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Low-driving potential aluminum alloy sacrificial anode

A sacrificial anode and aluminum alloy technology, which is applied in the field of corrosion protection, can solve problems such as low current efficiency, uneven dissolution morphology, and obvious localized corrosion phenomena, and achieve good potential stability, uniform anodic dissolution morphology, and improved anode dissolution topographical effect

Active Publication Date: 2009-06-03
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The working potential range of the anode is -700mV~-870mV, the dissolution morphology is uneven, the local corrosion phenomenon is obvious, and the current efficiency is low, only 55%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Use high-purity aluminum as raw material, add trace alloying elements (weight percentage): zinc 0.75% (wt), gallium 0.10% (wt), silicon 0.75% (wt), other impurities iron + copper + nickel ≦ 0.15%, calcium ≦0.15%, the balance is aluminum. The low driving potential aluminum alloy sacrificial anode of the present invention is produced by casting process: first, put the aluminum ingot into the aluminum melting furnace for melting, then add zinc, gallium, silicon and other materials when all the aluminum ingots are about to be melted, and stir with a graphite rod or a stirring device , and then remove impurities such as oxidized slag on the surface of the molten aluminum, and then it can be cast out of the furnace. The casting process must be continuous, and the molten aluminum can be completely cooled and solidified. According to the test results of GB / T17859-1999 sacrificial anode electrochemical performance test standard, the open circuit potential is -0.843~-0.995V, the ...

Embodiment 2

[0013] Using high-purity aluminum as raw material, adding trace alloying elements (weight percent): zinc 0.05% (wt), gallium 0.30% (wt), silicon 1.50% (wt), other impurities iron + copper + nickel ≦ 0.15%, calcium ≦0.15%, the balance is aluminum. The low driving potential aluminum alloy sacrificial anode of the present invention is prepared by a smelting method. According to the test results of GB / T17859-1999 sacrificial anode electrochemical performance test standard, the open circuit potential is -0.835~-0.992V, the working potential is -0.801~-0.831V, the current efficiency is 85.1%, the dissolution is uniform, and the corrosion products fall off.

Embodiment 3

[0015] Using high-purity aluminum as raw material, adding trace alloying elements (weight percent): zinc 1.00% (wt), gallium 0.05% (wt), silicon 0.50% (wt), other impurities iron + copper + nickel ≦ 0.15%, calcium ≦0.15%, the balance is aluminum. The low driving potential aluminum alloy sacrificial anode of the present invention is prepared by a smelting method. According to the test results of GB / T17859-1999 sacrificial anode electrochemical performance test standard, the open circuit potential is -0.856~-1.035V, the working potential is -0.810~-0.842V, the current efficiency is 86.2%, the dissolution is uniform, and the corrosion products fall off.

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Abstract

The invention relates to a low-driving potential aluminum alloy sacrificial anode. The sacrificial anode comprises (wt%) the components as follows: zinc 0.05-1.0, indium 0.05-0.3, silicon 0.5-1.5, impurities including ferrum, copper and nickel not higher than 0.30, and high purity aluminum as a main raw material in balance. The sacrificial anode is manufactured by casting technique or other metallurgical means. The sacrificial anode has an operating potential in natural seawater of -0.80-(-0.85) V; has the advantages of uniform dissolution pattern, and high current efficiency (not lower than 85%); and can be used for corrosion control of hydrogen embrittlement sensitive materials such as high-tensile steel, stainless steel and titanium alloy.

Description

Technical field: [0001] The invention relates to a corrosion protection technology for structures of hydrogen embrittlement sensitive materials such as high-strength steel, stainless steel and titanium alloy in a marine environment, in particular to a low driving potential aluminum alloy sacrificial anode. Background technique: [0002] The marine environment is a harsh corrosive environment, and metal structures serving in the marine environment usually adopt cathodic protection corrosion protection technology. With the development of material technology, the strength grade of high-strength steel is getting higher and higher, and its application is becoming more and more extensive. Materials such as high-strength steel, high-strength stainless steel, and titanium alloys are widely used in weapons and equipment, submarine pipelines, and seawater cooling water piping systems. These materials are sensitive to hydrogen embrittlement. As the strength increases, they are prone to...

Claims

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Application Information

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IPC IPC(8): C23F13/14
Inventor 闫永贵马力钱建华
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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