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Magnesium alloy sacrificial anode containing Sm and Bi

A sacrificial anode and magnesium alloy technology, applied in the field of magnesium alloy sacrificial anode, can solve the problems of affecting the service life of anode materials, uneven consumption of anode materials, uneven organization, etc., to achieve easy automatic control, uniform dissolution consumption, and long service life Effect

Inactive Publication Date: 2017-04-26
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the composition design and preparation process, ordinary magnesium alloy anode materials (such as AZ63, etc.) tend to have coarse grains and uneven structures, and aluminum and magnesium form a network of Mg 17 Al 12 phase, it is easy to form a micro-battery with the magnesium matrix, which makes the consumption of the anode material uneven and affects the service life of the anode material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The magnesium alloy sacrificial anode containing Sm and Bi in this embodiment is composed of the following components in mass percentage: Al 6.1%, Sm 0.35%, Bi 0.10%, and the balance is Mg and unavoidable impurities. The total mass percentage of Si, Fe, Cu and Ni in the impurities is less than 0.2%.

[0017] The preparation method of the magnesium alloy sacrificial anode containing Sm and Bi of the present embodiment is: get raw material pure magnesium (Mg), pure aluminum (Al), magnesium-samarium (Mg-Sm) intermediate alloy, pure bismuth (Bi), adopt Corundum crucible, induction furnace smelting, magnesium liquid; in CO 2 +SF 6 Under gas protection, the magnesium liquid is heated to 720°C and poured into a steel mold, and cooled to obtain a magnesium alloy ingot.

Embodiment 2

[0019] The magnesium alloy sacrificial anode containing Sm and Bi in this embodiment is composed of the following components in mass percentage: Al 6.2%, Sm 0.40%, Bi 0.20%, and the balance is Mg and unavoidable impurities. The total mass percentage of Si, Fe, Cu and Ni in the impurities is less than 0.2%.

[0020] The preparation method of the magnesium alloy sacrificial anode containing Sm and Bi in this embodiment is the same as that in Embodiment 1.

Embodiment 3

[0022] The magnesium alloy sacrificial anode containing Sm and Bi in this embodiment is composed of the following components in mass percentage: Al 6.3%, Sm 0.30%, Bi 0.15%, and the balance is Mg and unavoidable impurities. The total mass percentage of Si, Fe, Cu and Ni in the impurities is less than 0.2%.

[0023] The preparation method of the magnesium alloy sacrificial anode containing Sm and Bi in this embodiment is the same as that in Embodiment 1.

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Abstract

The invention relates to a magnesium alloy sacrificial anode containing Sm and Bi. The magnesium alloy sacrificial anode containing Sm and Bi comprises, by mass, 6.1%-6.3% of Al, 0.30%-0.40% of Sm, 0.10%-0.20% of Bi, and the balance Mg and inevitable impurities. The magnesium alloy sacrificial anode is prepared by smelting and casting the raw materials of pure magnesium, pure aluminum, magnesium-samarium intermediate alloy and pure bismuth. According to the magnesium alloy sacrificial anode containing Sm and Bi, Sm and Bi are added for refining crystal grains and improving the structure, the uniformity of the structure is improved, and magnesium alloy sacrificial anode materials are made to be consumed evenly in corrosive environments accordingly; the magnesium alloy sacrificial anode has the characteristics that the preparation process is simple, dissolving and consumption are uniform, and the service life is long; and the magnesium alloy sacrificial anode is suitable for cathode protection in the corrosive environments such as soil, seawater and water heaters and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of magnesium-based sacrificial anodes, in particular to a magnesium alloy sacrificial anode containing Sm and Bi. Background technique [0002] In order to reduce the huge economic loss caused by the corrosion of metal materials, it is an effective method to use sacrificial anodes for cathodic protection. In this protection technique, the anode is gradually consumed by the flowing current, which is called a sacrificial anode. As a sacrificial anode material, the metal or alloy must meet the following conditions: the potential is negative enough to supply sufficient electrons to cause cathodic polarization of the protected metal device. Magnesium alloys are often used as sacrificial anode materials to protect the cathode materials of important equipment and devices from corrosion, so as to prolong the service life of cathode materials. However, due to the composition design and preparation process, ordinary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F13/14C22C23/02C22C1/03
CPCC22C1/03C22C23/02C23F13/14
Inventor 王莹李萍张东晓崔扬赵靓雯
Owner LUOYANG INST OF SCI & TECH