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Ca-containing magnesium alloy sacrificial anode and preparation method and application thereof

A sacrificial anode, magnesium alloy technology, applied in mechanical equipment and other directions, can solve the problems of magnesium alloy self-loss, material surface particle shedding, fast corrosion rate, etc., to achieve the effect of improving service life and safety

Pending Publication Date: 2022-02-01
WUHU MIDEA KITCHEN & BATH APPLIANCES MFG +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In cast magnesium alloy (AZ63B) and extruded magnesium alloy (AZ31B), the β phase (Mg 17 Al 12 phase) can form a self-corrosion cathode, and the β-phase distribution is uneven, which leads to the self-loss of the magnesium alloy and reduces the current efficiency of the magnesium alloy, so that when used as a sacrificial anode material, the magnesium alloy is not corrosion-resistant and the corrosion rate is fast
[0003] In addition, due to the Mg in cast magnesium alloy (AZ63B) and extruded magnesium alloy (AZ31B) 17 Al 12 The phase distribution is uneven. When used as a sacrificial anode material, not only the corrosion rate is too fast, but the surface corrosion rate may even be uneven, resulting in the apparent shedding of particles on the surface of the material, which may cause water pollution problems.

Method used

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  • Ca-containing magnesium alloy sacrificial anode and preparation method and application thereof
  • Ca-containing magnesium alloy sacrificial anode and preparation method and application thereof
  • Ca-containing magnesium alloy sacrificial anode and preparation method and application thereof

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preparation example Construction

[0071] Another aspect of the present invention provides a method for preparing a Ca-containing magnesium alloy sacrificial anode, comprising the following steps:

[0072] In the presence of a protective substance, Mg is melted, then Al, Zn and Ca are added, stirred, kept warm and left standing, and cooled to obtain the Ca-containing magnesium alloy sacrificial anode. The preparation method is simple, convenient to operate, easy to process and shape, and is suitable for industrial production.

[0073] According to some embodiments of the invention, the protective substance includes a protective gas and / or a covering agent. The protective substance is used to isolate the air, and the purpose is to prevent the oxidation or combustion of the metal during the preparation of the magnesium alloy sacrificial anode, especially the low ignition point of magnesium, which is easy to burn and needs protection.

[0074] According to some embodiments of the present invention, the protective...

Embodiment 1

[0104] A Ca-containing magnesium alloy sacrificial anode, by mass percentage, including Al 5.5%, Zn 3.5%, Mn0.2%, Ca 0.1%, Si<0.001%, Fe<0.001%, Cu<0.001%, Ni< 0.001%, Mg balance.

[0105] The preparation method of the magnesium alloy sacrificial anode comprises the following steps:

[0106] in CO 2and SF 6 In a protective gas atmosphere, in a heating furnace, use graphite crucible as a container to melt magnesium ingots, then add aluminum ingots, zinc ingots, magnesium-manganese master alloys and magnesium-calcium master alloys in sequence, stir to remove slag, and then keep warm at 720°C Stand still for 20 minutes, pour into a round rod mold and air cool to obtain a rod-shaped magnesium alloy sacrificial anode.

[0107] figure 2 It is a metallographic micrograph of the magnesium alloy sacrificial anode prepared in Example 1 of the present invention. figure 2 The small black area in the middle is the β phase (Mg 17 Al 12 phase), and the large off-white area is the α ...

Embodiment 2

[0117] A Ca-containing magnesium alloy sacrificial anode, by mass percentage, including Al 6.3%, Zn 2.5%, Mn0.4%, Ca 0.2%, Si<0.001%, Fe<0.001%, Cu<0.001%, Ni< 0.001%, Mg balance.

[0118] The preparation method of the magnesium alloy sacrificial anode comprises the following steps:

[0119] in CO 2 and SF 6 Under protective gas atmosphere, in a heating furnace, use graphite crucible as a container to melt magnesium ingots, then add aluminum ingots, zinc ingots, magnesium-manganese master alloys and magnesium-calcium master alloys in sequence, stir to remove slag, and then keep warm at 700 ° C Stand still for 40 minutes, pour into a round rod mold and air cool to obtain a rod-shaped magnesium alloy sacrificial anode.

[0120] The current efficiency, corrosion resistance, open circuit potential and closed circuit potential of the rod-shaped magnesium alloy sacrificial anode prepared in Example 2 were tested according to GB / T17848-1999. Before testing the closed-circuit pote...

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Abstract

The invention relates to the technical field of alloy materials, in particular to a Ca-containing magnesium alloy sacrificial anode and a preparation method and application thereof. The magnesium alloy sacrificial anode comprises a magnesium rod body made of a magnesium alloy material, and the magnesium alloy material comprises, by mass, 4.7%-7.4% of Al, 2.2%-3.9% of Zn and 0.004%-1.7% of Ca. According to the magnesium alloy sacrificial anode, the grain of the magnesium alloy is refined by adding a proper amount of Ca, the distribution of the Mg17Al12 phase in the structure is improved, the current efficiency of the magnesium alloy sacrificial anode is larger than or equal to 58%, for example, the current efficiency is 60.5-61.5%, and the problem that the corrosion rate is too high when an existing magnesium alloy material serves as a sacrificial anode material can be solved. In a water heater, the magnesium alloy sacrificial anode can effectively protect the inner container material of the water heater and is resistant to corrosion, no obvious particle falling phenomenon exists on the surface, the service life of the water heater is effectively prolonged, and the safety of the water heater is effectively improved.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a Ca-containing magnesium alloy sacrificial anode and a preparation method and application thereof. Background technique [0002] Magnesium alloy has extremely low electrochemical potential, low density and large capacitance, and is an ideal sacrificial anode material. The currently commonly used magnesium alloy sacrificial anodes are mainly cast magnesium alloy (AZ63B) and extruded magnesium alloy (AZ31B), and their current efficiencies are 55.7% and 50.0%, respectively. In cast magnesium alloy (AZ63B) and extruded magnesium alloy (AZ31B), the β phase (Mg 17 Al 12 phase) can form a self-corrosion cathode, and the distribution of the β phase is uneven, which leads to the self-loss of the magnesium alloy and reduces the current efficiency of the magnesium alloy. When used as a sacrificial anode material, the magnesium alloy is not corrosion-resistant and the corrosion ra...

Claims

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Application Information

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IPC IPC(8): C23F13/16C22C23/02C22C1/03F24H9/45
CPCC23F13/16C22C23/02C22C1/03
Inventor 辛森森王明
Owner WUHU MIDEA KITCHEN & BATH APPLIANCES MFG
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