Double layer aluminum alloy composite sacrificial anode

A sacrificial anode and aluminum alloy technology, which is applied in the field of double-layer aluminum alloy composite sacrificial anodes, can solve the problems of no advantages of magnesium alloy anodes, complex production and manufacturing process, and small capacitance of magnesium alloy anodes, so as to achieve good protection effect and production And the effect of simple manufacturing process and long service life

Inactive Publication Date: 2009-02-04
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 1. Magnesium alloy is flammable, so molten salt and sulfur powder must be used for protection during smelting and casting. The production and manufacturing process is relatively complicated, and it pollutes the environment, which is not conducive to the health of operators
[0007] 2. Magnesium alloy anodes have small capacitance and low current efficiency, and the market price is higher than that of aluminum-based anodes. Therefore, in terms of cost of use, magnesium alloy anodes have no advantages at all.

Method used

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  • Double layer aluminum alloy composite sacrificial anode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the provisions of GB / T17848-1999, the electrochemical performance tests were carried out on the outer layer aluminum anode and the inner layer aluminum anode of the composite sacrificial anode sample. Wherein the composition of the outer layer is (by weight percentage): 3.0% zinc, 0.10% gallium, 0.022% indium, 0.012% tin, 0.01% bismuth, and the balance is aluminum; the inner layer composition is (by weight percentage): zinc 4.0 %, magnesium 1.0%, indium 0.022%, tin 0.02%, titanium 0.02%, and the balance is aluminum. The test results are: the working potential of the outer aluminum anode is -1.40--1.45V, and the current efficiency is about 50%; the working potential of the inner aluminum anode potential is -1.08--1.10V, and the current efficiency is about 90%. The composite sacrificial anode of the invention is composed of two different aluminum-based sacrificial anode materials, the inner and outer layers, and the inner and outer layers are closely combined...

Embodiment 2

[0031] In terms of weight percentage, the composition of the outer aluminum alloy of the sacrificial anode is: 3.5% zinc, 0.18% gallium, 0.022% indium, 0.01% tin, 0.03% bismuth, and the balance is aluminum; the inner layer aluminum of the sacrificial anode The composition of the alloy is: 3.0% zinc, 0.02% indium, 0.02% cadmium, 0.015% tin, 0.80% magnesium, 0.08% silicon, 0.04% titanium, and the balance is aluminum.

Embodiment 3

[0033] In terms of weight percentage, the composition of the outer aluminum alloy of the sacrificial anode is: 2.5% zinc, 0.06% gallium, 0.045% indium, 0.03% tin, 0.01% bismuth, and the balance is aluminum; the inner layer aluminum of the sacrificial anode The composition of the alloy is: 5.5% zinc, 0.04% indium, 0.01% cadmium, 0.05% silicon, and the balance is aluminum.

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Abstract

This invention relates to a double layer Al alloy compound sacrificial anode composed of two kinds of Al-base sacrificial anode materials, in which, the components of the outer layer in weight proportion are: Zn 2.5-3.5%, Ga 0.05-0.20%, In 0.01-0.05%, Sn 0.01-0.03%, Bi 0.005-0.05% and Al, the components of the internal layer include: Zn 2.5-7.0%, In 0.018-0.05%, Cd 0-0.02%, Sn 0-0.075%, Mg 0-1.5%, Si 0-0.15%, Ti 0-0.08% and Al, which utilizes the advantages of the two kinds of Al anodes to use the outer Al anode to provide larger protection current at the beginning to polarize the steel structure swiftly and generate a surface deposition layer quickly so as to reduce the current desity necessary for stable polarization, after the consumption, the internal anode can protect the steel structure under rather small current.

Description

technical field [0001] The invention relates to an improvement technology of a composite sacrificial anode, in particular to a double-layer aluminum alloy composite sacrificial anode, which is suitable for cathodic protection of large-scale marine steel structures such as seaports, docks and ocean platforms. Background of the invention [0002] When designing cathodic protection, the protection current density is a very important parameter, and the protection current density required by steel structures in different periods varies greatly. Generally speaking, when the steel structure is just launched into the water, that is, the initial stage of polarization, the required protective current density is relatively high. After the initial stage, the required protective current density of the steel structure will be greatly reduced. In the actual marine engineering design, the design value of the protection current density required at the initial stage is generally twice the des...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F13/14
Inventor 孙虎元张克孙立娟张经磊
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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