Aluminum alloy anode suitable for high-resistivity environment and preparation method for aluminum alloy anode

A high-resistivity, aluminum alloy technology, applied in the field of corrosion and protection, can solve the problems of limited application, uneven corrosion pattern of working potential, etc., to achieve the effect of convenient control, mild conditions, and improved working potential

Pending Publication Date: 2021-09-14
SUNRUI MARINE ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides an aluminum alloy anode suitable for high-resistivity environments and a preparation method thereof, which solves the problems of the aluminum alloy sacrificial anodes in the prior art, which have been limited in their use in seabed mud and low-salt environments due to their working potential correction and uneven corrosion patterns. Application problems in high resistivity media such as water

Method used

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  • Aluminum alloy anode suitable for high-resistivity environment and preparation method for aluminum alloy anode
  • Aluminum alloy anode suitable for high-resistivity environment and preparation method for aluminum alloy anode
  • Aluminum alloy anode suitable for high-resistivity environment and preparation method for aluminum alloy anode

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preparation example Construction

[0027] A method for preparing an aluminum alloy anode suitable for a high-resistivity environment of the present invention comprises the following steps: 1) taking an aluminum ingot as a raw material for the aluminum element, heating the crucible to 700-800° C., and melting the aluminum ingot; 2) The raw materials of zinc, indium, tin, silicon and titanium were weighed respectively, added to the molten aluminum liquid obtained in step 1), stirred evenly with a graphite rod, slag removed, cast into a mold, cooled, and taken out to obtain an anode.

[0028] Preferably, 10% or 20% aluminum-silicon alloy is used as the raw material for the silicon element, and aluminum-titanium alloy or titanium boride is used as the raw material for the titanium element.

Embodiment 1

[0030] The commercially available 99.85Al ingot is used as the raw material, and the crucible is heated to 700-800°C to melt the aluminum ingot. Add the raw materials of Zn, In, Sn, Si and Ti elements, stir evenly, remove slag, cast into the required mold, take out the anode after cooling. Concrete embodiment formula ratio is as follows:

[0031] In weight percentage: Zn: 4.0%; In: 0.02%; Si: 0.2%; Sn: 0.01%; Ti: 0.03%; impurity content: Fe: 0.07%; Cu: 0.001%; ​​the balance is Al. The sample number is D1.

[0032] Among them, the anode is manufactured by casting method, the silicon element is made of 10% or 20% aluminum-silicon alloy as raw material, the titanium element is made of aluminum-titanium alloy or titanium boride, and the three elements of zinc, indium and tin are respectively made of corresponding metal elements For the raw material.

Embodiment 2

[0034] The sample number is D2, and the formula of the aluminum alloy anode is calculated as:

[0035] Zn: 5.5%; In: 0.03%; Si: 0.40%; Sn: 0.015%; Ti: 0.02%; impurity content: Fe: 0.07%; Cu: 0.001%;

[0036] The anode is manufactured by melting and casting, and the casting method is the same as in Example 1. The silicon element is made of 10% or 20% aluminum-silicon alloy as the raw material, the titanium element is made of aluminum-titanium alloy or titanium boride, and the three elements of zinc, indium and tin are respectively The corresponding metal element is used as raw material.

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Abstract

The invention discloses an aluminum alloy anode suitable for a high-resistivity environment and a preparation method for the aluminum alloy anode, and belongs to the technical field of corrosion and protection. The aluminum alloy anode consists of the following elements, by weight, 4.0-6.0% of zinc; 0.015% to 0.030% of indium; 0.05 to 0.40% of silicon; less than or equal to 0.02% of tin; less than or equal to 0.03% of titanium; the impurities which include less than or equal to 0.07% of iron and less than or equal to 0.001% of copper; and the balance aluminum. The aluminum alloy anode has excellent performance in seawater and can also be used for places with higher performance requirements, including seabed mud and low-salinity water, such as estuaries and bays, and the attenuation of the potential of the anode along with the increase of the resistivity is obviously smaller than that of a common aluminum anode; in 70-80 omega.cm fresh seawater, the working potential is negative than -1.05 V, and the capacitance is higher than 2600 A.h / Kg; and the aluminum alloy anode is particularly suitable for cathode protection of seabed Christmas trees, manifolds, seabed immersed tube type tunnel shells and other structures, and is economical and practical.

Description

[0001] This application is a divisional application of a patent application entitled "A Aluminum Alloy Anode Suitable for High Resistivity Environment and Its Preparation Method". The original application date was October 18, 2016, and the application number was 201610908965. X. technical field [0002] The invention relates to the technical field of corrosion and protection, in particular to an aluminum alloy anode suitable for high resistivity environments and a preparation method thereof. Background technique [0003] The ocean is the harshest natural corrosion environment, and metal structures are inevitably corroded by seawater and sea mud. Aluminum alloy sacrificial anode cathodic protection is an important means of anticorrosion of metal structures in seawater, sea mud, and salt water; compared with zinc anodes, the aluminum alloy anode materials used are usually required to have the characteristics of high capacitance and more negative working potential. This reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F13/14C22C21/10C22C1/03
CPCC22C21/10C23F13/14C22C1/026C22C1/03C23F2213/31
Inventor 赵永韬
Owner SUNRUI MARINE ENVIRONMENT ENG
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