Zinc alloy sacrificial anode applicable to hot seabed mud environment

A sacrificial anode and zinc alloy technology, which is applied in the field of marine equipment anti-corrosion, can solve the problems of low anode efficiency, achieve uniform dissolution of corrosion morphology, easy fall off, and reduce production costs

Active Publication Date: 2015-08-26
SUNRUI MARINE ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reported use environment of the anode is limited to sea mud in Bohai Bay, and the efficiency of the anode is 70% in sea mud at 50°C, and the efficiency of the anode is not high

Method used

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  • Zinc alloy sacrificial anode applicable to hot seabed mud environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Zinc alloy sacrificial anode formula (mass fraction): Al 0.15%, Mg 0.52%, In 0.028%, Ga 0.012%, of which impurity elements Fe 0.0015%, Pb 0.0038%, Cu 0.0008%, Cd 0.0015%, the balance is Zn .

[0013] Before smelting, preheat zinc ingots, zinc-aluminum alloys, and zinc-magnesium alloys to 100°C to remove moisture in the materials. Then heat the melting furnace to 450°C to completely melt the zinc ingot, add zinc-magnesium alloy (the mass fraction of magnesium is 46%) according to the formula ratio, cover the graphite layer above the zinc liquid to isolate the air, and use graphite artificially Rod stirring, stirring time 5 minutes. When the temperature of the zinc liquid rises to 480°C, add zinc-aluminum alloy (the mass fraction of aluminum is 12%) according to the formula ratio, and the stirring method is the same as above. When the temperature of the zinc liquid rises to 530°C, stop heating. Use a small crucible to scoop up the zinc liquid, wrap the indium ingot and...

Embodiment 2

[0015] Zinc alloy sacrificial anode formula (mass fraction): Al 0.38%, Mg 0.78%, In 0.017%, Ga 0.015%, of which impurity elements Fe 0.0012%, Pb 0.0035%, Cu 0.0005%, Cd 0.0012%, the balance is Zn .

[0016] Before smelting, preheat zinc ingots, zinc-aluminum alloys, and zinc-magnesium alloys to 100°C to remove moisture in the materials. Then heat the melting furnace to 430°C to completely melt the zinc ingot, add zinc-magnesium alloy (the mass fraction of magnesium is 50%) according to the formula ratio, cover the graphite layer above the zinc liquid to isolate the air, and use graphite artificially Stick stirring, stirring time 3 minutes. When the temperature of the zinc liquid rises to 470°C, add zinc-aluminum alloy (the mass fraction of aluminum is 8%) according to the formula ratio, and the stirring method is the same as above. When the temperature of the zinc liquid rises to 550°C, stop heating. Use a small crucible to scoop up the zinc liquid, wrap the indium ingot an...

Embodiment 3

[0018] Zinc alloy sacrificial anode formula (mass fraction): Al 0.23%, Mg 0.22%, In 0.011%, Ga 0.020%, of which impurity elements Fe 0.0018%, Pb 0.0028%, Cu 0.0009%, Cd 0.0019%, the balance is Zn .

[0019] Before smelting, preheat zinc ingots, zinc-aluminum alloys, and zinc-magnesium alloys to 100°C to remove moisture in the materials. Then heat the melting furnace to 450°C to completely melt the zinc ingot, add zinc-magnesium alloy (the mass fraction of magnesium is 41%) according to the formula ratio, cover the graphite layer above the zinc liquid to isolate the air, and use permanent magnets at the same time Stir, clockwise and counterclockwise for 3 minutes each. When the temperature of the zinc liquid rises to 470°C, add zinc-aluminum alloy (the mass fraction of aluminum is 15%) according to the formula ratio, and the stirring method is the same as above. When the temperature of the zinc liquid rises to 540°C, stop heating. Use a small crucible to scoop up the zinc li...

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Abstract

The invention discloses a zinc alloy sacrificial anode applicable to a hot seabed mud environment. Zinc is taken as a raw material, and alloy elements such as aluminum, magnesium, indium and gallium are added to eliminate the influence of impurity elements to the chemical property of a sacrificial anode. The zinc alloy sacrificial anode comprises the following components in percentage by mass: 0.1-0.4% of Al, 0.1-0.8% of Mg, 0.005-0.03% of In, 0.01-0.02% of Ga, less than or equal to 0.003% of an impurity element Fe, less than or equal to 0.006% of Pb, less than or equal to 0.002% of Cu, less than or equal to 0.002% of Cd, and the balance of Zn. The electric chemical properties of the zinc alloy sacrificial anode are that the working potential in the hot seabed mud environment of 50-80 DEG C is stabilized to be minus 1.00 V-minus 1.06V (relative to an Ag/AgCl reference electrode), corroded products can be easily dropped off, the corrosion morphology can be uniformly dissolved, the capacitance is greater than or equal to 780A.h/Kg, the current efficiency is greater than or equal to 94%, and the zinc alloy sacrificial anode is applied to anode protection of metal structures in the hot seabed mud environment.

Description

technical field [0001] The invention relates to a zinc alloy sacrificial anode, in particular to a zinc alloy sacrificial anode suitable for hot sea mud environment, and belongs to the field of marine equipment anticorrosion. Background technique [0002] With the development of the offshore oil industry, the mileage of submarine oil pipelines has increased rapidly. In order to ensure the safe and effective operation of these submarine pipelines, coating and sacrificial anode protection methods are mostly used at present. However, anode materials with good performance in seawater are often not effective in sea mud, especially in a high temperature environment (50-80°C), the performance of the anode will drop sharply. In the protection of submarine oil pipelines, since marine crude oil needs to be heated to reduce the viscosity of crude oil during transportation, the temperature of seawater and sea mud around submarine oil pipelines is high, and anode failures often occur. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C18/00C22C18/04C22C1/03C23F13/14
Inventor 王海涛刘光洲许实王辉于林
Owner SUNRUI MARINE ENVIRONMENT ENG
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