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

A high-resistivity, aluminum alloy technology, applied in the field of corrosion and protection, can solve the problems of limited application, uneven corrosion form of working potential, etc., achieve significant social benefits, improve anti-corrosion effect, and improve the effect of working potential

Inactive Publication Date: 2017-05-10
SUNRUI MARINE ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 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 thereof
  • Aluminum alloy anode suitable for high-resistivity environment and preparation method thereof

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[0026] 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) Weigh the raw materials of zinc, indium, tin, silicon and titanium elements respectively, add them to the molten aluminum liquid obtained in step 1), stir evenly with a graphite rod, remove slag, cast into a mold, cool, take out, and obtain an anode.

[0027] 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

[0029] 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:

[0030] In terms of 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.

[0031] 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

[0033] The sample number is D2, and the formula of the aluminum alloy anode is calculated as:

[0034] Zn: 5.5%; In: 0.03%; Si: 0.40%; Sn: 0.015%; Ti: 0.02%; impurity content: Fe: 0.07%; Cu: 0.001%; ​​the balance is Al.

[0035] 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 high-resistivity environment and a preparation method thereof, and belongs to the technical field of corrosion and protection. The aluminum alloy anode consists of the following elements in percentage by weight: 4.0-6.0% of zinc, 0.015-0.030% of indium, 0.05-0.40% of silicon, tin not more than 0.02%, titanium not more than 0.03%, impurity content: iron not more than 0.07%, copper not more than 0.001%, and the balance of aluminum. The aluminum alloy anode is excellent in performance in seawater, and can be applied to places with higher performance requirements, including seabed mud and water with low salinity, such as estuaries and bays; the level is attenuated along with increment of the resistivity to be obviously lower than the level of a general aluminum anode; in diluted seawater of 70-80 omega.cm, the working level is lower than -1.05 V, and the capacitance is higher than 2600 A.h / Kg; and the aluminum alloy anode is specifically suitable for cathode protection of such structures as seabed Christmas tress, pipelines and seabed sinking pipe type tunnel shells, and is economical and practical.

Description

technical field [0001] The invention belongs to the technical field of corrosion and protection, in particular to an aluminum alloy anode suitable for a high resistivity environment and a preparation method thereof. Background technique [0002] 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 reduces the amount of sacrificial anodes used. Therefore, the use of high-performance aluminum alloy anode materials is the goal that anti-corrosion technology in the above-mentioned environment has been pursuing. [0003] Aluminum alloy anode materials have developed ternary alloys on...

Claims

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Application Information

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