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Aluminum alloy sacrificial anode for volumetric water heater

A sacrificial anode and water heater technology, applied in the field of aluminum alloy sacrificial anode materials, can solve the problems of performance stability of polluted water, low working potential, short service life, etc. Effect

Active Publication Date: 2014-08-13
厦门火炬特种金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an aluminum alloy sacrificial anode for volumetric water heaters to solve the problems of low working potential, low current efficiency, short service life, polluted water quality and performance stability of current sacrificial anode materials during use Poor and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] An aluminum alloy sacrificial anode material has the following elements by weight: 8% zinc, 0.2% tin, 0.05% boron, and the rest is aluminum, the content of a single impurity element is Fe≤0.25%, Si≤0.25%, and the total amount of other impurity elements≤ 0.15%.

[0023] A resistance heating melting furnace is used for smelting and alloying during preparation, an aluminum-boron master alloy (3% by weight of boron content) is used for adding boron, and pure metal is used for other additions. Aluminum ingots, zinc ingots and aluminum-boron alloys are stored in graphite crucibles. After they are completely melted, tin is added, fully stirred with graphite rods, left to stand and scum on the surface is skimmed for pouring. When pouring, it can be directly poured into the mold to be used as a cast anode rod, or it can be cast into a cylindrical billet first, and then extruded into a thin rod on an extruder, and then used as an extruded anode rod after cutting to length.

Embodiment 2

[0025] An aluminum alloy sacrificial anode material has the following elements by weight: 3% zinc, 0.05% tin, 0.09% boron, the rest is aluminum, the content of a single impurity element is Fe≤0.25%, Si≤0.25%, and the total amount of other impurity elements≤ 0.15%.

[0026] A resistance heating melting furnace is used for smelting and alloying during preparation, an aluminum-boron master alloy (3% by weight of boron content) is used for adding boron, and pure metal is used for other additions. Aluminum ingots, zinc ingots and aluminum-boron alloys are stored in graphite crucibles. After they are completely melted, tin is added, fully stirred with graphite rods, left to stand and scum on the surface is skimmed for pouring. When pouring, it can be directly poured into the mold to be used as a cast anode rod, or it can be cast into a cylindrical billet first, and then extruded into a thin rod on an extruder, and then used as an extruded anode rod after cutting to length.

Embodiment 3

[0028] An aluminum alloy sacrificial anode material has the following elements by weight: 10% zinc, 0.3% tin, 0.02% boron, the rest is aluminum, the content of a single impurity element is Fe≤0.25%, Si≤0.25%, and the total amount of other impurity elements≤ 0.15%.

[0029] A resistance heating melting furnace is used for smelting and alloying during preparation, an aluminum-boron master alloy (3% by weight of boron content) is used for adding boron, and pure metal is used for other additions. Aluminum ingots, zinc ingots and aluminum-boron alloys are stored in graphite crucibles. After they are completely melted, tin is added, fully stirred with graphite rods, left to stand and scum on the surface is skimmed for pouring. When pouring, it can be directly poured into the mold to be used as a cast anode rod, or it can be cast into a cylindrical billet first, and then extruded into a thin rod on an extruder, and then used as an extruded anode rod after cutting to length.

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Abstract

The invention relates to an aluminum alloy sacrificial anode for volumetric water heaters, which is mainly used for corrosion protection of volumetric electric water heaters, solar water heaters and metal inner tanks of air source heat pumps in tap water environments. Its main composition is aluminum as raw material, adding elemental zinc, and also adding elemental tin and boron. Elemental bismuth may further be added. The weight ratio of the added element zinc is 3-10%, and the weight ratio of further added elements is: 0.05-0.3% of tin, 0.02-0.09% of boron, and 0-0.12% of bismuth. The multi-element aluminum alloy material of the present invention solves a series of problems of insufficient driving voltage, low current efficiency, water quality pollution by dissolved products and short service life of current sacrificial anode materials.

Description

technical field [0001] The invention relates to an aluminum alloy sacrificial anode material, which is mainly used for corrosion protection of volumetric electric water heaters, solar water heaters and air source heat pump metal inner tanks in tap water environments. Background technique [0002] Metal corrosion in water environment is one of the main forms of damage to metal equipment and components. Applying cathodic protection to metal components is a widely used anti-corrosion measure at present. There are two types of cathodic protection: impressed current protection and sacrificial anode protection. The sacrificial anode protection method is more suitable for the protection of the tank of volumetric water heaters. The method is to use the protected metal (inner liner) component as the cathode, and the metal with a more negative potential than it as the sacrificial anode, connect them through wires, and place them in the same electrolyte (tap water) at the same time. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F13/14C22C21/10
Inventor 马志新韩莉侯德龙卢晓军
Owner 厦门火炬特种金属材料有限公司
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