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Aluminum-zinc-tin system sacrificial anode material and preparation method thereof

A sacrificial anode, aluminum-zinc-tin technology, applied in the field of metal corrosion and protection, can solve the problems of high price, low current efficiency, limited promotion and application, etc., and achieve uniform surface solubility, stable working potential, and good activation performance. Effect

Inactive Publication Date: 2010-04-14
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Representative aluminum alloy sacrificial anode materials that have been successfully developed and applied include Al-Zn-Hg series, Al-Zn-Sn series, and Al-Zn-In series, but in practical applications, these anode materials all have shortcomings : For example, the Al-Zn-Hg anode material contains mercury, which is highly toxic. At present, this kind of Al-Zn-Hg alloy has been banned at home and abroad; the Al-Zn-In anode material has good comprehensive performance and is It has been used in engineering, but because In is a precious metal element, its resources are limited and it is difficult to refine, and due to the rapid increase in the use of In in high value-added electronic products, the price of In remains high, greatly increasing the Al-Zn -The cost of In-based anodes limits its popularization and application; and the Al-Zn-Sn anode material is currently less researched and used at home and abroad due to its low current efficiency, and some studies say that the anode needs to go through Certain heat treatment can achieve more stable and reliable performance, which limits its application to a large extent

Method used

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  • Aluminum-zinc-tin system sacrificial anode material and preparation method thereof
  • Aluminum-zinc-tin system sacrificial anode material and preparation method thereof

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Effect test

Embodiment 1

[0018] The percentage by weight of each component in the aluminum-zinc-tin sacrificial anode material of this embodiment is: Zn: 8.0%, Sn: 0.2%, Ga: 0.05%, the rest is aluminum, and the impurity content is ≤0.15%. When preparing, put the aluminum-zinc master alloy and aluminum-tin master alloy required for smelting into the crucible of a ZGJL0.01-40-4 induction melting furnace, and heat it under the protection of argon. After the master alloy is melted, the granular gallium component is wrapped by aluminum foil Press it into the crucible, continue heating to 700°C and keep it warm for 20 minutes. During the heat preservation, the crucible rotates automatically, and casts it in a preheated cast iron mold (preheated at 150°C for 0.5h), and takes it out after cooling for 0.5h to make aluminum zinc tin It is a sacrificial anode material. For the prepared Al-Zn-Sn sacrificial anode material, the electrochemical performance of the alloy was tested with a CHI660C electrochemical work...

Embodiment 2

[0020]The weight percentages of the components in the aluminum-zinc-tin sacrificial anode material of this embodiment are: Zn: 7.0%, Sn: 0.1%, Ga: 0.03%, the rest is aluminum, and the impurity content is ≤0.15%. During preparation, the aluminum-zinc master alloy, aluminum-tin master alloy and granular gallium required for melting are put into a ZGJL0.01-40-4 vacuum induction melting furnace for melting, and the melting temperature is 760°C for 8 minutes. During the heat preservation, the crucible rotates automatically. Pouring molding in a hot cast iron mold (preheating the cast iron mold at 150°C for 0.5h), taking it out after cooling for 0.5h, and making an Al-Zn-Sn sacrificial anode material. For the prepared aluminum alloy sacrificial anode material, the electrochemical performance of the alloy was tested with a CHI660C electrochemical workstation according to the electrochemical performance test method specified in the GT / T4948-2002 standard. The open circuit potential of...

Embodiment 3

[0022] The weight percentages of the components in the Al-Zn-Sn sacrificial anode material in this embodiment are: Zn: 6.0%, Sn: 0.05%, Ga: 0.01%, the rest is aluminum, and the impurity content is ≤0.15%. When preparing, put the aluminum-zinc master alloy and aluminum-tin master alloy required for smelting into the crucible of a ZGJL0.01-40-4 induction melting furnace, and heat it under the protection of argon. After the master alloy is melted, the granular gallium component is wrapped by aluminum foil Press it into the crucible, continue heating to 740°C for 10 minutes, the crucible rotates automatically during the heat preservation, pour into the preheated cast iron mold (cast iron mold is preheated at 150°C for 0.5h), take it out after cooling for 0.5h, and make aluminum zinc tin It is a sacrificial anode material. For the prepared aluminum alloy sacrificial anode material, the electrochemical performance of the alloy was tested with a CHI660C electrochemical workstation ac...

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Abstract

The invention discloses an aluminum-zinc-tin system sacrificial anode material and a preparation method thereof, wherein the material comprises the following components in percentage by weight: 5.0-8.0% of Zn, 0.05-0.2% of Sn, 0.01-0.05% of Ga, and the other is Al. Compared with an existing AlZn-Sn anode material, the aluminum-zinc-tin system sacrificial anode material briefly has the advantages that firstly, the aluminum-zinc-tin system sacrificial anode material of the invention has good activation performance, and reaches the reasonable range -1.0-1.1V(SCE) of protection potential, secondly, a minute quantity of Ga, Ga and Sn are added into the aluminum-zinc-tin system sacrificial anode material and are dissolved in solution in an ion state, tin ions are firstly restored to the original state, and deposit on the surface of an aluminum anode, and gallium ions also deposit on the deposited tin, thereby a Ga-Sn alloy active point with good flowing performance is continuously formed on the surface, oxidation film is partly separated, the aluminum anode has higher electric current efficiency and uniform surface dissolve performance, thirdly, the current efficiency of the aluminum-zinc-tin system sacrificial anode material of the invention can reach above 93% through micro-alloying, and the actual capacitance quantity reaches above 2620A.h.kg-1.

Description

technical field [0001] The invention relates to an aluminum-zinc-tin-based sacrificial anode material, in particular to an aluminum-zinc-tin-gallium sacrificial anode material, and also to a preparation method of the aluminum-zinc-tin-gallium sacrificial anode material, which belongs to the technical field of metal corrosion and protection. Background technique [0002] Metal corrosion is one of the main forms of damage to metal equipment and components. The sacrificial anode protection method is a very advantageous anti-corrosion method in the electrolyte environment. The method is to connect the protected metal (cathode) with a metal (anode) that is more negative than its potential. The two metals are in the same electrolyte (soil, sea water, natural water, etc.), and the protected metal is connected There is a large potential difference between them and the current generated by the continuous active dissolution of the sacrificial anode material performs cathodic polarizat...

Claims

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Application Information

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IPC IPC(8): C23F13/14C22C21/10C22C1/03
Inventor 文九巴马景灵王国伟贺俊光史志红赵胜利李全安
Owner HENAN UNIV OF SCI & TECH
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