", it has good mechanical properties, corrosion resistance, easy brazing and hot and cold processing, and is widely used in mobile phone shielding, crystal oscillator shells, crystal shells, slides for potentiometers, medical machinery, construction, wind instruments, etc. aspect. [0003] However, zinc-nickel-nickel copper requires high tempera...

Claims

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Application Information

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IPC IPC(8): C22C9/06C22C1/02C22F1/08C23G1/10C23G1/20
Inventor 郭丽丽张西军李学帅梁琦明田英明郑朋艳张伟
Owner CNMC ALBETTER ALBRONZE
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