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Environment-friendly sacrificial zinc alloy anode

A sacrificial anode and zinc alloy technology, which is applied in the field of corrosion and protection, can solve problems such as human respiratory tract and liver hazards, achieve the effects of lower melting temperature, wide application range, and reduced combustion loss

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

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Problems solved by technology

However, the addition of cadmium will cause great harm to the environment, human respiratory tract and liver, and the incubation period can be as long as 10-30 years

Method used

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  • Environment-friendly sacrificial zinc alloy anode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Zinc alloy sacrificial anode element weight percentage: Al: 0.33%, Mg: 0.78%, Ca: 0.022%, of which impurity elements Fe: 0.002%, Pb: 0.0028%, Cu: 0.0009%, Cd: 0.0015%, the balance is Zn .

[0021] Heat the 99.99 zinc ingot in the national standard GB / T 470-2008 to 480°C in a melting furnace to melt the zinc ingot completely, and add zinc-magnesium alloy, zinc-aluminum alloy and zinc-calcium alloy according to the ratio of the above components. Among them, the mass percentage content of magnesium in the zinc-magnesium alloy is 45%, the mass percentage content of aluminum in the zinc-aluminum alloy is 8%, and the mass percentage content of calcium in the zinc-calcium alloy is 55%. After the alloy addition is completed, cover the graphite layer on the zinc liquid, and at the same time pass nitrogen in the smelting furnace to evacuate the air and reduce the oxygen content, turn on the magnetic stirring to fully stir, and stir for 17 minutes to mix the alloy elements evenly....

Embodiment 2

[0023] The weight percentage of each component of the zinc alloy sacrificial anode: Al: 0.49%, Mg: 1.28%, Ca: 0.046%, of which impurity elements Fe: 0.0018%, Pb: 0.0022%, Cu: 0.0008%, Cd: 0.0018%, and the rest The amount is Zn.

[0024] Heat the 99.99 zinc ingot in the national standard GB / T 470-2008 to 470°C in a melting furnace to melt the zinc ingot completely, and then add zinc-magnesium alloy, zinc-aluminum alloy and zinc-calcium alloy according to the ratio of the above components. Among them, the mass percentage content of magnesium in the zinc-magnesium alloy is 48%, the mass percentage content of aluminum in the zinc-aluminum alloy is 15%, and the mass percentage content of calcium in the zinc-calcium alloy is 50%. After the alloy addition is completed, cover the graphite layer on the zinc liquid, and at the same time pass nitrogen in the smelting furnace to evacuate the air and reduce the oxygen content, turn on the magnetic stirring to fully stir, and stir for 15 mi...

Embodiment 3

[0026] The weight percentage of zinc alloy sacrificial anode: Al: 0.18%, Mg: 0.35%, Ca: 0.032%, of which impurity elements Fe: 0.0012%, Pb: 0.0039%, Cu: 0.0009%, Cd: 0.0021%, the balance is Zn .

[0027] Heat the 99.99 zinc ingot in the national standard GB / T 470-2008 to 460°C in a melting furnace to melt the zinc ingot completely, and add zinc-magnesium alloy, zinc-aluminum alloy and zinc-calcium alloy according to the ratio of the above components. Wherein the mass percentage content of magnesium in the zinc-magnesium alloy is 40%, the mass percentage content of aluminum in the zinc-aluminum alloy is 15%, and the mass percentage content of calcium in the zinc-calcium alloy is 58%. After the alloy addition is completed, cover the graphite layer on the zinc liquid, and at the same time pass nitrogen in the smelting furnace to evacuate the air and reduce the oxygen content, turn on the magnetic stirring and stir thoroughly, and stir for 12 minutes to mix the alloy elements even...

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Abstract

The invention discloses an environment-friendly sacrificial zinc alloy anode, and belongs to the technical fields of corrosion and protection. The environment-friendly sacrificial zinc alloy anode disclosed by the invention comprises the following components in percentage by weight: 0.1%-0.5% of Al, 0.25%-1.5% of Mg, 0.01%-0.05% of Ca, not more than 0.003% of an impurity element Fe, not more than 0.006% of an impurity element Pb, not more than 0.002% of an impurity element Cu, not more than 0.003% of Cd and the balance of Zn. The invention further provides a preparation method of the sacrificial zinc alloy anode. According to the sacrificial zinc alloy anode prepared by the preparation method provided by the invention, the working potential is minus 1.00 to minus 1.06V; a corrosion product easily falls off; the corrosion morphology is uniformly dissolved; and the electric capacity is greater than or equal to 800A.h / Kg. The sacrificial zinc alloy anode disclosed by the invention is wide in application range, small in environmental pollution, simple in preparation method and low in cost, and has obvious economic benefits and environmental benefits.

Description

technical field [0001] The invention relates to a zinc alloy sacrificial anode, in particular to an environment-friendly zinc alloy sacrificial anode, which belongs to the technical field of corrosion and protection. Background technique [0002] Zinc-based sacrificial anode has low self-corrosion rate, high current efficiency, and its potential is close to the protection potential of steel. It has the characteristics of automatic current adjustment, and there is no danger of over-protection when used. The driving voltage of the zinc-based anode is only about 0.2V, which is mainly suitable for seawater, salt water and low resistivity (<15Ω·cm) soil environment. At present, zinc alloy sacrificial anodes have been widely used in cathodic protection projects for marine structures and submarine pipeline projects. At the same time, the zinc alloy sacrificial anode does not undergo hydrogen evolution reaction during use, and will not induce sparks when it collides with steel c...

Claims

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Application Information

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IPC IPC(8): C23F13/14C22C18/00C22C18/04C22C1/03
Inventor 王海涛刘光洲王洪仁许舒
Owner SUNRUI MARINE ENVIRONMENT ENG
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